Journal
INORGANIC CHEMISTRY
Volume 59, Issue 22, Pages 16690-16702Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.inorgchem.0c02680
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Funding
- UGC
- Department of Science and Technology [DST/TMD/HFC/2K18/60]
- institute OM [18-29-03/(31/19)-TTBD-CSIR-CECRI]
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Catalyst development for the efficient direction of electrocatalytic water splitting with much less overpotential is crucial for meeting large-scale hydrogen generation. Being highly abundant and cost-effective, 3d transition-metal-based catalysts show promising activities in alkaline conditions. In this work, bimetallic nickel-cobalt carbonate hydroxide hydrate (NiCo-CHH) was prepared by a co-precipitation method with varying molar ratios of Ni/Co of 0.5:1, 1:1, and 1.5:1, which were analyzed for oxygen evolution reaction (OER) study in both alkaline (1 M KOH) and near-neutral (1 M NaHCO3) media. For OER in 1 M KOH, NiCoCHH 1:1 required overpotential of just 238 mV at 10 mA cm(-2) current density compared to other ratios of 0.5:1 and 1.5:1, which required 290 and 308 mV, respectively. Similarly, in 1 M NaHCO3, NiCoCHH 1:1 required an overpotential of 623 mV to reach 10 mA cm(-2). A post-OER study confirmed the formation of NiOOH during OER The observed faradaic efficiency was nearly 95.21% for the NiCoCHH 1:1 catalyst. A two-electrode setup with NiCoCHH 1:1 parallel to Pt required just 312 mV as an overpotential at 10 mA cm(-2). These kinds of comparative studies can be used in other 3d transition-metal-based catalysts for OER in the future.
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