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Surface-mediated iron on porous cobalt oxide with high energy state for efficient water oxidation electrocatalysis

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Green Energy & Environment 2022年第4期7卷 662-671页

作者： Jingsha Li Tao Hu Changhong Wang Chunxian Guo Institute of Materials Science and Devices Suzhou University of Science and TechnologySuzhou215011China

Surface engineering of active materials to generate desired energy state is critical to fabricate high-performance heterogeneous ***, its realization in a controllable level remains challenging. Using oxygen evolution reaction(OER) as a model reaction, we report a surface-mediated Fe deposition strategy to electronically tailor surface energy states of porous Co_(3)O_(4)(Fe-pCo_(3)O_(4)) for enhanced activity towards OER. The Fe-pCo_(3)O_(4) exhibits a low overpotential of 280 mV to reach an OER current density of 100 mA cm^(-2), and a fast-kinetic behavior with a low Tafel slop of 58.2 mV dec^(-1), outperforming Co_(3)O_(4)-based OER catalysts recently reported and also the noble IrO_(2). The engineered material retains 100% of its original activity after operating at an overpotential of 350 m V for 100 h. A combination of theoretical calculations and experimental results finds out that the surface doped Fe promotes a high energy state and desired coordination environment in the near surface region, which enables optimized OER intermediates binding and favorably changes the rate-determining step.

关键词： Surficial Fe doping Cobalt oxides High energy state water oxidation Oxygen evolution reactions

Boosting solar water oxidation activity of BiVO_(4) photoanode through an efficient in-situ selective surface cation exchange strategy

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Journal of Energy Chemistry 2022年第5期31卷 49-59页

作者： Kai Song Fang He Ergang Zhou Lin Wang Huilin Hou Weiyou Yang School of Materials Science and Engineering Tianjin UniversityTianjin 300350China Tianjin Key Laboratory of Composite and Functional Materials Tianjin UniversityTianjin 300350China Institute of Micro/Nano Materials and Devices Ningbo University of TechnologyNingbo 315211ZhejiangChina

The sluggish kinetics for water oxidation is recognized as one of the major problems for the unsatisfied photoelectrochemical(PEC) performance. Herein, we developed a feasible strategy based on in-situ selective surface cation exchange, for activating surface water oxidation reactivity toward boosted PEC water oxidation of BiVO_(4) photoanodes with fundamentally improved surface charge transfer. The asconstructed Co/BiVO_(4) photoanodes exhibit 2.6 times increase in photocurrent density with superior stability, in comparison to those of pristine counterpart. Moreover, the faradaic efficiency of as-fabricated photoanode can be up to ~ 95% at 1.23 V(vs. RHE). The unique selective replacement of Bi by Co on the surface could modify the electronic structure of BiVO_(4) with reduced energy barrier of the deprotonation of OH^(+) to O, thus favoring the overall excellent PEC performance of Co/BiVO_(4) photoanode.

关键词： Cation exchange BiVO4 Photoelectrochemical water oxidation

Surpassing electrocatalytic limit of earth-abundant Fe^(4+)embedded in N-doped graphene for(photo)electrocatalytic water oxidation

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Journal of Energy Chemistry 2021年第3期30卷 274-281页

作者： Wenjia Xue Feng Cheng Menglu Li Wenjian Hu Congping Wu Bing Wang Kuowei Liao ZhenTao Yu Yingfang Yao Wenjun Luo Zhigang Zou Eco-materials and Renewable Energy Research Center(ERERC) College of Engineering and Applied SciencesNanjing UniversityNanjing 210093JiangsuChina Key Laboratory for Advanced Technology in Environment Protection of Jiangsu Province Vancheng Institute of TechnologyYancheng 224051JiangsuChina Jiangsu Key Laboratory for Nano Technology National Laboratory of Solid State MicrostructvresDepartment of PhysicsNanjing UniversityNanjing 210093JiangsuChina Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093JiangsuChina Kunshan Innovation Institute of Nanjing University Suzhou 215347JiangsuChina School of Science and Engineering The Chinese University of Hong KongShenzhen2001 Longxiang BlvdLonggang DistrictShenzhen 518172GuangdongChina Macao Institute of Systems Engineering Macao University of Science and TechnologyMacao 999078China Huazhong University of Science and Technology Wuhan National Laboratory for OptoelectronicsWuhan 430074HubeiChina

