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Photoelectrocatalytic hydrogen evolution and synchronous degradation of organic pollutants by pg-C_(3)N_(4)/β-FeOOH S-scheme heterojunction

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Science China(Technological Sciences) 2024年第4期67卷 1238-1252页

作者： LI XiBao HAN Tao ZHOU YingTang XIE Yu LUO YiDan huang juntong CHEN Zhi DENG Fang School of Materials Science and Engineering Nanchang Hangkong UniversityNanchang 330063China National-Local Joint Engineering Research Center of Heavy Metal Pollutants Control and Resource Utilization Nanchang Hangkong UniversityNanchang 330063China Zhejiang Key Laboratory of Petrochemical Environmental Pollution Control National Engineering Research Center for Marine AquacultureMarine Science and Technology CollegeZhejiang Ocean UniversityZhoushan 316022China

Crafting photoelectrocatalytic materials with robust oxidation-reduction properties for simultaneous hydrogen evolution and pollutant degradation poses a formidable *** this study,a pg-C_(3)N_(4)/β-FeOOH S-scheme heterostructure with a special energy band structure was developed by anchoring porous pg-C_(3)N_(4)on needle shapedβ-*** as a hole extraction layer,needle-leaf-likeβ-FeOOH can facilitate efficient hole migration and enhance charge ***,the optimized 0.2-pg-C_(3)N_(4)/β-FeOOH could degrade 78%of ofloxacin(OFLO)in 90 *** organic pollutants could absorb a large number of holes,which prompted a greater proportion of photogenerated electrons to actively participate in the hydrogen evolution reaction at the ***,the hydrogen production of 0.2-pg-C_(3)N_(4)/β-FeOOH reached 1452.88μmol cm^(-2)h^(-1),exhibiting a notable increase of 61.81-165.12μmol cm^(-2)h^(-1)compared with that in the absence of *** and theoretical calculation results underscore that this investigation is grounded in a distinctive electron and hole dual channel transfer *** findings offer novel insights for the future development of S-scheme heterojunction photoelectrocatalytic materials capable of concurrently degrading pollutants and promoting hydrogen evolution.

关键词： photoelectrocatalysis hydrogen evolution degradation synchronous S-scheme heterojunction

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A facile strategy for large-scale production of 2D nanosheets exfoliated by three-roll milling

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Journal of Advanced Ceramics 2024年第1期13卷 11-18页

作者： Xin Wang Yang Xia juntong huang Yao Su Zhi Chen Linlin Chen Zhaohui Wu Zhijun Feng Huiyong Yang Xibao Li School of Materials Science and Engineering Nanchang Hangkong UniversityNanchang 330063China

Two-dimensional(2D)nanomaterials,such as graphene,MoS_(2),and MAX,have attracted increasing research attention in recent years due to their unique structural and performance ***,their complex production processes and equipment requirements are significant issues affecting their widespread ***,with an exfoliation strategy using three-roll milling,we present a simple,cost-effective,and extensible method to produce multilayer graphene,BN,MoS_(2),and Ti_(3)AlC_(2) *** roller and phenolic resin created three kinds of forces on the layered 2D materials,i.e.,shear forces,compressive forces,and adhesive forces,which exfoliated layered materials from their edges and surfaces into ***,the exfoliated materials were ultrasonically washed with alcohol,treated with ultrasonic vibration,and centrifuged to obtain 2D *** easy operation and high yield are attractive for research based on the construction of high-performance 2D nanosheet-based devices at low ***,the obtained multilayer graphene and MoS_(2) nanosheets were used as anode materials of sodium/potassium-ion batteries,respectively,to test their electrochemical *** performances are obtained compared with their primary bulk materials.

