质子交换膜燃料电池
催化作用
铂金
基质(水族馆)
氮气
化学工程
材料科学
碳纤维
无机化学
化学
化学气相沉积
氧气
纳米技术
有机化学
地质学
工程类
海洋学
复合材料
复合数
作者
Jiao Li,Jingkun Li,Lynne LaRochelle Richard,Qiang Sun,Thomas Stracensky,Ershuai Liu,Moulay Tahar Sougrati,Zipeng Zhao,Fan Yang,Sichen Zhong,Hui Xu,Sanjeev Mukerjee,Yu Huang,David A. Cullen,Deborah J. Myers,Frédéric Jaouen,Qingying Jia
标识
DOI:10.26434/chemrxiv.12918983.v1
摘要
Replacing scarce and expensive platinum (Pt) with metal-nitrogen-carbon (M-N-C) catalysts for the oxygen reduction reaction (ORR) in proton exchange membrane fuel cells (PEMFCs) has largely been impeded by the low activity of M-N-C, in turn limited by low site density and low site utilization. Herein, we overcome these limits by implementing chemical vapor deposition (CVD) to synthesize Fe-N-C, an approach fundamentally different from previous routes. The Fe-N-C catalyst, prepared by flowing iron chloride vapor above a N-C substrate at 750 ℃, has a record Fe-N 4 site density of 2×10 20 sites·gram -1 with 100% site utilization. A combination of characterizations shows that the Fe-N 4 sites formed via CVD are located exclusively on the outer-surface, accessible by air, and electrochemically active. This catalyst delivers an unprecedented current density of 33 mA·cm -2 at 0.90 V i R-free ( iR -corrected) in an H 2 -O 2 PEMFC at 1.0 bar and 80 ℃.
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