Hollow nanospheres composed of titanium dioxide nanocrystals modified with carbon and gold for high performance lithium ion batteries

Geng, Hongbo; Cao, Xueqin; Zhang, Yu; Geng, Kaiming; Qu, Genlong; Tang, Minghua; Zheng, Junwei; Yang, Yonggang; Gu, Hongwei

doi:10.1016/j.jpowsour.2015.06.093

Cited by 28 publications

(14 citation statements)

References 45 publications

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“…These results demonstrated the formation of the TiO 2 and metallic Au NP during the treatment. According to Scherrer's formula D = K ·λ/( B ·cosθ), the average particle sizes of Au NPs and TiO 2 were ≈4 and ≈7 nm, respectively, which was in good agreement with that of observed in TEM images …”

Section: Resultssupporting

confidence: 82%

Synergetic Photocatalytic Nanostructures Based on Au/TiO₂/Reduced Graphene Oxide for Efficient Degradation of Organic Pollutants

Zhao

Xü

Jiang

et al. 2016

Part. Part. Syst. Charact.

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Recently, there is crucial interest in the design and fabrication of nanocatalysts for efficient decomposition of organic pollutants in wastewater using visible light. This work reports the assembling fabrication of synergetic photocatalytic Au/TiO2/RGO nanostructures by utilizing the reduced graphene oxide (RGO) as substrate material and efficient separator for electrons and holes. The Au/TiO2 nanostructures with a ≈7 nm TiO2 particles size are dispersed uniformly on RGO nanosheets. UV–vis diffuse reflectance spectroscopy verifies that Au/TiO2/RGO nanocomposites show strong absorption of visible light. The degradation efficiency after 1 h for hydroquinone under visible light and UV light is ≈77% and ≈90%, respectively. Under visible light, the calculated apparent rates (k) of the Au/TiO2/RGO nanocomposites are 0.0112 and 0.0174 min−1 for decomposition of methylene blue and hydroquinone. That are five times greater than that of bare TiO2. The high photocatalytic activity is mainly attributed to the synergy between RGO and Au/TiO2 nanostructure. The strategy of composite nanostructures assembling on RGO is ensured to have a great practicable potential for the designing of high efficient multielement composite nanoparticles catalysts.

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Section: Resultssupporting

confidence: 82%

Synergetic Photocatalytic Nanostructures Based on Au/TiO₂/Reduced Graphene Oxide for Efficient Degradation of Organic Pollutants

Zhao

Xü

Jiang

et al. 2016

Part. Part. Syst. Charact.

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“…Compared with the Au 4f spectrum of the Au/Cu nanoscaffold before Li deposition (Figure 3e), two additional peaks were emerged at 87.1 and 90.7 eV after Li deposition (Figure 3f), corresponding to the Au 4f 5/2 and Au 4f 7/2 bands of Au (III) species. [ 38 ] Therefore, it could be concluded that the alloying reactions of Li metal with Au nanoseeds indeed occurred in the initial stage of Li deposition, resulting in a significant enhancement in Li wettability of the Au/Cu nanoscaffold and the improvement of the electrochemical kinetic performance of the electrodes.…”

Section: Resultsmentioning

confidence: 99%

Template‐Sacrificed Hot Fusion Construction and Nanoseed Modification of 3D Porous Copper Nanoscaffold Host for Stable‐Cycling Lithium Metal Anodes

Lin

Zhang

Wang

et al. 2021

Adv Funct Materials

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Lithium (Li) metal anodes have been proposed as a promising candidate for high-energy-density electrode materials in secondary batteries. However, the dendrite growth and unstable electrode-electrolyte interfaces during Li plating/ stripping are fatal to their practical applications. Herein, the construction of 3D porous Au/Cu nanoscaffold prepared via a convenient template-sacrificed hot fusion construction method and a nanoseed modification process as an effective Li metal hosting material are proposed. The Au/Cu nanoscaffold can spatially guide uniform deposition of Li metal free from the growth of Li dendrites due to the homogenous Li + ion flux and negligible nucleation overpotential. Moreover, the Cu skeleton can relieve volume change and stabilize local current density during cycling processes. Benefiting from these advantages, the symmetric cells based on self-supported Li-filled Au/Cu (Li-Au/Cu) nanoscaffold electrodes present highly stable Li plating/stripping for more than 1000 h with a low voltage hysteresis less than 90 mV and a long lifespan over 1300 h at 1.0 mA cm -2 in carbonate-based electrolytes. Impressively, the Li-Au/Cu nanoscaffold||LiFePO 4 full cells also exhibit exceptional cycling stability and rate performance. This work provides a promising strategy to construct dendritefree lithium metal anodes toward high-performance lithium metal batteries.

