Simultaneous Modulation of Composition and Oxygen Vacancies on Hierarchical ZnCo2O4/Co3O4/NC‐CNT Mesoporous Dodecahedron for Enhanced Oxygen Evolution Reaction1. Issue 70 (12th November 2018)

• Record Type: Journal Article
• Authors: Ma, Yangde; Yang, Yang; Dai, Xiaoping; Luan, Xuebin; Yong, Jiaxi; Qiao, Hongyan; Zhao, Huihui; Cui, Meilin; Zhang, Xin; Huang, Xingliang
• Is Part Of: Chemistry. Volume 24:Issue 70(2018)
• Page Start: 18689
• Page End: 18695
• Publication Date: 2018-11-12
• Subjects: carbon -- doping -- electrochemistry -- metal–organic frameworks -- nanotubes; Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.201803399
• Languages: English
• ISSNs: 0947-6539

Abstract

Abstract: Electrochemical water splitting is a promising way for the sustainable production of hydrogen, but the efficiency of the overall water‐splitting reaction largely depends on the oxygen evolution reaction (OER) because of its sluggish kinetics. Herein, a series of hierarchical ZnCo2 O4 /Co3 O4 /NC‐CNT (NC‐CNT=nitrogen‐rich carbon nanotube) mesoporous dodecahedrons grafted to carbon nanotubes have been synthesized from ZnCo bimetallic zeolitic imidazolate frameworks (ZnCo‐ZIFs) through sequential pyrolysis in nitrogen and mild oxidation in air. The simultaneous modulation of oxygen vacancies, composition, and hierarchical mesoporous architecture remarkably enhanced their electronic conduction and the amount and reactivity of accessible actives; thus boosting their intrinsic activity in the OER. The optimal ZnCo2 O4 /Co3 O4 /NC‐CNT‐700 sample exhibited a large current density of 50 mA cm −2 at a potential of 1.65 V, a small Tafel slope of 88.5 mV dec −1, and superior stability in alkaline media. This work should provide a facile strategy for the rational design of advanced OER catalysts by simultaneous engineering of oxygen vacancies and composition. Abstract : Hard graft : Simultaneous modulation of oxygen vacancies and hierarchical mesoporous architecture in ZnCo2 O4 /Co3 O4 /NC‐CNT (NC‐CNT=nitrogen‐rich carbon nanotube; see figure) dodecahedrons derived from ZnCo bimetallic zeolitic imidazolate frameworks (ZnCo‐ZIFs) with grafted carbon nanotubes resulted in superior electrochemical properties towards the oxygen evolution reaction.