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Tailoring the Porous Structure of Mono-dispersed Hierarchically Nitrogen-doped Carbon Spheres for Highly Efficient Oxygen Reduction Reaction

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Energy & Environmental Materials 2021年第1期4卷 81-87页

作者： chengyong shu Zhuofan Gan Yuyang Hou Ting Zhu Jijun Ma Wei Tang Yuping Wu School of Chemical Engineering and Technology Xi'an Jiaotong UniversityXi'an 710049China CSIRO Mineral Resources Clayton Vic 3168Australia School of Materials Science and Engineering Central South UniversityChangsha 410083China State Key Laboratory of Space Power-Sources Technology Shanghai Institute of Space Power-SourcesShanghai 200245China State Key Laboratory of Materials-Oriented Chemical Engineering School of Energy Science and Engineering and Institute of Advanced MaterialsNanjing Tech UniversityNanjing 211800China

The search for a low-cost metal-free cathode material with excellent mass transfer structure and catalytic activity in oxygen reduction reaction(ORR)is one of the most challenging issues in fuel *** this work,nitrogen-rich mphenylenediamine is introduced into the synthesis of porous carbon spheres to tune the pore structure and nitrogen-doped active *** a result,more pyridinic N and pyrrolic N functional species were observed at the interior and surface of the carbon *** introduction of m-phenylenediamine also regulated the nucleating of precursors,an urchin-like mesoporous surface structure ensures point contact and less agglomeration between each particle was *** optimized proportion of micropores/mesopores and improved nitrogen-contained functional species,the ORR activity can be remarkably *** half-wave potential of this catalyst could achieve to 0.81 V(versus RHE)which is only 42 m V lower than commercial Pt/C ***,the optimized cathode catalyst achieved a 69 m W cm-2 maximum power density when operated in direct methanol fuel cells at room temperature.

关键词： fuel cells metal-free catalysts nitrogen-doped porous carbon oxygen reduction reaction

A Universal Strategy For N-Doped 2D Carbon Nanosheets With Sub-Nanometer Micropore For High-Performance Supercapacitor

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Energy & Environmental Materials 2021年第4期4卷 569-576页

作者： Jiangqi Zhou Li Jiang chengyong shu Long Kong Iqbal Ahmad Ya-Nan Zhou Wei Tang Xiaofei Sun Yuping Wu State Key Laboratory for Mechanical Behavior of Materials School of Chemical Engineering and TechnologyXi'an Jiaotong UniversityXi’an 710049China State Key Laboratory of Space Power-Sources Technology Shanghai Institute of Space Power-SourcesShanghai 200245China Academy for Advanced Interdisciplinary Studies Southern University of Science and TechnologyShenzhen 518055China State Key Laboratory for Manufacturing Systems Engineering School of Mechanical EngineeringXi’an Jiaotong UniversityXi’an 710049China State Key Laboratory of Materials-Oriented Chemical Engineering School of Energy ScienceNanjing Tech UniversityNanjing 211800China

Preparing carbon nanosheets with precise control of open porous morphology via universal process and understanding the relationship between structure and capacitive performance are very urgent for achieving advanced ***,we propose a simple yet effective additive-free method to transform a bulk layered potassium phthalimide salt to novel nitrogen-doped twodimensional carbon sheets by self-activation during *** obtained samples showed large-sized and flat structure with lateral size around 10μm,uniform sub-nanometer micropore size distribution of about 0.65 nm dimension,large specific surface area up to 2276.7 m^(2)g^(-1),and suitable nitrogen *** from these merits,the optimized sample delivers a high specific capacitance of 345 F g^(-1)at 1 A g^(-1)and retains 270 F g^(-1)even at 50 A g^(-1)in6.0 M KOH ***,the symmetric supercapacitor shows maximum energy densities of 16.43 Wh kg^(-1)and 23.6 Wh kg^(-1)in 6.0 M KOH and 1.0 M Na_(2)SO_(4)electrolytes,***,on account the universality and simplicity of this method,the undoped as-prepared carbon sheet with uniform sub-nanometer micropore distribution can be synthesized from different potassium-containing salts with layered structure,which can be employed as a model for a deep understanding the effect of sub-nanometer micropores on capacitive *** find the number of micropores centered at 0.65 nm can be applied as one indicator to clarify the correlation between capacitance and critical pore size below 1 nm.

