Defect-rich bimetallic yolk-shell metal-cyanide frameworks as efficient electrocatalysts for oxygen evolution reactions

The rational design and construction of noble-metal-free electrocatalysts with high activity and robust durability for oxygen evolution reactions (OERs) have aroused immense interest in the past decades, but challenges remain. Herein, a reduction-induced dissolution-recrystallization (RIDR) strategy...

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Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2021-02, Vol.9 (4), p.2135-2144
Main Authors: Feng, Yongqiang, Dong, Peipei, Cao, Liyun, Wang, Xiao, Wang, Jia, Wang, Hai, Feng, Weihang, Chen, Junsheng, Feng, Liangliang, He, Chaozheng, Huang, Jianfeng
Format: Article
Language:English
Subjects:
Bimetals
Cyanides
Density functional theory
Durability
Electrocatalysts
Isopropanol
Isopropyl alcohol
Noble metals
Oxygen
Oxygen evolution reactions
Phase transitions
Polyvinylpyrrolidone
Recrystallization
Yolk
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Summary:The rational design and construction of noble-metal-free electrocatalysts with high activity and robust durability for oxygen evolution reactions (OERs) have aroused immense interest in the past decades, but challenges remain. Herein, a reduction-induced dissolution-recrystallization (RIDR) strategy was developed to fabricate a defect-rich yolk-shell Prussian-blue analogue (YS-PBA) by a solvothermal process in isopropyl alcohol (IPA) in the presence of polyvinylpyrrolidone (PVP). The experimental result indicated that the defect-rich YS-PBA was formed via phase transformation from Co 3 [Fe III (CN) 6 ] 2 to Co 2 Fe II (CN) 6 induced by the reduction potential of the IPA-PVP couple. The newly synthesized YS-PBA exhibited outstanding OER performance with a low overpotential of 293 mV to deliver a current density of 10 mA cm −2 and long-term durability (120 h) in alkaline media. Both experimental and density functional theory (DFT) results unveiled that the defects formed in YS-PBA cause a dramatic positive effect on the improvement of the OER activity. A defect-rich yolk-shell Co-Fe Prussian-blue analogue was fabricated using a reduction-induced dissolution-recrystallization strategy, which exhibited enhanced OER performance in an alkaline medium.
ISSN:2050-7488
2050-7496
DOI:10.1039/d0ta09892b