This work investigates the in situ capacitive charging/discharging process of a carbon cloth surface under an external mechanical strain in order to understand the strain-modulated electrochemistry of an amorphous material. Our work first quantifies the electrochemical change in capacitive potential, E, in response to an applied linear strain, ε. The experimental data show that tensile strain could positively shift the capacitive potential. More importantly, the discharging time, a significant representative parameter of the energy storage performance of a material, is shortened when mechanically stretched. This phenomenon suggests that the specific capacitance is strain-dependent, and tensile strain decreases the specific capacitance of carbon cloth. This dependence could be attributed to a change in the surface free energy of carbon cloth when it is mechanically stretched. External mechanical work can modulate the typical capacitive process on not only metal or metal-oxide surfaces with specific lattice structures but also the surfaces of amorphous materials.

这项工作研究在外部机械应变下碳布表面的原位电容充电/放电过程，以了解非晶材料的应变调制电化学。我们的工作首先量化了响应于施加的线性应变ε的电容电势E的电化学变化。实验数据表明，拉伸应变可以使电容电位正向移动。更重要的是，当机械拉伸时，放电时间（一种材料的能量存储性能的重要代表参数）缩短了。这种现象表明，比电容与应变有关，而拉伸应变会降低碳布的比电容。这种依赖性可以归因于当碳布被机械拉伸时其表面自由能的变化。外部机械加工不仅可以在具有特定晶格结构的金属或金属氧化物表面上，而且可以在非晶材料的表面上调制典型的电容过程。