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Sulfur doped iron-nitrogen-hard carbon nanosheets as efficient and robust noble metal-free catalysts for oxygen reduction reaction in PEMFC

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Journal of Energy Chemistry 2024年第2期89卷 422-433,I0010页

作者： Bin Liu Jiawang Li Bowen Yan Qi Wei Xingyu Wen Huarui Xie Huan He pei kang shen Zhi Qun Tian Collaborative Innovation Center of Sustainable Energy Materials School of Physical Science and TechnologyGuangxi UniversityGuangxi Key Laboratory of Electrochemical Energy MaterialsState Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite StructuresNanning 530004GuangxiChina

Transition metal-nitrogen-carbon(M-N-C)as a promising substitute for the conventional noble metalbased catalyst still suffers from low activity and durability for oxygen reduction reaction(ORR)in proton exchange membrane fuel cells(PEMFCs).To tackle the issue,herein,a new type of sulfur-doped ironnitrogen-hard carbon(S-Fe-N-HC)nanosheets with high activity and durability in acid media were developed by using a newly synthesized precursor of amide-based polymer with Fe ions based on copolymerizing two monomers of 2,5-thiophene dicarboxylic acid(TDA)as S source and 1,8-diaminonaphthalene(DAN)as N source via an amination *** as-synthesized S-Fe-N-HC features highly dispersed atomic Fe Nxmoieties embedded into rich thiophene-S doped hard carbon nanosheets filled with highly twisted graphite-like microcrystals,which is distinguished from the majority of M-N-C with soft or graphitic carbon *** unique characteristics endow S-Fe-N-HC with high ORR activity and outstanding durability in 0.5 M H_(2)SO_(4).Its initial half-wave potential is 0.80 V and the corresponding loss is only 21 m V after 30,000 ***,its practical PEMFC performance is a maximum power output of 628.0 mW cm^(-2)and a slight power density loss is 83.0 m W cm^(-2)after 200-cycle practical ***,theoretical calculation shows that the activity of Fe Nxmoieties on ORR can be further enhanced by sulfur doping at meta-site near FeN_(4)*** results evidently demonstrate that the dual effect of hard carbon substrate and S doping derived from the precursor platform of amid-polymers can effectively enhance the activity and durability of Fe-N-C catalysts,providing a new guidance for developing advanced M-N-C catalysts for ORR.

关键词： Transition metal-nitrogen-carbon Oxygen reduction reaction Hard carbon Amide based polymer reaction Proton exchange membrane cells

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Emerging strategies and developments in oxygen reduction reaction using high-performance platinum-based electrocatalysts

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Nano Research 2024年第5期17卷 3516-3532页

作者： Asad Ali Aatto Laaksonen Guo Huang Shahid Hussain Shuiping Luo Wen Chen pei kang shen Jinliang Zhu Xiaoyan Ji Energy Engineering Division of Energy ScienceLuleåUniversity of Technology97187 LuleåSweden Department of Materials and Environmental Chemistry Arrhenius LaboratoryStockholm UniversitySE-10691 StockholmSweden Center of Advanced Research in Bionanoconjugates and Biopolymers “Petru Poni”Institute of Macromolecular ChemistryIasi 700469Romania State Key Laboratory of Materials-Oriented and Chemical Engineering Nanjing Tech UniversityNanjing 211816China College of Materials Science and Engineering Shenzhen UniversityShenzhen 518060China School of Resources Environment and MaterialsState Key Laboratory of Processing for Non-ferrous Metal and Featured MaterialsGuangxi UniversityNanning 530004China

The global practical implementation of proton exchange membrane fuel cells(PEMFCs)heavily relies on the advancement of highly effective platinum(Pt)-based electrocatalysts for the oxygen reduction reaction(ORR).To achieve high ORR performance,electrocatalysts with highly accessible reactive surfaces are needed to promote the uncovering of active positions for easy mass *** this critical review,we introduce different approaches for the emerging development of effective ORR electrocatalysts,which offer high activity and *** strategies,including morphological engineering,geometric configuration modification via supporting materials,alloys regulation,core-shell,and confinement engineering of single atom electrocatalysts(SAEs),are discussed in line with the goals and requirements of ORR performance *** review the ongoing development of Pt electrocatalysts based on the syntheses,nanoarchitecture,electrochemical performances,and *** eventually explore the obstacles and research directions on further developing more effective electrocatalysts.

