Bismuth-Doped Tin Oxide-Coated Carbon Nanotube Network: Improved Anode Stability and Efficiency for Flow-Through Organic Electrooxidation

Liu, Han; Vajpayee, Akshay; Vecitis, Chad D.

doi:10.1021/am402621v

Cited by 118 publications

(87 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…13 In such cases, the detoxification of aqueous Cr(VI), particularly when Cr(VI) is present at low concentration, often shows low current efficiency and results in high energy demand. 17 Flow-through porous electrodes demonstrate high current efficiency, enhanced mass transfer, and high volumetric rates of reaction and have been used in fuel cells, 18 electrooxidation, 19 desalination, 20 and adsorption. 21 This flow-through architecture enables optimal utilization of the active sites inside the porous electrodes and provides enhanced rates of mass transport, which could be especially useful for treatment of dilute solutions.…”

Section: ■ Introductionmentioning

confidence: 99%

Microfluidic Flow through Polyaniline Supported by Lamellar-Structured Graphene for Mass-Transfer-Enhanced Electrocatalytic Reduction of Hexavalent Chromium

Zhang

et al. 2015

Environ. Sci. Technol.

100

View full text Add to dashboard Cite

Owing to its high efficiency and environmental compatibility, electroreduction holds great promise for the detoxification of aqueous Cr(VI). However, the typical electroreduction system often shows poor mass transfer, which results in slow reduction kinetics and hence higher energy consumption. Here, we demonstrate a flow-through electrode of polyaniline supported on lamellar-structured graphene (LGS−PANI) for electrocatalytic reduction of Cr(VI). The reaction kinetics of the LGS− PANI flow-through electrodes are 6.4 times (at acidic condition) and 17.3 times (at neutral condition) faster than traditional immersed parallel-plate electrodes. Computational fluid dynamics simulation suggests that the flowthrough mode greatly enhances the mass transfer and that the nanoscale convection induced by the PANI nanodots increases the nanoscale mass transport in the interfacial region of the electrode/ solution. In situ Raman spectroscopy shows that the PANI−Cr(VI) redox reactions are dominated by the leucoemeraldine/ emeraldine transition at 1.5 V cell voltage, which also remarkably contributes to the fast reaction kinetics. Using single-pass flowthrough mode, the LGS−PANI electrode reaches an average reduction efficiency of 99.

show abstract

Section: ■ Introductionmentioning

confidence: 99%

Microfluidic Flow through Polyaniline Supported by Lamellar-Structured Graphene for Mass-Transfer-Enhanced Electrocatalytic Reduction of Hexavalent Chromium

Zhang

et al. 2015

Environ. Sci. Technol.

100

View full text Add to dashboard Cite

show abstract

“…The observed OEP for the TPTM/TMF/ATO 2.22 V (vs SCE) was significantly higher than that for TPTM/ATO 1.85 V (vs SCE). This OEP of 2.22 V is also higher than reported OEP of carbon nanotube (CNT) membranes (1.27 V) [6,7,36], metallic oxide (e.g., TiO 2 , SnO 2 , and Bi-doped SnO 2 )-coated carbon-based membranes (1.55-1.89 V) [1,4,7], and Ti 4 O 7 membranes (2.14 V) [3]. In addition, TPTM/TMF/ATO also gained a larger Tafel slope of 2.25 V than both TPTM/ATO (0.84 V, inset of Fig.…”

Section: Linear Polarization Curvesmentioning

confidence: 50%

“…In addition, TPTM/TMF/ATO also gained a larger Tafel slope of 2.25 V than both TPTM/ATO (0.84 V, inset of Fig. 5) and metallic oxide-coated carbon membranes (1.05-1.37 V) [7]. LSV and Tafel results indicate that introducing TMF between ATO and TPTM can effectively increase membrane's OEP and Tafel slope, which would help to delay onset of oxygen evolution side reactions and an improvement of the organic pollutant degradation efficiency.…”

