Electrosynthesis of dendritic palladium supported on Ti/TiO2NTs/Ni/CeO2 as high-performing and stable anode electrocatalyst for methanol electrooxidation
Electrosynthesis of dendritic palladium supported on Ti/TiO2NTs/Ni/CeO2 as high-performing and stable anode electrocatalyst for methanol electrooxidation
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DOI：
10.1016/j.ijhydene.2022.05.120
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发表时间：
2022-06
影响因子：
7.2
通讯作者：
Mai Xu;Fengzhen Wang;Liang Xian;M. Shehzad;Liangyu Wu;T. Xu
中科院分区：
文献类型：
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作者：
Mai Xu;Fengzhen Wang;Liang Xian;M. Shehzad;Liangyu Wu;T. Xu
液体燃料直接甲醇燃料电池（DMFC）在低碳交通方面极具前景，但受到传统铂基电催化剂成本高和寿命短的阻碍。在此，我们提出了一种新的无铂催化剂策略，以开发高性能且稳定的DMFC电催化剂，实现碱性介质中甲醇氧化反应（MOR）的增强电催化活性和高稳定性。通过简单的三步电沉积路线，无需使用任何模板或表面活性剂，成功制备了一种由钛/还原二氧化钛纳米管/镍/二氧化铈（Ti/r-TiO2NTs/Ni/CeO2）纳米载体和均匀分散的Pd枝晶组成的新型无Pt阳极催化剂。值得注意的是，所制备的 Ti/r-TiO2NTs/Ni/CeO2-Pd 作为阳极电极表现出比商业 Pd/C 和其他电极更优异的活性。对于 MOR，Ti/r-TiO2NTs/Ni/CeO2-Pd 电极获得的大质量活度为 1752 mA mgPd−1。经过连续 1000 次循环的 CV 测试后，Ti/r-TiO2NTs/Ni/CeO2-Pd 电极仍保留其初始电流的 88.9%。 Ti/r-TiO2NTs/Ni/CeO2-Pd的优越性能归因于大的表面积和优异的导电性，以及纳米载体和Pd枝晶之间的协同效应。因此，这项研究将为高性能燃料电池应用打开一扇新的大门。
Liquid-fueled direct methanol fuel cell (DMFC) is highly promising for low-carbon transportation, but is hindered by high cost and short lifespan of conventional Pt-based electrocatalysts. Herein, we propose a new Pt-free catalyst strategy to exploit high-performing and stable electrocatalyst of DMFC, achieving enhanced electrocatalytic activity and high stability for methanol oxidation reaction (MOR) in alkaline media. A new Pt-free anode catalysts consisting of titanium/reduced-titanium dioxide nanotubes/nickel/cerium dioxide (Ti/r-TiO2NTs/Ni/CeO2) nanosupport and uniformly-dispersed Pd dendrites is successfully prepared by a facile three-step electrodeposition route without applying any template or surfactant. Noticeably, the as-prepared Ti/r-TiO2NTs/Ni/CeO2–Pd as an anode electrode exhibits superior activity than commercial Pd/C and other electrodes. The obtained large mass activity for Ti/r-TiO2NTs/Ni/CeO2–Pd electrode is 1752 mA mgPd−1for MOR. After successive CV tests of 1000 cycles, Ti/r-TiO2NTs/Ni/CeO2–Pd electrode still retained 88.9% of its initial current. The superior performance of Ti/r-TiO2NTs/Ni/CeO2–Pd attributes to the large surface area and excellent conductivity, as well as the synergistic effects among nanosupport and Pd dendrites. Therefore, this study will open a new door for high-performance fuel cell applications.