Journal
IONICS
Volume 24, Issue 6, Pages 1773-1780Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11581-017-2323-3
Keywords
CoNi alloy; Metal organic framework; Water splitting, electrocatalyst; Oxygen evolution reaction
Funding
- LaSPACE
- LSU Economic Development Assistantship
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The major challenge of electrocatalytic water splitting for hydrogen production is the sluggish kinetics of oxygen evolution reaction (OER). Herein, we report a facile synthesis of CoNi alloy embedded carbon nanocages (CoNi-C) through one-step annealing treatment of bimetallic organic frameworks as the precursors for application as efficient and economical electrocatalysts for OER. As a result, the optimized CoNi-C-200 sample with a Co/Ni atomic ratio of 9:1 exhibits a lower overpotential of 408 mV at a current density of 10 mA cm(-2) and a smaller Tafel slope of 83 mV dec(-1) compared to as-prepared CoNi-C-100 (410 mV, 93 mV dec(-1)), CoNi-C-400 (420 mV, 94 mV dec(-1)), and Co-C (447 mV, 97 mV dec(-1)). Moreover, it shows an excellent long-term stability during 5000 CV sweeps. Such improved performance can be attributed to the unique morphology and the synergistic effects of CoNi alloy nanoparticles and conductive carbon matrix in the composite.
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