石墨烯
氧化物
X射线光电子能谱
拉曼光谱
热重分析
水溶液
催化作用
无机化学
硼氢化钠
化学
粒径
材料科学
化学工程
纳米技术
有机化学
物理化学
物理
光学
工程类
作者
Dean E. Glass,G. K. Surya Prakash,George A. Olah
出处
期刊:Meeting abstracts
日期:2016-09-01
卷期号:MA2016-02 (8): 1054-1054
标识
DOI:10.1149/ma2016-02/8/1054
摘要
The hydrothermal reduction of many compounds including graphene oxide usually takes place in a basic aqueous environment when using many reducing agents. In this study, graphene oxide was reduced by sodium borohydride in aqueous solutions among a wide spectrum of pH values ranging from 1 to 13. X-ray powder diffraction (XRD), thermogravimetric analysis, and infrared spectroscopy (FTIR) confirmed the reduction of the graphene oxide at each respective pH value. With increasing pH values, Raman and X-Ray photoelectron spectroscopy (XPS) spectra of the resultant graphenes showed an increase in the repair in the carbon sp 2 lattice while XRD showed a larger overall particle size. Electrochemical testing in basic media showed higher oxygen reduction capabilities in the catalysts that were reduced at higher pH values. The onset potential of the oxygen reduction reaction (ORR) as well as the electron transfer number also increased as the pH of the solution increased overall. The graphene oxide catalyst reduced at pH 1, however, showed superior limiting current densities in the linear sweep voltammetries even though the onset potential was the lowest. This increased ORR activity is most likely due to the better repaired graphitic domain of the catalysts reduced at higher pH values even though the overall particle size is bigger.
科研通智能强力驱动
Strongly Powered by AbleSci AI