Section: Linear Polarization Curvesmentioning

confidence: 89%

“…Among these, carbonaceous materials that include carbon nanotubes (CNTs) [5,6], graphene composite membranes [2] and carbon membranes [1,4] have drawn particular attention because of their high conductivity and low cost. These materials, however, are electrochemically unstable and liable to be oxidized when used as anodes [7]. Tubular porous titanium membranes (TPTM) that are composed of many micron-sized titanium particles have several unique features (e.g.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Using TiO2 Mesoflower Interlayer in Tubular Porous Titanium Membranes for Enhanced Electrocatalytic Filtration

Liu

Shi

et al. 2016

Electrochimica Acta

View full text Add to dashboard Cite

Keywords:functionalized tubular porous titanium membrane TiO 2 mesoflower interlayer electrocatalytic filtration anodic catalytic oxidation A B S T R A C T The current study focuses on synthesis and characterization of novel functionalized anodic membranes for wastewater treatment. This membrane was prepared by first constructing a TiO 2 mesoflower interlayer on a tubular porous titanium membrane and subsequently coating an antimony-doped tin oxide catalytic layer. Physical and electrochemical characterizations of the membranes were evaluated. With TiO 2 mesoflower, the membrane anode obtained a higher oxygen evolution potential, 2.22 V (vs saturated calomel electrode), relative roughness factor (701.7), and electrochemical porosity (99.23%) than membrane anodes without TiO 2 mesoflower. The prepared membrane anode also achieved a low charge-transfer (0.11 V) and mass-transfer resistance (0.21 V) in filtration mode. The unique features were found linked to its 3-D porous and open structure, and formation of a Ti 0.2 Sn 0.8 O 2 sosoloid that had a high surface oxygen (O ad ) content. The electrocatalytic filtration performance of this membrane was also tested using methyl orange as a model organic pollutant. At a current density of 15 mA cm À2 , the membrane achieved a higher 71.0% removal of methyl orange than 58.0% for the membrane without TiO 2 mesoflower. At a 58.0% removal of methyl orange, the membrane consumed a much lower energy of 0.20 kWh m À3 than 5.88 kWh m À3 for membrane anodes without TiO 2 mesoflower. The synthesized membrane electrode filter shows promise for future applications aimed to remove organic pollutants from wastewater.

show abstract

“…The Sb-SnO 2 /CA membrane, which had both a high OEP and good conductivity, exhibited improved current efficiency and enhanced electrode stability, resulting in complete degradation of organic pollutants unlike the original CA and SnO 2 /CA membranes. 27 Hence, Sb-SnO 2 /CA is an ideal material for efficient electrocatalytic filtration membranes.…”

Section: +mentioning

confidence: 99%

Novel antimony doped tin oxide/carbon aerogel as efficient electrocatalytic filtration membrane

et al. 2016

View full text Add to dashboard Cite

A facile method was developed to prepare antimony doped tin oxide (Sb-SnO2)/carbon aerogel (CA) for use as an electrocatalytic filtration membrane. The preparation process included synthesis of a precursor sol, impregnation, and thermal decomposition. The Sb-SnO2, which was tetragonal in phase with an average crystallite size of 10.8 nm, was uniformly distributed on the CA surface and firmly attached via carbon-oxygen-tin chemical bonds. Preliminary filtration tests indicated that the Sb-SnO2/CA membrane had a high rate of total organic carbon removal for aqueous tetracycline owing to its high current efficiency and electrode stability.

show abstract

Bismuth-Doped Tin Oxide-Coated Carbon Nanotube Network: Improved Anode Stability and Efficiency for Flow-Through Organic Electrooxidation

Cited by 118 publications

References 56 publications

Microfluidic Flow through Polyaniline Supported by Lamellar-Structured Graphene for Mass-Transfer-Enhanced Electrocatalytic Reduction of Hexavalent Chromium

Microfluidic Flow through Polyaniline Supported by Lamellar-Structured Graphene for Mass-Transfer-Enhanced Electrocatalytic Reduction of Hexavalent Chromium

Using TiO2 Mesoflower Interlayer in Tubular Porous Titanium Membranes for Enhanced Electrocatalytic Filtration

Novel antimony doped tin oxide/carbon aerogel as efficient electrocatalytic filtration membrane

Contact Info

Product

Resources

About