Bimetallic ZnCo zeolitic imidazolate framework/polypyrrole-polyaniline derived Co/N-doped carbon for oxygen reduction reaction. (8th June 2020)

• Record Type: Journal Article
• Authors: Tan, Jiabin; He, Xiaobo; Yin, Fengxiang; Chen, Biaohua; Liang, Xin; Li, Guoru; Yin, Huaqiang
• Is Part Of: International journal of hydrogen energy. Volume 45:Number 31(2020)
• Page Start: 15453
• Page End: 15464
• Publication Date: 2020-06-08
• Subjects: Electrocatalysis -- Oxygen reduction reaction -- Metal-organic-frameworks -- Polypyrrole -- Polyaniline; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2020.04.018
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Non-noble-metal based materials with high activity for oxygen reduction reaction (ORR) are urgently required to substitute Pt-based materials. Herein, metallic Co/N-doped carbon electrocatalysts were synthesized via a facile pyrolysis method of bimetal ZIF(ZnCo)/polypyrrole-polyaniline (ppy-pani) precursors. The evaporation of Zn and the introduced ppy-pani can lead to the porous structure and effectively hinder the aggregation of Co species, which results in the small nanoparticles uniformly distributed on carbon matrices. A high ECSA and a high content of Co species are obtained after the introduction of ppy-pani, thus resulting in the abundant Co 2+ species to enhance ORR. Therefore, the optimized ZIF/ppy-pani-750 exhibits a high E 1/2 (~0.86 V) and a low Tafel slope (~43.6 mV dec −1 ). Highlights: The introduced ppy-pani helps Co nanoparticles with small and uniform sizes. High ECSA and high contents of active Co species are achieved for ORR. The optimized ZIF/ppy-pani-750 show high ORR activity and durability.