Developing highly active,cost-effective,and environmental friendly oxygen evolution reaction(OER)electrocatalysts facilitates various(photo)electrochemical *** this work,Fe3N nanoparticles encapsulated into N-doped graphene nanoshells(Fe_(3)N@NG)as OER electrocatalysts in alkaline media were *** the experimental and theoretical comparison between Fe_(3) N@NG and Fe_(3)N/NG,specifically including in situ Mossbauer analyses,demonstrated that the NG nanoshells improved interfacial electron transfer process from Fe_(3)N to NG to form high-valence Fe^(4+)ions(Fe^(4+)@NG),thus modifying electronic properties of the outer NG shells and subsequently electron transfer from oxygen intermediate to NG nanoshells for OER catalytic ***,the NG nanoshells also protected Fe-based cores from forming OER inactive and insulated Fe_(2)O_(3),leading to high OER *** a result,the as-formed Fe^(4+)@NG shows one of the highest electrocatalytic efficiency among reported Fe-based OER electrocatalysts,which can as well highly improve the photoelectrochemical water oxidation when used as the cocatalysts for the Fe_(2)O_(3) nanoarray photoanode.

关键词： Fe(Ⅳ) Photoelectrochemistry water oxidation Oxygen evolution reaction

Unravelling the essential difference between TiO_(x) and AlO_(x) interface layers on Ta_(3)N_(5) photoanode for photoelectrochemical water oxidation

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Journal of Energy Chemistry 2022年第1期31卷 33-37,I0002页

作者： Yongle Zhao Huichen Xie Wenwen Shi Hong Wang Chenyi Shao Can Li State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian National Laboratory for Clean EnergyDalian 116023LiaoningChina University of Chinese Academy of Sciences Beijing 100049China

Tantalum nitride(Ta_(3)N_(5))is a very promising photoanode material due to its narrow band gap(2.1 eV)and suitable band alignment for solar water ***,it suffers from severe photocorrosion during water *** this work,it was found that surface passivation by AlO_(x) and TiO_(x) layers results in dramatically different PEC performance of Ta_(3)N_(5) photoanode for water *** mechanism study indicates that the negative charges on AlO_(x) can generate additional field to promote separation of photogenerated charges,while the positive charges on TiO_(x) layer show the opposite *** a result,the Ta_(3)N_(5) based photoanode modified with AlO_(x) layer gives a high photocurrent of 12.5 mA cm^(-2) for 24 h at 1.23 V versus the reversible hydrogen electrode(RHE).Dynamic analysis implies that the hole extraction and transfer are significantly improved by the modification with the AlO_(x) *** work reveals the importance of the charges on surface passivation layer in interface engineering of photoelectrodes.

关键词： Photoelectrochemistry Tantalum nitride Interface layer water oxidation

Nickel-carbonate nanowire array： An efficient and durable electrocatalyst for water oxidation under nearly neutral conditions

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Frontiers of Chemical Science and Engineering 2018年第3期12卷 467-472页

作者： Yuyao Ji Min Ma Xuqiang Ji Xiaoli Xiong Xuping Sun College of Chemistry and Materials Science Sichuan Normal University Chengdu 610068 China College of Chemistry Sichuan University Chengdu 610064 China Key Lab of Process Analysis and Cont ol of Sichuan Universities Yibin University Yibin 644000 China

It is highly attractive but still remains a great challenge to develop an efficient electrocatalyst for oxygen evolution reaction under nearly neutral conditions. In this work, we report the transformation of Ni3S2 nanowire array on nickel foam into the amorphous nickel carbonate nanowire array on nickel foam （NiCO3/NF）. The resulting NiCO3/NF shows high electrocatalytic activity towards water oxidation and affords current density of 50 mA. cm-2 at overpotential of 395 mV in 1.0 mol·L^-1 KHCO3. Moreover, this NiCO3/NF is also durable with a long-term electrochemical durability of 60 h. This catalyst electrode achieves a high turnover frequency of 0.21 mol O2·s^-1 at the overpotential of 500 mV.

