Advanced functional materials: high specific capacity hydrogen ion battery assisted by ultra high loading MoO3 electrode

Professor Zhao Chuan's research group of the University of New South Wales has realized the ultra-high area specific capacity (22.4 MAH cm-2) of hydrogen ion battery electrode by preparing high loading MoO3 electrode (more than 90 mgcm-2).
the MoO3 nanowires prepared by the research team are orthorhombic (PBNM space group a = 3.965 60 Å B = 13.873 00 Å C = 3.706 30 Å). The XRD results show that it is a layered structure with two possible hydrogen intercalation sites. TEM showed that the diameter of nanowires was about 200 nm the length was about 5 μ M. At low loading MoO3 electrode has excellent electrochemical hydrogen storage performance: three pairs of CV redox peaks the reaction kinetics is dominated by hydrogen ion diffusion. The reversible redox reaction between h2.0moo3 h1.1moo3 resulted in a high specific capacity (235 MAH g-1). The diffusion coefficient of hydrogen ion (3.27 x 10-10 cm2 s-1) is 30 times higher than that of lithium ion. Under high loading hydrogen ions diffuse rapidly in the thick electrode the thick electrode has good electronic conductivity so the area specific capacity of 94.16 mgcm-2 MoO3 electrode can reach 22.4 mahcm-2 which is much higher than that of most reported energy storage devices. The high loading electrode has good rate performance cycle stability (> 5000 cycles). The thick electrode of hydrogen ion battery in this study not only provides a new idea to achieve high area specific capacity but also lays a foundation for the development of energy storage devices with high energy density high power density. In this paper the high load electrode is prepared by simple traditional coating method which can not only greatly simplify the battery assembly process but also reduce the production cost which is of great significance for industrial mass production commercial application.
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