An Xiuyun, Zhu Weili, Tang Chunjuan, Liu Lina, Chen Tianwei, Wang Xiaohu, Zhao Jianguo, Zhang Guanhua
Department of Mathematics and Physics, Luoyang Institute of Science and Technology, Luoyang 471023, China.
State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, China.
Molecules. 2022 Aug 25;27(17):5472. doi: 10.3390/molecules27175472.
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 in 1.0 M KOH electrolyte with a small Tafel slope of 57.9 mV dec, and the compound material exhibits high durability lasting for 40 h.
普鲁士蓝类似物（PBA）具有三维开放骨架和丰富的不饱和表面配位原子，因其制备简便、成本低廉且成分可调，在电化学能源相关领域引起了广泛的研究兴趣。然而，由于其电荷传输能力和电化学稳定性较差，直接将PBA用作析水电催化剂仍然是一项挑战。在此，基于结构工程构建了PBA/rGO异质结构。石墨烯不仅提高了复合材料的电荷转移效率，还为PBA提供了受限的生长位点。此外，异质结构界面之间的电荷转移相互作用促进了复合材料的电催化析氧反应，这一点通过电化学测量结果得到了证实。在1.0 M KOH电解液中，PBA/rGO材料在电流密度为30 mA cm时的过电位仅为331.5 mV，塔菲尔斜率小至57.9 mV dec，且该复合材料表现出长达40 h的高耐久性。
