In situ Cobalt-Cobalt Oxide/N-Doped Carbon Hybrids As Superior Bifunctional Electrocatalysts for Hydrogen and Oxygen Evolution

被引:1628
作者
Jin, Haiyan [1 ]
Wang, Jing [1 ]
Su, Diefeng [1 ]
Wei, Zhongzhe [1 ]
Pang, Zhenfeng [1 ]
Wang, Yong [1 ]
机构
[1] Zhejiang Univ, Adv Mat & Catalysis Grp, ZJU NHU United R&D Ctr,Dept Chem, Ctr Chem High Performance & Novel Mat,Key Lab App, Hangzhou 310028, Peoples R China
基金
中国国家自然科学基金;
关键词
MOS2 ULTRATHIN NANOSHEETS; MOLYBDENUM CARBIDE; WATER OXIDATION; SYNERGISTIC CATALYST; CO3O4; NANOCRYSTALS; NANOWIRE ARRAYS; EFFICIENT; GRAPHENE; PERFORMANCE; NITRIDE;
D O I
10.1021/ja5127165
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Remarkable hydrogen evolution reaction (HER) or superior oxygen evolution reaction (OER) catalyst has been applied in water splitting, however, utilizing a bifunctional catalyst for simultaneously generating H-2 and O-2 is still a challenging issue, which is crucial for improving the overall efficiency of water electrolysis. Herein, inspired by the superiority of carbon conductivity, the propitious H atom binding energy of metallic cobalt, and better OER activity of cobalt oxide, we synthesized cobalt-cobalt oxide/N-doped carbon hybrids (CoOx@CN) composed of Co-0, CoO, Co3O4 applied to HER and OER by simple one-pot thermal treatment method. CoOx@CN exhibited a small onset potential of 85 mV, low charge-transfer resistance (41 Omega), and considerable stability for HER. Electrocatalytic experiments further indicated the better performance of CoOx@CN for HER can be attributed to the high conductivity of carbon, the synergistic effect of metallic cobalt and cobalt oxide, the stability of carbon-encapsulated Co nanoparticles, and the introduction of electron-rich nitrogen. In addition, when used as catalysts of OER, the CoOx@CN hybrids required 0.26 V overpotential for a current density of 10 mA cm(-2), which is comparable even superior to many other non-noble metal catalysts. More importantly, an alkaline electrolyzer that approached similar to 20 mA cm(-2) at a voltage of 1.55 V was fabricated by applying CoOx@CN as cathode and anode electrocatalyst, which opened new possibilities for exploring overall water splitting catalysts.
引用
收藏
页码:2688 / 2694
页数:7
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