2, Department of Chemistry and Materials Science, Aalto University, Aalto, , Finland
3, College of Engineering and Computing, University of South Carolina, Columbia, South Carolina, United States
4, Condensed Matter Physics Department, Jozef Stefan Institute, Ljubljana, , Slovenia
We report on a novel approach thruogh which metal-organic framework constructed on graphene platelets is converted, in situ, into highly active and durable water splitting electrocatalyst. This approach to construct highly active and durable Ni(OH)2 nanoparticle/graphene hybrid electrocatalyst utilized the Ni-loaded, graphene-supported metal-organic framework (UiO-66-NH2-Ni@G) as a sacrificial pre-catalyst to generate the true catalyst, in situ, under the electrolysis conditions. The resulted nanocatalyst was shown to enclose Ni(OH)2 nanoparticles imbeded within hydrous zirconia and deposited on top of G platelets, demonstrating a high electrochemical activity towards oxygen-evolution reaction (η10 = 0.38 V vs. RHE) and highly durable catalyst. This strategy can potentially be extended to several other systems as a less energy-demanding alternative to the commonly utilized pyrolysis pathway to generate electrocatalysts from MOFs.