Cobalt Electrocatalyst on Fluorine Doped Carbon Cloth – a Robust and Partially Regenerable Anode for Water Oxidation

Abstract The low stability of the electrocatalysts at water oxidation (WO) conditions and use expensive noble metals have obstructed large‐scale H 2 production from water. Herein, we report electrocatalytic WO activity a cobalt‐containing, water‐soluble molecular electrocatalyst [Co II (mcbp)(OH )] ( 1 ) [mcbp 2− =2,6‐bis(1‐methyl‐4‐(carboxylate)benzimidazol‐2‐yl)pyridine] in homogeneous (overpotential 510 mV pH 7 phosphate buffer) after anchoring it on pyridine‐modified fluorine‐doped carbon cloth (PFCC). formation cobalt was identified only 4 h continuous oxygen evolution conditions. Interestingly, significant enhancement (current density 5.4 mA/cm 1.75 V) observed for onto PFCC, resulting turnover (TO) >3.6×10 3 average TOF 0.05 s −1 1.55 V (pH 7) over 20 h. A total TO >21×10 8 days calculated. electrode allowed regeneration of∼ 85 % electrochemically 36 evolution.