Extraordinary electrocatalytic performance for formic acid oxidation by the synergistic effect of Pt and Au on carbon black
Extraordinary electrocatalytic performance for formic acid oxidation by the synergistic effect of Pt and Au on carbon black
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Pt 和 Au 在炭黑上的协同作用对甲酸氧化具有非凡的电催化性能
DOI：
10.1016/j.nanoen.2018.03.018
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发表时间：
2018-06-01
期刊：
影响因子：
17.6
通讯作者：
Wang, Rongming
中科院分区：
文献类型：
--
作者：
Fan, Hongsheng;Cheng, Ming;Wang, Rongming
甲酸电氧化反应是燃料电池中典型的阳极反应，提高其催化剂性能和了解其反应机理具有重要的技术和科学意义。本文设计并合成了Pt-Au/C催化剂用于催化FAO反应。采用超声辅助的方法，在不添加任何表面活性剂的情况下，将Pt和Au均匀、致密地负载在炭黑上。Pt/Au原子比为32：68的Pt-Au/C样品的FAO催化活性为14.5 Amg（Pt）（-1），比Pt/C高153倍。这一优异的性能归因于Pt和Au的优化协同效应。密度泛函理论计算表明，相邻的Au降低了Pt上直接反应的能垒。这项工作证明了一个有前途的FAO催化剂和有效的战略，以获得负载型催化剂。
Improving catalyst performance and understanding reaction mechanism of formic acid electrooxidation (FAO), a typical anodic reaction in fuel cells, are of technological and scientific importance. Here, Pt-Au/C catalysts were designed and synthesized for catalyzing the FAO reaction. An ultrasound-assisted method was developed to enable the uniform and dense loading of Pt and Au on carbon black without any surfactant. The Pt-Au/C sample with a Pt/Au atomic ratio of 32: 68 exhibits an FAO catalytic activity of 14.5 A mg(Pt)(-1), which is 153 times higher than that of Pt/C. The extraordinary performance is attributed to the optimized synergistic effect of Pt and Au. Density functional theory calculations disclose that the neighboring Au decreases the reaction energy barriers of the direct pathway on Pt. This work demonstrates a promising FAO catalyst and an effective strategy to obtain supported catalysts.