氢氧化物
氧气
催化作用
联轴节(管道)
离子
化学
氧还原
还原(数学)
分子氧
组合化学
无机化学
光化学
材料科学
生物化学
物理化学
有机化学
电化学
电极
几何学
数学
冶金
作者
Poe Ei Phyu Win,Jian Yang,Shuwang Ning,Xiang Huang,Gengtao Fu,Qiang Sun,Xing-Hua Xia,Jiong Wang
标识
DOI:10.1073/pnas.2316553121
摘要
Developing cost-effective and high-performance electrocatalysts for oxygen reduction reaction (ORR) is critical for clean energy generation. Here, we propose an approach to the synthesis of iron phthalocyanine nanotubes (FePc NTs) as a highly active and selective electrocatalyst for ORR. The performance is significantly superior to FePc in randomly aggregated and molecularly dispersed states, as well as the commercial Pt/C catalyst. When FePc NTs are anchored on graphene, the resulting architecture shifts the ORR potentials above the redox potentials of Fe 2+/3+ sites. This does not obey the redox-mediated mechanism operative on conventional FePc with a Fe 2+ –N moiety serving as the active sites. Pourbaix analysis shows that the redox of Fe 2+/3+ sites couples with HO − ions transfer, forming a HO–Fe 3+ –N moiety serving as the ORR active sites under the turnover condition. The chemisorption of ORR intermediates is appropriately weakened on the HO–Fe 3+ –N moiety compared to the Fe 2+ –N state and thus is intrinsically more ORR active.
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