Cr(OH)3nanosheets@ZIF67 electrocatalysts prepared by electrodeposition method for efficient oxygen evolution reaction


 In this paper, Cr(OH)3 NSs@ZIF67 (NSs=nanosheets) electrocatalyst was prepared on foam nickel by simple and rapid electrochemical deposition method. The excellent electrocatalysts activity of Cr(OH)3 NSs@ZIF67 are demonstrated. It can use the overpotential of 281 mV and 390 mV respectively to drive 10 mA cm-2 and 50 mA cm-2. It is observed that the Cr(OH)3 NSs@ZIF67 electrode has the highest initial current density at 1.57 V compared with other two monomer electrodes and shows excellent stability at the end of 60000 s. It has the largest electrochemical activity specific surface and lowest charge-transfer resistance, and M-O bonds (M=Co, Cr) and shifting of binding energy peaks at the interface led to the more active sites and more efficient electron transfer rate for OER. This work highlights the construction of highly efficient composite electrocatalysts composted of low-dimensional non-precious transition metal compounds and MOF, promoting the development of low-cost non-noble metal composites in energy chemistry.