标题: NiSe/Ni3Se2 on nickel foam as an ultra-high-rate HER electrocatalyst: common anion heterostructure with built-in electric field and efficient interfacial charge transfer
作者: Ma, X (Ma, Xin); Yang, JB (Yang, Jingbo); Xu, XQ (Xu, Xiaoqi); Yang, HQ (Yang, Hangqi); Peng, C (Peng, Chuang)
来源出版物: RSC ADVANCES 卷: 11 期: 55 页: 34432-34439 DOI: 10.1039/d1ra06183f 出版年: OCT 25 2021
摘要: One grand challenge in green hydrogen production is to design efficient HER electrocatalysts for high-rate alkaline water electrolysis. Nickel chalcogenide coatings on nickel foam (NF) are promising HER electrocatalysts, but their high-rate performances are yet to be improved. The current work reports a NiSe/Ni3Se2@NF for alkaline HER, which requires an overpotential of only 336 mV to achieve an ultra-high current density of 1250 mA cm(-2), outperforming commercial Pt/C. The low onset potential of NiSe/Ni3Se2@NF is attributed to its morphology, and high surface area, as well as multiple active sites and electronic structure modulation because of the heterostructure. While these features are well-known within the current knowledge framework, new understandings are proposed on its superior high-rate performance. The common-anion feature offers abundant interfacial Ni-Se bonding and low resistance for efficient interfacial charge transfer, whereas the heterovalent-Ni-cation in the heterostructure results in a built-in electric field that further enhances the high-rate performance. This work provides new insights on both the mechanistic and methodological aspects of designing high-performance electrocatalysts operating at high current densities.
地址: [Ma, Xin; Yang, Jingbo; Xu, Xiaoqi; Yang, Hangqi; Peng, Chuang] Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Peoples R China.
通讯作者地址: Peng, C (通讯作者)，Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430072, Peoples R China.
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