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Tuning the reversible chemisorption of hydroxyl ions to promote the electrocatalysis on ultrathin metal-organic framework nanosheets

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Journal of Energy Chemistry 2022年第2期31卷 71-77页

作者： Hong Yu Yao Jing cheng-feng du Jiong Wang State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal MaterialsNorthwestern Polytechnical UniversityXi’an 710072ShaanxiChina Institute of Advanced Synthesis Northwestern Polytechnical UniversityXi’an 710072ShaanxiChina

Interfacial engineering to alter the configuration of active sites in heterogeneous catalysts is a potential strategy for activity enhancement,but it remains unelucidated for metal-organic frameworks(MOFs).Here,we demonstrate that the surface of two-dimensional Co-based MOF is modified by decorating Ag quantum dots(QDs)simply through in-situ reduction of Ag+*** oxygen evolution reaction(OER),it reveals that the catalysis is mediated by the reversible redox of Co sites between Co^(3+) and Co^(4+) states coupling with transfer of OH*** decoration of Ag QDs decreases the redox potential of Co sites,and thus effectively decreases the overpotential of *** TOFs of Co sites are increased by 77 times to reach 5.4 s^(-1) at an overpotential of 0.35 *** attribute the activity enhancement to the tuning of the coupling process between Co sites and OHions during the redox of Co sites by Ag QDs decoration based on Pourbaix analysis.

关键词： 2D metal-organic frameworks Interfacial engineering Pourbaix analysis Chemisorption of hydroxyl ions Oxygen evolution reaction

Ni nanoparticles anchoring on vacuum treated Mo_(2)TiC_(2)T_(x) MXene for enhanced hydrogen evolution activity

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Chinese Journal of Structural Chemistry 2023年第10期42卷 37-45页

作者： Xiangyuan Zhao Jinjin Wang Jinzhao Kang Xiaomei Wang Hong Yu cheng-feng du State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal MaterialsSchool of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi'an710072China Northwestern Polytechnical University Chongqing Technology Innovation Center Chongqing400000China

MXenes with metal nanoparticles(NPs)immobilized on their surface are greatly desired for high-performance electrocatalysts,while the homogeneous nucleation and growth of NPs are still ***,a new method has been proposed for uniformly anchoring Ni NPs on the altered surficial *** pre-vacuum treatment on Mo_(2)TiC_(2)T_(x)(oMX)not only removes the surficial terminal groups but also induces surface oxidation ***,the nucleation and growth behaviors of Ni NPs on the oMX are altered in the hydrothermal reaction,which results in a grain-size reduction of more than 50%as well as homogeneous ***,the oxidized surface contributes a strong coupling between oMX and Ni NPs via Ni−O binging,which endows the Ni@oMX hybrid with the lowest overpotential and high durability over 75 h in 1 M KOH solution for electrocatalytic hydrogen evolution reaction(HER).

关键词： Nickel nanoparticles MXene Hybrid Electrocatalysts Hydrogen evolution reaction

Layered Trichalcogenidophosphate:A New Catalyst Family for Water Splitting

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Nano-Micro Letters 2018年第4期10卷 152-166页

作者： cheng-feng du Qinghua Liang Raksha Dangol Jin Zhao Hao Ren Srinivasan Madhavi Qingyu Yan State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal Materials Northwestern Polytechnical University School of Materials Science and Engineering Nanyang Technological University

due to the rapidly increasing demand for energy and environmental sustainability, stable and economical hydrogen production has received increasing attention in the past decades. In this regard, hydrogen production through photo-or electrocatalytic water splitting has continued to gain ever-growing interest. However, the existing catalysts are still unable to fulfill the demands of highefficiency, low-cost, and sustainable hydrogen *** metal trichalcogenidophosphate(MPQ_3) is a newly developed two-dimensional material with tunable composition and electronic structure. Recently, MPQ_3 has been considered a promising candidate for clean energy generation and related water splitting applications. In this minireview, we firstly introduce the structure and methods for the synthesis of MPQ_3 materials. In the following sections, recent developments of MPQ_3 materials for photo-and electrocatalytic water splitting are briefly summarized. The roles of MPQ_3 materials in different reaction systems are also discussed. Finally, the challenges related to and prospects of MPQ_3 materials are presented on the basis of the current developments.

