The number of layered materials seems to be ever-growing, from mono- to multielement, with affiliates and applications being tested continuously. Chalcogenophosphites, also designated as metal phosphorus chalcogenides (MPX_n), have attracted great interest because of not only their magnetic properties but also promising capabilities in energy applications. Herein, bulk crystals of different layered metal triselenophosphites, with a general formula MPSe₃ (M = Cd, Cr, Fe, Mn, Sn, Zn), were synthesized. Structural and morphological characterization was performed prior to testing their electrochemical performance. From the set of ternary layered materials, FePSe₃, followed by MnPSe_3, yielded the highest efficiency for the hydrogen evolution reaction (HER) both in acidic and alkaline media with good stability after 100 cycles. MnPSe₃ also holds the lowest oxidation potential for cysteine, although this is due to the presence of MnO₂ in the structure as detected by X-ray photoelectron spectroscopy. For the oxygen evolution reaction, the best performance was observed for FePSe₃, although the stability of the material was not as good as in the case of HER. These findings have profound implications in the application of these layered ternary compounds in energy-related fields.

中文翻译：

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金属元素在层状金属三硒化物的电化学传感和能量应用中的作用

从单元素到多元素，分层材料的数量似乎正在不断增长，并且附属机构和应用程序也在不断测试中。硫属亚磷酸酯，也称为金属磷硫属元素化物（MPX _n），不仅具有磁性，而且在能源应用方面具有广阔的前景，引起了人们的极大兴趣。在此，合成了具有MP MP ₃通式（M = Cd，Cr，Fe，Mn，Sn，Zn）的不同层状金属亚硒化亚磷酸酯的块状晶体。在测试其电化学性能之前进行了结构和形态表征。从三元分层材料集中，FePSe ₃，其次是MnPSe _3，在100次循环后，在酸性和碱性介质中产生的氢释放反应（HER）效率最高，并且具有良好的稳定性。MnPSe ₃还具有最低的半胱氨酸氧化电位，尽管这是由于X射线光电子能谱检测到的结构中存在MnO ₂所致。对于氧放出反应，FePSe _3的性能最佳，尽管该材料的稳定性不如HER情况。这些发现对这些层状三元化合物在能源相关领域的应用具有深远的影响。