应变对析氢反应催化剂TiC2性能影响的研究
Investigation of strain effect on hydrogen evolution reaction catalysts of TiC2
孙楠楠 1赵志超 2赵翠莲 1吉庆昌 1张宇1
作者信息
- 1. 河北水利电力学院基础部,沧州 061000
- 2. 河北水利电力学院基础部,沧州 061000;河北省数据中心相变热管理技术创新中心,沧州 061000
- 折叠
摘要
应变工程是一种有效地用来调整原子薄膜材料的电子、磁性和光学性能的策略.利用第一性原理计算,我们表明应变也可以有效地调节TiC2的析氢反应(HER)的催化活性,这是电解水电化学制氢所必需的.我们主要考虑0-8％范围的拉伸应变,研究发现,在25％的氢覆盖率下双轴拉伸比单轴拉伸能更有效的提高HER活性,但b方向拉伸后的TiC2结构具有更高的氢最大覆盖率,且b方向的拉伸应变对不同氢覆盖率的TiC2单层片的催化性能都有很大的提高.电子结构计算表明,拉伸应变可以激活相对惰性的内部价电子,从而引起体系的失稳和催化活性的提高.在本工作中获得的见解可能有助于利用应变作为一种有效手段来提高二维材料的催化活性,并探索更有效地调整其电子结构和催化活性的新方法.
Abstract
Strain engineering is an effective strategy to tune the electronic,magnetic and optical properties of a-tomically thin materials.Using first-principles calculations,we show that strain is also effective for tuning the catalytic activity of TiC2 towards the hydrogen evolution reaction(HER),which is essential for electrochemical hydrogen from water splitting.We only consider the range from 0 to 8％.It is found that biaxial tensile strain can enhance the HER activity more effectively than uniaxial stretching at 25％hydrogen coverage.However,the TiC2 sheet has the highest maximum hydrogen coverage by the stretching in the b direction,and the tensile strain in the b direction greatly improves the catalytic performance of TiC2 monolayers with different hydrogen covera-ges.Electronic structure calculations show that tensile strain can activate the relatively inert inner valence elec-trons,which leads to the instability of the system and the improvement of catalytic activity.The insights obtained in the present work may prove to be instrumental in improving the catalytic activity of two-dimensional materials using strain as an effective means and in exploring new approaches for more effectively tuning their electronic structure and catalytic activities.
关键词
密度泛函理论/TiC2单层片/覆盖率/应变Key words
Density functional theory/TiC2 monolayer sheet/Coverage rate/Strain引用本文复制引用
基金项目
河北省高等学校科学技术研究项目资助(ZC2023187)
河北水利电力学院基本科研业务费专项资金资助(SYKY2011)
沧州市自然科学基金资助(204001001)
出版年
2024
国家科技期刊平台
NSTL
万方数据