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Electrochemically active platinum nanoparticles (Pt NPs) on carbon nanofibers (CNF) with electron-conducting polyaniline (PANi) nanocomposite fabricated by in situ electrodeposition using cyclic voltammetry on glassy carbon electrode (GCE). The bridging between the Pt NPs and CNF with the occurrence of platinum nitride (Pt–N) bonding and π–π bonding demonstrated the stability of PANi. Structural geometry and morphological view authenticates the successful formation of GCE/PANi-CNF-Pt electrocatalyst. To investigate the electrocatalytic performance of the synthesized nanocomposite, cyclic voltammetry, electrochemical impedance spectroscopy and chronoamperometry methods were used in this work. As a result of π–π and electrostatic bonding, the prepared PANi is found to be wrapped with CNF and Pt NPs facilitates in efficient and rapid electron transfer pathway with good stability. Overall, electrochemically active GCE/PANi-CNF-Pt catalyst exhibits excellent electrocatalytic properties and promises potential applications in DMFCs. [ABSTRACT FROM AUTHOR]

The cobalt selenide nanoparticles (CoSe NPs) were prepared by a simple hydrothermal method, and polyaniline nanofibers (PANI NFs) were prepared by a chemical oxidative polymerization and its composite NFs were prepared by incorporating CoSe onto PANI at the optimized wt% 1:1 by ultrasonication to use as a newer photocathode for dye‐sensitized solar cells (DSSCs). The physio‐chemical properties of the prepared CoSe NPs/PANI NFs composite NFs were investigated by field emission scanning electron microscope, X‐ray diffractometer, and Raman spectroscopy. The results revealed that the phase pure CoSe NPs were decorated onto the PANI NFs without affecting their physio‐chemical nature. The electrochemical characteristics of CoSe NPs/PANI NFs composite NFs as photocathode were investigated by electrochemical AC‐impedance, cyclic voltammetry, and Tafel polarization studies. The CoSe decorated PANI composite NFs displayed excellent electrocatalytic behavior toward the tri‐iodide reduction. Further, DSSC fabricated with CoSe/PANI composite NFs as the photocathode exhibited the highest photoconversion efficiency of 9.14% than that of the pristine CoSe NPs and PANI NFs‐based counter electrodes (CEs). This is attributed to the synergistic electrocatalytic ability of CoSe NPs and the multiple interfacial charge transferability of PANI NFs. These results suggest that CoSe decorated PANI composite NFs could be used as a promising CE to fabricate high‐performance DSSC. [ABSTRACT FROM AUTHOR]

Summary: In this study, we report a new phosphotungstic acid‐Titania embedded polyaniline (PANI/PTA/TiO2) nanocomposite modified hybrid electrode for efficient methanol electro‐oxidation reaction. The PANI/PTA/TiO2 nanocomposite was prepared via a simple in‐situ polymerization method. The fabricated modified electrode's surface morphology and elemental analysis were characterized using field‐emission scanning electron microscopy with energy‐dispersive X‐ray spectroscopy and mapping technique. The phase structure and molecular vibrational studies were identified using an X‐ray diffraction and Fourier‐transform infrared spectroscopic techniques. The electrochemical performance of the modified electrodes was studied using cyclic voltammetry, chronoamperometry, and electrochemical impedance spectroscopic techniques. The PANI/PTA/TiO2 nanohybrid modified electrode displayed the superior electro‐catalytic activity towards methanol oxidation reaction at 0.2 V potential with the charge transfer resistance of 218 Ω, and showed excellent stability up to 1200s in an alkaline medium. The developed nanocomposite material can be used as a potential nanohybrid anode catalyst for the application of direct methanol fuel cells. [ABSTRACT FROM AUTHOR]

