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Oxygen-deficient MoO_(x)/Ni_(3)S_(2) heterostructure grown on nickel foam as efficient and durable self-supported electrocatalysts for hydrogen evolution reaction

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Frontiers of Chemical Science and Engineering 2023年第4期17卷 437-448页

作者： Zihuan Yu Haiqing Yan Chaonan Wang Zheng Wang Huiqin Yao Rong Liu Cheng Li Shulan Ma Beijing Key Laboratory of Energy Conversion and Storage Materials College of ChemistryBeijing Normal UniversityBeijing 100875China School of Basic Medical Sciences Ningxia Medical UniversityYinchuan 750004China Analytical and Testing Center Beijing Normal UniversityBeijing 100875China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China

High-performance and ultra-durable electrocatalysts are vital for hydrogen evolution reaction(HER)during water ***,by one-pot solvothermal method,MoO_(x)/Ni_(3)S_(2) spheres comprising Ni_(3)S_(2) nanoparticles inside and oxygen-deficient amorphous MoO_(x) outside in situ grow on Ni foam(NF),to assembly the heterostructure composites of MoO_(x)/Ni_(3)S_(2)/*** adjusting volume ratio of the solvents of ethanol to water,the optimized MoO_(x)/Ni_(3)S_(2)/NF-11 exhibits the best HER performance,requiring an extremely low overpotential of 76 mV to achieve the current density of 10 mA∙cm‒2(η_(10)=76 mV)and an ultra-small Tafel slope of 46 mV∙dec^(-1) in 0.5 mol∙L^(-1) H_(2)SO_(4).More importantly,the catalyst shows prominent high catalytic stability for HER(>100 h).The acid-resistant MoO_(x) wraps the inside Ni_(3)S_(2)/NF to ensure the high stability of the catalyst under acidic *** functional theory calculations confirm that the existing oxygen vacancy and MoO_(x)/Ni_(3)S_(2) heterostructure are both beneficial to the reduced Gibbs free energy of hydrogen adsorption(|∆G_(H*)|)over Mo sites,which act as main active *** heterostructure effectively decreases the formation energy of O vacancy,leading to surface reconstruction of the catalyst,further improving HER *** MoO_(x)/Ni_(3)S_(2)/NF is promising to serve as a highly effective and durable electrocatalyst toward HER.

关键词： molybdenum oxides oxygen vacancies heterostructure electrocatalysts hydrogen evolution reaction

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Dual-functional MnS_(2)/MnO_(2) heterostructure catalyst for efficient acidic hydrogen evolution reaction and assisted degradation of organic wastewater

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Journal of Energy Chemistry 2023年第12期87卷 215-224,I0007页

作者： Wen Kang Zhao Zi Qiang Ma Jia Yu Zheng Chang Bao Han Kai Ling Zhou Ming Yang Hao De Cai Fang Yi Xia Hui Yan The Key Laboratory of Advanced Functional Materials Ministry of Education of ChinaFaculty of Materials and ManufacturingBeijing University of TechnologyBeijing 100124China

The design and synthesis of non-precious metal dual-functional electrocatalysts through the modulation of electronic structure are important for the development of renewable hydrogen ***,MnS_(2)/MnO_(2)-CC heterostructure dual-functional catalysts with ultrathin nanosheets were prepared by a twostep electrodeposition method for efficient acidic hydrogen evolution reaction(HER) and degradation of organic wastewater(such as methylene blue(MB)).The electronic structure of Mn atoms at the MnS_(2)/MnO_(2)-CC heterostructure interface is reconfigured under the joint action of S and O *** calculations show that the Mn d-band electron distribution in MnS_(2)/MnO_(2)-CC catalyst has higher occupied states near the Fermi level compared to the MnO_(2) and MnS_(2) catalysts,which indicates that MnS_(2)/MnO_(2)-CC catalyst has better electron transfer capability and catalytic *** MnS_(2)/MnO_(2)-CC catalysts require overpotential of only 66 and 116 mV to reach current density of 10 and 100 mA cm^(-2)in MB/H_(2)SO_(4) *** MnS_(2)/MnO_(2)-CC catalyst also has a low Tafel slope(26.72 mV dec^(-1)) and excellent stability(the performance does not decay after 20 h of testing).In addition,the MB removal efficiency of the MnS_(2)/MnO_(2)-CC catalyst with a better kinetic rate(0.0226) can reach 97.76%,which is much higher than that of the MnO_(x)-CC catalyst(72.10%).This strategy provides a new way to develop efficient and stable non-precious metal dual-functional electrocatalysts for HER and organic wastewater degradation.

