Temperature-controlled growth of single-crystal Pt nanowire arrays for high performance catalyst electrodes in polymer electrolyte fuel cells
Temperature-controlled growth of single-crystal Pt nanowire arrays for high performance catalyst electrodes in polymer electrolyte fuel cells
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DOI：
10.1016/j.apcatb.2014.09.040
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发表时间：
2015-03-01
影响因子：
22.1
通讯作者：
Steinberger-Wilckens, Robert
中科院分区：
文献类型：
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作者：
Lu, Yaxiang;Du, Shangfeng;Steinberger-Wilckens, Robert
一维铂纳米线（PtNW）的各向异性结构和独特的表面性质使其成为一种有前途的新型电催化剂，可用于各种催化剂应用，特别是燃料电池。然而，由于关键的合成工艺，微调合成温度以精确控制PtNW在催化剂电极中的形态和分布仍然是一个巨大的挑战。在这项工作中，我们提出了大面积16 cm（2）碳纸片作为直接支撑的PtNW的温度控制的生长。通过物理表征研究了生长温度与PtNW行为之间的关系，并将其作为氢-空气燃料电池的阴极，测试了其对氧还原反应（ORR）的催化活性。结果表明，生长温度对PtNW的行为起着至关重要的作用，从而影响其性能。具有在40 ° C下生长的PtNW的催化剂电极显示出最佳的功率性能。温度对PtNW生长的影响提出了一种可能的机制。与最先进的商业TKK催化剂的比较也显示出更好的性能和耐久性。从PtNW催化电极的工作中获得的理解可以帮助在实际应用中设计其他新颖的纳米结构。(C)2014作者由爱思唯尔公司出版
The anisotropic structure and unique surface properties of one-dimensional (1D) Pt-nanowire (PtNW) make it a promising new type of electrocatalyst for various catalyst applications, especially for fuel cells. However, due to the critical synthesis process, a finely tuning of the synthesis temperature for precisely controlling the morphology and distribution of PtNWs in catalyst electrodes still remains a grand challenge. In this work, we present the temperature-controlled growth of PtNWs with large-area 16 cm(2) carbon paper piece as a direct support. The relationship between the growth temperature and PtNW behavior is studied by physical characterization, and their catalytic activity is measured towards oxygen reduction reaction (ORR) by testing as the cathode in a hydrogen-air fuel cell. The results show that the growth temperature plays a vital role on the behavior of PtNWs thus influencing their properties. The catalyst electrode with PtNWs grown at 40 degrees C shows the best power performance. A possible mechanism for the influence of temperature on PtNW growth is suggested. The comparison with the state-of-the-art commercial TKK catalyst also shows a better performance and durability. The understanding gained in our work from PtNW catalyst electrode could aid in the design of other novel nanostructures in practical applications. (C) 2014 The Authors. Published by Elsevier B.V.