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Self-gating enhanced carrier transfer in semiconductor electrocatalyst verified in microdevice

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Chinese Chemical Letters 2022年第6期33卷 3221-3226页

作者： Haiyan Xiang Yueshao Zheng Yang Chen Yanting Xu Travis Shihao Hu yexin feng Yu Zhou Song Liu Xuli Chen State Key Laboratory of Chemo/Biosensing and Chemometrics College of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082China Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices School of Physics and ElectronicsHunan UniversityChangsha 410082China Department of Mechanical Engineering California State UniversityLos AngelesCA 90032United States School of Physics and Electronics Central South UniversityChangsha 410082China College of Materials Science and Engineering Hunan UniversityChangsha 410082China

Semiconductor electrocatalysis with weak conductivity can accumulate extremely high carriers at semiconductor-electrolyte interface by self-gating effect,which strongly promotes electrocatalytic *** correlation between semiconductor carrier mobility and electrocatalysis performance is still *** atomic-thin transition metal dichalcogenides based composites have been developed for hydrogen evolution reaction(HER)performed with on-chip *** and electrochemical measurement of individual flack verified the key role of high carrier mobility for enhanced HER *** mobility regulation further demonstrated its high dependence with HER performance under *** study provides new insight into the carrier mobility of the semiconductor in the electrocatalysis,paving the way for designing high-performance semiconductor catalysts.

关键词： Chemical vapor deposition Pt NPs@MoS_(2) Hydrogen evolution reaction Microelectrochemical Self-gating

Interface Effect of Ru-MoS_(2) Nanoflowers on Lignin Substrate for Enhanced Hydrogen Evolution Activity

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Energy & Environmental Materials 2021年第1期4卷 117-125页

作者： Yeqing Xu Xingxing Jiang Gonglei Shao Haiyan Xiang Sisi Si Xing Li Travis Shihao Hu Guo Hong Shengyi Dong Huimin Li yexin feng Song Liu Institute of Chemical Biology and Nanomedicine (ICBN) State Key Laboratory of Chemo/Biosensing and Chemometrics College of Chemistry and Chemical Engineering Hunan UniversityChangsha Hunan 410082China Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices School of Physics and Electronics Hunan UniversityChangsha Hunan 410082 China Institute of Chemical Biology and Nanomedicine State Key Laboratory of Chemo/Biosensing and ChemometricsCollege of Chemistry and Chemical Engineering Hunan UniversityChangsha Hunan 410082 China College of Chemistry and Chemical Engineering Hunan UniversityChangsha Hunan 410082 China Department of Mechanical Engineering California State UniversityLos Angeles CA 90032 USA Institute of Applied Physics and Materials Engineering Department of Physics and Chemistry Faculty of Science and Technology University of MacaoAvenida da UniversidadeTaipa Macao SAR 999078 China School of Physics Peking UniversityBeijing 100871 China

The catalytic performance of Molybdenum disulfide(MoS_(2)) has been still far from that of Pt-based catalysts for inadequate active sites and sluggish electron transfer kinetics. Through engineering the interface between MoS_(2)-based materials and supported substrates, hybrid Ru-doped MoS_(2) on carbonized lignin(CL) is designed and prepared as efficient catalyst for hydrogen evolution reaction(HER). The CL substrate not only facilitates the growth of MoS_(2) nanoflowers, but also promotes the electron transfer. Ru doping increases active sites greatly for HER. The hybrid catalyst achieves a low onset overpotential of 25 mV and a low Tafel slope of 46 m V dec^(-1). The favorable HER activity ascribes to the interfacial interaction between MoS_(2) and CL. Density functional theory calculations further confirm the improved HER performance with doped Ru atoms. This study presents a prototype application to design electrocatalysts with enhanced carrier mobility and high-density active sites based on interface effect.

关键词： carbonized lignin hydrogen evolution reaction interface effect molybdenum disulfide

S vacancies in 2D SnS_(2) accelerating hydrogen evolution reaction

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Science China Materials 2022年第7期65卷 1833-1841页

作者： Gonglei Shao Haiyan Xiang Mengjie Huang Yi Zong Jun Luo yexin feng Xiong-Xiong Xue Jie Xu Song Liu Zhen Zhou Engineering Research Center of Advanced Functional Material Manufacturing of Ministry of Education School of Chemical EngineeringZhengzhou UniversityZhengzhou 450001China Institute of Chemical Biology and Nanomedicine(ICBN) State Key Laboratory of Chemo/Biosensing and ChemometricsCollege of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082China School of Physics and Optoelectronics Xiangtan UniversityXiangtan 411105China Institute of Functional Nano and Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesSoochow UniversitySuzhou 215123China School of Materials Science and Engineering Tianjin University of TechnologyTianjin 300384China Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices School of Physics and ElectronicsHunan UniversityChangsha 410082China

