As an energy carrier, hydrogen shows great promise superior to the traditional fossil fuels to meet the ever-increasing global energy demands. Electrochemical water splitting has been considered to be an effective method to produce hydrogen cleanly. The two reactions, the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER), in water splitting need efficient and Earth-abundant catalysts. Previous research indicates that the introduction of heteroatoms is an efficient way to improve the catalytic performance of metal sulfides due to the synergistic effect. Here, we demonstrate a yolk–shell phosphosulphide (FeCoNi-PS) with a porous structure, which shows good catalysis for both the HER and OER in alkaline media. In particular, the present catalyst showed geometrical current densities of 10 mA cm⁻² and 100 mA cm⁻² for the OER at overpotentials of 162 mV and 205 mV, respectively. In addition, the catalyst showed outstanding stability in a long-term operation test. This achievement sheds light on an effective route to design a high-performance, low-cost catalyst for large-scale water splitting.

中文翻译：

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改善使用磷硫化物表面进行电化学水分解的催化作用

作为一种能源载体，氢具有超越传统化石燃料的广阔前景，可以满足日益增长的全球能源需求。电化学水分解被认为是清洁生产氢气的有效方法。在水分解中的两个反应，放氢反应（HER）和放氧反应（OER），需要高效且富地球的催化剂。先前的研究表明，由于协同作用，引入杂原子是提高金属硫化物催化性能的有效方法。在这里，我们证明了具有多孔结构的卵黄壳磷酸硫（FeCoNi-PS），在碱性介质中对HER和OER均显示出良好的催化作用。特别地，本催化剂显示出10mA cm ^-2的几何电流密度对于OER，在过电势分别为162 mV和205 mV时为100 mA cm ^-2。另外，该催化剂在长期运行试验中显示出优异的稳定性。这项成就为设计用于大规模水分解的高性能，低成本催化剂的有效途径提供了启示。