Herein, we develop a multiphase strategy to improve the HER performance by incorporating the MoO phase with the addition of MoCl during the one-step hydrothermal. Adding MoCl at 0.5 mmol (MFN-0.5) yields the best HER performance, with an overpotential of 261 mV at a current density of 100 mA/cm. The MFN-0.5 catalyst exhibits excellent performance for both HER and OER, enabling it to drive full-cell water splitting with cell potentials of 1.50 and 1.71 V at 10 and 100 mA/cm, respectively. We further scale up the MFN-0.5 (4 ×4 cm) for a single stack-cell electrolyzer, requiring a cell potential of 1.85 V to achieve a large current density of 250 mA/cm. Incorporating the MoO phase accelerates the water dissociation step and protects the metal sulfide surface from oxidation under anodization in an alkaline environment. Our findings offer a promising approach for developing highly efficient catalysts for electrolytic water-splitting applications.

中文翻译：

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通过简便一步水热法制备的多相 Fe 掺杂 Ni3S2/MoOx 电催化剂用于全电池水分解：Mo 对物理和电化学性能的影响


在此，我们开发了一种多相策略，通过在一步水热过程中添加 MoO 相并添加 MoCl 来提高 HER 性能。添加 0.5mmol (MFN-0.5) MoCl 可产生最佳的 HER 性能，在电流密度为 100mA/cm 时过电势为 261mV。 MFN-0.5催化剂在HER和OER方面均表现出优异的性能，使其能够驱动全细胞水分解，在10和100mA/cm下的电池电位分别为1.50和1.71V。我们进一步将 MFN-0.5 (4 ×4cm) 放大为单堆叠电池电解槽，需要 1.85V 的电池电位才能实现 250mA/cm 的大电流密度。掺入 MoO 相可加速水解离步骤，并保护金属硫化物表面在碱性环境中阳极氧化时免受氧化。我们的研究结果为开发用于电解水分解应用的高效催化剂提供了一种有前景的方法。