Defect-rich bimetallic yolk–shell metal-cyanide frameworks as efficient electrocatalysts for oxygen evolution reactions
| Autor: | Feng Weihang, Jia Wang, Chen Junsheng, Feng Liangliang, Yongqiang Feng, Jianfeng Huang, Chaozheng He, Wang Hai, Xiao Wang, Liyun Cao, Dong Peipei |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Polyvinylpyrrolidone Renewable Energy Sustainability and the Environment Cyanide Rational design Oxygen evolution 02 engineering and technology General Chemistry Overpotential 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Metal chemistry.chemical_compound Chemical engineering chemistry visual_art visual_art.visual_art_medium medicine General Materials Science Density functional theory 0210 nano-technology Bimetallic strip medicine.drug |
| Zdroj: | Journal of Materials Chemistry A. 9:2135-2144 |
| ISSN: | 2050-7496 2050-7488 |
| Popis: | 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 Co3[FeIII(CN)6]2 to Co2FeII(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. |
| Databáze: | OpenAIRE |
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