Pt/CNDs-TiO 2 electrocatalyst for direct alcohol fuel cells

Gwebu, Sandile Surprise; Nomngongo, Philiswa N.; Maxakato, Nobanathi Wendy

doi:10.1016/j.matpr.2017.12.377

Cited by 9 publications

(5 citation statements)

References 38 publications

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“…The binding energy for pure Pt 0 is around 71.12 eV, however, upon addition of TiO 2 the binding energy of 4f 7/2 Pt 0 shifts to 71.53 eV. The positive shift indicates a strong metal-support interaction (SMSI) between the support material and the platinum catalyst [86] (Figure 5).…”

Section: Pt-tio 2 Compositesmentioning

confidence: 99%

“…They recommended that the functionalisation of CNT should be optimized. Gwebu et al [86] prepared a novel Pt/CNDs-TiO 2 nanocatalyst for methanol and ethanol electro-oxidation in acidic media. Observed results proved that blending carbon nanodots with TiO 2 not only improves the electroactivity of the nanocatalyst but also enhances the tolerance to poisoning and resistance to corrosion.…”

Section: Pt-tio 2 Compositesmentioning

confidence: 99%

mentioning

confidence: 99%

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Platinum-Based Carbon Nanodots Nanocatalysts for Direct Alcohol Fuel Cells

Gwebu¹,

Nomngongo²,

Maxakato³

2019

Nanocatalysts

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Platinum and its alloys are regarded as best nanocatalysts for the electro-oxidation of alcohol fuels especially in acidic conditions. The performance of nanocatalysts for alcohol fuel cells depends greatly on the support material. A good support material should have high surface area to obtain high metal dispersion. It should also bond and interact with the nanocatalysts to improve the activity of the overall electrode. Most importantly, the support material should offer great resistance to corrosion under the harsh fuel cell conditions. In this chapter, the use of carbon nanodots as support materials for Pt-Sn and Pt-TiO 2 nanoparticles is discussed. The electrochemical activity of Pt/CNDs, Pt-Sn/CNDs and Pt/CNDs-TiO 2 nanocatalysts was studied using cyclic voltammetry (CV) in acidic and alkaline conditions. Chronoamperometry (CA) was used to investigate the long-term stability of the nanocatalysts under the fuel cell environment. Electrochemical results demonstrated that binary Pt nanocatalysts are more active compared to monocatalysts. It was also observed that carbon nanodots are better support materials than carbon black. Blending carbon nanodots with titanium dioxide (a ceramic material) improves the corrosion resistance of the nanocatalyst. Cyclic voltammetry results also proved that alcohol electro-oxidation is enhanced in alkaline conditions.

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Section: Pt-tio 2 Compositesmentioning

confidence: 99%

Section: Pt-tio 2 Compositesmentioning

confidence: 99%

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Platinum-Based Carbon Nanodots Nanocatalysts for Direct Alcohol Fuel Cells

Gwebu¹,

Nomngongo²,

Maxakato³

2019

Nanocatalysts

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“…Due to the inherent efficiencies and use of sustainable fuels, fuel cells can help to reduce greenhouse gas emissions and mitigate future energy supply issues (such as blackouts or load-shedding events) [1,2]. Direct alcohol fuel cells (DAFCs) produce electricity through oxidation of alcohol fuel and reduction of oxygen gas at the anode and cathode electrodes, respectively [3][4][5]. Owing to their ability to utilize variable fuel sources, ease of integration, compatibility with different systems, and milder operating conditions, DAFCs have several advantages over their competitors [5].…”

Section: Introductionmentioning

confidence: 99%

Mn-Ni-Co-O Spinel Oxides towards Oxygen Reduction Reaction in Alkaline Medium: Mn0.5Ni0.5Co2O4/C Synergism and Cooperation

