利用化學氣相沉積法合成可作為全電解水觸媒的原子級混合熵穩定硫化物

Atomically mixed entropy-stabilized metal sulfides synthesized via chemical vapor deposition as electrocatalysts for overall water electrolysis

本研究成功設計出一種非貴金屬熵穩定硫化物（Entropy-Stabilized Metal Sulfides, ESMSs）嵌入於摻硫聚丙烯腈衍生碳纖維中的新穎複合電觸媒。透過原子尺度的均勻元素分佈與協同作用，有效提升觸媒活性，展現出可同時作為鹼性電解水中的析氫反應（Hydrogen Evolution Reaction, HER）與析氧反應（Oxygen Evolution Reaction, OER）的雙功能性電催化劑。該觸媒在鹼性條件（1 M KOH）下展現優異活性，僅需–55 mV（HER）與210 mV（OER）的過電位，即可驅動10 mA cm-2的電流密度。經過500 mA cm-2電流密度下連續操作48小時後，效率僅衰退5.2%，顯示其極佳的操作穩定性與長期耐久性。本研究不僅展示熵穩定概念在硫化物催化系統中的應用潛力，亦為非貴金屬觸媒的設計提供新方向，未來可望推進其於可再生能源轉換與儲存技術中的實際應用。

A non-precious-metal entropy-stabilized metal sulfides (ESMSs) embedded in sulfur-doped polyacrylonitrile-derived carbon fiber (SPAN-FCNM) has been successfully designed as a novel composite electrocatalyst. Through atomically homogeneous distribution and strong synergistic interactions among elements, the catalyst exhibits enhanced electrocatalytic activity and remarkable bifunctional performance. It delivers low overpotentials for both the hydrogen evolution reaction (HER,η₁₀=–55 mV) and oxygen evolution reaction (OER,η₁₀= 210 mV) in 1 M KOH. Impressively, only a 5.2% performance decay is observed after continuous operation at 500 mA cm-2 for 48 h, demonstrating excellent operational stability and long-term durability. This work highlights the potential of entropy-engineered sulfides in advancing non-precious electrocatalysts for renewable energy conversion and storage.