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首页> 外文期刊>International Journal of Electrochemical Science >Comparing the Support Effects of Graphene Nanosheets (GNs) and N-doped GNs with Respect to Anti-Poisoning Performance of Pt Catalysts
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Comparing the Support Effects of Graphene Nanosheets (GNs) and N-doped GNs with Respect to Anti-Poisoning Performance of Pt Catalysts

机译：比较石墨烯纳米片（GNs）和N掺杂GNs对Pt催化剂的抗毒性能的支持作用

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摘要

It is of great significance to precisely evaluate the anti-poisoning performance (APP) of anode catalysts for development of direct liquids fuel cells. By controlloing the similarity of Pt deposited on graphene nanosheets (GNs) and N-dopped GNs (NGNs), Pt/GNs and Pt/NGNs were prepared as model catalysts for APP evaluation. Cyclic voltammograms (CVs) of Pt/GNs and Pt/NGNs for formate and methanol oxidation showed that the APP differences of two catalysts were hardly distinguished only from CVs because the activities of the two catalysts were similar. By further analyzing the i-t data, Pt/NGNs was proved to be evidently superior to Pt/GNs in terms of APP, verifying the necessity of APP analysis for comprehensive catalysts evaluation. Furthermore, by analyzing Raman spectra, CO stripping and X-ray photoelectron spectroscopy, stronger interaction between Pt and NGNs was shown to produce weaker adsorption of poisoning species on NGNs-supported Pt, which is benificial for enhancing APP of Pt/NGNs. We believe this understanding can shed light on future work toward rational supports engineering for APP improvement.
机译：精确评估阳极催化剂的抗中毒性能对于直接液体燃料电池的开发具有重要意义。通过控制沉积在石墨烯纳米片（GNs）和N掺杂的GNs（NGNs）上的Pt的相似性，制备了Pt / GNs和Pt / NGNs作为用于APP评价的模型催化剂。用于甲酸和甲醇氧化的Pt / GNs和Pt / NGNs的循环伏安图（CVs）表明，很难将两种催化剂的APP差异仅与CV区别开，因为两种催化剂的活性相似。通过进一步分析i-t数据，证明Pt / NGNs在APP方面明显优于Pt / GNs，证明了进行APP分析以进行综合催化剂评估的必要性。此外，通过分析拉曼光谱，CO汽提和X射线光电子能谱，显示Pt和NGN之间更强的相互作用会导致NGNs支撑的Pt上毒害物质的吸附较弱，这对于增强Pt / NGNs的APP有利。我们认为，这种理解可以为将来为APP改进提供合理支持工程的工作提供启发。

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