质子交换膜燃料电池
催化作用
材料科学
电催化剂
化学工程
浸出(土壤学)
阴极
纳米技术
化学
电极
电化学
有机化学
物理化学
工程类
环境科学
土壤科学
土壤水分
作者
Shuhu Yin,Yani Yan,Long Chen,Ningyan Cheng,Xinjian Cheng,Rui Huang,Huan Huang,Bin‐Wei Zhang,Yanxia Jiang,Shi‐Gang Sun
出处
期刊:ACS Nano
[American Chemical Society]
日期:2023-12-19
被引量:1
标识
DOI:10.1021/acsnano.3c08570
摘要
The exorbitant cost of Pt-based electrocatalysts and the poor durability of non-noble metal electrocatalysts for proton exchange membrane fuel cells limited their practical application. Here, FeN4 active sites electronically coupled with PtFe alloys (PtFe-FeNC) were successfully prepared by a vapor deposition strategy as an ultralow Pt loading (0.64 wt %) hybrid electrocatalyst. The FeN4 sites on the FeNC matrix are able to effectively anchor the PtFe alloys, thus inhibiting their aggregation during long-life cycling. These PtFe alloys, in turn, can efficiently restrain the leaching of the FeN4 sites from the FeNC matrix. Thus, the PtFe-FeNC demonstrated an improved Pt mass activity of 2.33 A mgPt-1 at 0.9 V toward oxygen reduction reaction, which is 12.9 times higher than that of commercial Pt/C (0.18 A mgPt-1). It demonstrated great stability, with the Pt mass activity decreasing by only 9.4% after 70,000 cycles. Importantly, the fuel cell with an ultralow Pt loading in the cathode (0.012 mgPt cm-2) displays a high Pt mass activity of 1.75 A mgPt-1 at 0.9 ViR-free, which is significantly better than commercial MEA (0.25 A mgPt-1). Interestingly, PtFe-FeNC catalysts possess enhanced durability, exhibiting a 12.5% decrease in peak power density compared to the 51.7% decrease of FeNC.
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