The oxygen evolution reaction is the primary obstacle in the electrochemical breakdown of water; whereas transition metal selenides exhibit remarkable OER activity, their stability is compromised by the oxidative dissolution of selenium. The high-entropy materials can provide a feasible strategy to solve this problem due to their multi-element synergy and entropy stabilization effect. Here, we designed novel high-entropy MnCoCuZnAlSe electrocatalysts with ultra-low overpotential (190 mV@10 mA cm) and exceptional endurance (500 h@10 mA cm), which outperform other selenide and IrO catalysts. The high entropy effect was experimentally confirmed to inhibit selenium dissolution and improve the stability of transition metal selenides. Calculations using Density Functional Theory suggest that cobalt is actually MnCoCuZnAlSe's true active center. The extraordinary OER properties of high-entropy selenides offer great opportunities for the design of ideal catalysts for practical applications.

中文翻译：

---

高熵MnCoCuZnAlSe2纳米片阵列用于高效碱性析氧反应

析氧反应是水电化学分解的主要障碍；虽然过渡金属硒化物表现出显着的 OER 活性，但其稳定性因硒的氧化溶解而受到损害。高熵材料由于其多元素协同作用和熵稳定效应，可以为解决这一问题提供可行的策略。在这里，我们设计了新型高熵MnCoCuZnAlSe电催化剂，具有超低过电势（190 mV@10 mA cm）和卓越的耐久性（500 h@10 mA cm），其性能优于其他硒化物和IrO催化剂。实验证实高熵效应可以抑制硒的溶解，提高过渡金属硒化物的稳定性。使用密度泛函理论的计算表明，钴实际上是 MnCoCuZnAlSe 的真正活性中心。高熵硒化物非凡的 OER 特性为设计实际应用的理想催化剂提供了绝佳的机会。