To solve the energy crisis and environmental pollution problems, the use of clean and renewable energy to replace fossil energy has become a top priority. The oxygen evolution reaction (OER) is the core of many renewable energy technologies. Developing low-cost and high-performance OER electrocatalysts is the key to implementing efficient energy conversion processes. Here, we synthesize ordered mesoporous iron–cobalt oxides using a hard template strategy. As a mesoporous oxide catalyst, meso-CoFe_0.05O_x exhibits low OER overpotentials of 280 and 373 mV at current densities of 10 and 100 mA cm⁻², respectively, and does not show deactivation for at least 18 hours at 100 mA cm⁻². The introduction of iron can change the electronic structure of Co, and the orbital electrons are easily transferred from cobalt to iron. The enhanced OER performance can be attributed to concerted catalysis between the iron and cobalt sites that lowers the OER energy barrier, and the large specific surface area of the porous oxide providing efficient active sites for the reaction.

中文翻译：

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增强介孔钴铁氧化物的析氧活性

为解决能源危机和环境污染问题，使用清洁可再生能源替代化石能源成为当务之急。析氧反应 (OER) 是许多可再生能源技术的核心。开发低成本、高性能的 OER 电催化剂是实现高效能量转换过程的关键。在这里，我们使用硬模板策略合成有序介孔铁钴氧化物。作为介孔氧化物催化剂，meso -CoFe _0.05 O _x在电流密度为 10 和 100 mA cm ^-2时分别表现出 280 和 373 mV 的低 OER 过电位，并且在 100 mA cm ^-下至少 18 小时未显示失活². 铁的引入可以改变Co的电子结构，轨道电子很容易从钴转移到铁。增强的 OER 性能可归因于铁和钴位点之间的协同催化降低了 OER 能垒，以及多孔氧化物的大比表面积为反应提供了有效的活性位点。