Microwave-assisted synthesis of nano petal-like α-Ni(OH)2/RGO and its electrochemical performance

• Published in: Journal of alloys and compounds 2019-06, Vol.788, p.183-190
• Main Authors: He, Wenxiu, Qiu, Hengrui, Meng, Jing, Liu, Bin, Cui, Jinlong, Zhang, Yongqiang
• Format: Article
• Language: English
• Subjects: Anchoring; Batteries; Composite material; Electrochemical analysis; Electrochemical properties; Electrode materials; Electrodes; Graphene; Ion diffusion; Microwave method; Nanoscale petal-like α-Ni(OH)2/RGO; Nickel compounds; Rechargeable batteries
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2019.02.111

A nanoscale petal-like α-Ni(OH)2/reduced graphene oxide (α-Ni(OH)2/RGO) composite was synthesized with the one-step microwave method. α-Ni(OH)2 particles with sizes of approximately 200 nm are uniformly distributed on the reduced graphene oxide sheet in the sample. When used as an electrode for alkaline rechargeable batteries, the discharge capacity of the α-Ni(OH)2/RGO composite reaches 333.5 mAh/g at 0.2C and 247.1 mAh/g at 10 C, respectively, with an excellent rate capability. After 2000 cycles, the capacity of the electrode is insignificantly attenuated, indicating a high capacity retention and cycling stability. The outstanding electrochemical properties are attributed to the nanoscale petal-like structure α-Ni(OH)2 anchoring on the RGO sheets, which facilitates ion diffusion and increases the active surface, which is effectively reacting with the electrolyte. The nanoscale petal-like electrode material fabricated in this study provides clues to address the problem of energy applications of high-performance alkaline rechargeable batteries. •Petal-like α-Ni(OH)2/RGO is prepared by one-step microwave method.•RGO plays an important role in determining the morphology of α-Ni(OH)2/RGO.•Compared to Ni(OH)2, petal-like α-Ni(OH)2/RGO has a superior electrochemical property.•Discharge capacity reaches 333.5 and 247.1 mAh/g at 0.2 C and 10 C, respectively.