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- Title
Accelerated Water Dissociation Kinetics By Electron‐Enriched Cobalt Sites for Efficient Alkaline Hydrogen Evolution.
- Authors
Dai, Qizhou; Wang, Lin; Wang, Kexin; Sang, Xiahan; Li, Zhongjian; Yang, Bin; Chen, Jianmeng; Lei, Lecheng; Dai, Liming; Hou, Yang
- Abstract
Sluggish water dissociation kinetics in the Volmer step on platinum‐free electrocatalysts limits the development of hydrogen evolution from economical water‐alkali electrolyser. Herein, an unusual nanosheets electrocatalyst of molybdenum‐doped cobalt selenide with selenium vacancy encapsulated within N‐doped carbon matrix (Mo‐Co0.85SeVSe/NC) for efficient hydrogen evolution reaction (HER) is reported. Benefiting from the optimized electronic structure, this Mo‐Co0.85SeVSe/NC nanosheet exhibits a high catalytic activity for alkaline HER, achieving the current densities of 10 and 200 mA cm−2 at low overpotentials of 151 and 275 mV, respectively. These results are among the highest catalytic activities in respect with all previously reported transition‐metal‐selenide based HER electrocatalysts. The combined in situ spectroscopic and theoretical studies reveal that the incorporation of Mo‐dopant and Se vacancies into Co0.85Se efficiently enhances electron transfer from Mo to Co atom through the bridging Se atom, leading to the formation of enriched electronic Co site to accelerate water dissociation, eventually facilitating the overall alkaline HER process. An integrated Zn‐H2O battery with a Mo‐Co0.85SeVSe/NC cathode is developed to further demonstrate the potential applications of the newly developed HER catalyst.
- Subjects
OXYGEN evolution reactions; HYDROGEN evolution reactions; MOLYBDENUM; COBALT; CATALYTIC activity; HYDROGEN; CHARGE exchange; ELECTRONIC structure
- Publication
Advanced Functional Materials, 2022, Vol 32, Issue 12, p1
- ISSN
1616-301X
- Publication type
Article
- DOI
10.1002/adfm.202109556