College of Mathematics and Physics, Shanghai University of Electric Power, Shanghai 201306, China.
Inorg Chem. 2023 Feb 13;62(6):2894-2904. doi: 10.1021/acs.inorgchem.2c04354. Epub 2023 Feb 2.
The development of efficient and low-cost transition-metal electrocatalysts is of great significance for hydrogen production from water splitting. Herein, we synthesized three-dimensional strawlike MoSe-NiSe composed of microrods on nickel foam (NF) by a one-step hydrothermal reaction. The as-prepared MoSe-NiSe/NF exhibited effective hydrogen evolution reaction (HER) activity (low overpotential of 79 mV at 10 mA cm and stability of 21 h in 1 M KOH), benefiting from the large electrochemically active area provided by strawlike structures, proper Se content, and synergistic effect of active phases. The enhanced oxygen evolution reaction (OER) activity (the low overpotential of 217 mV at 10 mA cm and maintaining stability for 47 h in 1 M KOH) was further observed for Fe-doped MoSe-NiSe/NF (MoSe-NiFeSe/NF) prepared by facile soaking, which can be mainly ascribed to optimized active phases formed on the OER process after Fe doping. The two-electrode system (MoSe-NiSe/NF||MoSe-NiFeSe/NF) requires a low cell voltage of 1.54 V to obtain a current density of 10 mA cm in 1 M KOH, which provides an interesting idea for constructing an effective overall water splitting system.
高效且低成本的过渡金属电催化剂的开发对于水分解制氢具有重要意义。在此，我们通过一步水热反应在泡沫镍（NF）上合成了由微棒组成的三维 strawlike MoSe-NiSe。所制备的 MoSe-NiSe/NF 在 1 M KOH 中具有有效的析氢反应（HER）活性（在 10 mA cm 时的过电位低至 79 mV，稳定性为 21 h），这得益于 strawlike 结构提供的大电化学活性面积、合适的 Se 含量以及活性相之间的协同作用。进一步观察到通过简便浸渍制备的 Fe 掺杂 MoSe-NiSe/NF（MoSe-NiFeSe/NF）具有增强的析氧反应（OER）活性（在 10 mA cm 时的过电位低至 217 mV，在 1 M KOH 中稳定 47 h），这主要归因于 Fe 掺杂后在 OER 过程中形成的优化的活性相。在 1 M KOH 中，两电极系统（MoSe-NiSe/NF||MoSe-NiFeSe/NF）需要 1.54 V 的低电池电压即可获得 10 mA cm 的电流密度，这为构建有效的全水分解系统提供了一个有趣的思路。