关键词： Hydrogen evolution reaction(HER) Dual-functional electrocatalysts heterostructure Catalytic activity Degradation of organic wastewater

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Anomalous enhancement oxidation of few-layer MoS_(2)and MoS_(2)/h-BN heterostructure

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Nano Research 2022年第8期15卷 7081-7090页

作者： Siming Ren Yanbin Shi Chaozhi Zhang Mingjun Cui Jibin Pu Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective TechnologiesNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China Key Laboratory of Impact and Safety Engineering Ministry of Education of ChinaSchool of Mechanical Engineering and MechanicsNingbo UniversityNingbo 315211China

Because of profound applications of two-dimensional molybdenum disulfide(MoS_(2))and its heterostructures in electronics,its thermal stability has been spurred substantial *** employ a precision muffle furnace at a series of increasing temperatures up to 340℃to study the oxidation behavior of continuous MoS_(2)films by either directly growing mono-and fewlayer MoS_(2)on SiO_(2)/Si substrate,or by mechanically transferring monolayer MoS_(2)or hexagonal boron nitride(h-BN)onto monolayer MoS_(2)*** show that monolayer MoS_(2)can withstand high temperature at 340℃with less oxidation while the few-layer MoS_(2)films are completely oxidized just at 280℃,resulting from the growth-induced tensile strain in few-layer MoS_(2).When the tensile strain of films is released by transfer method,the stacked few-layer MoS_(2)films exhibit superior thermal stability and typical layer-by-layer oxidation behavior at similarly high ***,for the MoS_(2)/h-BN heterostructure,the h-BN film itself stacked on top is not damaged and forms many bubbles at 340℃,whereas the underlying monolayer MoS_(2)film is oxidized *** comprehensively using various experimental characterization and molecular dynamics calculations,such anomalous oxidation behavior of MoS_(2)/h-BN heterostructure is mainly due to the increased tensile strain in MoS_(2)film at elevated temperature.

关键词： molybdenum disulfide hexagonal boron nitride heterostructure enhancement oxidation tensile strain

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MoSe_(2)/TiO_(2)heterostructure integrated in N-doped carbon nanosheets assembled porous core-shell microspheres for enhanced sodium storage

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Nano Research 2023年第7期16卷 9398-9406页

作者： Nianxiang Shi Guangzeng Liu Baojuan Xi Xuguang An Changhui Sun Xinzheng Liu Shenglin Xiong School of Chemistry and Chemistry Engineering Qilu Normal UniversityJinan 250200China School of Chemistry and Chemical Engineering and State Key Laboratory of Crystal MaterialsShandong UniversityJinan 250100China School of Mechanical Engineering Chengdu UniversityChengdu 610106China

Engineering the structure and composition of electrode materials is one of the essential means for achieving excellent electrochemical *** rational design of Na+host materials is still a massive challenge for sodium ion batteries(SIBs).Herein,MoSe_(2)/TiO_(2)heterostructure is integrated with N-doped carbon nanosheets to assemble into hierarchical flowerlike porous core-shell microspheres(MoSe_(2)/TiO_(2)@N-C),which is firstly reported by room-temperature stirring coupled with vulcanization *** cavity of the core-shell structure could provide enough storage space for Na+and alleviate the volume expansion during charge/discharge *** apertures between nanosheets provide a guarantee for the rapid penetration of electrolyte to enhance the utilization rate of electrode ***,building heterostructures by combining different phase structures can facilitate electron transfer and accelerate reaction *** from the synergistic contributions of structure and composition,MoSe_(2)/TiO_(2)@N-C as SIBs anode material shows better reversible capacities of 302.5 mAh·g^(-1)at 1 A·g^(-1)for 400 cycles and 217.4 mAh·g^(-1)at 4 A·g^(-1)for 900 ***,the reversible capacities can be restored entirely to the initial level after a high current density cycle.

