Vanadium oxide thin film formation on graphene oxide by microexplosive decomposition of ammonium peroxovanadate and its application as a sodium ion battery anode

• Main Authors: Mikhaylov, Alexey A., Medvedev, Alexander G., Grishanov, Dmitry A., Sladkevich, Sergey, Gun, Jenny, Prikhodchenko, Petr V., Xu, Jason Zhichuan, Nagasubramanian, Arun, Srinivasan, Madhavi, Lev, Ovadia
• Other Authors: Singapore-HUJ Alliance for Research and Enterprise
• Format: Article
• Language: English
• Published: 2020
• Subjects: Engineering::Electrical and electronic engineering; Oxides; Two Dimensional Materials
• Online Access: https://hdl.handle.net/10356/142082
• Institution: Nanyang Technological University

Formation of vanadium oxide nanofilm-coated graphene oxide (GO) is achieved by thermally induced explosive disintegration of a microcrystalline ammonium peroxovanadate-GO composite. GO sheets isolate the microcrystalline grains and capture and contain the microexplosion products, resulting in the deposition of the nanoscale products on the GO. Thermal treatment of the supported nanofilm yields a sequence of nanocrystalline phases of vanadium oxide (V3O7, VO2) as a function of temperature. This is the first demonstration of microexplosive disintegration of a crystalline peroxo compound to yield a nanocoating. The large number of recently reported peroxide-rich crystalline materials suggests that the process can be a useful general route for nanofilm formation. The V3O7@GO composite product was tested as a sodium ion battery anode and showed high charge capacity at high rate charge-discharge cycling (150 mAh g-1 at 3000 mA g-1 vs 300 mAh g-1 at 100 mA g-1) due to the nanomorphology of the vanadium oxide.