Carbon nanotubes sheathed in lead for the oxygen evolution in zinc electrowinning

Yang, Chenchen; Shen, Qingfeng; Zhai, Da-cheng; Gu, Yu

doi:10.1007/s10800-018-1277-0

Cited by 10 publications

(3 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The ratio for untreated electrodes changed after being loaded with Si, demonstrating a decrease in MWCNT formation intensified by the presence of more disordered carbon in the array. The I D / I G ratio for plain MWCNT electrodes and 1.1 Si/MWCNT composites increased after cycling or charging/discharging, proving that a large number of defects were present on the surface of the electrodes where ions are favorably stored into the graphene layers. − The 1.1 Si/MWCNT composites have a higher graphitization degree compared with the plain MWCNTs, which results from the microcrystalline structure of MWCNTs , shifting both D- and G-bands …”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Investigation of Si-Coated Multiwalled Carbon Nanotubes as Potential Electrodes for Multivalent Metal-Ion Electrochemical Energy Storage Systems

et al. 2023

View full text Add to dashboard Cite

In the present paper, we report the chemical vapor deposition of multiwall carbon nanotubes (MWCNTs) coating on stainless steel substrates and the coverage of the individual CNTs by a silicon (Si) thin layer. The study's goal is to create and evaluate electrochemically Si/MWCNT composites with varying Si loadings to act both as a mechanical support and electrical conducting path to the current collector. MWCNTs incorporated efficiently into the Si layer on their surface and aided Si's poor stability while maintaining its high-capacity values. The Si/ MWCNT composite electrodes operated in a wide potential window of 1.7 V with improved Q/V ratios (charge to voltage) and retention over cycling compared to plain MWCNTs and Si electrodes, despite the similar surface area. In addition, the composite electrodes displayed a larger integration area in cyclic voltammograms, distinct charge/discharge plateaus, and wider discharge potential, indicating a higher energy storage capacity and high relative voltammetric charge retention. In particular, the Si/ MWCNT electrodes demonstrated relative voltammetric charge retentions of 99.3% and 68% at 100 mV s −1 and stable Q/V ratios of 231 and 209 mF cm −2 at a current density of 2 mA cm −2 with retention maintained at 100% after 30 cycles in ZnSO 4 and Al 2 (SO 4 ) 3 aqueous electrolytes, respectively. Although the Q/V ratios may have distinct origins, we assumed that both electrolytes incorporate a mix of surface and bulk contributions. A combination of both ionic diffusion and pseudocapacitive behavior is displayed. Combined charge storage mechanisms are present at different electrode states, indicating the electrolyte ions' adsorption (surfacecontrolled) and insertion (diffusion-controlled) in the active sites of the composites. The results suggested that the pseudocapacitive nature combined with the reversible diffusion of ions during redox reactions worked synergistically to increase contributions to the overall Q/V ratios. The storage of ions is facilitated by the small ionic radius of Al 3+ (0.53 Å) and Zn 2+ (0.75 Å) ions. Diffusion coefficient values of Al 3+ (4.58 × 10 −11 cm 2 s −1 ) are higher than those of Zn 2+ (3.16 × 10 −11 cm 2 s −1 ) during oxidation but lower at reduction processes (6.02 × 10 −11 and 7.1 × 10 −11 cm 2 s −1 ). As a result, the Al 3+ ions are less effective while extracted with reduced reversibility than Zn 2+ ions. Agglomerations of smaller ions stored in electrodes might confine the extraction process and possibly the overall stability over intense cycling. The faradaic performance on the one side coupled with the semi-infinite diffusion and pseudocapacitive behavior could offer a promising utilization as working electrodes in Zn 2+ and Al 3+ ion hybrid energy storage systems.

show abstract

Section: Resultsmentioning

confidence: 99%

“…116−118 The 1.1 Si/MWCNT composites have a higher graphitization degree compared with the plain MWCNTs, which results from the microcrystalline structure of MWCNTs 42,95 shifting both D-and G-bands. 119 4.4. Scanning Electron Microscopy−Energy-Dispersive X-ray Spectroscopy.…”

Section: Raman Spectroscopymentioning

confidence: 99%

Investigation of Si-Coated Multiwalled Carbon Nanotubes as Potential Electrodes for Multivalent Metal-Ion Electrochemical Energy Storage Systems

et al. 2023

View full text Add to dashboard Cite

show abstract

“…It is known that CNTs are metallic with high conductivity of $100 S m À1 (about 2-fold that of PbO 2 ($59 S m À1 )). 44,45 The addition of CNTs could bridge the PbO 2 and Ti substrate, and result in low R ct (shown in Table 3). Xu et al also found that CNTs could support a long-term electron exchange between the Pt and Pd without direct atomic contact.…”

Section: The Electrocatalytic Activity For Oer Characterizationsmentioning

confidence: 99%

α(β)-PbO₂ doped with Co₃O₄ and CNT porous composite materials with enhanced electrocatalytic activity for zinc electrowinning

Wang

Feng

et al. 2020

RSC Adv.

View full text Add to dashboard Cite

show abstract

LaCoO3-modified RuO2–TiO2/Ti electrode as an efficient electrocatalyst for oxygen evolution reaction

Zhang

et al. 2020

J Appl Electrochem

View full text Add to dashboard Cite

Carbon nanotubes sheathed in lead for the oxygen evolution in zinc electrowinning

Cited by 10 publications

References 48 publications

Investigation of Si-Coated Multiwalled Carbon Nanotubes as Potential Electrodes for Multivalent Metal-Ion Electrochemical Energy Storage Systems

Investigation of Si-Coated Multiwalled Carbon Nanotubes as Potential Electrodes for Multivalent Metal-Ion Electrochemical Energy Storage Systems

α(β)-PbO₂ doped with Co₃O₄ and CNT porous composite materials with enhanced electrocatalytic activity for zinc electrowinning

LaCoO3-modified RuO2–TiO2/Ti electrode as an efficient electrocatalyst for oxygen evolution reaction

Contact Info

Product

Resources

About

Carbon nanotubes sheathed in lead for the oxygen evolution in zinc electrowinning

Cited by 10 publications

References 48 publications

Investigation of Si-Coated Multiwalled Carbon Nanotubes as Potential Electrodes for Multivalent Metal-Ion Electrochemical Energy Storage Systems

Investigation of Si-Coated Multiwalled Carbon Nanotubes as Potential Electrodes for Multivalent Metal-Ion Electrochemical Energy Storage Systems

α(β)-PbO2 doped with Co3O4 and CNT porous composite materials with enhanced electrocatalytic activity for zinc electrowinning

LaCoO3-modified RuO2–TiO2/Ti electrode as an efficient electrocatalyst for oxygen evolution reaction

Contact Info

Product

Resources

About

α(β)-PbO₂ doped with Co₃O₄ and CNT porous composite materials with enhanced electrocatalytic activity for zinc electrowinning