Integrating energy-saving hydrogen production with methanol electrooxidation over Mo modified Co4N nanoarrays

被引:59
作者
Wang, Tongzhou [1 ]
Cao, Xuejie [1 ]
Qin, Hongye [1 ]
Chen, Xuchun [1 ]
Li, Jinhong [1 ]
Jiao, Lifang [1 ]
机构
[1] Nankai Univ, Coll Chem, Renewable Energy Convers & Storage Ctr ReCast, Key Lab Adv Energy Mat Chem,Minist Educ, Tianjin 300071, Peoples R China
基金
中国国家自然科学基金;
关键词
NITROGEN-DOPED CARBON; WATER OXIDATION; EFFICIENT; PERFORMANCE; EVOLUTION;
D O I
10.1039/d1ta05894k
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The intrinsically sluggish kinetics of the anodic oxygen evolution reaction (OER) is deemed to be the bottleneck for highly efficient electrocatalytic hydrogen production, and the by-product is less value-added oxygen. Herein, we report rational construction of Mo doped Co4N nanoarrays (Mo-Co4N) with an open skeleton structure as a robust bifunctional electrocatalyst for concurrent electrolytic high-purity hydrogen and value-added formate productions in the cathodic and anodic process. Benefitting from Mo doping, the unique structure characteristics of more exposed active sites, and optimized electronic synergy, Mo-Co4N exhibits intriguing hydrogen evolution reaction (HER) activity with an exceptionally small overpotential of 45 mV at 10 mA cm(-2) and a low Tafel slope of 42 mV dec(-1). Meanwhile, when the anodic partial methanol oxidation reaction (MOR) is used to replace the OER, the oxidation potential is significantly reduced to 1.356 V at 10 mA cm(-2). In particular, a two-electrode electrolyzer employing Mo-Co4N as a bifunctional catalyst only requires an ultralow cell voltage of 1.427 V to achieve a current density of 10 mA cm(-2), featuring low energy consumption in comparison to traditional overall water splitting. Furthermore, high Faraday efficiencies approaching 100% for hydrogen evolution and value-added formate production are achieved, as well as excellent 60 h long-term durability.
引用
收藏
页码:21094 / 21100
页数:7
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