Journal
MATERIALS RESEARCH BULLETIN
Volume 116, Issue -, Pages 98-105Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2019.04.016
Keywords
Nickel-cobalt oxide; Electrocatalyst; Oxygen evolution reaction; Hydrogen evolution reaction; Water splitting
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Funding
- DST-FIST [SR/FST/CST-266/2015(c)]
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Herein, we demonstrate a highly efficient and stable bi-functional electrode based on flower-like hierarchical nanoporous nickel-cobalt oxide (NP-NiCo2O4) material for electrochemical water splitting reactions. The as synthesized spinel crystalline nanoporous-NiCo2O4 material enables improved electrocatalytic activity towards both water oxidation and reduction by taking the advantageous of hierarchical nanoporous structure, improved active sites, and electrochemical active surface area, high charge-transfer kinetics and structural durability. The bi-functional NiCo2O4 electrode exhibits augmented current densities and electrode durability with a high mass activity and low overpotential in overall water splitting in alkaline solution, comparable with most of the previously reported Earth-abundant transition metal oxide based catalysts. Based on our discovery in the present investigation we suggest that the flower-like hierarchical nanoporous NiCo2O4 Earth-abundant transition metal oxide electrode would certainly function as a new class of nanomaterials for competent electrochemical bi-functional water splitting catalysts.
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