关键词： Two-dimensional materials Trichalcogenidophosphate Photocatalysis Electrocatalysis Water splitting

Co/Zn-metal organic frameworks derived functional matrix for highly active amorphous Se stabilization and advanced lithium storage

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Rare Metals 2023年第1期42卷 76-84页

作者： Hong Yu Jin-Zhao Kang Long-Sheng Huang Jin-Jin Wang Xiao-Mei Wang Xiang-Yuan Zhao cheng-feng du State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal MaterialsNorthwestern Polytechnical UniversityXi’an710072China Northwestern Polytechnical University Chongqing Technology Innovation Center Chongqing400000China College of Chemistry and Chemical Engineering Hubei UniversityWuhan430062China

Lithium-selenium batteries,as an advanced rechargeable battery system,have attracted wide ***,its application is hurdled by the ambiguous underlying mechanism such as the unclear active phase and the key role of the host ***,a three-dimensional(3D) functional matrix derived from the Co/Znmetal organic framework is synthesized to unravel the questions *** reveals that the strong interaction and voids in the 3D matrix serve to anchor the amorphous Se with high electrochemical *** obtained 3DC/Se exhibits 544.2 and 273.2 mAh·g^(-1) t current densities of 0.1C and 2.0C,respectively,with a diffusion-controlled *** excessive amount of Se beyond the loading capacity of the matrix leads to the formation of trigonal phase Se,which shows an unsatisfying electrochemical property.

关键词： Metal-organic frameworks(MOFs) Amorphous Se Functional matrix Li-Se batteries

V4C3Tx MXene:A promising active substrate for reactive surface modification and the enhanced electrocatalytic oxygen evolution activity

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InfoMat 2020年第5期2卷 950-959页

作者： cheng-feng du Xiaoli Sun Hong Yu Wei Fang Yao Jing Yonghui Wang Shuiqing Li Xianhu Liu Qingyu Yan State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal MaterialsNorthwestern Polytechnical UniversityShaanxiChina Key Laboratory of Materials Processing and Mold Zhengzhou UniversityMinistry of EducationZhengzhouChina Department of Energy and Power Engineering Tsinghua UniversityBeijingChina School of Materials Science and Engineering Nanyang Technological UniversitySingaporeSingapore

Presented are the synthesis,characterizations,and reactive surface modification(RSM)of a novel nine atomic layered V4C3Tx *** the advantages of the multilayered V4C3Tx MXene that can simultaneously support the RSM reaction and keep the inner skeleton stable,a series of amorphous Ni/Fe/Vternary oxide hydroxides thin layer can be successfully modified on the surface of the V4C3Tx MXene(denoted as MOOH@V4C3Tx,M=Ni,Fe,and V)without disrupting its original *** to the in situ reconstruction of highly active oxide hydroxide layer,the nanohybrids exhibited an enhanced oxygen evolution reaction(OER)activity and excellent long-time stability over 70 *** particular,a current density of 10 mA cm−2 can be reached by the nanohybrid with the optimized Ni/Fe ratio at an overpotential(η)as low as 275.2 mV,which is comparable to most of the state-of-the-art OER catalysts and better than other MXene-based *** by the tunable physicochemical properties and excellent structural stability of these nanohybrids,we may envision the promising role of the M4X3-based MXenes as substrates for a wide range of energy conversion and storage materials.

关键词： 2D material electrocatalysis MXene OER surface modification

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二维电催化剂的局域电子调控策略

Chinese Journal of Catalysis 2023年第5期48卷 1-14页

作者：杜乘风胡尔海余泓颜清宇西北工业大学先进润滑与密封材料中心凝固技术国家重点实验室陕西西安710072 南洋理工大学能源研究所新加坡南洋理工大学材料科学与工程学院新加坡

现代社会对能源的需求日益增长,资源和环境问题凸显,因此,近几十年可再生能源(太阳能、风能、潮汐能等)的利用受到广泛关注.电催化作为一种常温常压下即可实现的能量和物质转换技术,与传统工业技术相比具有更高的能量利用效率.更重要的... 详细信息