关键词： two-dimensional(2D)nanosheets exfoliation three-roll milling(TRM) sodium/potassium-ion batteries

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Experimental and DFT studies of flower-like Ni-doped Mo_(2)C on carbon fiber paper:A highly efficient and robust HER electrocatalyst modulated by Ni(NO_(3))_(2)concentration

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Journal of Advanced Ceramics 2022年第8期11卷 1294-1306页

作者： Lei ZHANG Zhihui HU juntong huang Zhi CHEN Xibao LIa Zhijun FENG Huiyong YANG Saifang huang Ruiying LUO School of Materials Science and Engineering Nanchang Hangkong UniversityNanchang 330063China School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China Research Institute for Frontier Science Beihang UniversityBeijing 100191China

Developing highly efficient and stable non-precious metal catalysts for water splitting is urgently *** this work,we report a facile one-step molten salt method for the preparation of self-supporting Ni-doped Mo_(2)C on carbon fiber paper(Ni–Mo_(2)CCB/CFP)for hydrogen evolution reaction(HER).The effects of nickel nitrate concentration on the phase composition,morphology,and electrocatalytic HER performance of Ni-doped Mo_(2)C@CFP electrocatalysts was *** the continuous increase of Ni(NO_(3))_(2)concentration,the morphology of Mo_(2)C gradually changes from granular to flower-like,providing larger specific surface area and more active *** nickel(Ni)into the crystal lattice of Mo_(2)C largely reduces the impedance of the electrocatalysts and enhances their electrocatalytic *** as-developed Mo_(2)C–3 M Ni(NO_(3))_(2)/CFP electrocatalyst exhibits high catalytic activity with a small overpotential of 56 mV at a current density of 10 mA·cm^(-2).This catalyst has a fast HER kinetics,as demonstrated by a very small Tafel slope of 27.4 mV·dec^(-1),and persistent long-term stability.A further higher Ni concentration had an adverse effect on the electrocatalytic *** functional theory(DFT)calculations further verified the experimental *** doping could reduce the binding energy of Mo–H,facilitating the desorption of the adsorbed hydrogen(Hads)on the surface,thereby improving the intrinsic catalytic activity of Ni-doped Mo_(2)C-based ***,excessive Ni doping would inhibit the catalytic activity of the *** work not only provides a simple strategy for the facile preparation of non-precious metal electrocatalysts with high catalytic activity,but also unveils the influence mechanism of the Ni doping concentration on the HER performance of the electrocatalysts from the theoretical perspective.

关键词： Mo_(2)C@CFP electrocatalyst nickel(Ni)doping hydrogen evolution reaction(HER) water splitting molten salt method

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Increased Oxygen Evolution Activity in pH-Universal Electrocatalyst: Urea-Modified NiFeCoCN Medium-Entropy Alloy

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Chinese Journal of Chemistry 2023年第23期41卷 3290-3298页

作者： Hongwei Lv Zhiguo Ye Feng Pei Xinyuan Peng juntong huang Duosheng Li Zhong Jin School of Material Science and Engineering Nanchang Hangkong University696#FengHeNan RoadNanchangJiangxi330063 China State Grid Jiangxi Electric Power Research Institute NanchangJiangxi330096 China MOE Key Laboratory of Mesoscopic Chemistry MOE Key Laboratory of High Performance Polymer Materials and TechnologyJiangsu Key Laboratory of Advanced Organic MaterialsSchool of Chemistry and Chemical EngineeringNanjing UniversityNanjingJiangsu210023 China

The kinetic process of a slow oxygen evolution reaction (OER) always constrains the efficiency of overall water electrolysis for H2 *** particular,nonprecious metal electrodes for the OER have difficulty in possessing excellent electrocatalytic activity and stability in pH-universal media *** this work,urea is first used as a pore-forming agent and active C/N source to fabricate a nanoporous NiFeCoCN medium-entropy alloy (MEA) by high-temperature sintering based on the nanoscale Kirkendall *** NiFeCoCN MEA achieves an overpotential of 432 mV at a current density of 10 mA·cm^(-2) and a lower Tafel slope of 52.4 mV·dec^(-1) compared to the IrO_(2)/Ti electrode (58.6 mV·dec^(-1)) in a 0.5 mol/L H_(2)SO_(4) *** a 1 mol/L KOH solution,the NiFeCoCN MEA obtains an overpotential of 175 mV for 10 mA·cm^(-2) and a Tafel slope of 40.8 mV·dec^(-1),which is better than IrO_(2)/Ni *** work proves a novel strategy to design and prepare nanoporous MEA materials with desirable C/N species,which provides promising prospects for the industrial production of H2 energy.

