Bimetal metal-organic frameworks derived Co0.4Fe0.28P and Co0.37Fe0.26S nanocubes for enhanced oxygen evolution reaction

In order to satisfy the desire of energy shortage for excellent OER catalyst, phosphide (Co0.4Fe0.28P), and sulfide (Co0.37Fe0.26S) nanocubes (NCs) were synthesized by heating CoFe-based Prussian blue analogues (CoFe-PBA) precursors under different atmosphere, respectively. The prepared Co0.4Fe0.28P and Co0.37Fe0.26S NCs have defined stoichiometry and larger surface area, which revealed excellent electrocatalytic activities toward OER in alkaline condition. Co0.4Fe0.28P and Co0.37Fe0.26S nanocubes show an excellent electrocatalytic performance for the OER in 1 M KOH, which are superior to the state-of-the-art commercialized IrOx catalyst and most of MOFs derived OER catalyst. Furthermore, we also briefly study the different electrochemical oxidation driving (EOD) influence of Co0.4Fe0.28P and Co0.37Fe0.26S NCs for exposed more active sites and further discovering that sulfides show a better driving effect. We expect to give some inspiration on the design of OER catalysts with enhanced performance, and catalysts applied in other designs of the new catalyst. (c) 2017 Published by Elsevier Ltd.