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“…The long flat plateaus at around 0.1 V/0.4 V displayed in Figure 8a and 8b are characteristic profiles for the lithiation/delithiation process of the crystalline Si [29] . While the short plateau at the 1.7 V/2.1 V exhibited in Figure 8b and Figure 8c corresponds to the lithiation/delithiation process of the anatase TiO 2 [24a,30] . Note that no obvious plateaus are observed for rutile TiO 2 in the mixed crystal (anatase/rutile) structure [31] .…”

Section: Resultsmentioning

confidence: 99%

Mutual Performance Enhancement within Dual N‐doped TiO₂/Si/C Nanohybrid Lithium‐Ion Battery Anode

Xie

Xia

et al. 2021

ChemistrySelect

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Dual N‐doped TiO2/Si/C ternary nanohybrid has been successfully prepared via a facile solvothermal method. Polyethylene glycol (PEG) is applied to disperse TiO2 and silicon precursors. After polymerization with hexamethylene diisocyanate (HDI) and calcination, N‐doped TiO2 and carbon matrix are obtained. The contents of Si, TiO2 and C in N‐doped TiO2/Si/C are about 10 %, 72 % and 18 % respectively. N‐doped TiO2/Si/C shows an excellent electrochemical performance due to combined advantages of Si, TiO2 and C. The initial discharge/charge specific capacity of the N‐doped TiO2/Si/C is 658/548 mAh g−1 at a current of 0.1 A g−1 with a coulombic efficiency of 83 %. A reversible capacity of 538 mAh g−1 is achieved after 80 cycles. While at the high current of 5 A g1, the specific capacity of the N‐doped TiO2/Si/C can still reach 120 mAh g−1. Electrochemical impedance spectroscopy measurements prove the improved electric conductivity after N‐doping.

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Hollow nanospheres composed of titanium dioxide nanocrystals modified with carbon and gold for high performance lithium ion batteries

Cited by 28 publications

References 45 publications

Synergetic Photocatalytic Nanostructures Based on Au/TiO₂/Reduced Graphene Oxide for Efficient Degradation of Organic Pollutants

Synergetic Photocatalytic Nanostructures Based on Au/TiO₂/Reduced Graphene Oxide for Efficient Degradation of Organic Pollutants

Template‐Sacrificed Hot Fusion Construction and Nanoseed Modification of 3D Porous Copper Nanoscaffold Host for Stable‐Cycling Lithium Metal Anodes

Mutual Performance Enhancement within Dual N‐doped TiO₂/Si/C Nanohybrid Lithium‐Ion Battery Anode

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Hollow nanospheres composed of titanium dioxide nanocrystals modified with carbon and gold for high performance lithium ion batteries

Cited by 28 publications

References 45 publications

Synergetic Photocatalytic Nanostructures Based on Au/TiO2/Reduced Graphene Oxide for Efficient Degradation of Organic Pollutants

Synergetic Photocatalytic Nanostructures Based on Au/TiO2/Reduced Graphene Oxide for Efficient Degradation of Organic Pollutants

Template‐Sacrificed Hot Fusion Construction and Nanoseed Modification of 3D Porous Copper Nanoscaffold Host for Stable‐Cycling Lithium Metal Anodes

Mutual Performance Enhancement within Dual N‐doped TiO2/Si/C Nanohybrid Lithium‐Ion Battery Anode

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Synergetic Photocatalytic Nanostructures Based on Au/TiO₂/Reduced Graphene Oxide for Efficient Degradation of Organic Pollutants

Synergetic Photocatalytic Nanostructures Based on Au/TiO₂/Reduced Graphene Oxide for Efficient Degradation of Organic Pollutants

Mutual Performance Enhancement within Dual N‐doped TiO₂/Si/C Nanohybrid Lithium‐Ion Battery Anode