Improved Electrochemical Alkaline Seawater Oxidation over Cobalt Carbonate Hydroxide Nanowire Array by Iron Doping

Constructing efficient and low-cost oxygen evolutionreaction (OER)catalysts operating in seawater is essential for green hydrogen productionbut remains a great challenge. In this study, we report an iron dopedcobalt carbonate hydroxide nanowire array on nickel foam (Fe-CoCH/NF)as a high-efficiency OER electrocatalyst. In alkaline seawater, suchFe-CoCH/NF demands an overpotential of 387 mV to drive 500 mA cm(-2), superior to that of CoCH/NF (597 mV). Moreover,it achieves excellent electrochemical and structural stability inalkaline seawater. Fe-CoCH/NF is paired withPt/C/NF, forming a two-electrodeelectrolytic cell, only requiring a cell voltage of 1.76 V to obtaina large current density of 100 mA cm(-2) in alkalineseawater, superior to RuO2/NF & PAR;Pt/C/NF.

Automated summary

In this study, an iron doped cobalt carbonate hydroxide nanowire array on nickel foam (Fe-CoCH/NF) was reported as a high-efficiency oxygen evolution reaction (OER) electrocatalyst in seawater. It exhibited a lower overpotential and better stability compared to CoCH/NF in alkaline seawater. When paired with Pt/C/NF, it achieved a large current density with a low cell voltage in alkaline seawater, surpassing RuO2/NF & PAR;Pt/C/NF.