Accelerated Water Dissociation Kinetics By Electron- Enriched Cobalt Sites for Efficient Alkaline Hydrogen Evolution

Dai Qizhou; Wang Lin; Wang KexinSang XiahanLi ZhongjianYang BinChen JianmengLei LechengDai LimingHou Yang

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Accelerated Water Dissociation Kinetics By Electron- Enriched Cobalt Sites for Efficient Alkaline Hydrogen Evolution

机译：Accelerated Water Dissociation Kinetics By Electron- Enriched Cobalt Sites for Efficient Alkaline Hydrogen Evolution

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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.

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来源
《Advanced functional materials》 |2022年第12期|2109556.1-2109556.10|共10页
作者
Dai Qizhou; Wang Lin; Wang KexinSang XiahanLi ZhongjianYang BinChen JianmengLei LechengDai LimingHou Yang;
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作者单位

Zhejiang Univ Technol, Coll Environm, Inst Environm Biol & Catalysis, Hangzhou 310014, Zhejiang, Peoples R China;

Zhejiang Univ Technol, Coll Environm, Inst Environm Biol & Catalysis, Hangzhou 310014, Zhejiang, Peoples R China|Zhejiang Univ, Coll Chem & Biol Engn, Minist Educ, Key Lab Biomass Chem Engn, Hangzhou 310027, Peoples R China;

Zhejiang Univ, Coll Chem & Biol Engn, Minist Educ, Key Lab Biomass Chem Engn, Hangzhou 310027, Peoples R ChinaWuhan Univ Technol, Sch Mat Sci & Engn, Res & Testing Ctr Mat, Wuhan 430070, Peoples R ChinaZhejiang Univ, Coll Chem & Biol Engn, Minist Educ, Key Lab Biomass Chem Engn, Hangzhou 310027, Peoples R China|Inst Zhejiang Univ Quzhou, Quzhou 324000, Peoples R ChinaUniv New South Wales, Sch Chem Engn, Australian Carbon Mat Ctr CMC, Sydney, NSW 2052, Australia;

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正文语种英语
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alkaline hydrogen evolution; electron-enriched cobalt sites; water dissociation kinetics; Zn-H2O batteries;

Accelerated Water Dissociation Kinetics By Electron- Enriched Cobalt Sites for Efficient Alkaline Hydrogen Evolution

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