关键词： MoSe_(2)/TiO_(2) flower-like hierarchical porous core-shell microspheres heterostructure sodium ion batteries

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Borophene–graphene heterostructure: Preparation and ultrasensitive humidity sensing

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Nano Research 2021年第7期14卷 2337-2344页

作者： Chuang Hou Guo'an Tai Bo Liu Zenghui Wu Yonghe Yin The State Key Laboratory of Mechanics and Control of Mechanical Structures and Laboratory of Intelligent Nano Materials and Devices of Ministry of Education College of Aerospace EngineeringNanjing University of Aeronautics and AstronauticsNanjing 210016China

heterostructure has triggered a surge of interest due to its synergistic effects between two different layers,which contributes to desirable physical properties for extensive potential *** stable borophene is becoming a promising candidate for constructing two-dimensional(2D)heterostructures,but it is rarely prepared by suitable synthesis conditions ***,we demonstrate that a novel heterostructure composed of hydrogenated borophene and graphene can be prepared by heating the mixture of sodium borohydride and few-layered graphene followed by stepwise and in situ thermal decomposition of sodium borohydride under high-purity hydrogen as the carrier *** fabricated borophene–graphene heterostructure humidity sensor shows ultrahigh sensitivity,fast response,and long-time *** sensitivity of the fabricated borophene-based sensor is near 700 times higher than that of pristine graphene one at the relative humidity of 85%*** sensitivity of the sensor is highest among all the reported chemiresistive sensors based on 2D ***,the performance of the borophene–graphene flexible sensor maintains good stability after bending,which shows that the borophene-based heterostructures can be applied in wearable *** observed high performance can be ascribed to the well-established charge transfer mechanism upon H2O molecule *** study further promotes the fundamental studies of interfacial effects and interactions between boron-based 2D heterostructures and chemical species.

关键词： borophene graphene heterostructure humidity sensor two-dimensional materials

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Thermally induced band hybridization in bilayer-bilayer MoS2/WS2 heterostructure

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Chinese Physics B 2021年第5期30卷 170-175页

作者： Yanchong Zhao Tao Bo Luojun Du Jinpeng Tian Xiaomei Li Kenji Watanabe Takashi Taniguchi Rong Yang Dongxia Shi Sheng Meng Wei Yang and Guangyu Zhang Beijing National Laboratory for Condensed Matter Physics Key Laboratory for Nanoscale Physics and DevicesInstitute of PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100190China Songshan Lake Materials Laboratory Dongguan 523808China Department of Electronics and Nanoengineering Aalto UniversityTietotie 3FI-02150Finland Research Center for Functional Materials National Institute for Materials Science1-1 NamikiTsukuba 305-0044Japan International Center for Materials Nanoarchitectonics National Institute for Materials Science1-1 NamikiTsukuba 305-0044Japan Beijing Key Laboratory for Nanomaterials and Nanodevices Beijing 100190China

Transition metal dichalcogenides(TMDs),being valley selectively,are an ideal system hosting *** TMDs together to form heterostructure offers an exciting platform to engineer new optical and electronic properties in solid-state ***,due to the limited accuracy and repetitiveness of sample preparation,the effects of interlayer coupling on the electronic and excitonic properties have not been systematically *** this report,we study the photoluminescence spectra of bilayer-bilayer MoS_(2)/WS_(2) heterostructure with a typeⅡband *** demonstrate that thermal annealing can increase interlayer coupling in the van der Waals heterostructures,and after thermally induced band hybridization such heterostructure behaves more like an artificial new solid,rather than just the combination of two individual TMD *** also carry out experimental and theoretical studies of the electric controllable direct and indirect infrared interlayer excitons in such *** study reveals the impact of interlayer coupling on interlayer excitons and will shed light on the understanding and engineering of layer-controlled spin-valley configuration in twisted van der Waals heterostructures.

