Developing efficient electrocatalysts for water oxidation is of vital importance for the electrochemical production of hydrogen (H₂) fuels. Herein, we report the hydrothermal synthesis of a NiTe₂ nanosheet array anchored on Ti mesh (NiTe₂/TM) through the topotactic transformation from a Ni(OH)₂ nanoarray on the basis of an anion exchange reaction. As a robust non‐noble‐metal catalyst electrode for alkaline water oxidation, NiTe₂/TM exhibits high activity and delivers a small overpotential of 315 mV to realize an anodic geometrical current density of 10 mA cm⁻², with superior long‐term durability. It is suggested that the NiOOH species is evolved as the active phase for water oxidation. This study reveals a very profound earth‐abundant 3D catalyst electrode for electrochemical water splitting towards large‐scale and clean H₂ evolution from water.

中文翻译：

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二碲化镍纳米片阵列：氧气析出反应的高效电催化剂

开发用于水氧化的高效电催化剂对于电化学生产氢（H ₂）燃料至关重要。在本文中，我们报告了通过阴离子交换反应从Ni（OH）₂纳米阵列进行全向变换，锚固在Ti网孔（NiTe ₂ / TM）上的NiTe ₂纳米片阵列的水热合成。作为用于碱性水氧化的坚固耐用的非贵金属催化剂电极，NiTe ₂ / TM具有高活性，并提供315 mV的小过电位，可实现10 mA cm ^-2的阳极几何电流密度，具有出色的长期耐用性。建议将NiOOH物种进化为水氧化的活性相。这项研究揭示了一种非常丰富的地球3D催化剂电极，可用于将电化学水分解为从水中大规模清洁生成的H ₂。