能源化学(英文版)

能源化学(英文) ›› 2019, Vol. 28 ›› Issue (7): 161-170.DOI: 10.1016/j.jechem.2018.09.015

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Electrocatalytic water splitting at nitrogen-doped carbon layers-encapsulated nickel cobalt selenide

Chuanlai Jiao, Xiangjie Bo, Ming Zhou   

  1. Key Laboratory of Nanobiosensing and Nanobioanalysis at Universities of Jilin Province, Key Laboratory of Polyoxometalate Science of Ministry of Education, National & Local United Engineering Laboratory for Power Batteries, Department of Chemistry, Northeast Normal University, Changchun 130024, Jilin, China
  • 收稿日期:2018-06-28 修回日期:2018-09-12 出版日期:2019-07-15 发布日期:2019-07-15
  • 通讯作者: Xiangjie Bo, Ming Zhou
  • 基金资助:
    The authors gratefully acknowledge the financial support by the National Natural Science Foundation of China (21605015), the Development Project of Science and Technology of Jilin Province (20170101176JC), the Fundamental Research Funds for the Central Universities (2412017BJ003), the Recruitment Program of Global Youth Experts, the Jilin Provincial Department of Education, and the start-up funds from Northeast Normal University.

Electrocatalytic water splitting at nitrogen-doped carbon layers-encapsulated nickel cobalt selenide

Chuanlai Jiao, Xiangjie Bo, Ming Zhou   

  1. Key Laboratory of Nanobiosensing and Nanobioanalysis at Universities of Jilin Province, Key Laboratory of Polyoxometalate Science of Ministry of Education, National & Local United Engineering Laboratory for Power Batteries, Department of Chemistry, Northeast Normal University, Changchun 130024, Jilin, China
  • Received:2018-06-28 Revised:2018-09-12 Online:2019-07-15 Published:2019-07-15
  • Contact: Xiangjie Bo, Ming Zhou
  • Supported by:
    The authors gratefully acknowledge the financial support by the National Natural Science Foundation of China (21605015), the Development Project of Science and Technology of Jilin Province (20170101176JC), the Fundamental Research Funds for the Central Universities (2412017BJ003), the Recruitment Program of Global Youth Experts, the Jilin Provincial Department of Education, and the start-up funds from Northeast Normal University.

摘要： Generally, the catalytic overpotentials of hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) are unavoidable because of the low charge transfer. In this work, two strategies of alloying of Co with Ni and enclosing of electrocatalysts with carbonaceous materials were both used to accelerate the catalytic efficiency of cobalt selenide for water splitting. The nitrogen-doped carbon (NC) layer improves the reaction kinetics by efficient charge transfer. The alloying of metal into composited electrocatalysts can modify the electronic properties of host materials, thereby tuning the adsorption behavior of intermediate and improving the electrocatalytic activity. As expected, Nyquist plots reveal that the charge-transfer resistance (Rct) of nickel cobalt selenide encapsulated into nitrogen-doped carbon layer (CoNiSe/NC-3, Co:Ni=1:1) are just 5 and 9Ω for HER and OER, respectively, which are much lower than those of CoSe/NC-1 (Co:Ni=1:0) (81 and 138Ω) and CoNiSe/NC-3 without NC (CoNiSe-3) (54 and 25Ω). With the high charge transfer and porous structure, CoNiSe/NC-3 shows good performance for both HER and OER. When current density reaches 10 mA cm-2, only 100 and 270 mV overpotentials are required for HER and OER, respectively. With the potential of 1.65 V, full water splitting also can be catalyzed by CoNiSe/NC-3 with current density of 20 mA cm-2, suggesting that CoNiSe/NC-3 could be used as replacement for noble metal electrocatalysts.

关键词: Nickel cobalt selenide, Nitrogen-doped carbon layer, Water splitting, Hydrogen evolution reaction, Oxygen evolution reaction

Abstract: Generally, the catalytic overpotentials of hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) are unavoidable because of the low charge transfer. In this work, two strategies of alloying of Co with Ni and enclosing of electrocatalysts with carbonaceous materials were both used to accelerate the catalytic efficiency of cobalt selenide for water splitting. The nitrogen-doped carbon (NC) layer improves the reaction kinetics by efficient charge transfer. The alloying of metal into composited electrocatalysts can modify the electronic properties of host materials, thereby tuning the adsorption behavior of intermediate and improving the electrocatalytic activity. As expected, Nyquist plots reveal that the charge-transfer resistance (Rct) of nickel cobalt selenide encapsulated into nitrogen-doped carbon layer (CoNiSe/NC-3, Co:Ni=1:1) are just 5 and 9Ω for HER and OER, respectively, which are much lower than those of CoSe/NC-1 (Co:Ni=1:0) (81 and 138Ω) and CoNiSe/NC-3 without NC (CoNiSe-3) (54 and 25Ω). With the high charge transfer and porous structure, CoNiSe/NC-3 shows good performance for both HER and OER. When current density reaches 10 mA cm-2, only 100 and 270 mV overpotentials are required for HER and OER, respectively. With the potential of 1.65 V, full water splitting also can be catalyzed by CoNiSe/NC-3 with current density of 20 mA cm-2, suggesting that CoNiSe/NC-3 could be used as replacement for noble metal electrocatalysts.

Key words: Nickel cobalt selenide, Nitrogen-doped carbon layer, Water splitting, Hydrogen evolution reaction, Oxygen evolution reaction