2021
DOI: 10.1021/acsaem.1c01306
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Artificial N-doped Graphene Protective Layer Enables Stable Zn Anode for Aqueous Zn-ion Batteries

Abstract: Zinc (Zn) metal anode is one of the promising aqueous anodes due to its lower reduction potential and high capacity; however, the unstable interface during cycling severely inhibits the development of aqueous Zn-ion batteries (ZIBs). Here, we constructed a protective layer of nitrogen (N)-doped graphene (NGO) on Zn foil using a simple squeegee coating process. In situ optical microscopy and mass spectrometry analyses further demonstrated that this graphene protective layer alleviates the release of hydrogen as… Show more

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Cited by 64 publications
(38 citation statements)
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“…The reactions often caused the formation of irreversible by‐products (such as Zn 4 SO 4 (OH) 6 ·5H 2 O), and the corresponding XRD patterns are shown in Figure 4c. [ 30 ] The well anticorrosion of ROZ@Zn foils significantly avoiding the hydrogen evolution was mainly benefited from the desolvation and barrier water effect of ROZ coating, as the result of the compact surface of the ROZ coating. As shown in Figure S11, Supporting Information, the SEM images and elemental mapping images of ROZ@Zn were characterized only in 1 µm.…”
Section: Resultsmentioning
confidence: 99%
“…The reactions often caused the formation of irreversible by‐products (such as Zn 4 SO 4 (OH) 6 ·5H 2 O), and the corresponding XRD patterns are shown in Figure 4c. [ 30 ] The well anticorrosion of ROZ@Zn foils significantly avoiding the hydrogen evolution was mainly benefited from the desolvation and barrier water effect of ROZ coating, as the result of the compact surface of the ROZ coating. As shown in Figure S11, Supporting Information, the SEM images and elemental mapping images of ROZ@Zn were characterized only in 1 µm.…”
Section: Resultsmentioning
confidence: 99%
“…Rechargeable zinc batteries (RZBs) employing mild aqueous electrolytes hold promise for large-scale energy storage applications owing to the advantages of the metallic Zn anode, including intrinsic safety, globally abundant reserves, and high gravimetric and volumetric capacity (820 mAh g –1 and 5855 mAh cm –3 ). Moreover, the mildly acidic aqueous electrolytes (e.g., ZnSO 4 solution) with high ionic conductivity can promote the rechargeability of traditional oxide cathode materials (e.g., MnO 2 and V 2 O 5 ), which generally suffer from severe capacity fade in strongly acidic or alkaline electrolytes. , However, state-of-the-art RZBs are hindered by the irreversibility of Zn anodes associated with side reactions and metallic dendrite formation. , Since the redox potential of Zn 2+ /Zn is −0.76 V versus the standard hydrogen electrode (SHE), water decomposition along with the hydrogen evolution reaction (HER) inevitably occurs on Zn during battery rest and operation, leading to the severe corrosion of Zn anodes . Moreover, the HER elevates the local pH value and provokes the formation of inactive byproducts (e.g., Zn­(OH) 2 and Zn 4 SO 4 (OH) 6 · x H 2 O), resulting in a low Coulombic efficiency (CE) and a degradation of battery performance. In addition, the nonuniform Zn 2+ flux originating from heterogeneous nucleation sites and concentration polarization results in rampant dendritic Zn deposition, which accelerates parasitic reactions and shortens the battery lifespan. , …”
Section: Introductionmentioning
confidence: 99%
“…It is worth mentioning that the DOD values of 4.1–41.3% in our Zn anode are much higher than those in most reported papers in full cells (Table S4). , Due to the use of the high-DOD Zn anode, the energy and power density at the cell level could be enhanced, and the highest energy densities achieved with MnO 2 -, AC-, and I 2 /AC-based full cells are 195.3, 52.58, and 30.73 Wh kg –1 , respectively (Figure S24).…”
mentioning
confidence: 99%