期刊
ELECTROCHIMICA ACTA
卷 250, 期 -, 页码 320-326出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2017.08.073
关键词
N-doped graphene forest; electrical double-layer capacitor; plasma enhanced chemical vapor deposition; wearable supercapacitor
资金
- National Research Foundation of Korea (NRF) grant - Korea government (MSIP) [2015R1C1A2A01053115]
- National Research Foundation of Korea [2015R1C1A2A01053115] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Recently, a graphene forest (GF) is synthesized by a plasma enhanced chemical vapor deposition (PECVD) process, which subverts the stereotyped morphology of vertical graphene. The GF is demonstrated to possess excellent performance in flexible and bendable electrical double-layer capacitors (EDLCs). In this work, synthesis process of the GF has been optimized and N-doped GF is successfully achieved by introducing NH3 as the nitrogen precursor during the PECVD process. The N-doping obviously affects the morphology of the GF and the in-plane conductivity of GF is desirably enhanced. The specific area capacitances and volumetric capacitances of N-doped GF-based EDLC increases 26% and 89% in average, respectively, at different current densities compared with the non-doped GF-based EDLC. In addition, both the energy and power densities are improved, and impressively, the energy densities improve 87% by the N-doping of GF electrodes. The GF-based EDLC also provides the desirable stability that no degradation can be observed within 10,000 cycles. Finally, the flexible N-doped GF-based EDLC is also tested as a wearable supercapacitor, exhibiting no capacitance decrease under the dynamic bending situation. Our approach to synthesize the N-doped GF electrodes can achieve the fine-scale nano-structured GF electrodes and provide a new way forward for improved energy storage devices. (C) 2017 Elsevier Ltd. All rights reserved.
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