Encapsulating Co2P@C Core-Shell Nanoparticles in a Porous Carbon Sandwich as Dual-Doped Electrocatalyst for Hydrogen Evolution
Encapsulating Co2P@C Core-Shell Nanoparticles in a Porous Carbon Sandwich as Dual-Doped Electrocatalyst for Hydrogen Evolution
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将 Co2P@C 核壳纳米颗粒封装在多孔碳三明治中作为析氢双掺杂电催化剂
DOI：
10.1002/cssc.201701705
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发表时间：
2018
期刊：
影响因子：
8.4
通讯作者：
Li Rong
中科院分区：
文献类型：
--
作者：
Yang Yuanyuan;Liang Xiongyi;Li Feng;Li Shuwen;Li Xinzhe;Ng Siu Pang;Wu Chi Man Lawrence;Li Rong
采用简单的两步水热碳化和热解方法，将零维N、P双掺杂核壳Co2P@C纳米粒子嵌入到三维 -D多孔碳三明治(Co2P@N，P-C/CG)中，合成了一种高效、pH通用的三明治结构析氢反应电催化剂。由于N，P双掺杂Co2P@C核壳结构和三明治-纳米结构衬底之间的协同作用，界面电子转移速率和活性中心数目增加。高比表面积和大孔径的存在改善了传质动力学。该纳米杂化材料在较宽的pH范围内对HER具有显著的电催化活性，且具有良好的稳定性。计算研究和实验表明，Co2P@N，P-C壳层上N和P掺杂附近的碳原子是HER催化的有效活性中心，Co2P和N，P掺杂都能产生H在活性中心上的最佳结合自由能。
A highly efficient and pH‐universal hydrogen evolution reaction (HER) electrocatalyst with a sandwich‐architecture constructed using zero‐dimensional N‐ and P‐dual‐doped core–shell Co2P@C nanoparticles embedded into a 3 D porous carbon sandwich (Co2P@N,P‐C/CG) was synthesized through a facile two‐step hydrothermal carbonization and pyrolysis method. The interfacial electron transfer rate and the number of active sites increased owing to the synergistic effect between the N,P‐dual‐doped Co2P@C core–shell and sandwich‐nanostructured substrates. The presence of a high surface area and large pore sizes improved the mass‐transfer dynamics. This nanohybrid showed remarkable electrocatalytic activity toward the HER in a wide pH range with good stability. The computational study and experiments revealed that the carbon atoms close to the N and P dopants on the shell of Co2P@N,P‐C were effective active sites for HER catalysis and that both Co2P and the N,P dopants gave rise to an optimized binding free energy of H on the active sites.