关键词： oxygen reduction reaction(ORR) Pt-based electrocatalysts proton exchange membrane fuel cells(PEMFCs) morphology and alloys strategies single atom electrocatalysts(SAEs)

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MnS–MnO heterogeneous nanocube@N,S-doped carbon as a highly efficient bifunctional water splitting electrocatalyst

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Rare Metals 2024年第5期43卷 1977-1988页

作者： Xue-Qian Wang Xiang-Ying Ma Wang-Zhi Wu Hui-Bing He Nan-Nan Wang Ren-Ji Zheng Shao-Jian Ma Yan-Qiu Zhu pei-kang shen Jin-Liang Zhu School of Resources Environment and MaterialsState Key Laboratory of Featured Metal Materials and Life-Cycle Safety for Composite StructuresCollege of Chemistry and Chemical EngineeringGuangxi UniversityNanning 530004China School of Chemistry and Chemical Engineering Guangxi MinzuUniversity Nanning 530006 China School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083China

A stable,efficient,and economical bifunctional electrolytic catalyst would be incredibly beneficial for the development of hydrogen production by electrocatalytic water *** this study,we synthesized a novel MnS–MnO heterogeneous nanocube@N,S-doped carbon(MnS–MnO@NSC).MnS–MnO nanocubes possess rich heterogeneous interfaces and plentiful catalytic active sites to promote electrochemical reactions,while the N,S-doped carbon shell possesses excellent conductivity and catalytic properties and protects the ***–MnO@NSC exhibited excellent electrochemical properties as an effective bifunctional electrocatalyst for the hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)in KOH *** the HER,the overpotential was as low as 124 mV at a current density of 10 mA·cm^(-2)while in the OER,it was only 340 mV at 100 mA·cm^(-2)under the same *** addition,a MnS–MnO@NSC||MnS–MnO@NSC electrolyzer exhibited almost comparable activity and higher steadiness than those exhibited by the state-of-the-art Pt/C||RuO_(2)/C system for full water splitting in KOH solution.

关键词： Manganese sulfide Manganese oxide Doped carbon Heterogeneous nanocube Water splitting

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Recent development of Au arched Pt nanomaterials as promising electrocatalysts for methanol oxidation reaction

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Nano Research 2022年第1期15卷 18-37页

作者： Wenhua Lou Asad Ali pei kang shen Collaborative Innovation Center of Sustainable Energy Materials Guangxi Key Laboratory of Electrochemical Energy MaterialsGuangxi UniversityNanning 530004China School of Physical Science and Technology Guangxi UniversityNanning 530004China School of Chemistry&Chemical Engineering Guangxi UniversityNanning 530004China

The recent development of Aurum(Au)introduced Platinum(Pt)based nanomaterials is of great significance to direct methanol fuel cell as electrocatalysts for anode reactions,due to its stability and anti-poisoning ***,the performance of PtAu based catalysts with different elements,atomic ratio,and morphology was studied in methanol solution to further improve its electrocatalytic ***,the effects of Au have aroused the researchers'attention in Pt-based *** this review,we summarize the controllable synthesis,mechanism,and catalytic performance of Au introduced Pt-based electrocatalysts such as PtAu core-shell nanostructures,PtAu dendrite,PtAu nanowires,self-supporting Au@Pt NPs,and Au@Pt star-like nanocrystals for the methanol oxidation ***,the challenges and research directions for the future development of PtAu based catalysts are provided.

关键词： methanol oxidation reaction(MOR) direct methanol fuel cell(DMFC) PtAu based catalysts anode catalysts electrocatalysis

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Innovative Strategies for Overall Water Splitting Using Nanostructured Transition Metal Electrocatalysts

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Electrochemical Energy Reviews 2022年第4期5卷 286-315页

作者： Asad Ali Fei Long pei kang shen Collaborative Innovation Center of Sustainable Energy Materials Guangxi Key Laboratory of Electrochemical Energy MaterialsState Key Laboratory of Processing for Non-Ferrous Metal and Featured MaterialsGuangxi UniversityNanning 530004PR China Guilin University of Technology Guilin 541004China

Electrochemical water splitting is regarded as the most auspicious technology for renewable sources,transport,and storage of hydrogen ***,noble Pt metal and noble-metal oxides(IrO_(2)and RuO_(2))are recognized as state-of-the-art electrocatalysts for both the hydrogen evolution reaction(HER)and oxygen evolution reaction(OER),*** for earth-abundant electrocatalysts for the HER and OER with remarkable performance and high stability to replace precious metals plays a significant role in the commercial application of electrochemical water *** this review,recent advancements in nanostructured transition metal electrocatalysts are assessed through the selected examples of nitrides,carbides,phosphides,sulfides,borides,layered double hydroxides,and *** breakthroughs in nanostructured transition metal electrocatalysts are discussed in terms of their mechanisms,controllable production,structural design,and innovative strategies for boosting their *** instance,most nanostructured transition metal electrocatalysts for overall water splitting(OWS)only function well in neutral and alkaline ***,current research challenges and future perspectives for increasing the performance of nanostructured transition metals for OWS are proposed.