关键词： water oxidation NiCO3/NF nearly neutral conditions superior activity electocatalyst

Ta_(3)N_(5)–LaTaON_(2) heterojunction with matched interfaces to accelerate charge separation for efficient photocatalytic water oxidation

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Journal of Materials Science & Technology 2023年第23期154卷 241-250页

作者： Guoan Lin Chi Zhang Xiaoxiang Xu Clinical and Central Lab Putuo People's Hospital Tongji University Shanghai 200060 China Shanghai Key Lab of Chemical Assessment and Sustainability School of Chemical Science and Engineering Tongji University Shanghai 200092 China

Charge separation is generally considered as the most critical step to achieve efficient photocatalytic reactions. Although charge separation can be promoted by a semiconductor heterojunction, its efficacy is inherently restrained by the mismatched atomic arrangements across the heterojunction interfaces. Here, Ta3N5–LaTaON2 heterojunction with matched interfaces has been fabricated by one-step ammonolysis treatment of KLaTa2O7. The match interfaces are formed by nearly perfect adhesion of Ta3N5 (010) and LaTaON2 (101¯) facets whose interatomic distance is similar. Compared with conventional heterojunction, the so-formed Ta3N5–LaTaON2 heterojunction are extremely efficient in accelerating charge separation which in turn enables a high photocatalytic activity. An apparent quantum efficiency as high as 11.6% at 420 ± 20 nm has been reached by Ta_(3)N_(5)–LaTaON_(2) heterojunction, which is almost three times higher than Ta_(3)N_(5)-LaTaON_(2) mixtures. These results signify the importance of matched heterojunction interfaces for charge separation and provide a paradigm in the design of efficient heterojunction-based semiconductor photocatalysts.

关键词： Semiconductor heterojunction LaTaON_(2) Ta_(3)N_(5) Photocatalyst water oxidation

FeNiS_(2)/reduced graphene oxide electrocatalysis with reconstruction to generate FeNi oxo/hydroxide as a highly-efficient water oxidation electrocatalyst

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Rare Metals 2022年第12期41卷 4127-4137页

作者： Xiao-Zhen Ren Xue-Hui Li Yu-Jie Peng Guan-Zhi Wang Jie Yin Xing-Chuan Zhao Wei Wang Xiao-Bai Wang School of Materials Science and Engineering Liaocheng UniversityLiaocheng 252000China School of Metallurgy and Chemistry Engineering Jiangxi University of Science and TechnologyGanzhou 341000China Department of Materials Application Research AVIC Manufacturing Technology InstituteBeijing 100024China

It is critical to developing electrocatalysts with highly active and cost-effective for oxygen evolution to resolve environmental pollution and energy issues,in which FeNi-based nanomaterials hold a great ***,(Fe_(0.33 )Ni_(0.67))S_(2) and(Fe_(0.33 )Ni_(0.67))S_(2)/reduced graphene oxide(rGO)-x%(x=10,20) composites,which exhibited highly efficient oxygen evolution reaction(OER)electrocatalytic activity under alkaline conditions,were synthesized via a hydrothermal approach and following thermal treatment with sulfur *** from the integrated structure of(Fe_(0.33 )Ni_(0.67))S_(2)and support of conductive graphene backbones,(Fe_(0.33 )Ni_(0.67))S_(2)/rGO-20%electrocatalyst showed the best OER activity with an overpotential of 172 mV at 10 mA·cm^(-2)and Tafel slopes of 45 mV·decade^(-1).The composition,phase,and surface structure of the catalyst were characterized before and after OER *** results indicated that crystal phase of the catalyst was reconstructed to the amorphous crystalline features after OER,with oxidation of iron-nickel sulfide and appearance of Ni-Fe oxo/hydroxide species,which may play a crucial role in the high OER performance as the ***,in a two-electrode system towards overall water splitting with(Fe_(0.33 )Ni_(0.67))S_(2)/rGO-20%/NF and Pt/C/NF as the anode and cathode,respectively,the catalysts exhibited excellent catalytic performance with the voltage of only 1.42 V at 10 mA·cm^(-2).