关键词： universal strategy sub-nanometer micropore carbon nanosheet supercapacitors

Sandwich-type composited solid polymer electrolytes to strengthen the interfacial ionic transportation and bulk conductivity for all-solid-state lithium batteries from room temperature to 120℃

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Journal of Energy Chemistry 2024年第8期95卷 288-295,I0007页

作者： Jiewen Tan Zhen Wang Jiawu Cui Zhanhui Jia Wensheng Tian Chao Wu Chengxin Peng chengyong shu Kang Yang Wei Tang School of Chemical Engineering and Technology Xi'an Jiaotong UniversityXi'an 710049ShaanxiChina Center for Advancing Materials Performance from the Nanoscale(CAMP-Nano) State Key Laboratory for Mechanical Behavior of MaterialsXi'an Jiaotong UniversityXi'an 710049ShaanxiChina State Key Laboratory of Space Power-sources Technology Shanghai Institute of Space Power-SourcesShanghai 200245China School of Materials Science and Engineering University of Shanghai for Science and TechnologyShanghai 200093China Top-Energy Digital Manufacturing Technologies(Xi'an)Co. Ltd.Xi'an 710100ShaanxiChina

The insurmountable charge transfer impedance at the Li metal/solid polymer electrolytes(SPEs)interface at room temperature as well as the ascending risk of short circuits at the operating temperature higher than the melting point,dominantly limits their applications in solid-state batteries(SSBs).Although the inorganic filler such as CeO_(2)nanoparticle content of composite solid polymer electrolytes(CSPEs)can significantly reduce the enormous charge transfer impedance at the Li metal/SPEs interface,we found that the required content of CeO_(2)nanoparticles in SPEs varies for achieving a decent interfacial charge transfer impedance and the bulk ionic conductivity in *** this regard,a sandwich-type composited solid polymer electrolyte with a 10%CeO_(2)CSPEs interlayer sandwiched between two 50%CeO_(2)CSPEs thin layers(sandwiched CSPEs)is constructed to simultaneously achieve low charge transfer impedance and superior ionic conductivity at 30℃.The sandwiched CSPEs allow for stable cycling of Li plating and stripping for 1000 h with 129 mV polarized voltage at 0.1 mA cm^(-2)and 30℃.In addition,the LiFePO_(4)/Sandwiched CSPEs/Li cell also exhibits exceptional cycle performance at 30℃and even elevated120℃without short *** multi-layered CSPEs with optimized contents of the inorganic fillers can be an efficient method for developing all solid-state PEO-based batteries with high performance at a wide range of temperatures.

关键词： PEO-based solid electrolytes CeO_(2)nanoparticles Charge transfer impedance Sandwich-type composite electrolytes All-solid-state Li metal batteries

Metal-free two-dimensional phosphorene-based electrocatalyst with covalent P-N heterointerfacial reconstruction for electrolyte-lean lithium-sulfur batteries

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Carbon Energy 2024年第5期6卷 175-185页

作者： Jiangqi Zhou chengyong shu Jiawu Cui Chengxin Peng Yong Liu Weibo Hua Laura Simonelli Yuping Wu Shi Xue Dou Wei Tang School of Chemical Engineering and Technology Xi'an Jiaotong UniversityXi'anChina School of Materials Science and Engineering University of Shanghai for Science and TechnologyShanghaiChina State Key Laboratory of Space Power-Sources Technology Shanghai Institute of Space Power-SourcesShanghaiChina CELLS-ALBA Synchrotron BarcelonaSpain School of Energy and Environment Southeast UniversityNanjingChina

The use of lithium-sulfur batteries under high sulfur loading and low electrolyte concentrations is severely restricted by the detrimental shuttling behavior of polysulfides and the sluggish kinetics in redox ***-dimensional(2D)few layered black phosphorus with fully exposed atoms and high sulfur affinity can be potential lithium-sulfur battery electrocatalysts,which,however,have limitations of restricted catalytic activity and poor electrochemical/chemical *** resolve these issues,we developed a multifunctional metal-free catalyst by covalently bonding few layered black phosphorus nanosheets with nitrogen-doped carbon-coated multiwalled carbon nanotubes(denoted c-FBP-NC).The experimental characterizations and theoretical calculations show that the formed polarized P-N covalent bonds in c-FBP-NC can efficiently regulate electron transfer from NC to FBP and significantly promote the capture and catalysis of lithium polysulfides,thus alleviating the shuttle ***,the robust 1D-2D interwoven structure with large surface area and high porosity allows strong physical confinement and fast mass ***,with c-FBP-NC as the sulfur host,the battery shows a high areal capacity of 7.69 mAh cm^(−2) under high sulfur loading of 8.74 mg cm^(−2) and a low electrolyte/sulfur ratio of 5.7μL mg^(−1).Moreover,the assembled pouch cell with sulfur loading of 4 mg cm^(−2) and an electrolyte/sulfur ratio of 3.5μL mg^(−1) shows good rate capability and outstanding *** work proposes an interfacial and electronic structure engineering strategy for fast and durable sulfur electrochemistry,demonstrating great potential in lithium-sulfur batteries.

