纳米复合材料
电催化剂
限制电流
电化学
材料科学
复合数
催化作用
化学工程
阴极
电流密度
电极
超声
旋转圆盘电极
纳米技术
复合材料
化学
循环伏安法
有机化学
物理化学
工程类
物理
量子力学
作者
Huodi Huang,Xiaofeng Zhang,Yi Zhang,Baohua Huang,Jiannan Cai,Shen Lin
标识
DOI:10.1016/j.ijhydene.2018.03.059
摘要
The Vulcan XC-72R modified WS2 nanocomposite (WS2/C)was prepared by solid reaction process combined with sonication. The as-prepared WS2/C nanocomposite presents a laminated porous structure by SEM and TEM characterization. The electrochemical experiments show that the onset potential and the limiting-current density of WS2/C is 0.78 V and 4.99 mA cm−2, respectively, which is much higher than, WS2 (3.12 mA cm−2) and Vulcan XC-72R (2.79 mA cm−2). The number of transfer electrons in ORR at the WS2/C nanocomposite electrode is 3.70, which is close to four-electron process. Besides, the current density of WS2/C nanocomposites remained at 90% after 20,000 s, indicating its superior electrochemical stability. All these facts reveal that the as-prepared WS2/C nanocomposite can be regarded as a promising cathode ORR catalyst for fuel cell.
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