Exploring highly active and stable electrocatalysts for oxygen evolution reaction (OER) is crucial for developing water splitting and rechargeable metal-air batteries. In this study, a hybrid electrocatalyst of CoFe alloy and Co_xN heterojunction encapsulated and anchored in N-doped carbon support (CoFe-Co_xN@NC) was in situ coupled via the pyrolysis of a novel coordination polymer derived from lignin biomacromolecule. CoFe-Co_xN@NC exhibited outstanding OER activity with a low overpotential of 270 mV at 10 mA cm⁻² and stability with an increment of 20 mV, comparable to commercial Ir/C. DFT calculations showed that Co_xN and N-doped graphitic encapsulation can reduce the binding strength between *O and CoFe alloy, limit metal leaching and agglomeration, and improve electron transfer efficiency, considerably enhancing the OER activity and stability. In situ coupling approach for preparing alloy and nitride heterojunctions on N-doped lignin-derived carbon offers a promising and universal catalyst design for developing renewable energy conversion technologies.

中文翻译：

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木质素衍生的碳包封 CoFe-CoxN 异质结的原位耦合用于析氧反应

探索用于析氧反应（OER）的高活性和稳定的电催化剂对于开发水分解和可充电金属空气电池至关重要。在这项研究中，通过热解源自木质素生物大分子的新型配位聚合物，将封装并锚定在 N 掺杂碳载体 (CoFe-Co _x N@NC) 中的 CoFe 合金和 Co _x N 异质结的混合电催化剂进行原位耦合。CoFe-Co _x N@NC 表现出出色的 OER 活性，在 10 mA cm ^-2时具有 270 mV 的低过电势和 20 mV 增量的稳定性，与商业 Ir/C 相当。DFT 计算表明_CoxN和N掺杂的石墨封装可以降低*O和CoFe合金之间的结合强度，限制金属的浸出和团聚，提高电子转移效率，显着提高OER活性和稳定性。在 N 掺杂的木质素衍生碳上制备合金和氮化物异质结的原位耦合方法为开发可再生能源转换技术提供了一种有前景的通用催化剂设计。