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电子捐赠-接收器激活了超耐用的氧气减少反应的反顿性质

Haomin Jiang^1,2, Jiayue He², Sitong Zhou²

¹Beijing Key Laboratory of Energy Conversion and Storage Materials Institution, College of Chemistry, Beijing Normal University, Beijing 100875, China.

|March 17, 2025

概括

将单原子铜引入铁碳 (Fe-N-C) 催化剂显著提高了氧降解反应 (ORR) 的性能和稳定性. 这种增强对于开发高效的无催化剂至关重要,用于空气电池等应用.

科学领域:

材料科学材料科学材料科学
电化学电化学电化学
催化剂是一种催化剂.

背景情况:

铁碳 (Fe-N-C) 材料是氧降解反应 (ORR) 的有希望的无催化剂.
Fe-N-C催化剂的主要局限性是铁 (Fe) 原子的溶解和氧化,阻碍长期稳定性和有效性.
Fe-N-C催化剂的微结构工程对于改善ORR活动和耐用性至关重要.

研究的目的:

通过结合单原子铜 (Cu) 来开发增强的Fe-N-C催化剂,以提高ORR性能和稳定性.
研究单原子Cu增强Fe-N-C材料的催化活性和耐久性的机制.
为了评估空气电池中开发的催化剂的性能.

主要方法:

用单原子铜位 (SA-Fe-N5) 合成辅助的Fe-N-C催化剂.
在性介质中对ORR活性进行SA-Fe-N5催化剂的电化学表征.
密度函数理论 (DFT) 计算以阐明电子结构和反应机制.
在空气电池中测试SA-Fe-N5催化剂作为阴极.

主要成果:

在性溶液中,SA-Fe-N5催化剂表现出优异的ORR活性,与商业Pt/C相当.
DFT计算显示,单原子Cu增强了Fe位点的电子密度,优化了ORR中间体的吸附/脱附能量.
该Cu位点作为一个酶单原子纳米酶 (CAT-SAzyme),分解H2O2副产品并改善抗芬顿活性.
空气电池中的SA-Fe-N5阴极催化剂实现了217.8 mW cm−2的高功率密度和257.3 mA cm−2.2的电流密度.

结论:

加入单原子铜是一种有效的策略,可以提高Fe-N-C催化剂的ORR性能和稳定性.
和铁位点之间的协同效应,以及改进的中间管理和H2O2分解,推动了增强的催化活性.
开发的SA-Fe-N5催化剂显示出在高性能储能设备 (如空气电池) 中使用的巨大潜力.

关键词:

-N5 / 铁-N5 双站点.反芬顿财产的反芬顿财产催化剂是一种单原子纳米酶.耐久性耐久性耐久性氧减少反应反应的氧减少反应.

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