Cold plasma synthesis of phosphorus-doped CoFe 2 O 4 with oxygen vacancies for enhanced OER activity.
Dapeng MengXiangfeng PengJingxuan ZhengZhao WangPublished in: Physical chemistry chemical physics : PCCP (2023)
Spinel-type metal oxides are promising electrocatalysts for the oxygen evolution reaction (OER) due to their unique electronic structure and low cost. Herein, we induced oxygen vacancies and doped phosphorus into CoFe 2 O 4 using cold plasma. The abundant oxygen vacancies enhanced hydrophilicity and modified the electronic structure of CoFe 2 O 4 , while the phosphorus doping formed numerous new active centers. The doped P and formed FeP promoted the charge transfer and improved the conductivity of the catalyst. The phosphorus-doped CoFe 2 O 4 exhibited exceptional OER activity with an overpotential of 180 mV at 10 mA cm -2 and a Tafel slope of 65.8 mV dec -1 in an alkaline electrolyte. DFT calculations confirmed that phosphorus doping can improve the charge distribution near the Fermi level and optimize the d-band center position.
Keyphrases
- quantum dots
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