关键词： black phosphorus electronic structure high sulfur loading interfacial covalent bonds lean electrolyte

Synergistic effect between Co single atoms and Pt nanoparticles for efficient alkaline hydrogen evolution

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Materials Futures 2024年第3期3卷 111-120页

作者： chengyong shu Jingwen Cao Zhuofan Gan Peixi Qiu Zhixu Chen Lian Guanwu Zhongxin Chen Chengwei Deng Wei Tang School of Chemical Engineering and Technology Xi’an Jiaotong UniversityXi’an 710049People’s Republic of China School of Science and Engineering The Chinese University of Hong KongShenzhenGuangdong 518172People’s Republic of China State Key Laboratory of Space Power-Sources Technology Shanghai Institute of Space Power SourcesShanghai 200245People’s Republic of China

In the pursuit of sustainable energy solutions,the efficiency of the hydrogen evolution reaction(HER)in alkaline conditions has been a significant challenge,primarily due to the sluggish dissociation of water molecules on platinum(Pt)*** this critical issue,our study introduces an innovative Pt-Co@NCS *** catalyst synergistically combines Pt nanoparticles with Co single atoms on a nitrogen-doped carbon scaffold,overcoming the traditional bottleneck of slow water *** unique porous concave structure and nitrogen-enriched surface not only provide abundant anchoring sites for Co atoms but also create a conducive hydrophilic environment around the Pt *** design leads to a drastic improvement in the water dissociation process,as demonstrated by CO stripping and deuterium labeling *** an outstanding current density of 162.8 mA cm^(−2) at−0.1 V versus RHE,a Tafel slope of 26.2 mV dec^(−1),and a superior nominal mass activity of 15.75 mAμgPt^(−1),the Pt-Co@NCS catalyst represents a significant step forward in enhancing alkaline HER efficiency,indicating promising advancements in the field.

关键词： synergistic catalysis single atom catalysts alkaline water splitting flow electrolyser hydrogen evolution

Hierarchically mesoporous carbon spheres coated with a single atomic Fe-N-C layer for balancing activity and mass transfer in fuel cells

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Carbon Energy 2022年第1期4卷 1-11页

作者： chengyong shu Qiang Tan Chengwei Deng Wei Du Zhuofan Gan Yan Liu Chao Fan Hui Jin Wei Tang Xiao-dong Yang Xiaohua Yang Yuping Wu School of Chemical Engineering and Technology Xi'an Jiaotong UniversityXi'anChina State Key Laboratory for Mechanical Behavior of Materials School of Material Science and EngineeringXi'an Jiaotong UniversityXi'anChina State Key Laboratory of Space Power-Sources Technology Shanghai Institute of Space Power SourcesShanghaiChina State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong UniversityXi'anChina College of Materials Science and Engineering Huaqiao UniversityXiamenChina Institute of Quantum and Sustainable Technology(IQST) School of Chemistry and Chemical EngineeringJiangsu UniversityZhenjiangChina State Key Laboratory of Materials-Oriented Chemical Engineering School of Energy Science and Engineering and Institute of Advanced MaterialsNanjing Tech UniversityNanjingChina

Novel cost-effective fuel cells have become more attractive due to the demands for rare and expensive platinum-group metal(PGM)catalysts for mitigating the sluggish kinetics of the oxygen reduction reaction(ORR).The high-cost PGM catalyst in fuel cells can be replaced by earth-abundant transition-metalbased catalysts,that is,an Fe-N-C catalyst,which is considered one of the most promising ***,the performance of the Fe-N-C catalyst is hindered by the low catalytic activity and poor stability,which is caused by insufficient active sites and the lack of optimization of the triple-phase interface for mass ***,a novel Fe–N–C catalyst consisting of mono-dispersed hierarchically mesoporous carbon sphere cores and single Fe atom-dispersed functional shells are *** synergistic effect between highly dispersed Fe-active sites and well-organized porous structures yields the combination of high ORR activity and high mass transfer *** half-wave potential of the catalyst in 0.1M H_(2)SO_(4) is 0.82 V versus reversible hydrogen electrode,and the peak power density is 812 mW·cm^(−2) in H_(2)–O_(2) fuel ***,it shows superior methanol tolerance,which is almost immune to methanol poisoning and generates up to 162 mW·cm^(−2) power density in direct methanol fuel cells.