关键词： two-dimensional materials transition metal dichalcogenides(TMDs) heterostructure band hybridization interlayer exciton

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Superior material qualities and transport properties of InGaN channel heterostructure grown by pulsed metal organic chemical vapor deposition

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Chinese Physics B 2016年第1期25卷 796-801页

作者：张雅超周小伟许晟瑞陈大正王之哲汪星张金风张进成郝跃 State Key Discipline Laboratory of Wide Band Gap Semiconductor Technology School of Microelectronics Xidian University

Pulsed metal organic chemical vapor deposition is introduced into the growth of InGaN channel heterostructure for improving material qualities and transport properties. High-resolution transmission electron microscopy imaging shows the phase separation free InGaN channel with smooth and abrupt interface. A very high two-dimensional electron gas density of approximately 1.85 x 10^13 cm-2 is obtained due to the superior carrier confinement. In addition, the Hall mobility reaches 967 cruZ/V-s, owing to the suppression of interface roughness scattering. Furthermore, temperature-dependent Hall measurement results show that InGaN channel heterostructure possesses a steady two-dimensional electron gas density over the tested temperature range, and has superior transport properties at elevated temperatures compared with the traditional GaN channel heterostructure. The gratifying results imply that InGaN channel heterostructure grown by pulsed metal organic chemical vapor deposition is a promising candidate for microwave power devices.

关键词： heterostructure InGaN channel pulsed metal organic chemical vapor deposition

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Binary-ternary transition metal chalcogenides interlayer coupling in van der Waals type-II heterostructure for visible-infrared photodetector with efficient suppression dark currents

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Nano Research 2022年第3期15卷 2689-2696页

作者： Guoliang Xu Danmin Liu Songyu Li Yi Wu Zhenlu Zhang Shaobo Wang Zikun Huang Yongzhe Zhang Key Laboratory of Advanced Functional Materials Ministry of EducationFaculty of Materials and ManufacturingBeijing University of TechnologyBeijing 100124China School of Physics and Nuclear Energy Engineering Beihang UniversityBeijing 100083China School of Science Beijing University of Posts and TelecommunicationsBeijing 100876China Key Laboratory of Optoelectronics Technology Ministry of EducationFaculty of Information TechnologyBeijing University of TechnologyBeijing 100124China

Ternary two-dimentional(2D)materials exhibit diverse physical properties depending on their composition,structure,and *** forming heterostructures with other binary materials that show similar structure,there can be numerous potential applications of these ternary 2D *** this work,we reported the structure of few-layer CrPS_(4)by X-ray diffraction,transmission electron microscope,and electron-density distribution *** also demonstrated a new application of the CrPS_(4)/MoS_(2)heterobilayer:visible-infrared photodetectors with type-II staggered band alignment at room *** response of the heterostructure to infrared light results from a strong interlayer coupling that reduces the energy interval in the junction *** the intrinsic bandgap of individual components determines wavelengths,the decrease in energy interval allows better detection of light that has a longer *** used photoluminescence(PL)spectroscopy,Kelvin probe force microscopy(KPFM)under illumination,and electrical transport measurements to verify the photoinduced charge separation between the CrPS_(4)/MoS_(2)*** forward bias,the device functioned as a highly sensitive photodetector,as the wavelength-dependent photocurrent measurement achieved the observation of optical excitation from 532 to 1,450 nm ***,the photocurrent caused by interlayer exciton reached around 1.2 nA at 1,095 nm *** demonstration of the strong interlayer coupling in the CrPS_(4)/MoS_(2)heterostructure may further the understanding of the essential physics behind binary-ternary transition metal chalcogenides heterostructure and pave a way for their potential applications in visible-infrared devices.

关键词： heterostructure MoS_(2) CrPS_(4) interlayer transition visible-infrared photodetector type-II band alignment

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Interfacial active sites on Co-Co_(2)C@carbon heterostructure for enhanced catalytic hydrogen generation

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Rare Metals 2023年第6期42卷 1935-1945页

