The High‐Performance Bifunctional Catalyst Pd/Ti3C2Tx–Carbon Nanotube for Oxygen Reduction Reaction and Hydrogen Evolution Reaction in Alkaline Medium. Issue 7 (8th June 2020)

• Record Type: Journal Article
• Authors: Zhang, Peng; Wang, Ranran; Xiao, Tao; Chang, Zhou; Fang, Zhongwei; Zhu, Zuolei; Xu, Chenxi; Wang, Lianchao; Cheng, Jigui
• Is Part Of: Energy technology. Volume 8:Issue 7(2020:Jul.)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-06-08
• Subjects: bifunctional catalysts -- hybrid catalytic supports -- MXene -- synergistic effects; Energy development -- Periodicals; Power resources -- Periodicals; 333.79
• DOI: 10.1002/ente.202000306
• Languages: English
• ISSNs: 2194-4288

Abstract

Abstract : 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 (Ti3 C2 T x ) 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/Ti3 C2 T x –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/Ti3 C2 T x –CNT (1:2) cathode achieves 48 mW cm −2 at 60 °C. Furthermore, Pd/Ti3 C2 T x –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/Ti3 C2 T x –CNT also provides good stability after 1000 cycles. These remarkable catalytic performances are attributed to the role of Ti3 C2 T x and CNT by enhancing the catalytic activity surface area and rapid mass/charge transfer due to the synergistic effect between Pd and Ti3 C2 T x –CNT. Abstract : The mass activity of Pd/Ti3 C2 T x –carbon nanotube (CNT) is 4.4 times than that of Pd/C for oxygen reduction reaction (ORR) in alkaline medium. Pd/Ti3 C2 T x –CNT also exhibits a low overpotential of 158 mV at 10 mA cm −2 for hydrogen evolution reaction (HER). The Pd‐based electrocatalyst possesses extraordinary electrocatalytic properties for both ORR and HER due to the synergistic effects of Ti3 C2 T x and CNT.