In situ synthesis of a Bi2O3/Bi2S3 composite heterojunction for the electrochemical characterization of supercapacitors

The Bi 2 O 3 /Bi 2 S 3 synthesized in situ by a two-step hydrothermal method possesses a built-in electric field, which reduces the ion/electron exchange barrier and accelerates the ion/electron transfer rate. As a cathode, Bi 2 O 3 /Bi 2 S 3 significantly enhances electrochemical performance.