In Situ Growth of CoMnPOxHy for Oxygen Evolution Reaction by Cobalt-Modified Commercial Manganese Phosphating and Electrochemical Activation

In situ growth of catalysts has great advantages compared with the conventional powder-type catalysts, which require extra casting procedures with polymeric binders. Here, fabrication of an electrode with a binder-free electrocatalyst is presented, inspired by an already commercialized chemical engineering process, phosphating, which has been widely utilized in the surface treatment industry. The CoMnP i is formed on a conductive substrate using Co 2+ -modified phosphating. The CoMnP i is converted into layered-type, amorphous CoMnPO x H y by electrochemical activation, which is active toward the oxygen evolution reaction (OER). Our phosphating-based method greatly simplifies the preparation procedure of electrodes for water electrolyzers, possibly resulting in wide utilization of H 2 .