02108nas a2200193   4500008004100000022001400041245010900055210006900164260000800233300001400241490000600255520140400261100003001665700003001695700002001725700001601745700002801761856012501789       2022                        eng d  a2398-490200aWell-defined hierarchical teddy bear sunflower-like NiCo2O4 electrocatalyst for superior water oxidation0 aWelldefined hierarchical teddy bear sunflowerlike NiCo2O4 electr  cDEC  a5491-55020 v63 a<p>
	The development of a robust and efficient electrocatalyst for water oxidation is challenging due to the large overpotential requirement to transfer four electrons. Herein, a novel spinel-type hierarchical teddy bear sunflower-like NiCo2O4 electrocatalyst was synthesized through the facile solvothermal process and evaluated for the challenging and demanding oxygen evolution reaction (OER) in the water electrolysis process. The teddy bear sunflower-like NiCo2O4 supported on nickel foam (NF) delivers a current density of 50 mA cm(-2) at a small water oxidation overpotential (eta(50) = 319 mV) which is significantly lower than that of the corresponding spherical NiO/NF (eta(50) = 338 mV), and sea-urchin like Co3O4/NF (eta(50) = 357 mV). A large specific and electroactive surface area, as well as a high TOF value exhibited by the hierarchical teddy bear sunflower-like NiCo2O4 electrocatalyst, demonstrates the potential of NiCo2O4 to catalyze the water oxidation reaction efficiently. The impact of the near-Fermi-level d-orbital states in NiCo2O4 electrocatalyst for boosting OER activity was unveiled by the density functional theory calculation. The stable performance even after 16 h and high catalyst utilization of the hierarchical teddy bear sunflower-like NiCo2O4 through the OER indicates that the catalyst is highly suitable for the large-scale water oxidation process.</p>
1 aBodhankar, Pradnya, M. M.1 aDhawale, Dattatray, S. S.1 aGiddey, Sarbjit1 aKumar, Ravi1 aSarawade, Pradip, B. B.  uhttps://library.ncl.res.in/content/well-defined-hierarchical-teddy-bear-sunflower-nico2o4-electrocatalyst-superior-water