Journal
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
Volume 8, Issue 19, Pages 7414-7422Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.0c01450
Keywords
Overpotential; UOR; HER; Bifunctional; Metal-organic rameworks (MOFs)
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Funding
- National Natural Science Foundation of China [21205030]
- Key Project of Hubei Provincial Education Department [D20171001]
- Hubei Key Laboratory of Ferro & Piezoelectric Materials and Devices [201710]
- 111 Project [B12015]
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Developing bifunctional catalysts toward urea oxidation and hydrogen evolution is a huge challenge. In this study, novel MOF-derived nickel nitride on nickel foam catalysts were successfully synthesized at different temperatures (300, 350, 400 degrees C) (denoted as C-T, T = 300, 350, 400). C-350 was demonstrated to be a highly active and durable 3D catalyst toward urea oxidation reaction (UOR), with a required potential of 1.337 V at 10 mA/cm(2). At the same time, C-350 has higher catalytic performance toward hydrogen evolution reaction (HER) than other materials with a low overpotential of 47 mV at 10 mA/cm(2). Furthermore, its two-electrode alkaline electrolyzer only needs a voltage of 1.503 V to obtain 100 mA/cm(2), which is 0.160 V lower than that of pure water splitting. Also, the current density can be maintained for at least 24 h, showing its potential for practical applications.
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