现代社会对能源的需求日益增长,资源和环境问题凸显,因此,近几十年可再生能源(太阳能、风能、潮汐能等)的利用受到广泛关注.电催化作为一种常温常压下即可实现的能量和物质转换技术,与传统工业技术相比具有更高的能量利用效率.更重要的是,得益于可控的电子转移步骤和相应的中间介质,电催化过程还表现出比传统路线更高的选择性、不受能源间歇性影响等优点,因此特别适合可再生能源领域乃至工业生产的应用.在电催化过程中,催化剂和吸附物之间的相互作用(如结合、静电吸引和斥力)起着至关重要的作用,而这种相互作用受分子电性、荷电量、吸附物构型甚至吸附物的取向等因素影响.从更深层次上讲,电催化剂的局域电子结构影响了其自由电子的分布、转移和流动,并极大地影响着催化剂和吸附物之间的相互作用,从而影响催化性能.而对具有大比表面积、高表面原子占比的二维电催化剂材料而言,其基平面原子通常为热力学稳定状态,催化活性不高.因此,亟待通过局域电子结构的调控进一步提升其电催化性能.目前,针对二维材料在能源转换与存储方面的应用已经有了许多优秀的综述,但多关注于材料体系或者催化性能,对催化剂局域电子结构变化及其电催化性能的构效关系这一关键问题探讨尚不深入.因此,本文聚焦于二维电催化剂设计构筑过程中局域电子结构的调控策略,以课题组开展的几个电催化前沿方向为例,讨论了几种调控策略对催化剂局域电子结构的影响机制.本课题组基于非贵金属基二维材料电催化剂的设计合成及性能调控,针对析氢反应、析氧反应、氮还原反应、氮氧化反应以及二氧化碳还原反应开展了系列研究.研究工作的核心思想之一是选择性地“激活”二维电催化剂基平面原子,以实现在其高表面暴露原子的基础上增加催化活性位点数量.本述评在已有工作的基础上对二维电催化剂的局域电子调控及其电催化性能构效关系进行了全面总结.在单个原子尺度上,通过杂原子掺杂、单原子负载和空位等手段有效改变催化活性位点周边键合环境,进而实现对二维材料催化活性位点附近局域电子结构的调控.通过在二维材料表面构筑异质结构改变界面电子结构,不仅可以实现第二相或二维基体自身的催化活性增强,还可以获得二者的催化协同效应.通过对二维材料晶格进行变形,引入外加应力,也可以显著改变材料的电子结构,进而影响表面原子的催化活性.基于上述策略,本文深入阐述了局域电子结构变化对二维材料电催化活性的影响机制.综上,本文为二维电催化剂的综合优化设计提供了新思路.

关键词：二维材料电催化电子结构活性位点异质结构

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液压支架并行设计系统的搭建及实施

煤矿机械 2018年第3期39卷 96-98页

作者：朱洪明吴成峰杜娜兖矿东华重工有限公司山东邹城273500

通过分析制造业的设计现状,提出了液压支架产品采用并行设计的必要性。分析液压支架传统串行设计特点、存在的问题,提出了采用并行设计的思路。且对并行设计系统的实现关键点进行了说明。实施并搭建了液压支架现代化的并行设计系统,成... 详细信息

通过分析制造业的设计现状,提出了液压支架产品采用并行设计的必要性。分析液压支架传统串行设计特点、存在的问题,提出了采用并行设计的思路。且对并行设计系统的实现关键点进行了说明。实施并搭建了液压支架现代化的并行设计系统,成功应用于实践,取得了良好的效果。

关键词：液压支架并行设计系统实施案例

9-From Selenidostannates to Silver-Selenidostannate:Structural Variation of Chalcogenides Synthesized in Ionic Liquid

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9-From Selenidostannates to Silver-Selenidostannate:Structur...

Raman Scattering from Fine Zn Particles Coated with ZnO

中国化学会第六届全国结构化学学术会议

作者： Jian-Rong Li~1,cheng-feng du~1,Wei-Wei Xiong~1 and Xiao-Ying Huang~(1*) 1 State Key Laboratory of Structural Chemistry,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Fuzhou 350002

Using the ionic liquid(IL) of imidazolium halide as solvent and structure directing agent,and amine as auxiliary solvent,we have isolated several nanoporous open-framework selenidostannates and a series of the largest discrete T5 cluster compounds with Cu-M-S constitutions(M = In,Ga).As a continuing effort of our research,presented here is the structural variation of selenidostannates or silver-selenidostannate synthesized in IL,namelyα-[bmmim][SnSe](1,bmmim = 1-butyl-2,3-dimethyl-imidazolium),

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Chinese Physics Letters 1996年第10期13卷 765-767页

作者： XU Jian-feng cheng Guang-xu du You-wei Department of Physics and Laboratory of Solid State Microstructures Center of Materials Analysis Nanjing UniversityNanjing 210093

Raman scattering from Zn fine spheric particles coated with ZnO of variable thickness is measured, and a broad line can be found. The Raman line shifts to lower frequency side with the increase of oxide thickness. A theoretical analysis based on the existence of surface phonon mode has been made. Agreement between experiment and theory is good.

关键词： Raman scattering theory