Pre-straining the elastic substrate is a commonly used strategy to fabricate buckle-structured electrodes for stretchable supercapacitors, but suffer from limited stretchability due to the detachment issue from mismatched mechanical properties. To enhance the stretchability of buckled polypyrrole (PPy) electrode on elastic poly(dimethylsiloxane) (PDMS), a rough interface is employed between the substrate and deposited layers. The surface roughness of substrate is produced by a facile imprinting process from a template (e.g. sandpaper), and it is inherited in the successive sputter coated current collector (Au) and electropolymerized PPy layers. The produced buckled PPy electrode on PDMS with optimal roughness shows a stretchability of over 60%, much higher than 30% for that on smooth substrate. It can be explained by the generated inhomogeneous stress distribution under stretching preventing the propagation of cracks. The assembled stretchable supercapacitors with buckled PPy electrodes can retain 88% of its initial capacitance after being stretched for 1000 cycles at a high strain of 50%.

预应变弹性基板是制造用于可拉伸超级电容器的带扣结构的电极的常用策略，但是由于不匹配的机械性能引起的分离问题，其可拉伸性受到限制。为了增强弹性聚（二甲基硅氧烷）（PDMS）上的弯曲聚吡咯（PPy）电极的可拉伸性，在基材和沉积层之间采用了粗糙的界面。基材的表面粗糙度是通过模板（例如砂纸）通过轻松的压印过程产生的，并且在连续的溅射涂覆的集电器（Au）和电聚合的PPy层中具有继承性。在PDMS上生产的具有最佳粗糙度的弯曲PPy电极，其可拉伸性超过60％，远远高于在光滑基材上的30％。这可以通过在拉伸下产生的不均匀应力分布来解释，从而防止裂纹扩展。具有弯曲的PPy电极的组装式可拉伸超级电容器在50％的高应变下拉伸1000次循环后可以保留其初始电容的88％。