Enhanced Electrochemical Water Oxidation Activity by Structural Engineered Prussian Blue Analogue/rGO Heterostructure
Xiuyun An,
Weili Zhu,
Chunjuan Tang,
Lina Liu,
Tianwei Chen,
Xiaohu Wang,
Jianguo Zhao,
Guanhua Zhang
Affiliations
Xiuyun An
Department of Mathematics and Physics, Luoyang Institute of Science and Technology, Luoyang 471023, China
Weili Zhu
Department of Mathematics and Physics, Luoyang Institute of Science and Technology, Luoyang 471023, China
Chunjuan Tang
Department of Mathematics and Physics, Luoyang Institute of Science and Technology, Luoyang 471023, China
Lina Liu
Department of Mathematics and Physics, Luoyang Institute of Science and Technology, Luoyang 471023, China
Tianwei Chen
State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, China
Xiaohu Wang
State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, China
Jianguo Zhao
College of Physical & Electronic Information, Luoyang Normal University, Luoyang 471934, China
Guanhua Zhang
State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, China
Prussian blue analogue (PBA), with a three-dimensional open skeleton and abundant unsaturated surface coordination atoms, attracts extensive research interest in electrochemical energy-related fields due to facile preparation, low cost, and adjustable components. However, it remains a challenge to directly employ PBA as an electrocatalyst for water splitting owing to their poor charge transport ability and electrochemical stability. Herein, the PBA/rGO heterostructure is constructed based on structural engineering. Graphene not only improves the charge transfer efficiency of the compound material but also provides confined growth sites for PBA. Furthermore, the charge transfer interaction between the heterostructure interfaces facilitates the electrocatalytic oxygen evolution reaction of the composite, which is confirmed by the results of the electrochemical measurements. The overpotential of the PBA/rGO material is only 331.5 mV at a current density of 30 mA cm−2 in 1.0 M KOH electrolyte with a small Tafel slope of 57.9 mV dec−1, and the compound material exhibits high durability lasting for 40 h.