关键词： Oxygen evolution reaction Medium-entropy alloy Urea Electrocatalytic activity Stability

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改性剂对含矿物固废添加剂制备的硫氧镁水泥性能的影响

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中国建材科技 2024年第2期33卷 16-20页

作者：曾逸豪黄军同肖金生南昌航空大学材料科学与工程学院江西南昌330063 江西金同矿筑耐火保温材料有限公司江西南昌330200

硫氧镁(MOS)水泥是一种由MgO-MgSO_(4)-H_(2)O三元体系组成的气硬性胶凝材料,在防火门芯板和外墙保温板等领域应用。但传统MOS水泥由于未经改性处理,限制了其更广泛的应用。本文以MgO粉体、硫酸镁为主体原料、矿物偏高岭土和固废粉煤灰... 详细信息

硫氧镁(MOS)水泥是一种由MgO-MgSO_(4)-H_(2)O三元体系组成的气硬性胶凝材料,在防火门芯板和外墙保温板等领域应用。但传统MOS水泥由于未经改性处理,限制了其更广泛的应用。本文以MgO粉体、硫酸镁为主体原料、矿物偏高岭土和固废粉煤灰为活性掺合料制备MOS水泥,研究柠檬酸、丙二酸、磷酸三钠等改性剂对MOS水泥的物相组成、力学性能及显微结构的影响。结果表明,当使用0.5%的柠檬酸和0.2%的丙二酸时,所制备MOS水泥的5Mg(OH)_(2)·MgSO_(4)·7H_(2)O(5·1·7相)凝结相特征变得显著,试样结构紧实,28d力学性能表现最佳,耐压强度和抗折强度分别达到100.14MPa和28.61MPa。

关键词：硫氧镁水泥改性剂力学性能显微结构

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Polydopamine nanolayer assisted internal photo-deposition of CdS nanocrystals for stable cosensitized photoanode

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Nano Research 2022年第10期15卷 8836-8845页

作者： Na Li Lu Han Hainan Zhang juntong huang Xudong Luo Xibao Li Yuanhao Wang Weiqi Qian Ya Yang School of Materials and Metallurgy University of Science and Technology LiaoningAnshan 114051China School of Materials Science and Engineering Nanchang Hangkong UniversityNanchang 330063China SUSTech Engineering Innovation Center School of Environmental Science and EngineeringSouthern University of Science and TechnologyShenzhen 518055China CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-nano Energy and SensorBeijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing 101400China

Hydrogen evolution via photo-electro-chemical(PEC)co-catalysis is potential for solving energy crisis and environmental *** rapidly advances of fabrication and broad applications of polydopamine(PDA)and its derivatives have drawn intense attentions in recent ***,an ultrathin PDA coating with nanometer accuracy was conformally grown on TiO_(2) nanotube arrays(NTAs)via electrochemical polymerization,in which the polymer provided a platform for further photoinduced assembly of CdS nanocrystals in the embedded *** optimized CdS@PDA/TiO_(2) NTAs hierarchical heterostructure as photoanode gave an excellent PEC performance and exhibited outstanding stability under light *** photocurrent density was heightened to 5.48 mA·cm^(–2),which was beneficial to H_(2) evolution with a rate of 20μmol·h^(–1)·cm^(–2).The improvement of PEC activity was ascribed to co-photosensitization,optimized carriers transfer,and transport route arised from CdS embedding,resulting to provide a persistent driving force for charge separation based on secure heterojunction of CdS/TiO_(2) glued by *** improvement of PEC stability was due to the inhibition of CdS photocorrosion covered by PDA *** advance boded well for the development of PEC field founded on multifunctional PDA.