关键词： Hydrogen evolution reaction(HER) Oxygen evolution reaction(OER) Overall water splitting(OWS) Transition metal electrocatalyst Innovative strategies Basic electrochemistry

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Vanadium-based compounds and heterostructures as functional sulfur catalysts for lithium-sulfur battery cathodes

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Journal of Energy Chemistry 2023年第11期86卷 118-134,I0003页

作者： Xinji Dong Qiao Deng Fengxing Liang pei kang shen Jinliang Zhu Cheng Tang School of Resources Environment and MaterialsState Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite StructuresGuangxi UniversityNanning 530004GuangxiChina Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology Department of Chemical EngineeringTsinghua UniversityBeijing 100084China

Lithium-sulfur(Li-S)batteries have attracted wide attention for their high theoretical energy density,low cost,and environmental ***,the shuttle effect of polysulfides and the insulation of active materials severely restrict the development of Li-S *** conductive sulfur scaffolds with catalytic conversion capability for cathodes is an efficient approach to solving above ***-based compounds and their heterostructures have recently emerged as functional sulfur catalysts supported on conductive *** compounds interact with polysulfides via different mechanisms to alleviate the shuttle effect and accelerate the redox kinetics,leading to higher Coulombic efficiency and enhanced sulfur *** on vanadium-based nanomaterials in Li-S batteries have been steadily increasing over the past several *** this review,first,we provide an overview of the synthesis of vanadium-based compounds and ***,we discuss the interactions and constitutive relationships between vanadium-based catalysts and polysulfides formed at sulfur *** summarize the mechanisms that contribute to the enhancement of electrochemical performance for various types of vanadium-based catalysts,thus providing insights for the rational design of sulfur ***,we offer a perspective on the future directions for the research and development of vanadium-based sulfur catalysts.

关键词： Vanadium-based compound Vanadium-based heterostructure Lithium-sulfur battery Sulfur catalyst Polysulfide regulation

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Rational synthesis of chitin-derived nitrogen-doped porous carbon nanofibers for efficient polysulfide confinement

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Nano Research 2023年第6期16卷 8478-8487页

作者： Shanfeng Yang Shuiping Luo Xinji Dong Li Tian pei kang shen Jinliang Zhu School of Resources Environment and MaterialsCollaborative Innovation Centre of Sustainable Energy MaterialsCollege of Chemistry and Chemical EngineeringGuangxi UniversityNanning 530004China Department of Chemistry and Academy for Advanced Interdisciplinary Studies Southern University of Science and Technology(SUSTech)Shenzhen 518055China Hunan Provincial Key Laboratory of Advanced Materials for New Energy Storage and Conversion Hunan University of Science and TechnologyXiangtan 411201China

Principles of inexpensive biotechnology are being increasingly used to address the problems posed by the use of lithium-sulfur *** used chitin,a low-cost marine biowaste product,as a precursor for the in-situ preparation of chitin-derived nitrogendoped hierarchical porous carbon fibers(CNHPCFs)containing abundant *** materials are characterized by varying morphologies and high specific surface areas and present a hierarchical porous *** adsorb polysulfides,exhibit good ionic conductivity,and can be potentially used to generate green *** properties help address the problems of volume expansion and slow *** CNHPCF-1@S cathode exhibits excellent cycling performance and high capacity(1368.80 mAh·g^(−1)at 0.2 C;decay rate:0.011%per turn at 5 C).The high electrochemical reversibility recorded for CNHPCF-1@S and the stepwise reaction mechanism followed were studied using the in-situ X-ray diffraction and in-situ Raman spectroscopy *** results reported herein can potentially help develop new ideas for the recycling and treatment of marine *** results can also provide a platform to improve the application prospects of lithium-sulfur batteries.

关键词： chitin carbon fiber Li-S battery in-situ Raman in-situ X-ray diffraction

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High-performance proton exchange membrane fuel cell with ultra-low loading Pt on vertically aligned carbon nanotubes as integrated catalyst layer

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Journal of Energy Chemistry 2022年第8期31卷 497-506,I0013页

作者： Qing Hao Meng Chao Hao Bowen Yan Bin Yang Jia Liu pei kang shen Zhi Qun Tian Collaborative Innovation Center of Sustainable Energy Materials School of Physical Science and TechnologyGuangxi UniversityGuangxi Key Laboratory of Electrochemical Energy MaterialsState Key Laboratory of Processing for Non-ferrous Metal and Featured MaterialsNanning 530004GuangxiChina

