过电位
石墨烯
碳纤维
氧化物
炭黑
化学工程
质子交换膜燃料电池
旋转圆盘电极
材料科学
膜
化学
离子交换
循环伏安法
氮化物
无机化学
电极
纳米技术
电化学
离子
复合材料
图层(电子)
有机化学
冶金
物理化学
复合数
生物化学
天然橡胶
工程类
作者
Enrico Negro,Antoine Bach Delpeuch,Keti Vezzù,Graeme Nawn,Federico Bertasi,Alberto Ansaldo,Vittorio Pellegrini,Beata Dembińska,Sylwia Żołądek,Krzysztof Miecznikowski,Iwona A. Rutkowska,Magdalena Skunik-Nuckowska,Paweł J. Kulesza,Francesco Bonaccorso,Vito Di Noto
标识
DOI:10.1021/acs.chemmater.7b05323
摘要
We report on the development of two new Pt-free electrocatalysts (ECs) for the oxygen reduction reaction (ORR) process based on graphene nanoplatelets (GNPs). We designed the ECs with a core–shell morphology, where a GNP core support is covered by a carbon nitride (CN) shell. The proposed ECs present ORR active sites that are not associated with nanoparticles of metal/alloy/oxide but are instead based on Fe and Sn subnanometric clusters bound in coordination nests formed by carbon and nitrogen ligands of the CN shell. The performance and reaction mechanism of the ECs in the ORR are evaluated in an alkaline medium by cyclic voltammetry with the thin-film rotating ring-disk approach and confirmed by measurements on gas-diffusion electrodes. The proposed GNP-supported ECs present an ORR overpotential of only ca. 70 mV higher with respect to a conventional Pt/C reference EC including a XC-72R carbon black support. These results make the reported ECs very promising for application in anion-exchange membrane fuel cells. Moreover, our methodology provides an example of a general synthesis protocol for the development of new Pt-free ECs for the ORR having ample room for further performance improvement beyond the state of the art.
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