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Highly efficient and stable electrocatalyst for hydrogen evolution by molybdenum doped Ni-Co phosphide nanoneedles at high current density

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Nano Research 2024年第3期17卷 1066-1074页

作者： Chengyu Huang Zhonghong Xia jing Wang jing Zhang Chenfei Zhao Xingli Zou Shichun Mu Jiujun Zhang Xionggang Lu hong jin fan Shengjuan Huo Yufeng Zhao College of Sciences&Institute for Sustainable Energy Shanghai UniversityShanghai 200444China State Key Laboratory of Metastable Materials Science and Technology Hebei Key Laboratory of Heavy Metal Deep-Remediation in Water and Resource ReuseYanshan UniversityQinhuangdao 066004China State Key Laboratory of Advanced Special Steel and Shanghai Key Laboratory of Advanced Ferrometallurgy School of Materials Science and EngineeringShanghai UniversityShanghai 200444China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China School of Physical and Mathematical Sciences Nanyang Technological UniversitySingapore639798

There is an increasingly urgent need to develop cost-effective electrocatalysts with high catalytic activity and stability as alternatives to the traditional Pt/C in catalysts in water *** this study,microspheres composed of Mo-doped NiCoP nanoneedles supported on nickel foam were prepared to address this *** results show that the nanoneedles provide sufficient active sites for efficient electron transfer;the small-sized effect and the micro-scale roughness enhance the entry of reactants and the release of hydrogen bubbles;the Mo doping effectively improves the electrocatalytic performance of NiCoP in alkaline *** catalyst exhibits low hydrogen evolution overpotentials of 38.5 and 217.5 mV at a current density of 10 mA·cm^(-2) and high current density of 500 mA·cm^(-2),respectively,and only 1.978 V is required to achieve a current density of 1000 mA·cm^(-2) for overall water *** functional theory(DFT)calculations show that the improved hydrogen evolution performance can be explained as a result of the Mo doping,which serves to reduce the interaction between NiCoP and intermediates,optimize the Gibbs free energy of hydrogen adsorption(△G_(*H)),and accelerate the desorption rate of **** study provides a promising solution to the ongoing challenge of designing efficient electrocatalysts for high-current-density hydrogen production.

关键词： transition metal phosphides Mo-doped NiCoP hydrogen evolution reaction gradient hydrothermal water splitting

Enhanced degradation of florfenicol by microscale SiC/Fe:Dechlorination via hydrogenolysis

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Chinese Chemical Letters 2024年第7期35卷 218-221页

作者： Yun-Fei Zhang Chun-Hui Zhang Jian-Hui Xu Lei Li Dan Li jin-hong fan Jiale Gao Xin Quan Qi Wu Yue Zou Yan-Ling Liu Dongguan University of Technology School of Environment and Civil EngineeringDongguan 523830China State Key Laboratory of Pollution Control and Resource Reuse School of Environmental Science and EngineeringTongji UniversityShanghai 200092China

Herein,the degradation of florfenicol(FLO)over zero-valent iron(ZVI)enhanced by SiC was systematically *** was found that 5 g/L of ZVI/SiC(1:3)at pH 3.0 could completely degrade 20 mg/L of FLO within 1 h,with a Kobsvalue of 0.0873 min^(-1),12.5 times greater than that of pure ZVI(0.0069 min^(-1)).Vibrating sample magnetometer(VSM)characterizations revealed that the use of SiC supporter reduces the magnetic intensity of ZVI,which mitigates iron particle agglomeration,increases Brunauer-Emmett-Teller(BET)surface area,and enhances FLO degradation ***,ZVI/SiC exhibits a much lower hydrogen evolution potential(HEP)and significantly higher corrosion currents compared to pure *** was proposed to undergo degradation via reductive dechlorination,involving a hydrogenolysis mechanism that entails the cleavage of theσ*** study provides new insights into the reduction hydrogenation mechanism of ZVI.

关键词： Zero-valent iron Silicon carbide Reductive dechlorination Hydrogenolysis Florfenicol

From aqueous Zn-ion battery to Zn-MnO_(2) flow battery:A brief story

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Journal of Energy Chemistry 2021年第3期30卷 194-201页

作者： Tong Xue hong jin fan School of Materials Science and Engineering North Minzu UniversityYinchuan 750021NingxiaChina School of Physical and Mathematical Sciences and Innovative Centre for Flexible DevicesNanyang Technological UniversitySingapore 637371Singapore

Aqueous Zn-ion battery(AZIB)has become an attractive technology because of its unique features of low cost,high safety and the ***_(2) is the model cathode material for AZIB since the first report on reversible Zn-MnO_(2) battery,but recent studies have unveiled different charge storage *** to revamping of the electrochemistry and redesigning of the electrolyte and interface,there is tremendous performance enhancement in *** mini Review will first give a brief introduction of ZIB,including fundamentals of materials and components,and the progress in recent ***,a general classification of working mechanisms related to MnO_(2) in neutral and mildly acidic electrolyte is *** focus is put on the recent blossoming Zn-MnO_(2) electrolytic mechanism,which has given birth to the Zn-MnO_(2) redox flow batteries that are highly promising for large-scale static energy storage.

