Pt3Ag alloy wavy nanowires as highly effective electrocatalysts for ethanol oxidation reaction
Pt3Ag alloy wavy nanowires as highly effective electrocatalysts for ethanol oxidation reaction
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DOI：
10.1007/s12274-020-2754-4
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发表时间：
2020-04-07
期刊：
影响因子：
9.9
通讯作者：
Huang, Yu
中科院分区：
文献类型：
--
作者：
Fu, Xiaoyang;Wan, Chengzhang;Huang, Yu
直接乙醇燃料电池（DEFC）因其比压缩氢更方便的储存和运输而受到了巨大的研究兴趣。然而，电催化乙醇氧化反应通常需要贵金属催化剂，并且存在相对较高的过电位和较低的质量活性的问题。在这里，我们报告了通过简单的溶剂热过程中的颗粒附着机制合成 Pt3Ag 合金波状纳米线。透射显微镜研究和元素分析显示平均直径为 4.6 +/- 1.0 nm 的高度波状纳米线结构和均匀的 Pt3Ag 合金形成。电催化研究表明，所得合金纳米线可以作为乙醇氧化反应（EOR）的高效电催化剂，具有28.0 mA/cm(2)的超高比活性和6.1 A/mg的质量活性，远远超过商业Pt/碳样品（1.10 A/mg）。电催化活性的提高可能部分归因于 Pt3Ag 合金中部分电子从 Ag 转移到 Pt，从而削弱了 CO 结合和 CO 中毒效应。一维纳米线形态还有助于良好的电荷传输特性，这对于将电荷从催化活性位点提取到外部电路至关重要。计时电流分析法研究表明，与商业 Pt/C 样品相比，长期运行的稳定性显着提高，使得 Pt3Ag 波状纳米线成为 EOR 有吸引力的电催化剂。
Direct ethanol fuel cell (DEFC) has received tremendous research interests because of the more convenient storage and transportation of ethanol vs. compressed hydrogen. However, the electrocatalytic ethanol oxidation reaction typically requires precious metal catalysts and is plagued with relatively high over potential and low mass activity. Here we report the synthesis of Pt3Ag alloy wavy nanowires via a particle attachment mechanism in a facile solvothermal process. Transmission microscopy studies and elemental analyses show highly wavy nanowire structures with an average diameter of 4.6 +/- 1.0 nm and uniform Pt3Ag alloy formation. Electrocatalytic studies demonstrate that the resulting alloy nanowires can function as highly effective electrocatalysts for ethanol oxidation reactions (EOR) with ultrahigh specific activity of 28.0 mA/cm(2) and mass activity of 6.1 A/mg, far exceeding that of the commercial Pt/carbon samples (1.10 A/mg). The improved electrocatalytic activity may be partly attributed to partial electron transfer from Ag to Pt in the Pt3Ag alloy, which weakens CO binding and the CO poisoning effect. The one-dimensional nanowire morphology also contributes to favorable charge transport properties that are critical for extracting charge from catalytic active sites to external circuits. The chronoamperometry studies demonstrate considerably improved stability for long term operation compared with the commercial Pt/C samples, making the Pt3Ag wavy nanowires an attractive electrocatalyst for EOR.