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

ABSTRACT: 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 (?-FeOOH) with controlled Co/Fe ratios [Co x Fe1-x OOH (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 (?) 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 ?-FeOOH required ? = 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 cost-effective and high-performance catalysts for the OER in alkaline solution.

SUBMITTER: Inohara D 

PROVIDER: S-EPMC6644471 | biostudies-literature | 2018 Jul

REPOSITORIES: biostudies-literature