Alkali conversion of Ni-Co nanoarrays on carbon cloth for a high-capacity supercapacitor electrode

Shao, Xuecun; Zheng, Xiaoyu; Zou, Wenru; Luo, Yunli; Cen, Qingchun; Ye, Qinglan; Xu, Xuetang; Wang, Fan

doi:10.1016/j.electacta.2017.07.133

Cited by 37 publications

(6 citation statements)

References 46 publications

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“…These results indicate that balsa carbon/CNTs can achieve substantially enhanced capacitance after the introduction of CNTs. The balsa carbon/CNTs also holds significant advantage in areal capacitance among those of previously reported similar carbon-based composites (with a mass loading over 10 mg cm −2 ), such as graphene hydrogel (1000 mF cm −2 at 1 mA cm −2 ), [49] polypyrrolecoated graphene aerogel (1100 mF cm −2 at 1 mA cm −2 ), [50] Ni-Co nano arrays on carbon cloth (1470 mF cm −2 at 1 mA cm −2 ) [51] and Carbon/β-FeOOH (1502 mF cm −2 at 1 mA cm −2 ). [52] Such excellent areal capacitance benefits from the hierarchical porosity of balsa carbon and the highly conductive interwoven CNT networks, ensuring a high area mass loading of electroactive materials (31.2 mg cm −2 ).…”

Section: Resultsmentioning

confidence: 66%

Self‐Promoting Energy Storage in Balsa Wood‐Converted Porous Carbon Coupled with Carbon Nanotubes

Zia

et al. 2022

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For most electrodes fabricated with carbon, transition metal compounds, or conductive polymers, the capacitance may deteriorate with cyclic charging and discharging. Thus, an electrochemically stable supercapacitor has long been pursued by researchers. In this work, the hierarchical structure of balsa wood is preserved in the converted carbon which is used as a supporting framework to fabricate electrodes for supercapacitors. Well‐grown carbon nanotubes (CNTs) on interior and exterior surfaces of balsa carbon channels provide two advantages including 1) offering more specific surface area to boost capacitance via electric double layer capacitance and 2) offering more active Fe and Ni sites to participate in the redox reaction to enhance capacitance of the balsa carbon/CNTs electrode. The balsa carbon/CNTs demonstrate an excellent area capacitance of 1940 mF cm−2. As active sites on Ni and Fe catalysts and inner walls of CNTs are gradually released, the capacitance increases 66% after 4000 charge–discharge cycles. This work brings forward a strategy for the rational design of high‐performance biomass carbon coupled with advanced nanostructures for energy storage.

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Section: Resultsmentioning

confidence: 66%

Self‐Promoting Energy Storage in Balsa Wood‐Converted Porous Carbon Coupled with Carbon Nanotubes

Zia

et al. 2022

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“…The Ni 2p spectrum in Fig. 3d can be classified into spin-orbit doublets and shake-up satellites, corresponding to the http://engine.scichina.com/doi/10.1016/j.scib.2020.01.004 coexistence of Ni 3+ and Ni 2+ [42,43]. The results illustrate that the chemical compositions contain Ni 3+ , Ni 2+ , Co 3+ and Co 2+ [44].…”

Section: Resultsmentioning

confidence: 87%

Dual-functional NiCo2S4 polyhedral architecture with superior electrochemical performance for supercapacitors and lithium-ion batteries

et al. 2020

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“…In our previous work, we synthesized Ni–Co carbonate hydroxide nanowire arrays on a carbon cloth (CC) substrate, and converted them to Ni–Co hydroxide nanowire‐supported nanoplate arrays with enhanced capacitance and high CE upon soaking in alkaline solution for a certain period . The key point of this conversion is the spontaneous exchange between CO 3 2− and OH − in KOH solution, driven by the chemical potential difference.…”

Section: Introductionmentioning

confidence: 99%

Anion Exchange of Ni–Co Layered Double Hydroxide (LDH) Nanoarrays for a High‐Capacitance Supercapacitor Electrode: A Comparison of Alkali Anion Exchange and Sulfuration

Zou

Guo

Liu

et al. 2018

Chemistry A European J

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A facile and new anion exchange process is presented, which involves the conversion of NiCo‐CO3 layered double hydroxide (LDH) nanosheet arrays in an alkaline solution. The anion exchange between CO32− and OH− results in the construction of a reservoir for OH− anions, and the decoration of thin nanoflakes on the surface of nanosheets effectively enlarges the surface area of NiCo LDH nanoarrays. The capacitance of the as‐soaked NiCo LDH nanoarrays electrode increases from 1.78 F cm−2 (684 F g−1) to 6.22 F cm−2 (2391 F g−1) at 2 mA cm−2 after soaking for 12 h. Moreover, the soaked NiCo‐OH LDH electrode exhibits an enhanced rate capacity, high coulombic efficiency, and good cycling stability compared with the Ni–Co‐S nanosheet electrode synthesized through a hydrothermal sulfuration process. The as‐assembled all‐solid‐state NiCo LDH//active carbon asymmetric supercapacitor shows a maximum energy density of 83.4 W h kg−1 at a power density of 1066 W kg−1.

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Alkali conversion of Ni-Co nanoarrays on carbon cloth for a high-capacity supercapacitor electrode

Cited by 37 publications

References 46 publications

Self‐Promoting Energy Storage in Balsa Wood‐Converted Porous Carbon Coupled with Carbon Nanotubes

Self‐Promoting Energy Storage in Balsa Wood‐Converted Porous Carbon Coupled with Carbon Nanotubes

Dual-functional NiCo2S4 polyhedral architecture with superior electrochemical performance for supercapacitors and lithium-ion batteries

Anion Exchange of Ni–Co Layered Double Hydroxide (LDH) Nanoarrays for a High‐Capacitance Supercapacitor Electrode: A Comparison of Alkali Anion Exchange and Sulfuration

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