Superior electrocatalysis of formic acid electro-oxidation on a platinum, gold and manganese oxide nanoparticle-based ternary catalyst
Superior electrocatalysis of formic acid electro-oxidation on a platinum, gold and manganese oxide nanoparticle-based ternary catalyst
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DOI：
10.1016/j.ijhydene.2017.11.016
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发表时间：
2018-01-04
影响因子：
7.2
通讯作者：
El-Deab, Mohamed S.
中科院分区：
文献类型：
--
作者：
Mohammad, Ahmad M.;Al-Akraa, Islam M.;El-Deab, Mohamed S.
介绍了一种新型的“MnOx/Au/Pt”三元纳米催化剂用于直接甲酸燃料电池（DFAFC）中的主要阳极反应--甲酸电氧化（FAO）。用于制备催化剂的方案利用Pt（纳米Pt）、Au（纳米Au）和氧化锰（纳米MnOx）纳米颗粒在玻璃碳（GC）载体表面上的顺序（逐层）电沉积。纳米Au通过改变DFAFC表面的几何形状，抑制了FAO反应机理中典型中间产物CO的吸附，从而提高了DFAFC的催化性能。另一方面，纳米MnOx可以通过加速电荷转移和在长时间连续操作期间赋予增强的催化稳定性来成功地介导FAO机制。有趣的是，通过纳米Au和纳米MnOx对Pt/GC电极的这种改性，显著的（约100%）改变了Pt/GC电极的性质。在Pt/GC电极上获得的67倍）实现了对FAO的催化活性的增强。(C)2017年氢能出版有限责任公司。由爱思唯尔有限公司出版。保留所有权利。
A novel "MnOx/Au/Pt" ternary nanocatalyst is recommended for formic acid electro-oxidation (FAO), the principal anodic reaction in direct formic acid fuel cells (DFAFCs). The protocol employed to prepare the catalyst utilized the sequential (layer-by-layer) electrodeposition of Pt (nano-Pt), Au (nano-Au) and manganese oxide (nano-MnOx) nanoparticles onto the surface of a glassy carbon (GC) support. The nano-Au enhanced the catalytic performance by changing the surface geometry to inhibit the adsorption of poisoning CO, which is a typical intermediate in the reaction mechanism of FAO, producing a potential deterioration of the catalytic performance of DFAFCs. On the other hand, nano-MnOx could successfully mediate the mechanism of FAO by accelerating the charge transfer and imparting an enhanced catalytic stability during long continuous operation. Interestingly, with this modification of the Pt/GC electrode by nano-Au and nano-MnOx, a significant (ca. 67 times that obtained at the Pt/GC electrode) enhancement in the catalytic activity toward FAO was achieved. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.