Functionalized multi-walled carbon nanotubes as supporting matrix for enhanced ethanol oxidation on Pt-based catalysts
Functionalized multi-walled carbon nanotubes as supporting matrix for enhanced ethanol oxidation on Pt-based catalysts
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DOI：
10.1016/j.elecom.2011.03.041
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发表时间：
2011-07
影响因子：
5.4
通讯作者：
Le Ngoc Quynh Hoa;Mun'delanji C. Vestergaard;H. Yoshikawa;M. Saito;E. Tamiya
中科院分区：
文献类型：
--
作者：
Le Ngoc Quynh Hoa;Mun'delanji C. Vestergaard;H. Yoshikawa;M. Saito;E. Tamiya
在本报告中，我们使用功能化多壁碳纳米管 (f-MWCNT) 研究并表征了有机基支撑基质对增强铂基催化剂上乙醇氧化反应 (EOR) 的影响。我们利用胺和羧基，因为它们可以通过氢键诱导水吸附，产生-OHads以进一步氧化有毒中间体。结果表明，就氧化电流密度和稳定性而言，负载 Pt/MWCNT 的 COOH-MWCNT 增强的 EOR 动力学大约是 NH2-R-MWCNT 和裸 Pt/MWCNT 的三倍。此外，不同偏压下的电化学阻抗谱 (EIS) 谱表明，f-MWCNT 通过形成“OH 地毯”，减少了中间体物质在 Pt 活性表面上的吸附，并且还增强了 EOR 期间的电荷转移动力学。羧基 f-MWCNT 支持基质表现最好。在这项初步研究之后，可以进一步改进 EOR 动力学，例如优化 NT 的功能化，从而实现直接乙醇燃料电池的可行利用。
In this report, we investigated and characterized the effect of organic-based supporting matrix, using functionalized multi-walled carbon nanotubes (f-MWCNTs), toward enhancement of ethanol oxidation reaction (EOR) on Pt-based catalysts. We exploited amine and carboxylic groups since they could induce water adsorption via hydrogen bonding, creating -OHadsfor further oxidation of toxic intermediates. The results showed that the COOH-MWCNTs supported Pt/MWCNTs enhanced the kinetics of EOR approximately three times more than NH2-R-MWCNTs and the bare Pt/MWCNTs, in terms of oxidation current density and stability. Further, electrochemical impedance spectroscopy (EIS) spectra at different bias potentials showed that f-MWCNTs decreases the adsorption of intermediates species on Pt active surface by creating an “OH-carpet”, and also enhances the charge-transfer kinetic during the EOR. The carboxylic f-MWCNTs supporting matrix performed best. Following this initial study, further improvement in EOR kinetics such as optimizing the functionalization of NTs could be achieved, towards a viable utilization of a direct ethanol fuel cell.