CoSe2/Co nanoheteroparticles embedded in Co, N co-doped carbon nanopolyhedra/nanotubes as an efficient oxygen bifunctional electrocatalyst for Zn–air batteries. Issue 9 (20th July 2020)

• Record Type: Journal Article
• Authors: Zou, Jizhao; Luo, Qi; Wu, Hongliang; Liu, Shiyu; Lan, Tongbin; Yao, Yuechao; Sial, Muhammad Aurang Zeb Gul; Zhao, Fenglin; Zhang, Qi; Zeng, Xierong
• Is Part Of: Sustainable energy & fuels. Volume 4:Issue 9(2020)
• Page Start: 4722
• Page End: 4732
• Publication Date: 2020-07-20
• Subjects: Renewable energy sources -- Periodicals; Fuel cells -- Periodicals; Electric batteries -- Periodicals; Electrochemistry -- Periodicals; 660.297
• DOI: 10.1039/d0se00019a
• Languages: English
• ISSNs: 2398-4902

Abstract

Abstract : CoSe2 /Co nanoheteroparticles embedded within hierarchically porous Co, N co-doped carbon nanopolyhedra/nanotubes (CoSe2 /Co@NC-CNTs) made by hybrid Zn/Co zeolitic imidazole framework, through facile controlled carbonization and selenization procedures. Abstract : Transition metal selenide-based materials have been demonstrated as promising electrocatalysts for the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), yet the actual design of a highly efficient and stable electro-catalyst based on these materials still remains a long and arduous challenge. Herein, a predesigned hybrid Zn/Co zeolitic imidazole framework was used to fabricate CoSe2 /Co nanoheteroparticles embedded within hierarchically porous Co, N co-doped carbonnanopolyhedra/nanotubes (CoSe2 /Co@NC-CNTs) through a facile approach involving controlled carbonization and selenization procedures. As expected, the optimized CoSe2 /Co@NC-CNT-1 displayed outstanding electrocatalytic performance for the ORR and OER, with an onset potential of 0.95 V vs. RHE, a half-wave potential of 0.84 V vs. RHE for ORR, and a potential of 1.69 V vs. RHE for OER at 10 mA cm −2 . It also exhibited excellent long-term stability and methanol resistance ability, which were superior to commercial IrO2 and the commercial 20 wt% Pt/C catalyst. Notably, the assembled Zn–air battery with CoSe2 /Co@NC-CNT-1 showed a low charge–discharge voltage gap (0.696 V at 10 mA cm −2 ) and a high peak power density (100.28 mW cm −2 ) with long-term cycling stability. These superior performances can be ascribed to the synergistic effects of the highly active CoSe2 /Co nanoheterostructure, hierarchically porous structure with a large surface area, high electrical conductivity and uniform doping of the Co and N.