Enhanced Electron Transfer and Ion Transport by Binary and Multidimensional CuCo S /Fe O on Carbon Cloth for Water Oxidation.

The behavior of electron transfer and ion transport plays a significant role in the electrocatalytic activity. However, the improvement of CuCo S electrocatalytic activity has been a difficult problem owing to lack of effective electron transfer and ion transport. Herein, the unique structure connected CuCo S nanosheets and carbon cloth (CC) with Fe O nanoparticles to form CuCo S /Fe O /CC. Compared with CuCo S /CC, the resistances of electron transfer and ion transport were decreased by 65 and 84 %, respectively. The electrochemical surface area of CuCo S /Fe O /CC was 2.76 times larger than that of CuCo S /CC due to the high double-layer capacitance. For the oxygen evolution reaction, CuCo S /Fe O /CC could achieve an overpotential of 273 mV and a Tafel slope of 67 mV dec in alkaline solution.