Carbon–Heteroatom Bond Formation by an Ultrasonic Chemical Reaction for Energy Storage Systems. Issue 47 (9th November 2017)

• Record Type: Journal Article
• Authors: Kim, Hyun‐Tak; Shin, HyeonOh; Jeon, In‐Yup; Yousaf, Masood; Baik, Jaeyoon; Cheong, Hae‐Won; Park, Noejung; Baek, Jong‐Beom; Kwon, Tae‐Hyuk
• Is Part Of: Advanced materials. Volume 29:Issue 47(2017)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2017-11-09
• Subjects: carbon–heteroatom bonds -- carbon nanomaterials -- energy storage systems -- ultrasonic chemistry; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adma.201702747
• Languages: English
• ISSNs: 0935-9648

Abstract

Abstract: The direct formation of CN and C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N and C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. Abstract : Direct CN and CO bond formation with N2 or O2 gases by chemical reactions in a simple ultrasonic spray process is essential in various carbon nanomaterials. The resulting N‐doped carbon nanomaterials display remarkable performance in energy‐storage applications. Furthermore, the double‐nozzle system used for ultrasonic deposition can produce a layer‐by‐layer nitrogen‐reduced graphene oxide/nitrogen‐doped carbon nanotube multidimensional carbon framework, which further improves the energy‐storage performance.