Engineering of Highly Active Silver Nanoparticles for Oxygen Electroreduction via Simultaneous Control over Their Shape and Size
Engineering of Highly Active Silver Nanoparticles for Oxygen Electroreduction via Simultaneous Control over Their Shape and Size
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DOI：
10.1002/adsu.201700117
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发表时间：
2017-12-01
影响因子：
7.1
通讯作者：
Bandarenka, Aliaksandr S.
中科院分区：
文献类型：
--
作者：
Garlyyev, Batyr;Liang, Yunchang;Bandarenka, Aliaksandr S.
氧还原反应（ORR）是最重要的电催化反应之一，它需要高效且经济可行的电催化剂。虽然Pt（Pd）基催化剂显示出用于汽车应用的最佳ORR性能，但由于Pt（Pd）的高成本，它们在大规模工业过程中的使用（例如在氯碱工业中的氧去极化阴极处）是有问题的。银比铂便宜得多，被称为碱性介质中的“第二活性”ORR电催化剂。采用一步自下而上的方法合成了三种不同尺寸的形状选择性银纳米片。在没有合金化的情况下，最佳的Ag纳米片显示出在0.8V下相对于可逆氢电极对ORR的约2.6mA cm（-2）的比活性（比Ag（110）高3倍）和约114 Ag-Ag（-1）的质量活性（比现有技术的Ag纳米球高6.5倍）。这些活动是最高的纯银电催化剂（单晶和纳米结构）在类似条件下测量的文献中报道。
The oxygen reduction reaction (ORR) is one of the most important electrocatalytic reactions, which requires efficient and economically viable electrocatalysts. While Pt(Pd)-based catalysts show the best ORR performance for automotive applications, their use in large-scale industrial processes, for instance at the oxygen depolarized cathodes in chloralkali industry, is questionable due to the high cost of Pt(Pd). Silver, being much more affordable than platinum, is known as the "second-active" ORR electrocatalyst in alkaline media. Shape-selected Ag nanoplates of three different sizes are synthesized using a one-step bottom-up approach. With no alloying, optimal Ag nanoplates show specific activity of approximate to 2.6 mA cm(-2) (3 times higher than Ag (110)) and mass activity of approximate to 114 Ag-Ag(-1) (6.5 times higher compared to state-of-the-art Ag nanospheres) toward ORR at 0.8 V versus reversible hydrogen electrode. These activities are the highest reported in the literature for pure Ag electrocatalysts (both single crystalline and nanostructured) measured under similar conditions.