A nitrogen-doped NiCo2S4/CoO hollow multi-layered heterostructure microsphere for efficient oxygen evolution in Zn–air batteries

Autor:	Hong-Ke Liu, Chun-Yu Xu, Yi-Bo Li, Xiao-Yu Li, Qingli Hao, Juanjuan Song, Yawen Tang, Zhi Su, Bin He
Rok vydání:	2021
Předmět:	chemistry.chemical_classification Materials science Sulfide Annealing (metallurgy) Oxygen evolution Oxide Heterojunction Overpotential Catalysis Metal chemistry.chemical_compound chemistry Chemical engineering visual_art visual_art.visual_art_medium General Materials Science
Zdroj:	Nanoscale. 13:810-818
ISSN:	2040-3372 2040-3364
DOI:	10.1039/d0nr07120j
Popis:	Exploring highly effective and low-cost non-noble metal-based electrocatalysts for oxygen evolution reaction (OER) is critical for renewable energy conversion and metal-air batteries. Herein, a novel and high-efficient OER catalyst was reported with nitrogen-doped oxide/sulfide heterostructures (named N-NiCo2S4/CoO microsphere). The N-NiCo2S4/CoO microsphere was synthesized by annealing NiCo-BTC MOF to a multi-layered hollow structure of NiCo2O4 microspheres, followed by the direct vulcanization in the presence of NH4HCO3, resulting in an oxide/sulfide heterojunction. Benefiting from the nitrogen doping, the abundant multi-layered hollow heterostructure and the interfaces between multiple components, the N-NiCo2S4/CoO microsphere exhibited excellent OER activity with a low overpotential of 227 mV at 10 mA cm-2. The Zn-air battery based on the N-NiCo2S4/CoO + Pt/C catalyst displayed excellent cycling stability after 900 cycles at a large current density of 5 mA cm-2, where the commercial RuO2 + Pt/C-based battery exhibited a big drop after only 30 cycles, suggesting its great application prospects as power source devices.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0113bb7a4d72ea6abc8b4374653d98b0 https://doi.org/10.1039/d0nr07120j Zobrazit plný text záznamu