Interfacial coupling of amorphous cobalt boride with g-C3N4 nanosheets for superior oxygen evolution reaction

Herein, the preparation of a novel nanostructured electrocatalyst (CoB/g-C3N4) and its performance towards oxygen evolution reaction (OER) is demonstrated. The findings indicate the existence of an effective synergy operating between amorphous CoB and g-C3N4, leading to the high electrochemically active surface area, low electrochemical impedance and charge transfer resistance. As a result, the CoB/g-C3N4 electrode requires substantially lower overpotential (360 mV) with a small Tafel slope (94.4 mV dec(-1)) as compared to bare CoB (103.5 mV dec(-1)) and g-C3N4 (140.2 mV dec(-1)) electrodes to generate the benchmark 10 mA cm(2). (C) 2020 Elsevier B.V. All rights reserved.