et al. 2021

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Mn-doped spinel oxides MnxNi1−xCo2O4 (x = 0, 0.3, 0.5, 0.7, and 1) were synthesized using the citric acid-assisted sol–gel method. The Mn0.5Ni0.5Co2O4 (x = 0.5) supported on carbon nanosheets, Mn0.5Ni0.5Co2O4/C, was also prepared using the same method employing NaCl and glucose as a template and carbon source, respectively, followed by pyrolysis under an inert atmosphere. The electrocatalytic oxygen reduction reaction (ORR) activity was performed in alkaline media. Cyclic voltammetry (CV) was used to investigate the oxygen reduction performance of MnxNi1−xCo2O4 (x = 0, 0.3, 0.5, 0.7, and 1), and Mn0.5Ni0.5Co2O4 was found to be the best-performing electrocatalyst. Upon supporting the Mn0.5Ni0.5Co2O4 on a carbon sheet, the electrocatalytic activity was significantly enhanced owing to its large surface area and the improved charge transfer brought about by the carbon support. Rotating disk electrode studies show that the ORR electrocatalytic activity of Mn0.5Ni0.5Co2O4/C proceeds via a four-electron pathway. Mn0.5Ni0.5Co2O4/C was found to possess E1/2(V) = 0.856, a current density of 5.54 mA cm−2, and a current loss of approximately 0.11% after 405 voltammetric scan cycles. This study suggests that the interesting electrocatalytic performance of multimetallic transition metal oxides can be further enhanced by supporting them on conductive carbon materials, which improve charge transfer and provide a more active surface area.

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“…Stability and cost are the major critical issues hindering the commercialization of direct alcohol fuel cells. To counteract the corrosion of carbon supports by acids, non-precious metal oxides such as titania (TiO 2 ) [12], tungsten trioxide (WO 3 ) [13], cerium oxide (CeO 2 ) [14], aluminium oxide (Al 2 O 3 ) [15], tin (IV) oxide (SnO 2 ) [16] and molybdenum oxide (MoO 3 ) [3] have been used as secondary supports. Zirconium dioxide nanoparticles have very attractive properties such as huge dielectric constants, fast electron transfer for the enhancement of CO adsorption on the surface of electrocatalyst, high sensitivity and stability under the fuel cell environment [17].…”

Section: Introductionmentioning

confidence: 99%

The influence of ZrO₂promoter in Pd/fCNDs-ZrO₂catalyst towards alcohol fuel electrooxidation in alkaline media

Gwebu

Maxakato

2020

Mater. Res. Express

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The severe corrosion of carbon supports has attracted the development of ceramic-based support materials. Non-precious metal oxides are potential support materials for fuel cells owing to their corrosion resistance under the harsh fuel cell environment. However, they cannot be used as primary support materials because they are not good electric conductors. In this study, we demonstrate that Pd nanoparticles supported on NaOH-functionalized carbon nanodots blended with zirconium dioxide can act as stable and electroactive anode catalysts for alkaline direct alcohol fuel cells (ADAFC). The Pd/fCNDs-ZrO 2 electrocatalyst was synthesized by a sonochemical method and characterized by x-ray diffraction (XRD) and transmission electron microscopy (TEM). Cyclic voltammetry (CV) and chronoamperometry (CA) were used to study the electrochemical activity and stability of the Pd/fCNDs-ZrO 2 catalyst towards methanol and ethanol oxidation in alkaline media. The observed results revealed that the Pd/fCNDs-ZrO 2 catalyst exhibits higher current densities (12.5 mA cm −2 for ethanol and 20.05 mA cm −2 for methanol) and lower poisoning rates compared to the Pd/fCNDs and commercial Pd/C catalysts.

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Pt/CNDs-TiO 2 electrocatalyst for direct alcohol fuel cells

Cited by 9 publications

References 38 publications

Platinum-Based Carbon Nanodots Nanocatalysts for Direct Alcohol Fuel Cells

Platinum-Based Carbon Nanodots Nanocatalysts for Direct Alcohol Fuel Cells

Mn-Ni-Co-O Spinel Oxides towards Oxygen Reduction Reaction in Alkaline Medium: Mn0.5Ni0.5Co2O4/C Synergism and Cooperation

The influence of ZrO₂promoter in Pd/fCNDs-ZrO₂catalyst towards alcohol fuel electrooxidation in alkaline media

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Pt/CNDs-TiO 2 electrocatalyst for direct alcohol fuel cells

Cited by 9 publications

References 38 publications

Platinum-Based Carbon Nanodots Nanocatalysts for Direct Alcohol Fuel Cells

Platinum-Based Carbon Nanodots Nanocatalysts for Direct Alcohol Fuel Cells

Mn-Ni-Co-O Spinel Oxides towards Oxygen Reduction Reaction in Alkaline Medium: Mn0.5Ni0.5Co2O4/C Synergism and Cooperation

The influence of ZrO2promoter in Pd/fCNDs-ZrO2catalyst towards alcohol fuel electrooxidation in alkaline media

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The influence of ZrO₂promoter in Pd/fCNDs-ZrO₂catalyst towards alcohol fuel electrooxidation in alkaline media