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Highly Strained Au Nanoparticles for Improved Electrocatalysis of Ethanol Oxidation Reaction.
The Journal of Physical Chemistry Letters ( IF 5.7 ) Pub Date : 2020-03-04 , DOI: 10.1021/acs.jpclett.9b03623
Xun Cao 1 , Chaojiang Li 2 , Dongdong Peng 1 , Yu Lu 1 , Kang Huang 3 , Junsheng Wu 3 , Chunwang Zhao 4 , Yizhong Huang 1
Affiliation  

Au is an ideal noble metal as an electrocatalyst for ethanol oxidation reaction owing to its high performance-to-cost ratio. The catalyst usually exists as nanoparticles (NPs) for high surface area to volume ratio. In the present paper, a non-traditional physical approach has been developed to fabricate ultra-small and homogeneous single crystalline Au NPs by ion bombardment in a PIPS system. TEM characterizations show that the Au NPs produced with 5 keV Ar+ are highly strained to form twinned crystals, which accumulate large amount of surface energy, and this was found to be an underlying reason causing strong catalysis. Electrochemistry tests reveal that in alkaline medium, C1 pathway occurs much more preferentially with the strained Au NPs than the normal Au NPs. Surface area to volume ratio is no longer the only factor that affects the performance; instead, surface energy might play a more important role in enhancing the catalytic activities.

中文翻译:

用于改善乙醇氧化反应电催化的高应变金纳米粒子。

由于其高的性价比,Au是用于乙醇氧化反应的理想的贵金属催化剂。催化剂通常以纳米颗粒(NPs)的形式存在,以实现高表面积体积比。在本文中,已经开发了一种非传统的物理方法来通过PIPS系统中的离子轰击来制造超小且均匀的单晶Au NP。TEM表征表明,以5 keV Ar +生成的Au NPs高度应变,以形成孪晶,并积累了大量的表面能,这被认为是引起强催化作用的根本原因。电化学测试表明,在碱性介质中,应变的Au NPs比正常的Au NPs更优先出现C1途径。表面积体积比不再是影响性能的唯一因素。相反,表面能可能在增强催化活性方面起更重要的作用。
更新日期:2020-04-24
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