A Robust PtNi Nanoframe/N‐Doped Graphene Aerogel Electrocatalyst with Both High Activity and Stability
Jing Yang, René Hübner, Jiangwei Zhang, Hao Wan, Yuanyuan Zheng, Honglei Wang, Haoyuan Qi, Lanqi He, Yi Li, Amare Aregahegn Dubale, Yujing Sun, Yuting Liu, Daoling Peng, Yuezhong Meng, Zhikun Zheng, Jan Rossmeisl, Wei Liu
Abstract
Abstract Insufficient catalytic activity and stability and high cost are the barriers for Pt‐based electrocatalysts in wide practical applications. Herein, a hierarchically porous PtNi nanoframe/N‐doped graphene aerogel (PtNiNF‐NGA) electrocatalyst with outstanding performance toward methanol oxidation reaction (MOR) in acid electrolyte has been developed via facile tert‐butanol‐assisted structure reconfiguration. The ensemble of high‐alloying‐degree‐modulated electronic structure and correspondingly the optimum MOR reaction pathway, the structure superiorities of hierarchical porosity, thin edges, Pt‐rich corners, and the anchoring effect of the NGA, endow the PtNiNF‐NGA with both prominent electrocatalytic activity and stability. The mass and specific activity (1647 mA mg Pt −1 , 3.8 mA cm −2 ) of the PtNiNF‐NGA are 5.8 and 7.8 times higher than those of commercial Pt/C. It exhibits exceptional stability under a 5‐hour chronoamperometry test and 2200‐cycle cyclic voltammetry scanning.