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Highly Durable Platinum Single‐Atom Alloy Catalyst for Electrochemical Reactions
Advanced Energy Materials ( IF 27.8 ) Pub Date : 2017-09-11 , DOI: 10.1002/aenm.201701476
Jiwhan Kim 1 , Chi-Woo Roh 1 , Suman Kalyan Sahoo 2 , Sungeun Yang 3 , Junemin Bae 1 , Jeong Woo Han 2 , Hyunjoo Lee 1
Affiliation  

Single atomic Pt catalyst can offer efficient utilization of the expensive platinum and provide unique selectivity because it lacks ensemble sites. However, designing such a catalyst with high Pt loading and good durability is very challenging. Here, single atomic Pt catalyst supported on antimony‐doped tin oxide (Pt1/ATO) is synthesized by conventional incipient wetness impregnation, with up to 8 wt% Pt. The single atomic Pt structure is confirmed by high‐angle annular dark field scanning tunneling electron microscopy images and extended X‐ray absorption fine structure analysis results. Density functional theory calculations show that replacing Sb sites with Pt atoms in the bulk phase or at the surface of SbSn or ATO is energetically favorable. The Pt1/ATO shows superior activity and durability for formic acid oxidation reaction, compared to a commercial Pt/C catalyst. The single atomic Pt structure is retained even after a harsh durability test, which is performed by repeating cyclic voltammetry in the range of 0.05–1.4 V for 1800 cycles. A full cell is fabricated for direct formic acid fuel cell using the Pt1/ATO as an anode catalyst, and an order of magnitude higher cell power is obtained compared to the Pt/C.

中文翻译:

用于电化学反应的高度耐用的铂单原子合金催化剂

单原子Pt催化剂可有效利用昂贵的铂,并具有独特的选择性,因为它缺少整体位点。然而,设计这种具有高Pt负载量和良好耐久性的催化剂是非常具有挑战性的。在这里,负载锑的氧化锡(Pt1 / ATO)上的单原子Pt催化剂是通过常规的初湿浸渍法合成的,Pt含量高达8 wt%。通过高角度环形暗场扫描隧道电子显微镜图像和扩展的X射线吸收精细结构分析结果,证实了单原子Pt结构。密度泛函理论计算表明,在本体相或SbSn或ATO表面用Pt原子取代Sb位在能量上是有利的。Pt1 / ATO对甲酸氧化反应显示出优异的活性和耐久性,与商用Pt / C催化剂相比。即使经过苛刻的耐久性测试,也可以保留单原子Pt结构,该测试通过在1800次循环中在0.05–1.4 V的范围内重复循环伏安法进行。使用Pt1 / ATO作为阳极催化剂制造了用于直接甲酸燃料电池的完整电池,与Pt / C相比,获得了更高数量级的电池功率。
更新日期:2017-09-11
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