关键词： Aqueous zinc-ion battery Deposition/dissolution Electrolytic battery Zn-MnO2 flow battery

Cathodic electrolyte engineering toward durable Zn–Mn aqueous batteries

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National Science Review 2023年第12期10卷 42-44页

作者： Wanhai Zhou hong jin fan Dongyuan Zhao Dongliang Chao Laboratory of Advanced Materials Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials State Key Laboratory of Molecular Engineering of Polymers College of Chemistry and Materials Fudan University School of Physical and Mathematical Sciences Nanyang Technological University

Zn–Mn aqueous batteries (ZMABs)present potential for grid-scale energy storage with the benefits of low cost,high safety and eco-friendliness [1].Since 1866 (Leclanchéwet cell), we have witnessed the prosperity of Z... 详细信息

关键词： CHEMISTRY

Active plane modulation of Bi_(2)O_(3)nanosheets via Zn substitution for efficient electrocatalytic CO_(2)reduction to formic acid

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Nano Research 2023年第8期16卷 10803-10809页

作者： Yumei Liu Tiantian Wu hongfei Cheng Jiawen Wu Xiaodong Guo hong jin fan College of Chemical Engineering Sichuan UniversityChengdu 610065China School of Physical and Mathematical Sciences Nanyang Technological UniversitySingapore 637371Singapore School of Chemistry Xi’an Key Laboratory of Sustainable Energy Materials ChemistryState Key Laboratory of Electrical Insulation and Power EquipmentXi’an Jiaotong UniversityXi’an 710049China Institute of Materials Research and Engineering A*STAR2 Fusionopolis WaySingapore 138634Singapore

Formic acid is considered one of the most economically viable products for electrocatalytic CO_(2)reduction reaction(CO_(2)RR).However,developing highly active and selective electrocatalysts for effective CO_(2)conversion remains a grand ***,we report that structural modulation of the bismuth oxide nanosheet via Zn^(2+)cooperation has a profound positive effect on exposure of the active plane,thereby contributing to high electrocatalytic CO_(2)RR *** obtained Zn-Bi_(2)O_(3)catalyst demonstrates superior selectivity towards formate generation in a wide potential range;a high Faradaic efficiency of 95%and a desirable partial current density of around 20 mA·cm^(-2)are obtained at−0.9 V(*** hydrogen electrode(RHE)).As proposed by density functional theory calculations,Zn substitution is the most energetically feasible for forming and stabilizing the key OCHO*intermediate among the used metal ***,the more negative adsorption energy of OCHO*and the relatively low energy barrier for the desorption of HCOOH*are responsible for the enhanced activity and selectivity.

关键词： electrocatalytic CO_(2)reduction Bi_(2)O_(3)catalyst active plane modulation Zn substitution high selectivity

Aqueous Zn^(2+)/Na^(+) dual-salt batteries with stable discharge voltage and high Coulombic efficiency by systematic electrolyte regulation

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Science China Chemistry 2022年第2期65卷 399-407页

作者： Chunli Wang Lianshan Sun Maoxin Li Lin Zhou Yong Cheng Xin Ao Xiuyun Zhang Limin Wang Bingbing Tian hong jin fan SZU-NUS Collaborative Innovation Center for Optoelectronic Science&Technology International Collaborative Laboratory of 2D Materials for Optoelectronic Science and Technology of Ministry of EducationInstitute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060China School of Physical and Mathematical Science Nanyang Technological UniversitySingapore 637371Singapore China-Singapore International Joint Research Institute Guangzhou 510663China College of Physics Science and Technology Yangzhou UniversityYangzhou 225002China State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryCASChangchun 130022China Institute for Energy Research Jiangsu UniversityZhenjiang 212013China

While aqueous Zn-Na hybrid batteries have garnered widespread attention because of their low cost and high safety,it is still challenging to achieve long cycle-life and stable discharge-voltage due to sluggish reaction kinetics,zinc dendrite formation,and side ***,we design a Zn^(2+)/Na^(+) dual-salt battery,in which sodiation of the NVP cathode favors zinc intercalation under an energy threshold,leading to decoupled redox reactions on the cathode and *** investigations of the electrolyte effects show that the ion intercalation mechanism and the kinetics in the mixture of triflate-and acetate-based electrolytes are superior to those in the common acetate-only *** a result,we have achieved fast discharging capability,suppressed zinc dendrites,a stable discharge voltage at 1.45 V with small polarization,and nearly 100%Coulombic efficiency in the dual-salt mixture electrolyte with optimized concentration of 1 M Zn(OAc)_(2)+1 M NaCF_(3)SO_(3).This work demonstrates the importance of electrolyte regulation in aqueous dual-salt hybrid batteries for the energy storage.

