Carbon-Heteroatom Bond Formation by an Ultrasonic Chemical Reaction for Energy Storage Systems
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- Carbon-Heteroatom Bond Formation by an Ultrasonic Chemical Reaction for Energy Storage Systems
- Kim, Hyun-Tak; Shin, HyeonOh; Jeon, In-Yup; Yousaf, Masood; Baik, Jaeyoon; Cheong, Hae-Won; Park, Noejung; Baek, Jong-Beom; Kwon, Tae-Hyuk
- Issue Date
- WILEY-V C H VERLAG GMBH
- ADVANCED MATERIALS, v.29, no.47, pp.1701747 -
- The direct formation of C[BOND]N and C[BOND]O bonds from inert gases is essential for chemical/biological processes and energy storage systems. However, its application to carbon nanomaterials for improved energy storage remains technologically challenging. A simple and very fast method to form C[BOND]N and C[BOND]O bonds in reduced graphene oxide (RGO) and carbon nanotubes (CNTs) by an ultrasonic chemical reaction is described. Electrodes of nitrogen- or oxygen-doped RGO (N-RGO or O-RGO, respectively) are fabricated via the fixation between N2 or O2 carrier gas molecules and ultrasonically activated RGO. The materials exhibit much higher capacitance after doping (133, 284, and 74 F g−1 for O-RGO, N-RGO, and RGO, respectively). Furthermore, the doped 2D RGO and 1D CNT materials are prepared by layer-by-layer deposition using ultrasonic spray to form 3D porous electrodes. These electrodes demonstrate very high specific capacitances (62.8 mF cm−2 and 621 F g−1 at 10 mV s−1 for N-RGO/N-CNT at 1:1, v/v), high cycling stability, and structural flexibility.
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