Co2P-Fe2P heterogeneous nanoparticles: Efficient hydrogen oxidation/evolution electrocatalysts and surface reconstruction in alkaline media
Co2P-Fe2P heterogeneous nanoparticles: Efficient hydrogen oxidation/evolution electrocatalysts and surface reconstruction in alkaline media
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DOI：
10.1016/j.cej.2023.147425
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发表时间：
2023-12
影响因子：
15.1
通讯作者：
Wangzhi Wu;Xiang-feng Ma;Yongzheng Zhu;Fengtao Hu;Guo Huang;Nannan Wang;Shun-yan Ning;Yanqiu Zhu
中科院分区：
文献类型：
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作者：
Wangzhi Wu;Xiang-feng Ma;Yongzheng Zhu;Fengtao Hu;Guo Huang;Nannan Wang;Shun-yan Ning;Yanqiu Zhu
析氢和氧化是实现氢能循环利用和氢经济的关键。因此，开发高效稳定的非贵金属催化剂用于析氢反应（HER）和氢氧化反应（HOR）具有重要意义。在这项研究中，我们报道了在多孔碳骨架（Co2P-Fe2P/C）上容易合成的Co2P-Fe2P非均相纳米颗粒，该纳米颗粒在碱性条件下具有较高的HOR和HER活性。Co2P-Fe2P/C在10 mA cm−2时对HER的过电位为77 mV， Tafel斜率为42 mV dec−1，长期测试120 h后稳定性良好。在0.1 V时，HOR的电流密度为1.68 mA cm−2，接近商用Pt/C的电流密度。原位拉曼光谱表明，在HOR中检测到的Co2P-Fe2P/C、CoFe2O4和FeOOH参与了表面重构。密度泛函理论计算表明，Fe2P和Co2P在非均相界面处具有较强的电子相互作用，从而使其具有最佳的氢吸附强度。该研究对实现低成本、高效的HER和HOR双功能催化剂具有重要意义。
Hydrogen evolution and oxidation are critical to realizing hydrogen energy recycling and to the hydrogen economy. Therefore, it is important to develop non-precious metal catalysts with high efficiency and stability for the hydrogen evolution reaction (HER) and hydrogen oxidation reaction (HOR). In this study, we reported on the facile synthesis of Co2P-Fe2P heterogeneous nanoparticles on a porous carbon skeleton (Co2P-Fe2P/C), which exhibited high activity for both HOR and HER in alkaline conditions. The overpotential of Co2P-Fe2P/C toward HER was 77 mV at 10 mA cm−2, with a Tafel slope of 42 mV dec−1and excellent stability under long-term testing after 120 h. The current density at 0.1 V for HOR was 1.68 mA cm−2, which was close to that of commercial Pt/C. In situ Raman spectroscopy indicated that surface reconstruction was involved for Co2P-Fe2P/C, CoFe2O4, and FeOOH, as detected during HOR. Density functional theory calculations revealed strong electron interaction between Fe2P and Co2P at the heterogeneous interfaces, resulting in an optimal hydrogen adsorption strength for HER. This study significantly contributes to the realization of low-cost and high-efficiency bifunctional catalysts for HER and HOR.