关键词： fuel cell hierarchically mesoporous carbon spheres oxygen reduction reaction single‐atom catalysts

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机械合金化制备Fe-10%Ni合金研究

稀有金属材料与工程 2014年第12期43卷 3177-3182页

作者：海侠女席生岐张月李龙雨孙崇峰舒程勇西安交通大学金属材料强度国家重点实验室陕西西安710049

采用纯Fe粉和Ni粉利用高能卧式搅拌球磨机制备了Fe-10%Ni（质量分数,下同）合金,利用X射线衍射（XRD）、扫描电子显微镜（SEM）、差热分析（DTA）研究了球磨粉末的相组成、形貌和热稳定性,并对其热压烧结的块材进行了组织分析与性能测... 详细信息

采用纯Fe粉和Ni粉利用高能卧式搅拌球磨机制备了Fe-10%Ni（质量分数,下同）合金,利用X射线衍射（XRD）、扫描电子显微镜（SEM）、差热分析（DTA）研究了球磨粉末的相组成、形貌和热稳定性,并对其热压烧结的块材进行了组织分析与性能测试。结果表明,在球磨机转速400 r/min,球料比20：1条件下,球磨8 h后,Ni原子完全固溶在Fe原子晶格中,形成体心立方结构Fe（Ni）过饱和固溶体,延长时间到16 h,球磨粉末颗粒尺寸更均匀细小,但仍为体心立方Fe（Ni）固溶体。对球磨16 h的合金粉末在500~800℃进行退火处理,发现粉末结构稳定,仍为体心立方Fe（Ni）固溶体。对球磨16 h的合金粉末进行热压烧结,发现950℃下烧结块材中出现少量fcc结构的Fe（Ni）固溶体相,而继续在970℃复烧后则完全转变为面心立方结构的Fe（Ni）,但950℃热压烧结块材的强度和延伸率高于970℃复烧的块材,原因在于无压复烧块材中产生氧化物和孔洞。

关键词：机械合金化球磨粉末退火固溶体烧结成型拉伸性能

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农用柔性底盘前轮转向动力学研究

农业机械学报 2022年第2期53卷 401-411页

作者：周福阳郭康权张新月贾祎涵舒成勇西北农林科技大学机械与电子工程学院陕西杨凌712100

农用柔性底盘通过偏置转向轴转向,4个独立的电动轮既要用于行进,又要驱动转向,控制难度大。为探明柔性底盘前轮转向过程的转向特性,建立了7自由度整车动力学模型,并通过Matlab/Simulink软件建立相应的交互控制仿真模型,进行了不同车速... 详细信息

农用柔性底盘通过偏置转向轴转向,4个独立的电动轮既要用于行进,又要驱动转向,控制难度大。为探明柔性底盘前轮转向过程的转向特性,建立了7自由度整车动力学模型,并通过Matlab/Simulink软件建立相应的交互控制仿真模型,进行了不同车速下单轮驱动转向与双轮比例控制转向的仿真与分析,根据仿真结果制定了控制策略;在此基础上,设计了实车的电子控制硬件与软件系统,进行了实车转向试验。结果表明:转向时两前转向轮之间存在较强的耦合作用,耦合的关键因素是两转向轮转向角偏离阿克曼转向几何导致的轮胎回正力矩,该回正力矩阻止这种偏离,同时偏离程度越大,回正力矩越大,反之亦然;前轮转向系统具有较强的非线性,转向角相同时,转向过程中所需的车轮驱动力矩与车速的平方成正比;7自由度整车动力学模型转向仿真结果与实测结果吻合程度较高。该研究可为柔性底盘前轮转向通用控制策略的制定提供仿真平台与理论依据。

关键词：柔性底盘动力学模型前轮转向转向特性试验

Relative Gromov-Witten invariants of projective completions of vector bundles

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Science China Mathematics 2019年第7期62卷 1429-1438页

作者： chengyong Du School of Mathematical Sciences Sichuan Normal University

It was proved by Fan and Lee(2016) and Fan(2017) that the absolute Gromov-Witten invariants of two projective bundles P(Vi)→ X are identified canonically when the total Chern classes c(V1) and c(V2) satisfy c(V1)= c(V2) for two bundles V1 and V2 over a smooth projective variety X. In this paper, we show that the relative Gromov-Witten invariants of(P(Vi ⊕ O), P(Vi)), i = 1, 2 are identified canonically when c(V1)= c(V2),where P(Vi ⊕ O) are the projective completions of the bundles Vi → X, and the projective bundles P(Vi) are the exceptional divisors in P(Vi ⊕ O).

关键词： projective completion relative Gromov-Witten invariant uniqueness blow-up along complete intersection