关键词： dual-salt battery high voltage acetate electrolyte zinc dendrite Na_(3)V_(2)(PO_(4))_(3)

Enhancing bifunctionality of CoN nanowires by Mn doping for long-lasting Zn-air batteries

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Science China Chemistry 2020年第7期63卷 890-896页

作者： Yongqi Zhang Bo Ouyang Guankui Long Hua Tan Zhe Wang Zheng Zhang Weibo Gao Rajdeep Singh Rawat hong jin fan School of Physical and Mathematical Sciences Nanyang Technological University21 Nanyang Link637371Singapore Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 611731China Department of Applied Physics and Institution of Energy and Microstructure Nanjing University of Science and TechnologyNanjing 210094China Institute of Materials Research and Engineering A*STAR(Agency fo r ScienceTechnology and Research)Innovis 138634Singapore Natural Sciences and Science Education National Institute of EducationNanyang Technological UniversitySingapore 637616Singapore

Tailoring the nanostructure and composition of transition metal nitrides is highly important for their use as potent low-cost electrocatalysts. Cobalt nitride(CoN) exhibits strong catalytic activity for oxygen evolution reaction(OER). However, its poor catalytic efficiency for oxygen reduction reaction(ORR) hinders its application in rechargeable zinc-air batteries(ZABs) as the air cathode. In this work, we deploy the effective strategy of Mn doping to improve both OER and ORR activity of CoN nanowires as the cathode material for ZAB. Theoretical calculation predicts that moderate Mn doping in cobalt nitride results in a downshift of the d-band center and reduces the adsorption energy of reaction intermediates. With ~10 at% Mn dopants, stronger catalysis activities for both OER and ORR are achieved compared to pure CoN nanowires. Subsequently, both aqueous and flexible quasi-solid-state ZABs are constructed using the Mn-doped CoN nanowires array as additive-free air cathode. Both types of devices present large open circuit potential, high power density and long-cycle stability. This work pushes forward the progress in developing cost-effective ZABs.

关键词： bifunctional electrocatalyst Zn-air battery oxygen reduction reaction flexible battery plasma processing

Semi-analytical Solutions for Wellbores with Graded Skin Zones in Poroelastic Media

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Acta Mechanica Solida Sinica 2024年第3期37卷 385-395页

作者： Zhiqiang fan Zhihe jin School of Mechanics Civil Engineering and ArchitectureNorthwestern Polytechnical UniversityXi’an710072China Department of Mechanical Engineering University of MaineOronoME04469USA

In analyzing the complex interaction between the wellbore and the reservoir formation,the hydromechanical properties of the region proximal to the wellbore,referred to as the“wellbore skin zone”,play a pivotal role in determining flow dynamics and the resulting formation *** models of the wellbore skin zone generally assume a constant permeability throughout,resulting in a sharp permeability discontinuity at the skin-reservoir *** paper introduces a model for a wellbore with a continuously graded skin zone of finite thickness within a poroelastic *** solutions are derived using the Laplace transform method,addressing both positive and negative skin *** results are presented to illustrate the effects of graded permeability/skin zone thickness on pore pressures and stresses around a *** results highlight a distinct divergence in stress and pore pressure fields when comparing wellbores with negative skin zones to those with positive skin zones or no skin at all.

关键词： Poroelastic Graded permeability Analytical solution Wellbore Skin zone

基于学生视角的高校旅游管理专业课堂教学质量评价研究

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吉林工程技术师范学院学报 2024年第3期40卷 40-48页

作者：彭雅诗王思佳易芳芳金弘范黄颖彤广东培正学院广东广州510830

本文基于学生视角对高校旅游管理专业课堂教学质量进行量化评价,以广东省某高校旅游管理专业学生为研究对象,采用SERVQUAL模型评价旅游管理专业课堂教学质量现状,并结合IPA矩阵分析,旨在发现课堂教学存在的问题。研究结论如下:旅游管理... 详细信息

本文基于学生视角对高校旅游管理专业课堂教学质量进行量化评价,以广东省某高校旅游管理专业学生为研究对象,采用SERVQUAL模型评价旅游管理专业课堂教学质量现状,并结合IPA矩阵分析,旨在发现课堂教学存在的问题。研究结论如下:旅游管理专业教学质量存在课程可选择范围有限、新教师对教学设计不熟悉、教材和课程缺乏实践性、教师课后日常反馈不及时等问题。为此,学校可建设多元化的课程体系,重视新教师课堂教学技能培训,拓展实践教学渠道,建立课后师生交流互动机制,以培养适应旅游行业发展的高素质人才。

关键词：学生视角旅游管理专业 SERVQUAL模型课堂教学质量