期刊
MATERIALS TODAY PHYSICS
卷 27, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.mtphys.2022.100831
关键词
Methanol oxidation reaction; Hydrogen evolution reaction; CoTe; Methanol electrolysis; Bifunctional catalyst
资金
- National Natural Science Foundation of China [22102105, 21972124]
- Priority Academic Program Development of Jiangsu Higher Education Institution
- Six Talent Peaks Project of Jiangsu Province [XCL-070-2018]
- Guangdong Province Higher Vocational Colleges & Schools Pearl River Scholar Funded Scheme
- Guangdong Third Generation Semiconductor Engineering Technology Development Center [2020GCZX007]
This study demonstrates a low-energy input method for hydrogen production from water electrolysis via methanol-assisted electrolysis. The researchers used a novel catalyst, Pt-CoTe/NC nanospheres, which exhibited superior catalytic activity and stability. The results showed that methanol oxidation reaction and hydrogen evolution reaction were effectively promoted with the optimized Pt-CoTe/NC catalyst.
Hydrogen production from water electrolysis is seriously restricted by the high energy consumption caused by water oxidation. Herein, an effective low-energy input for hydrogen generation via methanol-assisted water electrolysis catalyzed by bifunctional Pt-CoTe/NC nanospheres is demonstrated, which can be obtained by the ZIF-67 derived CoTe/NC supported ultrafine Pt nanoparticles. The experimental and density functional theory calculation analysis indicated that the optimized electronic structure of Pt-CoTe/NC modifies the adsorption energies of the intermediate (CO and H*), which exhibits superior catalytic activity and stability for methanol oxidation reaction (MOR) and hydrogen evolution reaction (HER). For MOR, the current density of Pt-CoTe/NC-800 is 102.2 mA cm(-2), which is 3.7 times that of commercial Pt/C catalyst, and high anti-poisoning ability is also found in the CO-stripping technique. Moreover, the small overpotential of 28 mV is required to deliver a current density of 10 mA cm(-2) for HER. When the optimal Pt-CoTe/NC serves as both cathode and anode in a two -electrode electrolyzer for methanol electrolysis, a low cell potential of 0.68 V is required to reach 10 mA cm(-2), about 960 mV lower than that of water electrolysis, and the performance is also much better than that of Pt/C||Pt/C electrode system. The current work offers a robust platform of bifunctional catalyst for MOR coupled with HER for hydrogen generation.
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