SubPc-Br/NiMoO 4 composite as a high-performance supercapacitor electrode materials
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RESEARCH ARTICLE
SubPc‑Br/NiMoO4 composite as a high‑performance supercapacitor electrode materials Bing‑Bing Zhang1 · Hong Hao1,2 · Fen‑Yan Zhang1,2 · Bing Wang1 · Jia Xue1 · Lin‑Yu Jiao1,2 · Zhuo Li1,2 Received: 24 March 2020 / Accepted: 13 July 2020 © Springer Nature B.V. 2020
Abstract In the present paper, a facile hydrothermal synthesis was successfully used to obtain a novel SubPhthalocyanine/Nickel molybdate (SubPc-Br/NiMoO4) composite electrode material for a higher-performance super-capacitor. SEM and XRD investigations revealed that SubPc-Br particles were uniformly dispersed on the surface of NiMoO4 microspheres and kept the crystal formation of NiMoO4 during the combination of SubPc-Br and NiMoO4, giving the possibility to obtain high power density. The excellent pseudo-capacitance properties of SubPc-Br/NiMoO4 were also confirmed by a series of electrochemical experiments and showed that SubPc-Br significantly enhanced the redox strength and charge transfer characteristics of the NiMoO4. The as-prepared electrode had a high specific capacitance of 1292 F g−1 at a scan rate of 1 mV s−1. Additionally, in comparison with a separate NiMoO4, the cycle stability of the SubPc-Br/NiMoO4 super-capacitor is improved by 12.9% after 1000 cycles. The enhanced performances could be mainly attributed to the unique nanostructure and a larger contact area of SubPc-Br/NiMoO4. The materials obtained using this technique and the unique properties of cycle stability are attractive. This technique has an increased potential to enlarge the applicability of the electrochemical industry.
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10800-020-01455-8) contains supplementary material, which is available to authorized users. Extended author information available on the last page of the article
13
Vol.:(0123456789)
Journal of Applied Electrochemistry
Graphic abstract
Keywords Subphthalocyanine · Nickel molybdate · Cycle stability · Capacitance
1 Introduction The urgent demand for new and efficient energy storage devices [1] is gradually increasing with the decrease of nonrenewable resource reserves and the environmental pollution problems. Among the environmental-friendly energy storage devices, super-capacitors have been intensively studied in development of new energy storage devices [2], electronic products [3], and energy storages devices for electric vehicle development [4], owing to their attractive properties of high power density, high cycle stability and fast charging capability [5]. However, at the level of practical applications and development of super-capacitors, some technical restrictions can be found, mainly due to their relatively low energy density. Enhancing the energy density of these devices becomes one of the most crucial challenges for super-capacitors to achieve an excellent electrochemical performance [6–8]. A well-known pathway to increase the energy density of capacitors [9] is the design and enhancement of high-performance electr
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