Examining the effects of nitrogen-doped carbon coating on zinc vanadate nanoflowers towards high performance lithium anode

Cao, Huili; Zheng, Zhiyong; Meng, Jie; Xiao, Xinxin; Norby, Poul; Mossin, Susanne

doi:10.1016/j.electacta.2020.136791

Cited by 9 publications

(12 citation statements)

References 79 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A voltage drop during the first discharge at 1.5 V indicates the decomposition of Zn 3 V 2 O 8 into ZnO and the formation of Li x V 2 O 5 , while the plateau at 0.8 V corresponds to the reduction of ZnO to metallic Zn and the plateau at 0.3 and 0.1 V are assigned to the formation of Li-Zn alloy, Li 2 O and irreversible SEI layer. 55,58 The slopping curve during the first charge resembles the oxidation peaks in the CV curve (Figure 6A).…”

Section: Resultsmentioning

confidence: 59%

Lithium‐ion battery anode with high capacity retention derived from zinc vanadate and holey graphene

Khan

Ali

Inayat

et al. 2022

Intl J of Energy Research

View full text Add to dashboard Cite

Several phases of zinc vanadates having different morphologies have been investigated recently for lithium-ion batteries (LIBs), where they suffer from poor electronic conductivity and low mechanical stability resulting in short cycle life, low specific capacity and unsatisfactory rate performance. The issues are resolved here, by directly growing Zn 3 V 2 O 8 sheets on two dimensional (2D) holey graphene oxide (hGO) nanosheets making an open framework of Zn 3 V 2 O 8 that allows suitable spacing for Li + -ions for (de) intercalation and the holey graphene provides the necessary mechanical strength, permeability and electronic conductivity across the Zn 3 V 2 O 8 sheets. Consequently, the sheet on sheet morphology has resulted in an impressive rate capability of 851.2 mAh g À1 at 5000 mA g À1 with 67% retention after a 10-fold increase in the current rate, high specific capacity (1465.9 mAh g À1 at 200 mA g À1 ) and long-term stability (88% retention after 200 cycles). This is due to the crystalline structure of Zn 3 V 2 O 8 /hGO, with a large surface area that can provide more reaction sites and facilitate the fast Li + -ion transport as verified by the electrochemical impedance spectroscopy analysis. The ex situ X-ray photoelectron spectrometer reveals the involvement of multiple reaction mechanisms (conversion, (de) insertion and (de) alloying) showing Zn 2+ /Zn 0 and V 4+ /V 3+ /V 2+ redox couples during the electrochemical process.

show abstract

Section: Resultsmentioning

confidence: 59%

Lithium‐ion battery anode with high capacity retention derived from zinc vanadate and holey graphene

Khan

Ali

Inayat

et al. 2022

Intl J of Energy Research

View full text Add to dashboard Cite

show abstract

“…The gradual mass loss of 6.4% of M11-130 from 25 to 142 °C was due to moisture loss. [32] The further mass loss from 140 to 700 °C arose from the decomposition of starch and CuS confirmed by the reference TGA traces of M11-130-0 (CuS NCs without starch coating) and pure starch (Figure S8, Supporting Information). The mass percentage of starch in M11-130 was estimated to be 64%.…”

Section: Structural and Spectral Characterization Of Cus Ncsmentioning

confidence: 74%

Starch Capped Atomically Thin CuS Nanocrystals for Efficient Photothermal Therapy

