金属电极表面应变对氧电化学吸附的影响
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- 英文论文题名：The effect of surface strain of metal electrode on the oxygen electrosorption process
- 论文作者：邓齐波
- 英文论文作者：Qibo Deng ; School of Materials Science and Engineering ; Tianjin University of Technology
- 年：2016
- 作者机构：天津理工大学材料科学与工程学院;
- 论文关键词：表面应变 ; 金属催化剂 ; 氧电吸附过程 ; 晶格常数 ; 表面结构可控性
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第十五分会：表界面结构调控与催化
- 语种：中文
- 分类号：O643.36;O647.3
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第十五分会 ; 表界面结构调控与催化
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：108k
- 原文格式：D
- 会议级别：全国
摘要
金属催化剂在燃料电池、氢能源等新能源开发中扮演着至关重要的角色。如何设计和制备出高活性的催化剂材料是开发新能源所面临的一个关键问题。目前许多新型催化剂(如双相层状金属、核壳结构),研究发现表面高活性原子之间的晶格常数发生了改变;在晶体内部成分不变的情况下,晶格的变化反映了晶体内部受力状态的变化,宏观上材料表面发生了形变。从而我们可利用材料表面力学行为(应力、应变等)来调控金属电极的催化性能。通过在金属电极催化剂表面施加机械应变,我们将研究表面应变对氧电化学吸附过程的影响。研究发现在不同的吸附阶段弹性拉伸应变具有不同的作用[1,2]:i)初始的电极表面吸附阶段,拉伸应变减低氧的吸附焓,从而有利于氧吸附;ii)而随着氧在表面吸附量的增加,发生了氧-金属原子位置置换过程(replacement-turnover process),拉伸应变起到了抑制作用。从而进一步理解应变对电化学过程的影响,为通过调节金属催化剂表面结构来提高催化性能提供了一定的实验基础。
The investigations have been seen an increasing interest on the design and fabrication of new catalysts with high catalytic activity in the field of new energy.Advanced materials for heterogeneous catalysis often exhibit that an active component is enriched in the surface layer of atoms.An inherent feature of those catalysts is that the atoms of active component at the surface do not,in general,see the same interatomic spacing as in their elemental crystalline state.It indicates the strain can enhance the catalytic activity.Our study of interest here is the effect of surface strain of metal electrode on oxygen electrosorption process.The findings indicate that tensile strain makes gold surfaces less noble in the sense that the strain suppresses the oxygen adsorption on top of the bulk-terminated surface.However,when it comes to the replacement-turnover process,our results show that tensile strain actually makes gold surfaces more noble.
The investigations have been seen an increasing interest on the design and fabrication of new catalysts with high catalytic activity in the field of new energy.Advanced materials for heterogeneous catalysis often exhibit that an active component is enriched in the surface layer of atoms.An inherent feature of those catalysts is that the atoms of active component at the surface do not,in general,see the same interatomic spacing as in their elemental crystalline state.It indicates the strain can enhance the catalytic activity.Our study of interest here is the effect of surface strain of metal electrode on oxygen electrosorption process.The findings indicate that tensile strain makes gold surfaces less noble in the sense that the strain suppresses the oxygen adsorption on top of the bulk-terminated surface.However,when it comes to the replacement-turnover process,our results show that tensile strain actually makes gold surfaces more noble.
引文
[1]Q.Deng*and J.Weissmüller,Langmuir,2014,30:10522
[2]Q.Deng*,V.Gopal and J.Weissmüller,Angew.Chem.Int.Ed.,2015,54:12981.
[2]Q.Deng*,V.Gopal and J.Weissmüller,Angew.Chem.Int.Ed.,2015,54:12981.