基于Fe、Co、Ni的电催化析氢催化剂的研究进展

为探究不同掺杂对镍基磷化物催化性能的影响, 采用水热法制备4种不同掺杂(Fe、Co、Mo、W)的镍基前驱体, 然后通过化学气相沉积法对不同前驱体磷化, 得到相应的4种镍基磷化物。经SEM分析发现, 不同前驱体的结构存在较大差异。磷化后, 仅有NiMoP较好地保留了其前驱体的原有形貌, 展示出最佳的结构稳定性。XPS分析表明: 4种镍基磷化物表现出不同价态结构, Fe、Co掺杂镍基磷化物具有相似低价态结构, 而Mo、W掺杂镍基磷化物具有高价电子态结构。进一步电化学析氢测试表明, NiMoP在10 mA/cm²的电流密度下过电位仅为97 mV, 与贵金属Pt的83 mV相近, 远低于其他3种样品的过电位。同时, 在长期的稳定性测试中, NiMoP也表现出比其他3种磷化物更为优良的稳定性能, 表明其良好的析氢催化活性。

Heterogeneousphotocatalyst materials for water splitting

To explore the effect of different doping on the catalytic performance of nickel-based phosphides, four kinds of nickel-based precursors with different doped (Fe, Co, Mo, and W) nickel-based phosphides were first prepared by hydrothermal method, and then these precursors were phosphating by chemical vapor deposition method. The precursors showed large structural differences by SEM analysis. After phosphating, only NiMoP retained the similar morphology as that of its precursor and exhibited the best structural stability. XPS results indicated that the four different doped nickel-based phosphides showed different valence state structures, Fe and Co-doped nickel-based phosphides had similar low- valence electronic state structures, while Mo and W doped nickel-based phosphides had high-valence electronic state structures. Further electrochemical hydrogen evolution tests showed that the overpotential of NiMoP at a current density of 10 mA/cm² was only 97 mV, which was similar to the 83 mV of the precious metal Pt, and much lower than the overpotential of the other three samples. At the same time, in the long-term stability test, NiMoP also showed better stability property than the other three phosphates, indicating its good catalytic activity of hydrogen evolution.