β-Ni(OH)2 nanosheets coating on 3D flower-like α-Ni(OH)2 as high-performance electrodes for asymmetric supercapacitor and Ni/MH battery

Liang, Weijun; Wang, Senlin; Zhang, Yanxiu; Gu, Jian; Zhu, Kai-da; Zhong, Jing; Wang, Xinru

doi:10.1016/j.jallcom.2020.156616

Cited by 38 publications

(18 citation statements)

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“…The broad peak in the 34°−37°range reflects the turbostratic disorder of α-Ni(OH) 2 , 11 which is related to many defects that exist in the crystal. 10,20 There are no characteristic peaks of Aland Y-based species in all samples, suggesting that Al ions and Y ions have been successfully incorporated into the space lattice of Ni hydroxide. Physical properties and parameters from the XRD data analysis are given in Table 2.…”

Section: ■ Results and Discussionmentioning

confidence: 91%

“…Compared to the α-Ni(OH) 2 ·0.75H 2 O, the diffraction peaks shift to a lower angle, suggesting that the Al and Y have been successfully doped in the Ni lattice and broaden the (003) crystal plane spacing. The broad peak in the 34°–37° range reflects the turbostratic disorder of α-Ni(OH) 2 , which is related to many defects that exist in the crystal. , There are no characteristic peaks of Al- and Y-based species in all samples, suggesting that Al ions and Y ions have been successfully incorporated into the space lattice of Ni hydroxide. Physical properties and parameters from the XRD data analysis are given in Table .…”

Section: Resultsmentioning

confidence: 96%

“…Differing from a single-electron exchange reaction of the β-phase in a redox process, the α-phase can achieve a two-electron exchange reaction, so it has a larger capacity (480 mAh g –1 ) than that of β-Ni(OH) 2 . Because of its turbostratic structure, , α-phase nickel hydroxide is considerably unstable in a strong alkali solution and easily converts to the β-phase. To enhance the stability of the α-phase in strong alkali solutions, many researchers concentrate on preparing a stabilized α-phase by doping some metal ions in a Ni(OH) 2 lattice, such as Al, − , Mn, , Cu, Co, ,− Zn, , and so on.…”

Section: Introductionmentioning

confidence: 99%

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Structure and Electrochemical Performance of Al and Y Co-Doped α-Nickel Hydroxide as a Cathode for a Ni-MH Battery

et al. 2021

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The Al and Y elements co-doped α-Ni(OH)2 materials were prepared by a chemical complexing precipitation method. The physical properties and structures of these materials were characterized, and their electrochemical performance as a cathode for Ni-MH batteries was measured. The results show that Al and Y elements partially replaced Ni atoms in the layers and attracted more anions between interlayers, thereby neutralizing the positive charge and stabilizing the structure. Therefore, the Al and Y elements co-doped α-Ni(OH)2 cathode displays excellent reaction reversibility, low electrochemical resistance, and fast diffusion rate. Besides, the cycling stability indicates that the discharge capacity and the activation rate are improved by adding Y element. The sample containing 2 atom % Y has the highest capacity of 388 mAh g–1 at 1 C rate, and it has great rate performance and great cycle stability. This is a promising material as a cathode applied in Ni-MH batteries.

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Section: ■ Results and Discussionmentioning

confidence: 91%

Section: Resultsmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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Structure and Electrochemical Performance of Al and Y Co-Doped α-Nickel Hydroxide as a Cathode for a Ni-MH Battery

et al. 2021

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“…However, due to its turbostratic structure [17][18][19], α-Ni(OH) 2 is quite unstable in strong alkaline solutions and easily transforms into β-Ni(OH) 2 , thus leading to the capacity attenuation during charge/discharge cycles. To overcome the instability, many works [17,[20][21][22][23][24][25][26][27] have been attempted to stabilize the structure of α-Ni(OH) 2 in alkaline solutions by doping other metal ions to substitute Ni atom in nickel hydroxide lattice.…”

Section: Introductionmentioning

confidence: 99%

“…In addition to element doping, surface modification [19,[28][29][30][31] on nickel hydroxide is another effective method to improve nickel hydroxide performances. The Liang's group [19] synthesized β-Ni(OH) 2 nanosheet coating on 3D flower-like α-Ni(OH) 2 by a two-step hydrothermal method. There were multiple synergistic effects between the outer β-Ni(OH) 2 and the inner α-Ni(OH) 2 .…”

