Electrocatalytic performance of Pd/PANI/TiO 2 nanocomposites for methanol electrooxidation in alkaline media

Herein, perylene-3,4,9,10-tetracarboxylic acid-doped polyaniline (PTP) nanofibers with/without photoreactive anatase TiO 2 (TiO 2 –PTP and PTP, respectively) have been successively synthesized and subsequently decorated by Pt nanoparticles (Pt NPs) to prepare Pt–PTP and Pt–TiO 2 –PTP composites. High-resolution transmission electron microscopy confirms the presence of ∼3 nm spherical-shaped Pt NPs on both the composites along with TiO 2 on Pt–TiO 2 –PTP. Pt loading on the composites is deliberately kept similar to compare the methanol electro-oxidation in the two composites. The Pt nanocomposites along with the precursor polyanilines are characterized by optical characterization, X-ray diffraction study, X-ray fluorescence spectroscopy, and Raman spectroscopy. The ternary composite-modified (Pt–TiO 2 –PTP) electrode demonstrates high electrocatalytic performance for methanol oxidation reaction in acid medium than Pt–PTP and Pt–TiO 2 . The higher electrochemical surface area (1.7 times), high forward/backward current ratio, and the higher CO tolerance ability for Pt–TiO 2 –PTP make it a superior catalyst for methanol oxidation reaction in the electrochemical process than Pt–PTP. Moreover, the catalytic activity of Pt–TiO 2 –PTP is further enhanced significantly with light irradiation. The cooperative effects of photo- and electrocatalysis on methanol oxidation reaction in Pt–TiO 2 –PTP enhance the methanol oxidation catalytic activity approximately 1.3 times higher in light illumination than in dark. Therefore, the present work will be proficient to get a light-assisted sustainable approach for developing the methanol oxidation reaction activity of Pt NP-containing catalysts in direct methanol fuel cells.

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“…From this linear plot, it can be concluded that the methanol oxidation on both the modified electrodes is a diffusion-controlled process. 58,59…”

Section: Resultsmentioning

confidence: 99%

Enhanced Photoinduced Electrocatalytic Oxidation of Methanol Using Pt Nanoparticle-Decorated TiO₂–Polyaniline Ternary Nanofibers

et al. 2018

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“…However, significant challenges still remain for satisfactory electrocatalytic activity and stability when shape‐controlled Pd NCs are employed as catalysts in various electrocatalytic reactions. To overcome the limitations of Pd NCs in electrocatalytic reactions, incorporation of a conductive polymer into Pd NCs is one of the effective strategies recently explored in various electrocatalytic applications . Among various conductive polymer candidates, polyaniline (PANI) is a promising candidate due to its high electrical conductivity originating in π‐π conjugation and its remarkable stability during operation potentials .…”

Section: Acknowledgmentsmentioning

confidence: 99%

“…[1][2][3] Among the various shapes of NCs, Pd nanocubes have attracted enormous interest as electrocatalysts compared with Pd NCs enclosed of low-index facets such as octahedral and spherical NCs. 7,8 Among various conductive polymer candidates, polyaniline (PANI) is a promising candidate due to its high electrical conductivity originating in π-π conjugation and its remarkable stability during operation potentials. To overcome the limitations of Pd NCs in electrocatalytic reactions, incorporation of a conductive polymer into Pd NCs is one of the effective strategies recently explored in various electrocatalytic applications.…”

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confidence: 99%

Controlled Synthesis of Pd Nanocube‐Polyaniline Hybrids for Ethanol Oxidation Reaction

Kim

Hong

2018

Bulletin Korean Chem Soc

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“…Such materials not only work in a similar way to mineral semiconductors but also have positive features such as environmental friendliness characteristics, easy preparation and light weight. Using a polymer as photoelectrode is original and modified PANI is attractive owing to its better stability and low cost [42,43]. The potential of the conduction band (CB) is more cathodic than the H2 level making PANI attractive for the reduction of water into hydrogen [44,45].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of New Modified System: Polyaniline/1.5-Naphtalene Disulfonic Acid as Novel Photocatalyst in the H2 Production

Hamlaoui

Naar

Saib

et al. 2021

Preprint

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The semiconducting properties of the system Polyaniline / 1.5-naphtalene disulfonic acid are investigated for the first time to assess its photocatalytic performance for the hydrogen evolution under visible light irradiation. PANI is thermally stable up to ~ 300 °C, above which a weight loss of ~ 1.2% occurs. The X-ray diffraction pattern shows broad peaks with a particle size of ~ 7 nm, leading to an active surface area of ∼ 400 m2 g−1. A direct optical transition at 1.96 eV, is determined from the diffuse reflectance spectrum. The electrical conductivity of PANI-NDSA follows an exponential law with activation energy of 0.24 eV. The p-type conduction of PANI-NDSA is evidenced from the (capacitance-2 – potential) characteristic plot; a flat band potential (Efb) of 0.82 VSCE and a holes density (NA) of 8.43× 1024 m-3 are determined in neutral solution (Na2SO4 0.1 M). The electrochemical impedance spectroscopy, measured over an extended frequency domain (1 mHz - 1010 Hz), indicates the contribution of both the bulk and grain boundaries with a constant phase element (CPE). As application, PANI-NDSA is successfully tested for the hydrogen production upon visible light owing to the potential of its conduction band (-0.75 VSCE), less cathodic than that of H2O/H2 (~ -0.30 VSCE). H2 liberation rate of 3840 h-1 (g catalyst)-1 and a quantum efficiency of 0.34% under full light (29 mW cm-2) are obtained using Fe(CN)64- as reducing agent. The photoactivity is completely restored during the second cycle.

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Electrocatalytic performance of Pd/PANI/TiO 2 nanocomposites for methanol electrooxidation in alkaline media

Cited by 66 publications

References 50 publications

Enhanced Photoinduced Electrocatalytic Oxidation of Methanol Using Pt Nanoparticle-Decorated TiO₂–Polyaniline Ternary Nanofibers

Enhanced Photoinduced Electrocatalytic Oxidation of Methanol Using Pt Nanoparticle-Decorated TiO₂–Polyaniline Ternary Nanofibers

Controlled Synthesis of Pd Nanocube‐Polyaniline Hybrids for Ethanol Oxidation Reaction

Preparation and Characterization of New Modified System: Polyaniline/1.5-Naphtalene Disulfonic Acid as Novel Photocatalyst in the H2 Production

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Electrocatalytic performance of Pd/PANI/TiO 2 nanocomposites for methanol electrooxidation in alkaline media

Cited by 66 publications

References 50 publications

Enhanced Photoinduced Electrocatalytic Oxidation of Methanol Using Pt Nanoparticle-Decorated TiO2–Polyaniline Ternary Nanofibers

Enhanced Photoinduced Electrocatalytic Oxidation of Methanol Using Pt Nanoparticle-Decorated TiO2–Polyaniline Ternary Nanofibers

Controlled Synthesis of Pd Nanocube‐Polyaniline Hybrids for Ethanol Oxidation Reaction

Preparation and Characterization of New Modified System: Polyaniline/1.5-Naphtalene Disulfonic Acid as Novel Photocatalyst in the H2 Production

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Product

Resources

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Enhanced Photoinduced Electrocatalytic Oxidation of Methanol Using Pt Nanoparticle-Decorated TiO₂–Polyaniline Ternary Nanofibers

Enhanced Photoinduced Electrocatalytic Oxidation of Methanol Using Pt Nanoparticle-Decorated TiO₂–Polyaniline Ternary Nanofibers