Manipulating Zn-ion flux by two-dimensional porous g-C3N4 nanosheets for dendrite-free zinc metal anode

Yang, Yi; Chen, Tao; Yu, Bingxue; Zhu, Mingke; Meng, Fanbo; Shen, Weixiang; Zhang, Mingchang; Qi, Zichen; Zeng, Kaiyang; Xue, Junmin

doi:10.1016/j.cej.2021.134077

Cited by 42 publications

(27 citation statements)

References 45 publications

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“…The pore size and structure of a separator determine the physical pathway of Zn ions, thereby directly affecting the Zn-ion flux . By coating a layer of two-dimensional porous g-C 3 N 4 nanosheets onto commercial separators, the Zn-ion flux could be redistributed and homogenized after passing through the small and uniform pores of the coating layer. , Beyond the physical features of the separator, zincophilic functional groups present on the surface of the separator could adsorb Zn ions to guide the Zn plating/stripping. The decoration of the separator with zincophilic functional groups such as oxygen-containing graphene (oxide) , and big molecules with abundant polar functional groups , has generally shown motivating results.…”

Section: Introductionmentioning

confidence: 99%

Regulating Dendrite-Free Zn Deposition by a Self-Assembled OH-Terminated SiO₂ Nanosphere Layer toward a Zn Metal Anode

Yang

Chen

Zhu

et al. 2022

ACS Appl. Mater. Interfaces

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Zn dendrite growth during repeated plating and stripping of a Zn metal anode often causes short-circuiting by puncturing the separator. Herein, we propose a separator modification strategy to regulate the Zn-ion flux and achieve uniform Zn deposition through the OH-terminated SiO 2 nanosphere coating. The interspaces between the uniform SiO 2 nanospheres construct a network of Zn-ion transport channels, and the negatively charged hydroxyl groups on the surface of SiO 2 nanospheres can electrostatically attract the Zn ions to direct the ion migration. The negative charges on SiO 2 nanospheres are retained at a higher pH, which enables the SiO 2 coating to consistently regulate the Zn-ion flux in the operating pH range of the Zn stripping/plating process. With a uniform Zn deposition guided by the SiO 2 coating, the dendrite formation is suppressed and the side reactions are alleviated. As a result, the Zn||Zn symmetric cell achieves a cyclic life of 1000 h at both 3 and 5 mA cm −2 . Meanwhile, the Zn||Cu asymmetric cell is able to maintain a Coulombic efficiency of 99.62% at 1 mA cm −2 for 2000 cycles, which outperforms many previously reported strategies.

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Section: Introductionmentioning

confidence: 99%

Regulating Dendrite-Free Zn Deposition by a Self-Assembled OH-Terminated SiO₂ Nanosphere Layer toward a Zn Metal Anode

Yang

Chen

Zhu

et al. 2022

ACS Appl. Mater. Interfaces

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“…Moreover, better lifespan retention (over 700 h) is achieved at 2 mA cm –2 in the symmetric cell with the CT separator (Figure S5a), whereas the cell with GF breaks down after 170 h. A commercial level with the areal capacity of 4 mAh cm –2 is also evaluated in the symmetric cell at 2 mA cm –2 , as shown in Figure i; the cell matched with the CT separator displays outstanding cyclic stability over 700 h. Even raising the current density to 5 or 10 mA cm –2 , it harvests superiority compared with the GF separator (Figure S5b and c). The symmetric cell with the CT separator presents favorable cycling over 600 cycles (over 140 h) at 20 mA cm –2 (Figure g), which exceeds most of the reported works for the symmetric cell (Figure k). ,,,− The reason for the voltage fluctuations may be attributed to the instability of ion fluxes at a higher current density and lower areal capacity in the precycle stage. In addition, because of the more severe issues associated with Zn powder as the anode compared to Zn foil, such as side reactions and hydrogen evolution due to more contact with the electrolyte, collapse of the structure during cycling, and rapid failure of the cell due to severe dendrite, the CT separator has a stabilizing effect on the Zn powder anode (Zn-P) which is further verified in the symmetric cell using the CT separator (Figure S6).…”

Section: Resultsmentioning

confidence: 68%

Stabilizing Zinc Anodes by a Cotton Towel Separator for Aqueous Zinc-Ion Batteries

Cao

Zhou

et al. 2022

ACS Sustainable Chem. Eng.