Precise manipulation of atomic defects is essential for modulating the intrinsic properties of two-dimensional(2D)*** this study,sulfur(S)atoms are accurately knocked out in the 2D basal plane of pure tin disulfide(SnS_(2)).By varying the annealing temperatures(250–350℃),SnS_(2)with different S vacancy concentrations(Vs-SnS_(2))can be *** SnS_(2)is annealed at 350℃ for 5 h,the S vacancies in the forms of single S atom and double S atoms could reach up to 30.5%.The Vs-SnS_(2)is tested in the microelectrocatalytic hydrogen evolution reaction(HER).Vs-SnS_(2)with S vacancies of 30.5%generates superior catalytic performance,with a Tafel slope of 74 mV dec^(-1) and onset potential of 141 *** mechanism has been ***,computation confirms that the absence of S atoms prompts surface charge modulation and enhances electronic *** addition,the under-coordinated Sn atoms adjacent to S vacancy introduce the lattice distortion and charge density redistribution,which are beneficial to hydrogen binding in *** short,accurate knockout of specific atoms by controlling the annealing temperature is a promising strategy to explore structure-dependent properties of various 2D materials.

关键词： SnS_(2) annealing S vacancy HAADF-STEM hydrogen evolution reaction

Controlling Initial Nucleation of Graphene on Transition Metal Surfaces:A Fist-Principles Calculation Study

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Controlling Initial Nucleation of Graphene on Transition Met...

Dual-channel type tunable field-effect transistors based on vertical bilayer WS2(1−x)Se2x/SnS2 heterostructures

中国化学会第30届学术年会-第四十分会：纳米体系理论与模拟

作者： yexin feng Lixin Zhang School of Physics and Electronics Hunan University School of Physics Nankai University

The atomic step edges on a transition-metal(TM)surface play an important role in surface catalysis due to their distinct reactivities from that of the *** non-uniform growth of graphene on Ni(111)is just such a *** first-principles calculations,we show that the step edges of Ni(111)can be passivated in varying degrees by surface alloying with a series of carefully chosen *** alloyed surface can be more uniform between the edges

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InfoMat 2020年第4期2卷 752-760页

作者： Biyuan Zheng Dong Li Chenguang Zhu Jianyue Lan Xingxia Sun Weihao Zheng Huawei Liu Xuehong Zhang Xiaoli Zhu yexin feng Tao Xu Litao Sun Gengzhao Xu Xiao Wang Chao Ma Anlian Pan Key Laboratory for Micro-Nano Physics and Technology of Hunan Province State Key Laboratory of Chemo/Biosensing and ChemometricsCollege of Materials Science and EngineeringHunan UniversityChangshaChina School of Physics and Electronics Hunan UniversityChangshaChina Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of SciencesSuzhouChina SEU-FEI Nano-Pico Center Key Laboratory of MEMS of Ministry of EducationSoutheast UniversityNanjingChina

Layered semiconductor heterostructures are essential elements in modern electronic and optoelectronic *** engineering the composition of these heterostructures may enable the flexible design of the properties of heterostructure-based electronics and optoelectronics as well as their ***,we report for the first time a two-step chemical vapor deposition approach for a series of WS2(1−x)Se2x/SnS2 vertical heterostructures with high-quality and large *** steady-state photoluminescence results exhibit an obvious composition-related quenching ratio,revealing a strong coherence between the band offset and the charge transfer efficiency at the junction *** on the achieved heterostructures,dual-channel backgate field-effect transistors were successfully designed and exhibited typical composition-dependent transport behaviors,and pure n-type unipolar transistors to ambipolar transistors were realized in such *** direct vapor growth of these novel vertical WS2(1−x)Se2x/SnS2 heterostructures could offer an interesting system for probing new physical properties and provide a series of layered heterostructures for high-quality devices.

关键词： dual channel field-effect transistor heterostructure semiconductor alloy two-dimensional materials

On the quantum nature of the nuclei in solids, in liquids, and on surfaces

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On the quantum nature of the nuclei in solids, in liquids, a...

