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A Co2P/WC Nano‐Heterojunction Covered with N‐Doped Carbon as Highly Efficient Electrocatalyst for Hydrogen Evolution Reaction
ChemSusChem ( IF 7.5 ) Pub Date : 2018-02-08 , DOI: 10.1002/cssc.201702328 Ya Gao 1 , Zhongling Lang 1 , Feiyang Yu 1 , Huaqiao Tan 1 , Gang Yan 1 , Yonghui Wang 1 , Yuanyuan Ma 1 , Yangguang Li 1
ChemSusChem ( IF 7.5 ) Pub Date : 2018-02-08 , DOI: 10.1002/cssc.201702328 Ya Gao 1 , Zhongling Lang 1 , Feiyang Yu 1 , Huaqiao Tan 1 , Gang Yan 1 , Yonghui Wang 1 , Yuanyuan Ma 1 , Yangguang Li 1
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The hydrogen evolution reaction (HER) produces clean hydrogen through an electrochemical process. However, new nonprecious‐metal electrocatalysts for the HER are required to reduce the consumption of energy. Herein, we report a new Co2P/WC nano‐heterojunction that consists of Co2P and WC composite phases coated with a few‐layer N‐doped graphitic carbon shells (Co2P/WC@NC). The composite was prepared by a one‐step annealing of the polyoxometalate Na9(NH4)5[{(B‐α‐PW9O34)Co3(OH)(H2O)2(Ale)}2Co]⋅35 H2O (Co7P6W18) and dicyandiamide (DCA). The preparation method consisted of the simultaneous phosphorization of Co and carbonization of W in a confined space to isolate a Co2P/WC nano‐heterojunction phase for the first time. Co2P/WC@NC facilitated the generation of hydrogen in the electrolysis process, which had an overpotential of only 91 mV at a current density of 10 mA cm−2 in the acid solution; an excellent HER performance (2 H++2 e−→H2) and Tafel slope (40 mV dec−1) as well as durability over a period of 50 h were achieved. Theoretical calculations showed that the Co2P, WC, and NpyridinicC dopants in the material synergistically promoted the HER activity rather than the individual constituents. Furthermore, Co2P/WC@NC nano‐heterojunctions showed good HER performance in the whole pH range of electrolytes and considerable durability in acidic media containing transition metal ions, which may attract more attention for the exploration and optimization of nano‐heterojunction catalysts for the HER.
中文翻译：
掺N掺杂碳的Co2P / WC纳米异质结作为高效的产氢反应电催化剂
氢气析出反应（HER）通过电化学过程产生干净的氢气。但是，需要用于HER的新型非贵金属电催化剂以减少能源消耗。本文中，我们报道了一种新的Co 2 P / WC纳米异质结，该涂层由涂有少量N掺杂石墨碳壳（Co 2 P / WC @ NC）的Co 2 P和WC复合相组成。将复合材料制备多金属氧酸盐的Na的一步退火9（NH 4）5 - [{（B-α-PW 9 ö 34）有限公司3（OH）（H 2 O）2（ALE）} 2 CO] ⋅35H 2 O（钴7 P 6 W 18）和双氰胺（DCA）。制备方法包括在密闭空间中同时进行Co的磷化和W的碳化，以首次分离出Co 2 P / WC纳米异质结相。Co 2 P / WC @ NC促进了电解过程中氢气的产生，在酸性溶液中的电流密度为10 mA cm -2时，其过电势仅为91 mV 。优异的性能HER（2小时+ 2ë - →H 2）和塔菲尔斜率（40毫伏癸-1）以及耐久性历时50 h的实现。理论计算表明，Co 2材料中的P，WC和N吡啶吡啶C掺杂剂协同促进HER活性，而不是单个成分。此外，Co 2 P / WC @ NC纳米异质结在电解质的整个pH范围内均表现出良好的HER性能，并且在含有过渡金属离子的酸性介质中具有显着的耐久性，这可能会引起人们对纳米异质结催化剂的探索和优化的关注。她。
更新日期：2018-02-08
中文翻译：
掺N掺杂碳的Co2P / WC纳米异质结作为高效的产氢反应电催化剂
氢气析出反应（HER）通过电化学过程产生干净的氢气。但是，需要用于HER的新型非贵金属电催化剂以减少能源消耗。本文中，我们报道了一种新的Co 2 P / WC纳米异质结，该涂层由涂有少量N掺杂石墨碳壳（Co 2 P / WC @ NC）的Co 2 P和WC复合相组成。将复合材料制备多金属氧酸盐的Na的一步退火9（NH 4）5 - [{（B-α-PW 9 ö 34）有限公司3（OH）（H 2 O）2（ALE）} 2 CO] ⋅35H 2 O（钴7 P 6 W 18）和双氰胺（DCA）。制备方法包括在密闭空间中同时进行Co的磷化和W的碳化，以首次分离出Co 2 P / WC纳米异质结相。Co 2 P / WC @ NC促进了电解过程中氢气的产生，在酸性溶液中的电流密度为10 mA cm -2时，其过电势仅为91 mV 。优异的性能HER（2小时+ 2ë - →H 2）和塔菲尔斜率（40毫伏癸-1）以及耐久性历时50 h的实现。理论计算表明，Co 2材料中的P，WC和N吡啶吡啶C掺杂剂协同促进HER活性，而不是单个成分。此外，Co 2 P / WC @ NC纳米异质结在电解质的整个pH范围内均表现出良好的HER性能，并且在含有过渡金属离子的酸性介质中具有显着的耐久性，这可能会引起人们对纳米异质结催化剂的探索和优化的关注。她。
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