双金属片
光催化
普鲁士蓝
催化作用
材料科学
熔盐
石墨氮化碳
制氢
溶解
化学工程
过渡金属
贵金属
氮化碳
盐(化学)
碳纤维
镍
金属
无机化学
化学
冶金
有机化学
电化学
复合材料
物理化学
电极
复合数
工程类
作者
Qiaona Liu,Han Xiao,An Qian,Xin Pu,Lei Ye,Jichang Liu,Jian Zhang,Jingwen Zhan
标识
DOI:10.1016/j.jallcom.2023.173371
摘要
The development of highly active and stable cocatalysts using earth-abundant transition metals to replace noble metals is important for the application of photocatalytic hydrogen production technology. In this study, two-dimensional (2D) carbon-encapsulated NiCo bimetallic nanosheets (NiCo@C) was designed for the first time as a new co-catalyst to synergistically combine with graphitic carbon nitride (g-C3N4) and promote its hydrogen evolution. The NiCo@C cocatalysts were using an innovative molten salt method by using nickel hexacyanocobaltate Ni3[Co(CN)6]2 (Ni-Co PBA) nanocubes as precursor. The Ni-Co PBA nanocubes undergo dissolution growth and salt templating processes to form bimetallic 2D nanosheets during charring in molten salt media, and combine with 2D g-C3N4 to form NiCo@C/g-C3N4 photocatalyst. The optimized NiCo@C/g-C3N4 photocatalyst significantly improved the H2 evolution activity, and the H2 evolution rate reached 3791.07 μmol·g-1·h-1, which was 5 times higher than that of the particle CoNi/g-C3N4 (636.89 μmol·g-1·h-1). The H2 evolution activity was also comparable to that of the photocatalytic activity of 1.0% Pt/g-C3N4 system, indicating that the earth-abundant NiCo@C can replace noble metal as a cocatalyst to significantly enhance the photocatalytic performance of 2D photocatalysts. The conversion of three-dimensional Ni-Co PBA into carbon-coated 2D metal nanosheets by molten salt-assisted pyrolysis provides a feasible approach to explore the synthesis and design of efficient and robust non-precious metal catalysts.
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