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The poor electrochemical stabilities of aqueous zinc-ion batteries (AZIBs) are mainly related to the uncontrollable dendrite growth, hydrogen evolution, and side reactions. Here, a commercial cotton towel (CT) is directly developed as a separator of AZIBs to mitigate these problems. This CT separator effectively buffers the hydrogen evolution and side reactions to enhance the reversibility of a Zn anode. Additionally, the strong coordination between the hydroxyl group in the CT separator and Zn2+ significantly constrains two-dimensional surface diffusion of Zn atom and increases nucleation sites, further regulating uniform Zn deposition, which effectively cushions Zn dendrite formation. Accordingly, the symmetric cell equipped with the CT separator displays an ultralong lifespan of over 1200 h at 1 mA cm–2 for 0.5 mAh cm–2 and 700 h at 2 mA cm–2 for 4 mAh cm–2. Notably, the CT separator significantly boosts the cyclability of a MnO2 full cell at 1 A g–1 (96.9 mAh g–1 after 2400 cycles). A flexible soft-packaged cell consisting of CT enables an impressive electrochemical performance. Such a high-performance separator with attractive cost effectiveness provides a potential prospect for large-scale applications of AZIBs in electrochemical energy storage devices and wearable electronics.

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“…Another feasible carbon compound for Zn anodes is graphitic carbon nitride (g-C 3 N 4 ). The g-C 3 N 4 is a planar 2D sheet structure similar to graphene, which has two basic units, respectively, using the triazine ring (C 3 N 3 ) and 3-s-triazine ring (C 6 N 7 ) to extend infinitely to form a network structure, and the 2D nanosheets are combined by van der Waals force [105][106][107][108]. The rich N element successfully improves the zincophilicity of g-C 3 N 4 , which attracted attention to Zn anode protection.…”

Section: Other Carbon-based 2d Materials For Advanced Zn Anodesmentioning

confidence: 99%

“…For example, Xue et al (Fig. 5c) coated g-C 3 N 4 nanosheets onto a commercial cellulose fiber separator via a simple drop-casting route [107]. The porous 2D g-C 3 N 4 nanosheets act as ion redistributors to induce homogenous Zn ion flux; thus, the g-C 3 N 4 coated separator enables a dendrite-free Zn deposition and improves the reversibility of Zn metal anodes.…”

Section: As Separator Modificationsmentioning

confidence: 99%

2D Materials Boost Advanced Zn Anodes: Principles, Advances, and Challenges

et al. 2023

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Aqueous zinc-ion battery (ZIB) featuring with high safety, low cost, environmentally friendly, and high energy density is one of the most promising systems for large-scale energy storage application. Despite extensive research progress made in developing high-performance cathodes, the Zn anode issues, such as Zn dendrites, corrosion, and hydrogen evolution, have been observed to shorten ZIB’s lifespan seriously, thus restricting their practical application. Engineering advanced Zn anodes based on two-dimensional (2D) materials are widely investigated to address these issues. With atomic thickness, 2D materials possess ultrahigh specific surface area, much exposed active sites, superior mechanical strength and flexibility, and unique electrical properties, which confirm to be a promising alternative anode material for ZIBs. This review aims to boost rational design strategies of 2D materials for practical application of ZIB by combining the fundamental principle and research progress. Firstly, the fundamental principles of 2D materials against the drawbacks of Zn anode are introduced. Then, the designed strategies of several typical 2D materials for stable Zn anodes are comprehensively summarized. Finally, perspectives on the future development of advanced Zn anodes by taking advantage of these unique properties of 2D materials are proposed.

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Manipulating Zn-ion flux by two-dimensional porous g-C3N4 nanosheets for dendrite-free zinc metal anode

Cited by 42 publications

References 45 publications

Regulating Dendrite-Free Zn Deposition by a Self-Assembled OH-Terminated SiO₂ Nanosphere Layer toward a Zn Metal Anode

Regulating Dendrite-Free Zn Deposition by a Self-Assembled OH-Terminated SiO₂ Nanosphere Layer toward a Zn Metal Anode

Stabilizing Zinc Anodes by a Cotton Towel Separator for Aqueous Zinc-Ion Batteries

2D Materials Boost Advanced Zn Anodes: Principles, Advances, and Challenges

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Manipulating Zn-ion flux by two-dimensional porous g-C3N4 nanosheets for dendrite-free zinc metal anode

Cited by 42 publications

References 45 publications

Regulating Dendrite-Free Zn Deposition by a Self-Assembled OH-Terminated SiO2 Nanosphere Layer toward a Zn Metal Anode

Regulating Dendrite-Free Zn Deposition by a Self-Assembled OH-Terminated SiO2 Nanosphere Layer toward a Zn Metal Anode

Stabilizing Zinc Anodes by a Cotton Towel Separator for Aqueous Zinc-Ion Batteries

2D Materials Boost Advanced Zn Anodes: Principles, Advances, and Challenges

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Product

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Regulating Dendrite-Free Zn Deposition by a Self-Assembled OH-Terminated SiO₂ Nanosphere Layer toward a Zn Metal Anode

Regulating Dendrite-Free Zn Deposition by a Self-Assembled OH-Terminated SiO₂ Nanosphere Layer toward a Zn Metal Anode