Exploitation of oxygen evolution reaction (OER) and urea oxidation reaction (UOR) catalysts with high activity and stability at large current density is a major challenge for energy-saving H₂ production in water electrolysis. Herein, we use the pyridinic-N doping carbon layers coupled with tensile strain of FeNi alloy activated by NiFe₂O₄ (FeNi/NiFe₂O₄@NC) for efficiently increasing the performance of water and urea oxidation. Due to the tensile strain effect on FeNi/NiFe₂O₄@NC, it provides a favorable modulation on the electronic properties of the active center, thus enabling amazing OER (η₁₀₀ = 196 mV) and UOR (E₁₀ = 1.32 V) intrinsic activity. Besides, the carbon-coated layers can be used as armor to prevent FeNi alloy from being corroded by the electrolyte to enhance the OER/UOR stability at large current density, showing high industrial practicability. This work thus provides a simple way to prepare high-efficiency catalyst for activating water and urea oxidation.

开发在大电流密度下具有高活性和稳定性的析氧反应（OER）和尿素氧化反应（UOR）催化剂是水电解中节能H _{2生产的主要挑战。在此，我们使用吡啶-N掺杂碳层与NiFe 2} O ₄ (FeNi/NiFe ₂ O ₄ @NC)激活的FeNi合金的拉伸应变相结合，以有效提高水和尿素氧化的性能。由于对 FeNi/NiFe ₂ O ₄ @NC 的拉伸应变效应，它为活性中心的电子特性提供了有利的调制，从而实现了惊人的 OER ( η ₁₀₀ = 196 mV) 和 UOR (E ₁₀ = 1.32 V) 内在活性。此外，碳包覆层可作为铠装，防止FeNi合金被电解液腐蚀，提高大电流密度下OER/UOR的稳定性，具有很高的工业实用性。因此，这项工作提供了一种制备用于活化水和尿素氧化的高效催化剂的简单方法。