关键词： polydopamine TiO_(2)nanotube arrays photoelectrocatalysis photocorrosion

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S/N-co-doped graphite nanosheets exfoliated via three-roll milling for high-performance sodium/potassium ion batteries

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Journal of Materials Science & Technology 2023年第16期147卷 47-55页

作者： Xin Wang Zhicong Luo juntong huang Zhi Chen Tong Xiang Zhijun Feng Jing Wang Sinong Wang Yongcun Ma Huiyong Yang Xibao Li School of Materials Science and Engineering Nanchang Hangkong UniversityNanchang 330063China

Due to its larger ionic radius,further studies are needed before graphite can be used as an anode for sodium/potassium-ion batteries(SIBs/KIBs).It is believed that doping and increasing the layer spacing can improve the Na+/K+***,S/N co-doped graphite nanosheets(GNS)with an enlarged interlayer spacing of 0.39 nm were prepared via exfoliation with three-roll milling(TRM)combined with thiourea heated at different *** method generates abundant defects and active sites for GNS,as well as facilitates rapid access and transport of electrolytes and electrons/*** electrochemical results show that the S/N-doped GNS exfoliated 15 times and heated at 600°C(SNGNS15-600)with thiourea as the electrode delivers a discharge capacity of 94 mAh g–1 over 6000 cycles at 10 A g–1 with an enhanced rate capability and stable performance for application in *** using density functional theory show that the increased interlayer spacing by TRM and S,N co-doping enhances the adsorption energies of Na+on graphite,thus improving the Na+*** the anode for KIBs,the SNGNS15-600 electrode has a capacity of 142 mAh g–1 after 5000 cycles at 0.5 A g–*** study provides an essential theoretical basis for the effective exfoliation of layered graphite-based materials and their applications in energy storage.

关键词： Graphite nanosheets S/N doping Three-roll milling Sodium-ion batteries Potassium-ion batteries

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Novel BiOBr/Bi2S3 high-low junction prepared by molten salt method for boosting photocatalytic degradation and H_(2)O_(2)production

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Journal of Materials Science & Technology 2023年第24期155卷 148-159页

作者： Shishi Shen Xibao Li Yingtang Zhou Lu Han Yu Xie Fang Deng juntong huang Zhi Chen Zhijun Feng Jilin Xu Fan Dong School of Materials Science and Engineering Nanchang Hangkong University Nanchang 330063 China National-Local Joint Engineering Research Center of Heavy Metal Pollutants Control and Resource Utilization Nanchang Hangkong University Nanchang 330063 China National Engineering Research Center for Marine Aquaculture Marine Science and Technology College Zhejiang Ocean University Zhoushan 316004 China School of Materials and Metallurgy University of Science and Technology Liaoning Anshan 114051 China Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of China Chengdu 611731 China

The molten salt method focuses on improving the crystallinity of synthetic materials and avoiding the high energy consumption of traditional synthesis *** this work,a novel BiOBr/Bi_(2)S_(3)high-low junction with large contact area was constructed by the molten salt method combined with the ion exchange *** unique energy band structure and new charge transfer mechanism realize the rapid migration of photogenerated charges between different ***,Bi_(2)S_(3)was grown on BiOBr in situ by a high-temperature molten salt *** to the deep valence band position of BiOBr and the narrow band gap of Bi_(2)S_(3),an intrinsic internal electric field and band bending are produced at the interface,forming a high-low junction photocatalyst with an intimate *** addition,the BiOBr/Bi_(2)S_(3)composite maintains a high oxidation potential and produces high and robust photocatalytic oxidation *** the molten state,the close binding of BiOBr and Bi_(2)S_(3)can be promoted through the ion-exchange strategy,resulting in excellent photocatalytic degradation rates of bisphenol A and tetracycline and in-situ generation of H_(2)O_(2).Finally,the mechanism of carriers separation and transfer in BiOBr/Bi_(2)S_(3)high-low junction is also *** functional theory(DFT)results found that the improvement of O_(2)adsorption ability would promote the occurrence of oxygen reduction reaction(ORR),and make positive contributions to the enhanced H_(2)O_(2)production *** study will provide a new perspective for broadening the spectral response range of Bi-based photocatalytic materials and preparing high-low junction photocatalysts with dense interface by the molten salt method.

