Cu-template-dependent synthesis of PtCu nanotubes for oxygen reduction reactions
Cu-template-dependent synthesis of PtCu nanotubes for oxygen reduction reactions
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用于氧还原反应的铜模板依赖性合成 PtCu 纳米管
DOI：
10.1016/j.ijhydene.2021.11.215
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发表时间：
2022-01-29
影响因子：
7.2
通讯作者：
Yang, Xiaojing
中科院分区：
文献类型：
--
作者：
Du, Xihua;Sun, Shuo;Yang, Xiaojing
开发在酸性电解质环境中具有高活性和耐久性的氧还原反应（ORR）电催化剂仍然是清洁和高效能量转换的严峻挑战。Pt与廉价金属之间的协同效应、Pt的d带中心和催化剂的形貌可以调节Pt对氧中间体的吸附和脱附。这些因素都会影响Pt基纳米晶的催化性能。在这里，我们制备了Cu@PtCu3纳米线，Cu的平均直径为74.9 nm，PtCu 3层的平均直径为10 nm。在蚀刻之后，由于从表面和内部去除铜，Cu@PtCu3纳米线转变为PtCu纳米管结构。由于结构优势和协同效应的整合，用于ORR的PtCu NTs显示出优异的活性和耐久性。值得注意的是，PtCu NT（0.105 A mgxe 003; 1 Pt和0.230 mA cmxe 003; 2 Pt）的质量活性和比活性比商业Pt/C（0.053 A mgxe 003; 1 Pt和0.06 mA cmxe 003; 2 Pt）高2.0和3.8倍。蚀刻过程中改变催化剂的形态和改变催化剂的电子结构，预计将是有用的未来结构的Pt基合金纳米催化剂的设计。(c)2021年氢能出版有限责任公司。由爱思唯尔有限公司出版。保留所有权利。
The development of electrocatalysts with high activity and durability for oxygen reduction reaction (ORR) in acidic electrolyte environments remains a serious challenge for clean and efficient energy conversion. Synergistic effects between Pt and inexpensive metals, the d band center of Pt and catalyst morphology could adjust the adsorption and desorption of oxygen intermediates by the Pt. All the factors affect the catalytic performance of Pt-based nanocrystals. Here, we prepared Cu@PtCu3 NWs with an average diameter of 74.9 nm for Cu and about 10 nm PtCu3 layer. After etching, the Cu@PtCu3 nanowires is transformed into PtCu nanotube structure, due to the removal of copper from the surface and interior. PtCu NTs for ORR shows excellent activities and durability due to the integration of structural advantages and synergistic effects. Notably, the mass activity and specific activity of PtCu NTs (0.105 A mgxe003;1Pt and 0.230 mA cmxe003;2Pt) are 2.0 and 3.8 times higher than that of commercial Pt/C (0.053 A mgxe003;1Pt and 0.06 mA cmxe003;2Pt). The etching process to change the morphology of the catalyst and alter the electronic structure of the catalyst is expected to be useful for the design of future structured Pt-based alloy nanocatalysts. (c) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.