关键词： Ternary nickel-iron sulfide Reduced graphene oxide(rGO) Electrocatalysts water oxidation Self-reconstruction

Corrosion formation and phase transformation of nickel-iron hydroxide nanosheets array for efficient water oxidation

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Nano Research 2021年第12期14卷 4528-4533页

作者： Lanqian Gong Huan Yang Hongming Wang Ruijuan Qi Junlei Wang Shenghua Chen Bo You Zehua Dong Hongfang Liu Bao Yu Xia Key laboratory of Material Chemistry for Energy Conversion and Storage(Ministry of Education) Hubei Key Laboratory of Material Chemistry and Service FailureWuhan National Laboratory for OptoelectronicsSchool of Chemistry and Chemical EngineeringHuazhong University of Science and Technology(HUST)Wuhan430074China School of Materials Science and Engineering Wuhan Institute of TechnologyWuhan430074China Institute for Advanced Study Nanchang UniversityNanchang330000China Department of Information Science and Technology East China Normal UniversityShanghai200240China

Designing earth-abundant electrocatalysts with high performance towards water oxidation is highly decisive for the sustainable energy technologies. This study develops a facile natural corrosion approach to fabricate nickel-iron hydroxides for water oxidation. The resulted electrode demonstrates an outstanding activity and stability with an overpotential of 275 mV to deliver 10 mA·cm^(−2). Experimental and theoretical results suggest the corrosion-induced formation of hydroxides and their transformation to oxyhydroxides would account for this excellent performance. This work not only provides an interesting corrosion approach for the fabrication of excellent water oxidation electrode, but also bridges traditional corrosion engineering and novel materials fabrication, which would offer some insights in the innovative principles for nanomaterials and energy technologies.

关键词： water oxidation electrocatalyst corrosion hydroxide phase transformation

Deciphering of advantageous electrocatalytic water oxidation behavior of metal-organic framework in alkaline media

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Nano Research 2021年第12期14卷 4680-4688页

作者： Ming Liu Lingjun Kong Xuemin Wang Jie He Jijie Zhang Jian Zhu Xian-He Bu School of Materials Science and Engineering National Institute for Advanced MaterialsTKL of Metal and Molecule Based Material ChemistryNankai UniversityTianjin300350China Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) College of ChemistryNankai UniversityTianjin300071China

Carboxylic acid-based metal-organic frameworks(MOFs)are normally passed for the“pre-catalysts”for oxygen evolution reaction(OER)due to the hydroxides constructed in-situ during its alkaline hydrolysis process(AHP)in ***,it remains a mystery that they show advantageous activity over prototypical hydroxides when they are directly acted as OER ***,we propose for the first time that the steric hindrance effect of Nafion can induce enhanced catalytic activity of such *** from conventional catalysts without AHP,the Nafion with 3D structure weakens the AHP of Co-MOF nanoribbons,thus forming small size and low crystallinity species(cobalt hydroxide)with more active *** the existence of Nafion also optimizes its electronic structure,which is confirmed by transmission electron microscopy(TEM),in-situ UV absorption spectra,in-situ Raman spectroscopy and so *** with Co-MOF-K obtained by directly immersing the Co-MOF nanoribbons in 1.0 M KOH,the Co-MOF-NK obtained by AHP of Co-MOF mixed with Nafion shows better catalytic *** on the above inspiration,we realized the low overpotential of 268 mV at 10 mA·cm^(−2) by preparing *** work provides a new understanding of the structural reconstruction of MOFs in the field of electrocatalysis.

关键词： metal-organic frameworks structural reconstruction Nafion stereo hindrance water oxidation