作者： Huan-Huan Zhang Yang-Bin Ren Zhen-Luo Yuan Nai-Xin Kang Sehrish Mehdi Cong-Cong Xing Xian-Yun Liu Yan-Ping Fan Bao-Jun Li Bao-Zhong Liu College of Chemistry and Chemical Engineering Henan Polytechnic UniversityJiaozuo454003China ISM UMR CNRS No 5255Univ.BordeauxTalence Cedex33405France Department of Chemistry The Women University MultanKutchery CampusMultan66000Pakistan Department of Materials Science and Engineering Pennsylvania State UniversityUniversity ParkPA16802USA Research Center of Green Catalysis College of ChemistryZhengzhou UniversityZhengzhou450001China Henan Key Laboratory of Coal Green Conversion Henan Polytechnic UniversityJiaozuo454003China

Designing catalysts with capable dual-active sites to drive catalytic hydrogen generation is necessary for the future hydrogen ***,the interfacial active sites consisting of Co and Co-C on Co-Co_(2)C@carbon heterostructure are designed through annealing and highpressure *** operating temperature during the high-pressure carbonization under a CO-reducing environment is responsible for the construction and regulation of Co-Co_(2)C@C *** optimal catalyst has a high turnover frequency(TOF) of33.1 min^(-1) and low activation energy(E_a) of27.3 kJ-mol^(-1) during the hydrolysis of NH_(3)BH_(3).The catalytic stability of Co-Co_(2)C@C has no dramatic deterioration even after 5 cyclic *** interfacial active sites and the carbon on the catalyst surface enhance hydrogen generation kinetics and catalytic *** construction of interfacial active sites in Co-Co_(2)C@C prompts the dissociation of reactants(NH_(3)BH_(3) and H_(2)O molecules),leading to an enhanced catalytic hydrogen generation from NH_(3)BH_(3) hydrolysis(Co activates NH_(3)BH_(3) and Co-C activates H_(2)O).The construction of hetero-structural catalysts provides theoretical direction for the rational design of advanced transition metal carbide materials in the field of energy catalysis and conversion.

关键词： Interfacial active sites Bimolecular activation heterostructure Hydrogen generation Catalytic mechanism

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Engineering Cu_(1.96)S/Co_(9)S_(8) with sulfur vacancy and heterostructure as an efficient bifunctional electrocatalyst for water splitting

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Journal of Materials Science & Technology 2023年第23期154卷 1-8页

作者： Yuanhua Xiao Ya Shen Dangcheng Su Shiwei Zhang Jinlin Yang Dafeng Yan Shaoming Fang Xuezhao Wang Key Laboratory of Surface & Interface Science and Technology/College of Material and Chemical Engineering Zhengzhou University of Light Industry Zhengzhou 450002 China Department of Chemistry National University of Singapore 3 Science Drive 3 Singapore 117543 Singapore College of Chemistry and Chemical Engineering Hubei University Wuhan 430062 China College of Chemical and Food Zhengzhou University of Technology Zhengzhou 450044 China

Defect and interface engineering have been recognized as efficient strategies for developing high-performance ***,it is still challenging to couple defect and interface engineering in transition metal sulfides and understand their dynamic evolution process during ***,we developed one-step pyrolysis of bimetallic sulfide to construct S vacancy-rich Cu_(1.96)S/Co_(9)S_(8) heterostructure by controlling the critical decomposition *** as-synthesized Cu_(1.96)S/Co_(9)S_(8) exhibits excellent bifunctional electrocatalytic performance,with a low overpotential of 99 and 200 mV at 10 mA cm−2 towards hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)in 1.0 mol/L KOH electrolyte,respectively.A symmetric two-electrode cell with Cu_(1.96)S/Co_(9)S_(8) delivered a current density of 10 mA cm^(−2) at a low voltage of 1.43 V and showed long-term stability for 200 h.A series of in/ex-situ techniques revealed that the electrochemical reconfiguration only appeared in the OER process,resulting in the CoOOH/CuO and SO42−species promoting OER ***,the S vacancy and heterostructure interface in Cu_(1.96)S/Co_(9)S_(8) were proved to optimize the electronic structure and the adsorption of intermediates for HER by density function theory(DFT)*** work provides a promising strategy to construct metal sulfides with rich defects and heterogeneous interfaces and understand their dynamic evolution process for electrochemical storage and conversion devices.

关键词： Cu_(1.96)S/Co_(9)S_(8) S vacancy heterostructure Overall water-splitting

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