Zheng

Cao

et al. 2021

Small

Self Cite

View full text Add to dashboard Cite

hampered to date by the limited success in the development of clinical photothermal therapy agents. [6] PTT exploits heat generated locally by a photosensitizer, [7] in which both the photothermal agents and laser sources, as well as the matching between them, are essential. Laser thermal therapy generally employs continuouswave lasers with wavelengths of either 808 or 980 nm. [8,9] The wavelengths are in the near-IR (NIR, λ = 700-1100 nm) window so that photons can penetrate deep into biological tissue. [10][11][12] Certain nanoparticles (NPs) have proper carrier densities enabling them to exhibit localized surface plasmon resonances (LSPRs) that efficiently facilitate the conversion of NIR light into heat. [10][11][12] Several types of NPs are currently being developed as photosensitizers, including metallic and semiconductor NPs. Noble metal NPs, for example, Ag and Au NPs, have been extensively applied for the LSPRs in the visible spectrum. [5,[13][14][15] Semi conductor NPs have tunable carrier concentration and LSPRs typically in the NIR range. [10,11] A high photothermal conversion efficiency is key to effective NP photosensitizers to avoid thermal damage to healthy tissue, which is a serious problem in PTT. The NPs with a high photothermal conversion efficiency and tumor selectivity can thus effectively destroy the cancer cells at a low photon density and in a short treatment time, while keeping the surrounding healthy tissue at a safe temperature. [16] Other key factors to consider for developing Photothermal therapy requires efficient plasmonic nanomaterials with small size, good water dispersibility, and biocompatibility. This work reports a one-pot, 2-min synthesis strategy for ultrathin CuS nanocrystals (NCs) with precisely tunable size and localized surface plasmon resonance (LSPR), where a single-starch-layer coating leads to a high LSPR absorption at the near-IR wavelength 980 nm. The CuS NC diameter increases from 4.7 (1 nm height along [101]) to 28.6 nm (4.9 nm height along [001]) accompanied by LSPR redshift from 978 to 1200 nm, as the precursor ratio decreases from 1 to 0.125. Photothermal temperature increases by 38.6 °C in 50 mg L −1 CuS NC solution under laser illumination (980 nm, 1.44 W cm −2 ). Notably, 98.4% of human prostate cancer PC-3/Luc+ cells are killed by as little as 5 mg L −1 starch-coated CuS NCs with 3-min laser treatment, whereas CuS NCs without starch cause insignificant cell death. LSPR modeling discloses that the starch layer enhances the photothermal effect by significantly increasing the free carrier density and blue-shifting the LSPR toward 980 nm. This study not only presents a new type of photothermally highly efficient ultrathin CuS NCs, but also offers in-depth LSPR modeling investigations useful for other photothermal nanomaterial designs.

show abstract

“…where d is the interplanar distance (nm) and D the diameter of the ring (or the distance between two symmetric spots) (1/nm). For a given elemental composition, a specific interplanar distance can be assigned to a corresponding crystal plane [42,43] . The lattice distances of 0.27, 0.22, 0.19, 0.15 nm obtained are assigned to PdO(002), Pd(111), Pd(200), and Cu 2 O(220) respectively [30,44–46] .…”

Section: Resultsmentioning

confidence: 99%

“…For a given elemental composition, a specific interplanar distance can be assigned to a corresponding crystal plane. [42,43] The lattice distances of 0.27, 0.22, 0.19, 0.15 nm obtained are assigned to PdO(002), Pd(111), Pd(200), and Cu 2 O(220) respectively. [30,[44][45][46] A similar pattern of Cu 2 O(220) in Figure 2F was reported in the Cu 2 O NPs obtained by MR-1 cultured with Cu(II) as the sole electron acceptor.…”

Section: Effect Of Cu(ii) On the Biosynthesis Of Pdnps And Characterimentioning

confidence: 98%

Effect of Copper and Phosphate on the Biosynthesis of Palladium Nanoparticles by Shewanella oneidensis MR‐1

et al. 2020

Self Cite

View full text Add to dashboard Cite

The biosynthesis of metallic nanomaterials, especially noble metal nanomaterials, has attracted extensive attention due to the multifarious potential applications of these materials. In this study we have explored the effects of Cu(II) on Pd(II) removal, and of Cu(II) as well as phosphate on the morphologies and composition of biogenic nanoparticles (NPs) from aqueous Pd (II) systems by Shewanella oneidensis MR-1 (MR-1). Cu(II) causes a slight efficiency decrease of Pd(II) removal by MR-1, but a high removal efficiency of 89.8 % is still achieved, which contrasts sharply with the significant Cu(II) inhibition to other microbes. Without phosphate buffer in the medium, 5-nm PdNPs densely envelop MR-1 and accumulate significantly in the periplasm in the absence of Cu(II), while 4-nm PdNPs are evenly distributed in the periplasm, and the cellular surface is smooth in the presence of Cu(II). The following effect of Cu(II) on PdNP synthesis by MR-1 is therefore proposed: Cu(II) significantly affects PdNPs morphologies by inhibiting Pd(0) transfer across the outer membrane and PdNP crystal growth in the periplasm, but not the sorption of Pd(II). Phosphate addition only slightly increases Pd harvest but also precipitates Cu(II) and poses difficulties for the biosynthesis. The study highlights the effect of co-existing metals during the biosynthesis of metallic nanomaterials and offers new insight into the mechanism of PdNP formation and the electron transfer during Pd(II) reduction by MR-1.

show abstract

Examining the effects of nitrogen-doped carbon coating on zinc vanadate nanoflowers towards high performance lithium anode

Cited by 9 publications

References 79 publications

Lithium‐ion battery anode with high capacity retention derived from zinc vanadate and holey graphene

Lithium‐ion battery anode with high capacity retention derived from zinc vanadate and holey graphene

Starch Capped Atomically Thin CuS Nanocrystals for Efficient Photothermal Therapy

Effect of Copper and Phosphate on the Biosynthesis of Palladium Nanoparticles by Shewanella oneidensis MR‐1

Contact Info

Product

Resources

About