5 years ago

Performance of MOF-Derived Spinel Type NixCo3-xO4-y Nanocages in Efficient Methanol Electro-Oxidation

Performance of MOF-Derived Spinel Type NixCo3-xO4-y Nanocages in Efficient Methanol Electro-Oxidation
Rajini P. Antony, Bhagawantrao N. Jagatap, Ashis K. Satpati
The present study reports electrocatalytic activity towards methanol oxidation of mesoporous NixCo3-xO4-y fabricated through a metal-organic framework (MOF) template route. MOF-derived NixCo3-xO4-y nanocages exhibit a methanol oxidation reaction (MOR) current of approximately 200 Ag−1 at 0.55 V versus Hg-HgO, which is around 12 times higher than that from Co3O4. Improved activity for the catalyst is ascribed to its higher number of catalytic active sites and non-stoichiometry in the composition. The improved charge-transfer kinetics for the MOR is evident from the electrochemical impedance measurements, where a lower charge-transfer resistance is observed for NixCo3-xO4-y nanocages and the trend is consistent with the MOR results. The potential-dependent impedance measurements suggest that direct electrochemical MOR is facilitated through a surface intermediate, where the surface intermediates (CH3OH or CO) are adsorbed on low coordinated Ni and Co sites, respectively. I want MOR: Excellent MOR activity is observed in MOF-derived NixCo3-xO4-y, which is compared to Co3O4 and found to be superior.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/celc.201700832

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