Three-dimensional open CoMoOx/CoMoSx/CoSx nanobox electrocatalysts for efficient oxygen evolution reaction

 Hui Xu^a , Hongyuan Shang^a , Cheng Wang^a , Liujun Jin^a , Chunyan Chen^a , Chuanyi Wang^b , Yukou Du^a*（杜玉扣）

^a College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, PR China

^b School of Environmental Science and Engineering, Shaanxi University of Science and Technology, Xian 710021, PR China

Applied Catalysis B: Environmental 265 (2020) 118605

Electrocatalytic oxygen evolution reaction (OER) based on geometric structure and interfacial-site engineering of catalysts is an excellent strategy for the hydrogen production by water electrolysis. Herein, a novel class of three-dimensional (3D) CoMoO_x/CoMoS_x/CoS_x (CoMoOS) nanoboxes (NBs) electrocatalysts with abundant interfaces is designed through a facile dissolution-regrowth and ion-exchange process employing ZIF-67 as the sacrificial template. Remarkably, the rich interfaces not only endow the CoMoOS with a high surface active area but also provide a “highway” for charge transport, thereby optimizing the binding strength of reaction intermediates on CoMoOS and drastically boosting the oxygen production. More interestingly, the unique nanobox structure also endows the catalyst with a 3D accessibility for reactants. As a result, the 3D CoMoOS NBs achieve not only an ultralow overpotential of 281 mV at 10 mA cm⁻², but also high-performance overall water electrolysis at alkaline media, with a cell potential of 1.58 V at 10 mA cm⁻².

链接：https://www.sciencedirect.com/science/article/pii/S0926337320300205