Clean preparation of V2O3 by one-step molten salt electrochemical reduction of soluble NaVO3

AbstractMassive deployment of lithium-ion battery inevitably causes a large amount of solid waste. To be sustainably implemented, technologies capable of reducing environmental impacts and recovering resources from spent lithium-ion battery have been an urgent task. The electrochemical reduction of LiNiO2 to metallic nickel has been reported, which is a typical cathode material of lithium-ion battery. In this paper, the electrochemical reduction behavior of LiNiO2 is studied at 750 °C in the eutectic NaCl-CaCl2 molten salt, and the constant cell voltage electrolysis of LiNiO2 is carried out. The results show that Ni(III) is reduced to metallic nickel by a two-step process, Ni(III) → Ni(II) → Ni, which is quasi-reversible controlled by diffusion and electron transfer. After electrolysis for 6 h at 1.4 V, the surface of LiNiO2 cathode is reduced to metallic nickel, with NiO and a small amount of Li0.4Ni1.6O2 detected inside the partially reduced cathode. After prolonging the electrolysis time to 12 h, LiNiO2 is fully electroreduced to metallic nickel, achieving a high current efficiency of 98.60%. The present work highlights that molten salt electrolysis could be an effective protocol for reclamation of spent lithium-ion battery.

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Fabrication of Janus GO/rGO humidity actuator by one-step electrochemical reduction route

Sensors and Actuators B Chemical ◽

10.1016/j.snb.2021.131198 ◽

2022 ◽

Vol 354 ◽

pp. 131198

Author(s):

Zeriş Aksu ◽

Cengiz Han Şahin ◽

Murat Alanyalıoğlu

Keyword(s):

Electrochemical Reduction ◽

One Step

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Tobacco stalk-derived carbon prepared by one-step molten salt carbonization for supercapacitor

Functional Materials Letters ◽

10.1142/s1793604721510218 ◽

2021 ◽

pp. 2151021

Author(s):

Yuxuan Liu ◽

Xinhua Cheng ◽

Shenghui Zhang

Keyword(s):

Aqueous Solution ◽

Energy Density ◽

Porous Structure ◽

Molten Salt ◽

Electrode System ◽

Rate Performance ◽

Heteroatom Doping ◽

Hierarchically Porous Structure ◽

One Step ◽

Tobacco Stalk

High-performance capacitive carbon materials, derived from tobacco stalk, were prepared by a one-step carbonization process in molten carbonate. Owing to the high specific surface area (SSA) (1165.9 m2 g[Formula: see text] and heteroatom doping by the activation effect of molten salt medium for 3 h, the as-obtained carbon material with hierarchically porous structure exhibits an ideal capacitive property with delivering specific capacitances of 219.8, 188.0, 176.4, and 168.4 F g[Formula: see text] at 0.2, 0.5, 1, and 2 A g[Formula: see text], respectively, acceptable rate performance with 76.6% capacitance retention in range of 0.2–2 A g[Formula: see text], and good cyclic stability with 93% capacitance retention after 3000 charge–discharge cycles at 1 A g[Formula: see text], as well as energy density of 30.5 Wh kg[Formula: see text] at 0.2 A g[Formula: see text] and power density of 989.6 W kg[Formula: see text] at 2 A g[Formula: see text] in 1 mol L[Formula: see text] H2SO4 aqueous solution using a three-electrode system. Moreover, it delivers specific capacitances of 143.3, 140.2, 137.4, and 134.3 F g[Formula: see text] at 0.2, 0.5, 1, and 2 A g[Formula: see text], respectively, and excellent rate performance with 93.7% capacitance retention in range of 0.2–2 A g[Formula: see text], as well as energy density of 4.9 Wh kg[Formula: see text] at 0.2 A g[Formula: see text] and power density of 488.6 W kg[Formula: see text] at 2 A g[Formula: see text] in 6 mol L[Formula: see text] KOH aqueous solution using a symmetrical two-electrode system. The correlation between hierarchically porous structure with heteroatom doping and capacitive performance is also discussed.

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Production of novel carbon nanostructures by electrochemical reduction of polychlorinated organic rings under mild conditions for supercapacitors

New Journal of Chemistry ◽

10.1039/d1nj01542g ◽

2021 ◽

Author(s):

Züleyha Kudaş ◽

Emir Çepni ◽

Emre Gür ◽

Duygu Ekinci

Keyword(s):

Carbon Source ◽

Electrochemical Reduction ◽

Electrochemical Method ◽

Carbon Nanostructures ◽

Electrochemical Growth ◽

Mild Conditions ◽

One Step ◽

The One ◽

Carbon Based

Here, new carbon-based nanostructures were prepared by the one-step electrochemical method using hexagonal and pentagonal polychlorinated organic rings as carbon source. The electrochemical growth of carbon nanostructures on substrates was...

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