关键词： Photocatalysis BiOBr Bi_(2)S_(3) High-low junction Molten salt

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Novel organic/inorganic PDI-Urea/BiOBr S-scheme heterojunction for improved photocatalytic antibiotic degradation and H_(2)O_(2) production

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Chinese Chemical Letters 2022年第12期33卷 5200-5207页

作者： Weiwei Wang Xibao Li Fang Deng Jiyou Liu Xiaoming Gao juntong huang Jilin Xu Zhijun Feng Zhi Chen Lu Han School of Materials Science and Engineering Nanchang Hangkong UniversityNanchang 330063China Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle Nanchang Hangkong UniversityNanchang 330063China Department of Chemistry and Chemical Engineering Shaanxi Key Laboratory of Chemical Reaction EngineeringYan'an UniversityYan'an 716000China School of Materials and Metallurgy University of Science and Technology LiaoningAnshan 114051China

The matched energy band structure and efficient carrier separation efficiency are the keys to heterogeneous photocatalytic reactions.A novel organic/inorganic step scheme(S-scheme)heterojunction PDI-Urea/BiOBr composite photocatalyst was constructed by simple solvothermal reaction combined with in-situ growth *** composite photocatalyst not only has high chemical stability,but also can generate and accumulate a large number of active species(h^(+),·O_(2)^(-),·OH,H_(2)O_(2)).PDI-Urea/BiOBr showed higher photocatalytic activity for the degradation of antibiotic such as ofloxacin(OFLO),tetracycline(TC)and the production of H_(2)O_(2) in the spectral range of 400-800 *** apparent rate constant of 15%PDI-Urea/BiOBr for photocatalytic degradation of TC(or OFLO)was 2.7(or 2.5)times that of pure BiOBr and 1.7(or 1.8)times that of pure *** H_(2)O_(2) evolution rate of 15%PDI-Urea/BiOBr was 2.5 times that of PDI-Urea and 1.5 times that of BiOBr,*** work has formed a mature S-scheme heterojunction design thought and method,which offers new visions for the development of heterogeneous photocatalysts.

关键词： Photocatalysis Perylene diimide Bismuth bromide oxide S-scheme heterojunction Antibiotic

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Bi and S Co-doping g-C_(3)N_(4)to Enhance Internal Electric Field for Robust Photocatalytic Degradation and H_(2) Production

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Chinese Journal of Structural Chemistry 2022年第6期41卷 69-78页

作者： Yan Hu Xibao Li Weiwei Wang Fang Deng Lu Han Xiaoming Gao Zhijun Feng Zhi Chen juntong huang Fanyan Zeng Fan Dong School of Materials Science and Engineering Nanchang Hangkong UniversityNanchang 330063China Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle Nanchang Hangkong UniversityNanchang 330063China School of Materials and Metallurgy University of Science and Technology LiaoningAnshan 114051China Department of Chemistry and Chemical Engineering Shaanxi Key Laboratory of Chemical Reaction EngineeringYan’an UniversityYan’an 716000China Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 611731China

By adjusting the type and proportion of doping elements in the g-C_(3)N_(4)-based photocatalyst,the internal electric field(IEF)strength of the semiconductor can be *** can effectively enhance the driving force of charge separation in the photocatalytic *** is found that the introduction of appropriate concentration of Bi and S into the skeleton structure of g-C_(3)N_(4)can achieve efficient degradation of tetracycline(TC)and other pollutants in the liquid environment and excellent photocatalytic H_(2)evolution performance(1139μmol·L^(-1)·h^(-1)).Since the prepared samples have similar crystal structures,the relative strength of IEF can be *** can be used as the basis for adjusting the IEF strength of g-C_(3)N_(4)-based semiconductor by element *** addition,the Bi and S co-doped g-C_(3)N_(4)samples after solvothermal reflux show good chemical stability and can reduce the nanostructure defects caused by co-doping of heteroatoms,thus it provides a novel solution for the construction of g-C_(3)N_(4)-based dual-function photocatalyst with high activity and stability.

关键词： photocatalysis g-C_(3)N_(4) co-doping IEF strength antibiotic

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