Graphitic carbon nitride (g-CN) behaving as a layered feature with graphite was indexed as a high-content nitrogen-doping carbon material, attracting increasing attention for application in energy storage devices. However, poor conductivity and resulting serious irreversible capacity loss were pronounced for g-CN material due to its high nitrogen content. In this work, magnesiothermic denitriding technology is demonstrated to reduce the nitrogen content of g-CN (especially graphitic nitrogen) for enhanced lithium storage properties as lithium ion battery anodes. The obtained nitrogen-deficient g-CN (ND-g-CN) exhibits a thinner and more porous structure composed of an abundance of relatively low nitrogen doping wrinkled graphene nanosheets. A highly reversible lithium storage capacity of 2753 mAh/g was obtained after the 300th cycle with an enhanced cycling stability and rate capability. The presented nitrogen-deficient g-CN with outstanding electrochemical performances may unambiguously promote the application of g-CN materials in energy-storage devices.
Novel g-CN/CoO nanocomposite application for photocatalytic H evolution were designed and fabricated for the first time in this work. The structure and morphology of g-CN/CoO were investigated by a wide range of characterization methods. The obtained g-CN/CoO composites exhibited more-efficient utilization of solar energy than pure g-CN did, resulting in higher photocatalytic activity for H evolution. The optimum photoactivity in H evolution under visible-light irradiation for g-CN/CoO composites with a CoO mass content of 0.5 wt % (651.3 μmol h g) was up to 3 times as high as that of pure g-CN (220.16 μmol h g). The remarkably increased photocatalytic performance of g-CN/CoO composites was mainly attributed to the synergistic effect of the junction or interface formed between g-CN and CoO.
A new synthetic strategy (Al-compensation method) for LNCA cathodes is proposed in this paper. As a result, the obtained LNCA electrodes exhibit a more stable layered structure and enhanced electrochemical performances.
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