Pseudocapacitive Li+ intercalation in ZnO/ZnO@C composites enables high-rate lithium-ion storage and stable cyclability

Li, Qin; Zhang, Han; Lou, Shuaifeng; Qu, Yanbin; Zuo, Pengjian; Ma, Yulin; Cheng, Xinqun; Yin, Geping

doi:10.1016/j.ceramint.2017.06.051

Cited by 30 publications

(8 citation statements)

References 61 publications

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“…Herein, parameter b corresponds to the slope in the linear equation above (Equation (4)) and has a value between 0.5 and 1. The typical battery-type anode materials, which are highly influenced by the diffusion-controlled process, have a b value close to 0.5, and the b value of the pseudocapacitive electrode is close to 1 [ 51 , 52 , 53 , 54 ]. Figure 9 c shows the CV curves of Ge/GeO 2 /MRGO at different scan rates (0.1, 0.3, 0.5, and 0.8 mV/s), and the dependence of the b value, which was obtained from the cathodic and anodic sweeps, are shown in Figure S4 (Supplementary Materials) .…”

Section: Resultsmentioning

confidence: 99%

Microwave-Assisted Synthesis of Ge/GeO2-Reduced Graphene Oxide Nanocomposite with Enhanced Discharge Capacity for Lithium-Ion Batteries

Koo

Paek

2021

Nanomaterials

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Germanium/germanium oxide nanoparticles with theoretically high discharge capacities of 1624 and 2152 mAh/g have attracted significant research interest for their potential application as anode materials in Li-ion batteries. However, these materials exhibit poor long-term performance due to the large volume change of 370% during charge/discharge cycles. In the present study, to overcome this shortcoming, a Ge/GeO2/graphene composite material was synthesized. Ge/GeO2 nanoparticles were trapped between matrices of graphene nanosheets to offset the volume expansion effect. Transmission electron microscopy images revealed that the Ge/GeO2 nanoparticles were distributed on the graphene nanosheets. Discharge/charge experiments were performed to evaluate the Li storage properties of the samples. The discharge capacity of the bare Ge/GeO2 nanoparticles in the first discharge cycle was considerably large; however, the value decreased rapidly with successive cycles. Conversely, the present Ge/GeO2/graphene composite exhibited superior cycling stability.

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Section: Resultsmentioning

confidence: 99%

Microwave-Assisted Synthesis of Ge/GeO2-Reduced Graphene Oxide Nanocomposite with Enhanced Discharge Capacity for Lithium-Ion Batteries

Koo

Paek

2021

Nanomaterials

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“…324,325 Next, the effect of methanol solvent (which helped dissolve BPA) was studied by testing a mixture of methanol and KCl. Figure 5.4d confirms that methanol did not produce other current peaks than the reduction peak at -0.7 V. Addition of BPA produces an irreversible oxidation peak at +0.3 V that is also observed slightly with phenol as shown in The mechanism of current magnification was thus confirmed (rather than just a simple phenol preconcentration effect), to require complete drying in order to form a conductive coating of ZnO nanoparticles on the SPE, where similar reduction peak magnification with ZnO was observed by Li et al (2017). 326 The effect of KCl electrolyte in revealing the redox activity of phenol is demonstrated in…”

Section: Characterization By Electrochemical Impedance Spectroscopy (...supporting

confidence: 53%

Selective Detection and Removal of Zinc Oxide Nanoparticles in Contaminated Water

