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The High‐Performance Bifunctional Catalyst Pd/Ti3C2Tx–Carbon Nanotube for Oxygen Reduction Reaction and Hydrogen Evolution Reaction in Alkaline Medium
Energy Technology ( IF 3.6 ) Pub Date : 2020-05-30 , DOI: 10.1002/ente.202000306
Peng Zhang 1 , Ranran Wang 1 , Tao Xiao 1 , Zhou Chang 1 , Zhongwei Fang 1 , Zuolei Zhu 1 , Chenxi Xu 1 , Lianchao Wang 1 , Jigui Cheng 1
Affiliation  

The metal–support interaction offers electronic, compositional, and geometric effects that can enhance the catalytic activity and stability. Herein, a performance‐enhanced electrocatalyst of Pd nanoparticles loaded on a hybrid catalytic support comprised of MXene (Ti3C2Tx ) and carbon nanotube (CNT) is demonstrated. Such a hybrid catalyst enhances durability and improves both oxygen reduction reaction (ORR) and hydrogen evolution reaction (HER) activities compared with the Pd/C catalysts. The mass specific activity and specific activity of the Pd/Ti3C2Tx –CNT catalyst are 4.4 and 3.3 times that of Pd/C for ORR, respectively. The peak power density of a alkaline anion exchange membrane fuel cell (AAEMFC) based on the Pd/Ti3C2Tx –CNT (1:2) cathode achieves 48 mW cm−2 at 60 °C. Furthermore, Pd/Ti3C2Tx –CNT also exhibits rapid HER kinetics with a low overpotential of 158 mV at 10 mA cm−2 and a Tafel slope of 50 mV dec−1. Pd/Ti3C2Tx –CNT also provides good stability after 1000 cycles. These remarkable catalytic performances are attributed to the role of Ti3C2Tx and CNT by enhancing the catalytic activity surface area and rapid mass/charge transfer due to the synergistic effect between Pd and Ti3C2Tx –CNT.

中文翻译:

高性能双功能催化剂Pd / Ti3C2Tx-碳纳米管在碱性介质中的氧还原反应和氢释放反应

金属与载体之间的相互作用提供了电子,成分和几何效应,可以增强催化活性和稳定性。本文展示了负载在由MXene(Ti 3 C 2 T x)和碳纳米管(CNT)组成的混合催化载体上的Pd纳米粒子的性能增强的电催化剂。与Pd / C催化剂相比,这样的杂化催化剂提高了耐久性并改善了氧还原反应(ORR)和析氢反应(HER)的活性。Pd / Ti 3 C 2 T x的质量比活度和比活度–CNT催化剂的ORR分别是Pd / C的4.4和3.3倍。基于Pd / Ti 3 C 2 T x -CNT(1:2)阴极的碱性阴离子交换膜燃料电池(AAEMFC)的峰值功率密度在60°C时达到48 mW cm -2。此外,Pd / Ti 3 C 2 T x -CNT还表现出快速的HER动力学,在10 mA cm -2时低过电势为158 mV,Tafel斜率为50 mV dec -1。Pd / Ti 3 C 2 T x –CNT在1000次循环后也具有良好的稳定性。这些卓越的催化性能归因于Ti 3 C的作用由于Pd和Ti 3 C 2 T x –CNT之间的协同作用,通过提高催化活性表面积和快速的质荷转移,可实现2 T x和CNT的合成。
更新日期:2020-07-02
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