Cobalt-Doped Goethite-Type Iron Oxyhydroxide (alpha-FeOOH) for Highly Efficient Oxygen Evolution Catalysis

It is an urgent challenge to develop low-cost and high-performance catalysts for the oxygen evolution reaction (OER). We synthesized nanoparticulate electrocatalysts consisting of cobalt-doped goethite-type iron oxyhydroxide (alpha-FeOOH) with controlled Co/Fe ratios [CoxFe1-xOOH (x <= 0.20)] based on our own wet process. A Co0.20Fe0.80OOH-coated glassy carbon electrode generated a current density (j) of 10 mA cm(-2) at an overpotential (eta) as small as 383 mV (1.61 V vs the reversible hydrogen electrode) in an alkaline electrolyte, with a small Tafel slope of 40 mV dec(-1) and excellent durability, whereas pure a-FeOOH required eta = 580 mV to reach the same current density. This can be ascribed to the effect of Co doping, which resulted in an increase in electrochemically active surface area and a decrease in charge-transfer resistance. The content of cobalt, a scarce resource, in the catalyst is much smaller than those in most of the other Fe-based catalysts reported so far. Thus, this study will provide a new strategy of designing costeffective and high-performance catalysts for the OER in alkaline solution.