Zhang¹

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Metal oxide nanoparticles (MONPs) are massively produced for various industrial, environmental and biomedical applications due to their high surface reactivity and unique chemical and physical properties. Among all the manufactured MONPs, human exposure to zinc oxide (ZnO) nanoparticles may cause significant health concerns. This leads to a desire for efficient methods for their facile detection in the aqueous environment. In this work, two detection methods and one removal method were developed to selectively detect or remove ZnO nanoparticles in contaminated water with the presence of other MONPs.A detection method based on the fluorescence quenching of meso-tetra(4carboxyphenyl) porphyrin (TCPP) has been developed to treat water samples containing MONPs. Quenching of the TCPP emission intensity at 650 nm provides a Stern-Volmer plot with adequate sensitivity for the detection of 0.15 mg/mL ZnO nanoparticles.Meanwhile, a unique emission peak at 605 nm is observed and can be used for the identification and quantitation of ZnO nanoparticles down to 0.0015 mg/mL. A removal method using 3-aminopropyltriethoxysilane (APTES) has been proved to sediment ZnO nanoparticles in aqueous suspension with TCPP as a color indicator for ZnO. When 2.0% (v) APTES is applied to treat water samples containing ≥ 0.5 mg/mL of ZnO nanoparticles, a web-like sediment adheres onto the glass vial bottom from APTES-ZnO conjugation. A high removal efficiency of over 99% (w) ZnO nanoparticles was attained using APTES.Another detection method has been developed using electroanalytical analysis by firstly drop-casting MONPs on a screen-printed electrode. When phenol is analyzed as a iii chemical probe by cyclic voltammetry (CV), measurement of the reduction current provides adequate sensitivity for the indirect quantitation of 0.1 mg/mL ZnO nanoparticles.Both the oxidation peak and charge storage capacity measured from the cyclic voltammogram are proportional to the ZnO nanoparticle concentration and can afford a better detection limit of 0.01 mg/mL. Overall, the above methods are labour and cost effective and can afford high selectivity towards ZnO detection or removal in the presence of other MONPs.Additionally, the electrochemical analysis method and the APTES sedimentation method can differentiate ZnO nanoparticles from Zn 2+ and zinc peroxide (ZnO2) nanoparticles.iv PrefaceThis preface provides full bibliographical details for each article included in this thesis, as well as whether the article is reproduced in whole or in part. Permission was obtained from the publishers to include the articles in the thesis. When citing material from this thesis, please cite the article relevant to the chapter, if the chapter is based on a publication.Pursuant to the Integrated Thesis policy of Carleton University, the "supervisor" (Edward P.C. Lai) and the "student" (Wenyu Zhang) confirm that the student was fully involved in setting up and conducting the research, obtaining data and analyzing results, as well as preparing and writing the material pres...

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“…Moreover, the diminished intensity of PNR diffraction peak in ZnO/PNR nanocomposites can be attributed to the existence of ZnO nanoparticles and partial concealing of PNR by ZnO nanoparticles. The diffraction intensity of ZnO in ZnO/PNR composite showed weak and broad XRD peaks, which may be connected with homogeneous distribution and small particle size of ZnO [28]. No peaks corresponding to any impurity were found, implying the high purity of the product.…”

Section: Resultsmentioning

confidence: 92%

Synthesis of ZnO/Polypyrrole Nanoring Composite as High-Performance Anode Materials for Lithium Ion Batteries

Yang

Zhao

et al. 2019

Journal of Nanomaterials

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ZnO has attracted considerable attention as electrode material in lithium-ion battery (LIB) due to its theoretically high capacity. However, poor electronic conductivity and huge volumetric changes during cycling limit its industrial applications. In this work, polypyrrole nanorings (PNRs) were successfully prepared via the solution chemistry method using pyrrole (Py) as raw material, ammonium persulfate (APS) as oxidant, and cetyltrimethyl ammonium bromide (CTAB) as surfactant. The ZnO/PNR composite was synthesized with zinc oxide nanoparticles absorbed on the surface of PPy nanorings through the one-pot in situ sol-gel method. The composite shows a three-dimensional intertwined network structure where the size of polypyrrole nanorings ranges from 80 nm to 100 nm in diameter and the average size of uniformly distributed ZnO nanocrystals is 10.49 nm. The unique three-dimensional conductive framework can provide good electronic contact between the ZnO particles and buffer the volume variation during the lithiation/delithiation processes. As an electrode material for LIBs, the ZnO/PNR composite delivers a first cycle discharge capacity of 1658 mAh g-1 and a capacity retention of 50.7% over 150 cycles at 200 mA g-1, indicating high specific capacity and outstanding cycle stability.

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Pseudocapacitive Li+ intercalation in ZnO/ZnO@C composites enables high-rate lithium-ion storage and stable cyclability

Cited by 30 publications

References 61 publications

Microwave-Assisted Synthesis of Ge/GeO2-Reduced Graphene Oxide Nanocomposite with Enhanced Discharge Capacity for Lithium-Ion Batteries

Microwave-Assisted Synthesis of Ge/GeO2-Reduced Graphene Oxide Nanocomposite with Enhanced Discharge Capacity for Lithium-Ion Batteries

Selective Detection and Removal of Zinc Oxide Nanoparticles in Contaminated Water

Synthesis of ZnO/Polypyrrole Nanoring Composite as High-Performance Anode Materials for Lithium Ion Batteries

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