近年来，利用材料的弹性应变调控其物理和化学性质受到广泛关注，以往人们采用元素掺杂或合金化、原位变形及利用膜与基体的晶格错配等方法为纳米膜施加弹性应变，但所施加的弹性应变较小（不足1%）且不连续可调，导致弹性应变对材料功能特性的调控效果难以充分展现。本项目拟基于“基体点阵切变应变与纳米膜本征大弹性应变相匹配”的设计原则，选择NiTi形状记忆合金作为基体，对其表面Pt纳米膜和Cu纳米膜的弹性变形特征与机制进行研究，有望为纳米膜施加较大且连续可调的弹性应变，解决“弹性应变工程”的当务之急；进而，利用拉、压弹性应变对Pt纳米膜的电催化氧还原反应活性、Cu纳米膜的电催化CO2还原反应活性和产物选择性进行调控，并阐明电催化反应中“弹性应变效应”的独立影响规律及其机制，为高活性、高选择性电催化材料的研发提供理论依据。

Controlling the physical and chemical properties of materials by the means of elastic strain received extensive attention in the recent years. There are three methods of inducing elastic strain to the nanofilms in the previously reported work: elements doping or alloying, in-situ deformation, and overlayer based on lattice-mismatch between the substrate and film. However, strain-engineered effects could not be fully achieved due to the relatively small (less than 1%) and discrete elastic strain that imposed to the nanofilms. In this project, we will choose NiTi shape memory alloy as the substrate based on the design criterion that match the intrinsically large elastic strain of nanofilm with the lattice shear strain of the substrate, and study the elastic deformation behavior and mechanism of Pt nanofilm and Cu nanofilm on the NiTi substrate, which is expected to impose relatively large and continuous elastic strain to nanofilms and thus solve the urgent problem of the development of Elastic Strain Engineering; Furthermore, control the electrocatalytic activities of oxygen reduction reaction of Pt nanofilm and CO2 reduction reaction of Cu nanofilm by tensile strain or compressive strain, and adjust the products selectivity of CO2 reduction reaction of Cu nanofilm by elastic strain. In addition, the sole Elastic Strain Effects and its mechanism of the electrocatalytic reaction will be clarified, which may provide theoretical foundation for the development of highly active and highly selective electrocatalytic matetials.