材料科学
石墨烯
电催化剂
催化作用
化学工程
氧化物
纳米复合材料
锐钛矿
腐蚀
碳纤维
氧化剂
纳米颗粒
纳米技术
复合材料
电化学
电极
光催化
化学
冶金
复合数
有机化学
工程类
物理化学
作者
Jing Liu,Jie Jin Wang,Jie Gao,Zhen Sun,Chaohua Fan,Xuejing Cui,Luhua Jiang
标识
DOI:10.1016/j.jallcom.2022.164435
摘要
• Few-layered nitrogen-doped graphene wrapped 3D flower-like TiO 2 is synthesized. • The anti-corrosion support has a high surface area and electronic conductivity. • Pt-TiO 2 @N-Gr-800 exhibits superior ORR activity, stability, and CO tolerance. • Pt-TiO 2 @N-Gr-800 shows a strong metal and support interaction. Carbon materials are commonly used as electrocatalyst supports in fuel cells. Nevertheless, carbon corrosion is a severe concern under strong acidic and oxidizing environments. Hence, developing a robust catalyst support is critical to ensuring fuel cells stability. Herein, we report a unique support of few-layered nitrogen-doped graphene wrapped three-dimensional (3D) flower-like anatase TiO 2 (TiO 2 @N-Gr) via in-situ polymerizing dopamine on the surface of a 3D-TiO 2 flower precursor, followed by pyrolysis. After loading Pt nanoparticles, Pt-TiO 2 @N-Gr-800 exhibits comparable ORR activity to the commercial Pt/C catalyst (E 1/2 = 0.91 V RHE ), superior stability in a 30 K cycling stability test and strong CO resistance capability. The outstanding performance of the Pt-TiO 2 @N-Gr-800 catalyst is attributed to the strong anti-corrosion property and high electronic conductivity of the nanocomposite support, as well as a strong metal and support interaction. The unique flower-like scaffold is also of great advantage for mass transfer. This work provides a facile strategy to synthesize robust nanocomposite supports for fuel cells.
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