SCHEDULED MAINTENANCE
Non-precious cobalt oxalate microstructures as highly efficient electrocatalysts for oxygen evolution reaction†
Abstract
Well-defined cobalt oxalate (CoC2O4·2H2O) microstructures with controllable morphologies have been successfully synthesized by a simple solvothermal process. The resulting CoC2O4·2H2O microrods (MRs) and micropolyhedrons (MPs) can be easily controlled by rationally tuning the composition of solvents. It is experimentally demonstrated that CoC2O4·2H2O microstructures as nonprecious metal based electrocatalysts exhibit remarkable activity for catalyzing OER in alkaline medium. Such performance is found to be closely dependent on the morphology of CoC2O4·2H2O microstructures. The MRs with higher aspect ratio and more active Co sites manifest a small OER onset potential, large anodic current and long-term durability, which are superior to the MPs, derived Co3O4 MRs, and previously reported cobalt oxalate electrocatalysts, and even compare favorably with most previously reported Co-based OER electrocatalysts.
- This article is part of the themed collection: 2015 Journal of Materials Chemistry A Hot Papers
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