A highly active Pt nanocatalysts supported on RuO2 modified TiO2-NTs for methanol electrooxidation with excellent CO tolerance
A highly active Pt nanocatalysts supported on RuO2 modified TiO2-NTs for methanol electrooxidation with excellent CO tolerance
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DOI：
10.1016/j.ijhydene.2019.10.048
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发表时间：
2019-11
影响因子：
7.2
通讯作者：
Jingnan Zheng;Kailu Huang;Guangya Hou;Zhang Huibin-;Huazhen Cao
中科院分区：
文献类型：
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作者：
Jingnan Zheng;Kailu Huang;Guangya Hou;Zhang Huibin-;Huazhen Cao
Pt催化剂因吸收一氧化碳而中毒失活是直接甲醇燃料电池（DMFC）中的一个重要问题。为了解决这一问题，本文提出了一种新型的纳米结构Pt催化电极，该电极以RuO 2修饰的TiO 2纳米管阵列（TiO 2-NTs）为载体负载Pt纳米催化剂。在真空条件下将RuCl 3溶胶填充到TiO 2-NTs的空隙中，然后热分解形成RuO 2/TiO 2-NTs载体，再通过脉冲电位电沉积法从H2 PtCl 6水溶液中负载Pt颗粒到RuO 2/TiO 2-NTs载体上。电化学测试结果表明，Pt/RuO 2/TiO 2-NTs上甲醇的氧化电流比Pt/TiO 2-NTs上的高得多。此外，Pt/RuO 2/TiO 2-NTs上的电流衰减也随着扫描周期的增加而减小。Pt/RuO 2/TiO 2-NTs电极中RuO 2的质量分数为8 g m− 2 RuO 2时，Pt/RuO 2/TiO 2-NTs电极的性能最稳定，表明RuO 2具有较强的抗CO中毒作用。在奈奎斯特图中，第一象限出现一个代表剥夺H原子作用的电容弧，第四象限出现一个代表剥夺CO作用的电感弧。由拟合结果可知，在600 mV偏压下，反应电阻Rct和电感L均随RuO 2含量的增加而减小，CO氧化是反应的速率控制步骤.
Poisoning devitalization of Pt catalyst caused by the absorption of carbon monoxide is an important issue in direct Methanol Fuel Cell (DMFC). To solve this problem, this work introduced a novel nano-structured Pt catalytic electrode, in which RuO2modified TiO2nanotube arrays (TiO2-NTs) was used as a carrier for the load of Pt nanocatalysts. Specifically, RuCl3sol was filled into the voids of TiO2-NTs under vacuum condition, followed by thermal decomposition to form RuO2/TiO2-NTs support, and then Pt particles were loaded on the RuO2/TiO2-NTs support by pulse potential electrodeposition from H2PtCl6aqueous solution. The electrochemical results show that the methanol oxidation current on Pt/RuO2/TiO2-NTs is much higher than that on Pt/TiO2-NTs. In addition, the current attenuation on Pt/RuO2/TiO2-NTs with the increased scan cycle is also decreased. The Pt/RuO2/TiO2-NTs electrode with 8 g m−2RuO2exhibits the most stable performance, indicating a strong effects of anti CO poisoning endowed by RuO2. In Nyquist diagrams, one capacitance arc representing the action of deprivation of H atom appears in the first quadrant and one inductance arc representing the action of deprivation of CO appears in the fourth quadrant. From the fitting results, both the reaction resistance Rctand the inductance L decrease with the argument of RuO2content under bias potential of 600 mV, and in this case CO oxidation is the rate controlling step.