中国化学会第十届全国无机化学学术会议

作者： yexin feng Ji Chen Wei Fang Angelos Michaelides Enge Wang Xin-Zheng Li School of Physics Peking University Department of Physics and Astronomy University College London

Molecules and condensed matters are entities composed by interacting electrons and nuclei. Therefore, an ideal computer simulation needs to address both the electronic and the nuclear systems accurately, as well as their couplings. Compared with the more and more accurate quantum treatments of the interacting electronic systems, theoretical descriptions of the nuclei still largely remain at the classical level. In this talk, we will explain our recent invesitigations on the quantum nature of the nuclei in molecular clusters and solids/liquids [1-3], and on surfaces [4]. The basic technique we use is ab initio path-integral molecular dynamics. To accomodate the requirements associated with some specific problems, we also combine it with two-phase simulations, with thermodynamics integrations, with effective model Hamiltonian, and with quantum dynamics, in order to address the quantum nature of the nuclei in the corresponding statistics and dynamics.

关键词： Quantum Tunneling Nuclear Quantum Effects

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浅谈法治视野下的警察盘问检查权

公安理论与实践（上海公安高等专科学校学报） 2016年第6期26卷 63-69页

作者：冯叶欣上海市公安局黄浦分局上海200023

"警察"一词,可分解诠释为"警之于前,察之于后"。盘问检查权作为警察职权的重要体现,涵盖了"警察"两字的双重意义——预防与打击违法犯罪。在建设法治中国的今天,盘问检查权的实施不但需要保证实体正义,更需要保障其中的程序正义。在法... 详细信息

"警察"一词,可分解诠释为"警之于前,察之于后"。盘问检查权作为警察职权的重要体现,涵盖了"警察"两字的双重意义——预防与打击违法犯罪。在建设法治中国的今天,盘问检查权的实施不但需要保证实体正义,更需要保障其中的程序正义。在法治视野下,警察盘问检查权的实施必将更加趋于严谨,愈发符合法理。警察盘问检查权的理论与实践,势必将成为未来我国法学领域研究的重点。

关键词：警察盘问检查权法治违法犯罪人权

A novel method for AFRPs burrs removal:Principle of mechanochemo-induced fiber fracture

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Chinese Journal of Aeronautics 2024年第7期37卷 522-538页

作者： Jie XU Bo LI Pingfa feng Qiang WANG feng feng Division of Advanced Manufacturing Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055China Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China Changhe Aircraft Industry(Group)Co.Ltd Jingdezhen 333000China

Burrs generated during the machining of Aramid-Fiber-Reinforced Composites(AFRPs)pose a challenge for the production efficiency of aircraft and helicopter housing *** studies have generally attempted to suppress burrs by referring to delamination suppression *** contrast to stratification,burrs are remediable machining *** such,a mechanochemical method with burrs trimming technological strategy are implemented to effectively combat ***,we clarify the mechanism by which aramid fibers cannot be cut off using analytical and numerical *** addition,the mechanism of fiber fracture with Modified Polyurethane Reactive Polymer(M-PUR),and development of anti-burr devices(thermostatic adhesive sealed generator)are ***,the experimental results show that the reduction rate in burr length is 87%-91%through the mechanochemical *** method not only opens a new avenue to solve the burr problem of aramid fibers but also builds an interdisciplinary bridge between polymer science and composite machining.

关键词： Mechanochemical method Burrs Orthogonal cutting Aramid fiber-reinforced composites Milling

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路径积分分子动力学模拟在相变问题中的应用

科学通报 2015年第30期60卷 2824-2832页

作者：冯页新陈基李新征王恩哥北京大学国际量子材料科学中心北京100871 北京大学物理学院北京100871

依据玻恩-奥本海默近似,理论模拟分子与凝聚态体系材料的性质,需要人们对电子结构和原子核运动两个层面的内容都进行尽量准确描述.目前,电子结构的计算已相对成熟,很多情况下密度泛函理论、传统量化或量子蒙特卡洛方法都能在量子力学的... 详细信息

依据玻恩-奥本海默近似,理论模拟分子与凝聚态体系材料的性质,需要人们对电子结构和原子核运动两个层面的内容都进行尽量准确描述.目前,电子结构的计算已相对成熟,很多情况下密度泛函理论、传统量化或量子蒙特卡洛方法都能在量子力学的层面给出相当精准的结果;但就原子核运动的描述而言,绝大部分理论方法却还依赖于经典力学.越来越多的实验和理论工作表明,在很多材料的相变过程中,原子核的量子属性可能对相变行为产生重要的影响.将路径积分分子动力学方法与两相法、自由能计算等分子模拟方法结合,可以有效地处理相变问题中的核量子效应,进而对材料的相变行为进行准确地描述.本文将结合两个具体的例子,简要介绍近几年我们在该研究方向的一些工作进展.

关键词：路径积分分子动力学核量子效应两相法自由能计算