Reducing a Pt loading with improved power output and durability is essential to promote the large-scale application of proton exchange membrane fuel cells(PEMFCs).To achieve this goal,constructing optimized structure of catalyst layers with efficient mass transportation channels plays a vital ***,PEMFCs with order-structured cathodic electrodes were fabricated by depositing Pt nanoparticles by Ebeam onto vertically aligned carbon nanotubes(VACNTs)growth on Al foil via plasma-enhanced chemical vapor *** demonstrate that the proportion of hydrophilic Pt-deposited region along VACNTs and residual hydrophobic region of VANCTs without Pt strongly influences the cell performance,in particular at high current *** Pt nanoparticles deposit on the top depth of around 600 nm on VACNTs with a length of 4.6μm,the cell shows the highest performance,compared with others with various lengths of *** delivers a maximum power output of 1.61 W cm^(-2)(H_(2)/O_(2),150 k Pa)and 0.79 W cm^(-2)(H_(2)/Air,150 k Pa)at Pt loading of 50μg cm^(-2),exceeding most of previously reported PEMFCs with Pt loading of<100μg cm^(-2).Even though the Pt loading is down to 30μg cm^(-2)(1.36 W cm^(-2)),the performance is also better than 100μg cm^(-2)(1.24 W cm^(-2))of commercial Pt/C,and presents better *** excellent performance is critical attributed to the ordered hydrophobic region providing sufficient mass passages to facilitate the fast water drainage at high current *** work gives a new understanding for oxygen reduction reaction occurred in VACNTs-based ordered electrodes,demonstrating the most possibility to achieve a substantial reduction in Pt loading<100μg cm^(-2) without sacrificing in performance.

关键词： Proton exchange membrane fuel cells Order-structured catalyst layer Vertically aligned carbon nanotubes Ultra-low Pt loading Membrane electrode assembly

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Nonprecious metal's graphene-supported electrocatalysts for hydrogen evolution reaction: Fundamentals to applications

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Carbon Energy 2020年第1期2卷 99-121页

作者： Asad Ali pei kang shen Collaborative Innovation Center of Sustainable Energy Materials Guangxi Key Laboratory of Electrochemical Energy MaterialsGuangxi UniversityNanningChina State Key Laboratory of Processing for Non-ferrous Metal and Featured Materials Guangxi UniversityNanningChina

Sustainable production of hydrogen is a hopeful requirement of a strategic future economy and *** splitting driven by electricity is a favorable pathway for renewable hydrogen *** critical review highlighted recent efforts toward the development of the nanoscale synthesis of nonprecious metal's graphene-supported electrocatalysts and their electrocatalytic features for remarkable hydrogen evolution reaction(HER).Different essential nonprecious metal's graphene-supported electrocatalysts,including metal carbides,sulfides,phosphides,selenides,oxides,and nitrides are *** the exploration,attention is given to the strategies of activity enhancement,the synthetic approach,and the composition/structure electrocatalytic-performance relationship of these HER *** are hopeful that this review confers a new momentum to the rational design of remarkable performance nonprecious metal's graphenesupported electrocatalysts and comprehensive guide for researchers to utilize the subject catalysts in regular water splitting.

关键词： graphene hydrogen evolution reaction nonprecious metal electrocatalysts water splitting

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A Coordinate-Free Approach to the Design of Generalized Griffis-Duffy Platforms

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Chinese Journal of Mechanical Engineering 2024年第3期37卷 95-103页

作者： Chengwei shen Xu pei Lubin Hang Jingjun Yu College of Optical Mechanical and Electrical EngineeringZhejiang A&F UniversityHangzhou 311300China School of Mechanical Engineering and Automation Beihang UniversityBeijing 100191China School of Mechanical and Automotive Engineering Shanghai University of Engineering ScienceShanghai 201620China

Architectural singularity belongs to the Type II singularity,in which a parallel manipulator(PM)gains one or more degrees of freedom and becomes *** remaining permanently in a singularity are beneficial for linearto-rotary motion ***-Duffy(GD)platform is a mobile structure admitting a Bricard *** this paper,we present a coordinate-free approach to the design of generalized GD platforms,which consists in determining the shape and attachment of both the moving platform and the fixed *** generalized GD platform is treated as a combination of six coaxial single-loop mechanisms under the same *** to the inversion,hidden in the geometric structure of these single-loop mechanisms,the mapping from a line to a circle establishes the geometric transformation between the fixed base and the moving platform based on the center of inversion,and describes the shape and attachment of the generalized GD ***,the center of inversion not only identifies the location of rotation axis,but also affects the shape of the platform mechanism.A graphical construction of generalized GD platforms using inversion,proposed in the paper,provides geometrically feasible solutions of the manipulator design for the requirement of the location of rotation axis.

关键词： Generalized Griffis-Duffy platforms Self-motion Inversion Coordinate-free determination Manipulator design

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