EnhancedElectrolyte Ion Penetration in Microdome-likeGraphene with High Mass Loading for High-Performance Flexible Supercapacitors

Achieving an excellent electrochemical performance of graphene electrodes with high mass loading is challenging to graphene-based supercapacitors. Generally, the high mass loading of graphene usually results in drastic restacking/aggregation, which further significantly deteriorates the penetration of electrolyte ions. Herein, we attempted to synthesize a kind of microdome-like graphene by CVD on unique natural coral templates. More importantly, these microdome-like graphene materials are able to support the axle and absorb shock from the compression, effectively preventing the aggregations of graphene in the compressed free-standing electrodes for enhancing the electrolyte ion penetration. Additionally, according to Trasatti’s theory, the non-diffusion-controlled capacitive process is primary even at a high areal mass loading of 20.2 mg/cm2, which is caused by more electrolyte ions accessible surfaces in the compressed electrode. Therefore, this unique microdome-like graphene leads to robust electrolyte ...