Carbon Dots Promote the Performance of Anodized Nickel Passivation Film on Ethanol Oxidation by Enhancing Oxidation of the Intermediate

• 作者: Yandi Shi Fan Liao Wenxiang Zhu Huixian Shi Kui Yin Mingwang Shao
• 来源期刊: 中国化学（英文版）
• 年，卷（期）: 2021,（5）
• 所属期刊栏目: Concise Reports
• 页码范围: 1199-1204
• 页数: 6页
• 语种: 英文
• DOI: 10.1002/cjoc.202000665

摘要

Main observation and conclusion Ethanol is considered a better fuel than methanol in direct alcohol fuel cells because of the high energy density and low toxicity.Compared with noble metal catalysts,nickel-based catalysts are much cheaper in price.However,present nickel-based catalysts still surfer from some disadvantages such as low activity and high overpotential.In this paper,we show a new and high efficient nickel-based catalyst for ethanol oxidation.A layer of anodized nickel passivation film (Ni-APF) was formed on the surface of nickel sheet by anodic oxidation method with carbon dots (CDs) as co-catalyst.At the current density of 110 mA·cm-2,the potential for Ni-APF/CDs was only 0.541 V (vs.Ag/AgCl),which was 18.8％ lower than that of Ni-APF.Low overpotential could reduce electrode thermal loss and increase output energy.Ni-APF/CDs showed 144.4 mA·cm-2 peak current density at peak potential 0.662 V (vs.Ag/AgCl),which was 31％ higher than that of Ni-APF (110.3 mA·cm-2).In this system,CDs mainly function in the increase of charge-transfer capacity and the promotion oxidation of carbonaceous intermediates.