Oxygen functional groups modified amorphous hollow carbon bowls for pseudocapacitive Zn-ion storage

Carbon is a promising capacitive electrode material for Zn-ion hybrid supercapacitors (ZHSCs), as it is low-cost, environmentally friendly, controllable and adjustable. By now, achieving both high energy and high power with carbon electrodes is still challenging, limited by their intrinsic properties. In this work, we have designed and presented an amorphous hollow carbon bowl material with surface chemical modifications of oxygen groups to figure out these concerns. The preparation of bowl-like structures and the storage behavior between Zn²⁺ and oxygen functional groups have also been discussed. With the contributions from its unique hollow structure and surface functional groups, it can significantly enhance the electrode pseudocapacitance and the entire electrochemical performance.