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| 4. Xia et al. previously used Cu nanowire (CuNW) templated Pt nanotubes (PtNTs (Cu)) in the study of formic acid oxidation. 12 Although the activity of PtNTs (Cu) was signi fi cantly higher than Pt/C, the Pt utilization was low (PtNT wall thickness of 12 nm); furthermore, the templated growth directions were not preserved and ORR activity was not examined. PtNTs (Cu) were initially studied for ORR activity because of the low cost and facile synthesis of CuNWs in comparison to AgNWs. Preliminary analysis concluded that PtNTs (Cu) produced an area activity signi fi cantly larger than the DOE target and PtNTs (Ag). PtNTs (Cu), however, produced a dollar activity of 1.9 A $ −1 ; to meet a dollar activity benchmark using a CuNW template, the Pt loading needed to be signi fi cantly reduced (to 19 wt % Pt) while maintaining a high ORR area activity. CuNWs further provide an acceptable substrate because Pt tends to segregate on a Cu surface (−0.04 eV atom −1 for a Pt impurity on a Cu host), preventing Pt from migrating into the CuNW core. 11 In addition, Cu has a low dissolution potential (0.159 V) and can be easily removed electrochemically. Pt coated CuNWs (Pt/CuNWs) were therefore synthesized by the partial galvanic displacement of CuNWs. Pt loadings were optimized for catalyst cost and stability; the resulting Pt/CuNW catalyst examined in this study was found to be highly active and durable for ORR. This study was completed simultaneously with work performed by Pivovar et al. at the National Renewable Energy Laboratory on CuNW synthesis and the electrochemical characterization of PtNTs (Cu). 13,14 |
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xiaojian0502
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nono2009: 屏蔽内容, 违规存档, 本版严禁google等机器翻译 2013-11-18 14:49:50
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2楼2013-11-17 21:41:15
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| 4。 Xia等曾用的铜纳米线（CuNW）为模板的Pt纳米管（PtNTs（铜））对蚁酸氧化进行研究。12虽然PtNTs（铜）的活性与Pt / C更高，Pt利用率较低（PTNT壁厚为12nm ）；而且，模板化延长方向没有保留和ORR活性没有经过检查。 PtNTs（Cu）首先用于ORR活性乃因为CuNWs与AgNWs相比易于合成且成本低。初步分析认为，PtNTs（铜）产生的区域活性明显大于美国能源部的标准和PtNTs（银）。然而， PtNTs（铜）每一美元成本产生1.9美元活性，要满足使用CuNW模板单位美元活性的标准，Pt负载需要显著减少（至19%重量的Pt）并同时保持高ORR区域活性。 CuNWs进而提供一个可接受的基板，因为铂倾向于隔离在Cu表面（铜主体上每一原子Pt杂质-0.04 eV），防止从铂迁移到CuNW核心。 11此外，铜具有低的溶解电位（0.159 V），很容易电化学去除。铂涂层CuNWs（铂/ CuNWs）由于CuNWs的局部电位移动被合成。Pt负载量以催化成本和稳定性优化;产生的Pt / CuNW催化剂经研究后在本研究中被认为是高活性和耐用的ORR催化剂。这项研究利用了由Pivovar等人在国家可再生能源实验室的CuNW合成和PtNTs（铜）电化学特性的工作。 13,14 |
3楼2013-11-27 21:35:00