Section: Introductionmentioning

confidence: 99%

Manganese coating α-Ni(OH)2 as high-performance cathode material for Ni-MH battery

Niu

Liang

Shen

et al. 2021

Ionics

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The α-Ni(OH) 2 coated with manganese (Mn) materials was synthesized by the chemical precipitation method, and the electrochemical properties were investigated. The results showed that the ingredient of the coating is a mixture of MnO 2 and Mn 2 O 3 , and the coating can inhibit the intercalated anions escape and stabilize the α-Ni(OH) 2 phase structure in KOH alkaline solution. The coated electrodes have higher discharge capacities and higher capacity retention rates than the uncoated α-Ni(OH) 2 electrode, the discharge capacity of Mn-coated electrodes is over 350 mAh g −1 , and the capacity retention rate exceeds 92%, separately. The reason may be that the Mn coatings can block or decelerate water molecule and the anion to escape from the interlayers, therefore prevent α phase structural collapse and maintain high discharge capacity during a long lifespan cycle. Therefore, the Mn coating α-Ni(OH) 2 is a promising candidate for high-power Ni-MH batteries.

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Scalable Alkaline Zinc‐Iron/Nickel Hybrid Flow Battery with Energy Density up to 200 Wh L⁻¹

Zhi

Zhang

et al. 2022

Advanced Materials

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Achieving net‐zero emissions requires low‐cost and reliable energy storage devices that are essential to deploy renewables. Alkaline zinc‐based flow batteries such as alkaline zinc‐iron (or nickel) flow batteries are well suited for energy storage because of their high safety, high efficiency, and low cost. Nevertheless, their energy density is limited by the low solubility of ferro/ferricyanide and the limited areal capacity of sintered nickel electrodes. Here, combining the electrochemical reaction with the chemical reaction of ferro/ferricyanide couple in a homemade nickel electrode, an alkaline zinc‐iron/nickel hybrid flow battery with a high energy density of 208.9 Wh L−1 and an energy efficiency of 84.7% at a high current density of 80 mA cm−2 is reported. The reversible chemical reactions between dual couples are proven to stabilize the nickel electrode by promoting the activation of the nickel electrode and further preventing the formation of γ‐NiOOH. A kW‐scale stack is demonstrated by the integration of ferro/ferricyanide couple with nickel electrode, delivering a coulombic efficiency of 98% and an energy efficiency of 89% at 40 mA cm−2. This work demonstrates a promising pathway for constructing and upscaling flow batteries with high energy density and low cost.

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β-Ni(OH)2 nanosheets coating on 3D flower-like α-Ni(OH)2 as high-performance electrodes for asymmetric supercapacitor and Ni/MH battery

Cited by 38 publications

References 58 publications

Structure and Electrochemical Performance of Al and Y Co-Doped α-Nickel Hydroxide as a Cathode for a Ni-MH Battery

Structure and Electrochemical Performance of Al and Y Co-Doped α-Nickel Hydroxide as a Cathode for a Ni-MH Battery

Manganese coating α-Ni(OH)2 as high-performance cathode material for Ni-MH battery

Scalable Alkaline Zinc‐Iron/Nickel Hybrid Flow Battery with Energy Density up to 200 Wh L⁻¹

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β-Ni(OH)2 nanosheets coating on 3D flower-like α-Ni(OH)2 as high-performance electrodes for asymmetric supercapacitor and Ni/MH battery

Cited by 38 publications

References 58 publications

Structure and Electrochemical Performance of Al and Y Co-Doped α-Nickel Hydroxide as a Cathode for a Ni-MH Battery

Structure and Electrochemical Performance of Al and Y Co-Doped α-Nickel Hydroxide as a Cathode for a Ni-MH Battery

Manganese coating α-Ni(OH)2 as high-performance cathode material for Ni-MH battery

Scalable Alkaline Zinc‐Iron/Nickel Hybrid Flow Battery with Energy Density up to 200 Wh L−1

Contact Info

Product

Resources

About

Scalable Alkaline Zinc‐Iron/Nickel Hybrid Flow Battery with Energy Density up to 200 Wh L⁻¹