4.7 Article

Regulating electronic structure of hollow LaxCoyO4@NC by La incorporation for electrochemical oxygen evolution reaction

期刊

出版社

ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2022.116480

关键词

Metal-organic framework; Rare earth doping; Metallic oxide; Oxygen evolution reaction; Density functional theory

资金

  1. National Natural Science Foundation of China [21673081]
  2. Key Project of Guangdong Natural Science Foundation [2018B030311002]

向作者/读者索取更多资源

Hollow porous La-doped Co3O4 nanoparticles were successfully synthesized and exhibited enhanced OER activity and high durability. The controllable synthesis method provides a new strategy for high-performance OER electrocatalysis.
Developing efficient and low-cost electrocatalysts to substitute noble metals is crucial for oxygen evolution reaction (OER). Herein, we successfully synthesized hollow porous La-doped Co3O4 dodecahedral nanoparticles (LaxCoyO4@NC) through using ZIF-67 as precursor. Wherein, La could regulate electronic structure of Co3O4 and thus promotes the OER performance efficiently. La doped Co3O4 displays enhanced OER activity than pure Co3O4, as confirmed by experience results and density functional theory (DFT) calculation. Due to La doping, the ratio of Co2+ and Co3+ would increase obviously and generate new electronic states near the Fermi level. The La0.17Co2.83O4@NC exhibites excellent OER performance and high durability, which only requires an overpotential of 363 mV at the current density of 10 mA center dot cm-2 in alkaline medium and markedly outperforms Co3O4@NC (414 mV). These findings might provide a new strategy for controllable synthesis of transition metal nanocatalysts for high-performance OER electrocatalysis.

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