| الملخص: | Due to the issues of energy shortage and environmental pollution, it is crucial to explore environmentally friendly and efficient bifunctional catalysts for oxygen and hydrogen evolution reaction (OER/HER). Herein, we demonstrate an oxygen vacancy-rich NiO/NiMoO4 heterojunction as bifunctional catalyst for electrocatalytic water splitting (denoted as NiO/NiMoO4–x) on commercial nickel foam by a facile hydrothermal-calcination method. The experimental results and density functional theory calculations confirm that the constructed heterostructure and oxygen vacancies optimize the electronic band structure of NiO/NiMoO4–x with more electronic states near the Fermi level, which not only enhances its conductivity, but also promotes exposure of the active sites. Based on this, NiO/NiMoO4–x possesses an impressive OER overpotential of 332 mV and HER overpotential of 34 mV at 10 mA cm–2, simultaneously, a satisfactory stability after continuous operation for 165 h. This work affords valuable insights into the development of durable and inexpensive bifunctional catalysts for electrocatalytic water splitting.
|
|---|
