Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 16, Pages 18683-18692Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c00579
Keywords
cationic doping; transition-metal chalcogenides; metal-nitrogen-carbon; oxygen electrocatalysis; metal-air battery
Funding
- National Natural Science Foundation of China [21771069, 21874051, 51772110]
- Innovation Research Funds of Huazhong University of Science Technology [2017KFXJJ164]
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This study demonstrates a facile cationic-doping strategy for preparing nickel-doped cobalt sulfide nanocomposites with enhanced catalytic performance for oxygen electrocatalysis.
Transition-metal sulfide is pursued for replacing scare platinum-group metals for oxygen electrocatalysis and is of great importance in developing low-cost, high-performance rechargeable metal-air batteries. We report herein a facile cationic-doping strategy for preparing nickel-doped cobalt sulfide embedded into a mesopore-rich hydrangea-like carbon nanoflower. Nickel cations are introduced to induce the formation of Co3+-active species and more oxygen vacancies due to higher electronegativity and smaller ionic radius, thereby strengthening the intrinsic activity for oxygen electrocatalysis. Moreover, hydrangea-like superstructure composed of interconnected carbon cages provides abundant accessible active sites and hierarchical porosity. As a result, it shows excellent catalytic performance with a superior mass activity for the oxygen reduction reaction to the state-of-the-art Pt/C catalyst and a low overpotential of 314 mV at 10 mA cm(-2) for the oxygen evolution reaction. When used as an air cathode for the rechargeable Zn-air battery, it delivers a peak power density of 96.3 mW cm(-2) and stably operates over 214 h. This work highlights the importance of cationic doping in strengthening the electrocatalytic performance of 3d-transition-metal chalcogenides.
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