氧化物溢出在稳定氧降低的铁混合电催化剂上
Huiting Niu1, Lei Huang1, Yanyang Qin2
1School of Chemistry and Chemical Engineering, State Key Laboratory of Materials Processing and Die & Mould Technology, Key Laboratory of Material Chemistry for Energy Conversion and Storage (Ministry of Education), Hubei Key Laboratory of Material Chemistry and Service Failure, Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology (HUST), 1037 Luoyu Road, Wuhan 430074, China.
这项研究在铁碳 (Fe-N-C) 矩阵中引入了一种新的铁 (PtFe) 合金催化剂,以提高燃料电池中氧降解反应 (ORR) 的耐用性.
科学领域:
- 电催化
- 材料科学
- 能量储存
背景情况:
- 无铁--碳 (Fe-N-C) 催化剂对氧降解反应 (ORR) 是有前途的,但由于铁漏,其耐用性较差.
- 这种与芬顿效应相关的不稳定性限制了它们在低温燃料电池中的应用.
研究的目的:
- 通过在Fe-N-C矩阵中整合铁 (PtFe) 合金,开发一种高效且稳定的无ORR催化剂.
- 解决Fe-N-C催化剂的耐用性问题,并加强其在燃料电池中的实际应用.
主要方法:
- 在Fe-N-C矩阵催化剂 (PtFe/Fe-N-C) 中制造集成的PtFe合金.
- 电化学表征包括半波电位 (E1/2) 测量和电位循环稳定性测试.
- 对过氧化 (H2O2) 产量的评估和燃料电池性能测试.
- 在现场实验和理论计算以阐明催化机制.
主要成果:
- 在50000次循环后,PtFe/Fe-N-C催化剂达到0.93V的高半波电位与RHE相比,衰减最小 (7mV).
- 在0.6V下显示出异常低的过氧化产量 (0.07%),在10,000个循环后保持.
- 使用 PtFe/Fe-N-C 阴极的燃料电池表现出了显著的耐用性,在 30,000 个循环后仅在 0.8 A cm-2 处损失 8 mV 的电压.
- 机理表明Fe-N-C向PtFe的氧气溢出抑制了H2O2的产生,并消除了激素.
结论:
- 集成的PtFe/Fe-N-C催化剂为氧降解反应提供了卓越的活性和稳定性.
- 这种催化剂设计有效抑制过氧化的产生,并提高燃料电池的耐用性.
- 这些发现为设计用于燃料电池应用的下一代高效和稳定的ORR催化剂提供了途径.
相关概念视频
Catalysis
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
Reduction of Alkenes: Catalytic Hydrogenation
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate
Limiting Reactant
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide


