石墨烯
材料科学
X射线光电子能谱
硼
催化作用
氧化物
化学工程
电化学
兴奋剂
纳米技术
电解质
氧化石墨烯纸
石墨烯泡沫
电极
无机化学
化学
光电子学
物理化学
冶金
有机化学
工程类
作者
Zhen-Huan Sheng,Hong-Li Gao,Wenjing Bao,Feng‐Bin Wang,Xing‐Hua Xia
摘要
Boron atoms, with strong electron-withdrawing capability, are doped into graphene frameworks forming boron doped graphene (BG) via a catalyst-free thermal annealing approach in the presence of boron oxide. Atomic force microscopic (AFM) and transmission electron microscopic (TEM) characterizations reveal that the as-prepared BG has a flake-like structure with an average thickness of ca. 2 nm. X-ray photoelectron spectroscopy (XPS) analysis demonstrates that boron atoms can be successfully doped into graphene structures with the atomic percentage of 3.2%. Due to its particular structure and unique electronic properties, the resultant BG exhibits excellent electrocatalytic activity towards oxygen reduction reaction (ORR) in alkaline electrolytes, similar to the performance of Pt catalysts. In addition, the non-metallic BG catalyst shows long-term stability and good CO tolerance superior to that of Pt-based catalysts. These results demonstrate that the BG, as a promising candidate in advanced electrode materials, may substitute Pt-based nanomaterials as a cathode catalyst for ORR in fuel cells as well as other electrochemical applications similar to the reported nitrogen doped graphene.
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