期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 294, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2021.120263
关键词
CuNi@Ni core@shell material; 3D CNTs-graphene hybrid; Bifunctional electrocatalyst; Overall water splitting; O; N dual coordination
资金
- Regional Leading Research Center Program [2019R1A5A8080326]
- BRL Program through the National Research Foundation (NRF) - Ministry of Science and ICT, Republic of Korea [2020R1A4A1018259]
- National Research Foundation of Korea [2020R1A4A1018259] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Through an effective synthesis process, a unique nanohybrid material CuNi@Ni(ON)/CNTs-Gr was designed, showing remarkable bifunctional activities for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in 1.0 M KOH. The material exhibited small overpotential values at high current responses and delivered a high cell voltage in an electrolyzer, surpassing the performance of a commercial Pt/C//RuO2-based system. These achievements position CuNi@Ni(ON)/CNTs-Gr as one of the most effective nonprecious catalysts for high-performance green hydrogen gas production via water splitting.
Herein, a unique nanohybrid, in which CuNi@Ni core@shell nanoparticles were dual-coordinated with oxygen and nitrogen heteroatoms (CuNi@Ni(ON) NPs) and uniformly assembled on 3D porous carbon nanotubesgraphene (CNTs-Gr), was well-designed via an effective synthesis process. The CuNi@Ni(ON)/CNTs-Gr material with tunable electronic properties and conductivity displayed favorite adsorption energies towards reactants, thus manifesting its remarkable bifunctional activities for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) operating in 1.0 M KOH. To achieve current responses of 10 and 100 mA cm-2, small overpotential values of 42.1 and 410 mV were needed for HER and OER, respectively. An electrolyzer employing CuNi@Ni(ON)/CNTs-Gr electrodes delivered an exciting cell voltage of 1.51 V at 10 mA cm-2 and good stability over 25 h operation, surpassing performance of a commercial Pt/C//RuO2-based system. These achievements suggested the CuNi@Ni(ON)/CNTs-Gr is one of the most effective nonprecious catalysts for high-performance production of green hydrogen gas via water splitting.
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