Summary: In this study, a simple and facile electrochemical deposition technique was employed to fabricate fluorine‐doped tin oxide‐based polydiphenylamine‐polyaniline/phosphotungstic acid copolymer nanocomposite modified electrode (FTO/PDPA‐PANI/PTA) for high‐performance supercapacitors application. Crystalline and morphological structure and coating thickness of PDPA‐PANI/PTA nanocomposite on FTO were characterized using X‐ray diffraction, scanning electron microscope, and atomic force microscope. The fabricated nanohybrid electrode exhibits superior specific capacitance of 360 Fg−1 at 1 mA current density. The higher capacitive behavior and cyclic steadiness of FTO/PDPA‐PANI/PTA modified electrode were achieved because of the presence of tungsten in the PDPA/PANI co‐polymer nanonetworks provide efficient interaction which enhances the fast electron transfer progressions. Electrochemical impedance spectroscopic (EIS) studies ensure the capacitive behavior of the electrodeposited nanohybrid modified electrode with a characteristic EIS semicircle in the lower frequency region. Further, a superior specific capacitance with 82% excellent capacitance retention after 1000 cycles, recommends a practical application in supercapacitor device electrodes. [ABSTRACT FROM AUTHOR]

• Simple one-step fabrication of novel nanohybrid composite by electro-co-deposition. • Graphitic carbon nitride/Polyaniline/Palladium nanoparticles nanohybrid composite. • g-C 3 N 4 /PANI/PdNPs nanohybrid composite modified ASPE. • Superior electro-oxidation and excellent catalytic performance over methanol oxidation. • Potential electrocatalyst material for the direct methanol fuel cell applications. In this work, we report a simple one-step preparation of a novel graphitic carbon nitride/Polyaniline/Palladium nanoparticles (g-C 3 N 4 /PANI/PdNPs) based nanohybrid composite modified screen-printed electrode (SPE) for the efficient electro-oxidation reaction of methanol. g-C 3 N 4 /PANI/PdNPs nanohybrid structure was achieved by a single-step simultaneous electro-deposition method with an electrolyte solution containing palladium chloride, aniline, and g-C 3 N 4 nanosheets. Structural and morphological characterizations depicted that the needle-shaped PANI and spherical shaped Pd NPs were deposited between g-C 3 N 4 nanomatrix. The electrocatalytic behavior of the as-prepared nanohybrid composite modified SPE was assessed using cyclic voltammograms and chronoamperometric method, and it showed superior electro-oxidation and excellent catalytic performance over methanol oxidation compared to commercial 10% palladium loaded carbon black material and other previously reported electrode materials. These outcomes proved that the newly developed nanohybrid composite could be used as a potential electrocatalyst material for the direct methanol fuel cell applications. [ABSTRACT FROM AUTHOR]

In this study, a facile one-step homogeneous electrochemical deposition method was utilized to fabricate poly(aniline-2,5-dimethoxyaniline)co-polymer (PANI-PDMA) nanocomposite coated on the surface of graphite sheet (GS) electrode for an effective high-performance supercapacitor application. Physio-chemical characterizations were examined using FT-IR, XRD, and energy-dispersive X-ray spectroscopy (EDX) techniques. The morphological view of as-synthesized copolymer nanocomposite was characterized using the FE-SEM technique. Electrochemical investigation of the as-fabricated modified electrode (GS/PANI-PDMA) was studied using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and galvanostatic charging and discharging (GCD) studies. Based on electrochemical studies, GS/PANI-PDMA modified co-polymer electrode shows a high specific capacitance of 595 F/g compared to GS@PANI and GS@PDMA. After 1000 cycles, it indicates 67% capacitance retention, which is indicated to be a potential alternative material for supercapacitor application. • Facile preparation of copolymer of poly(aniline-2,5-dimethoxyaniline) nanocomposite. • PANI-PDMA nanocomposite coated graphite sheet (GS) electrode was fabricated. • A simple electrochemical deposition method was applied for electrode fabrication. • GS@PANI-PDMA nanocomposite shows a significant specific capacitance 595 F/g. • Energy density and power density were 52.8 W h kg−1 and 399 W kg−1. [ABSTRACT FROM AUTHOR]

[Display omitted] • Facile synthesis of novel MnO 2 /polyaniline/graphitic carbon nitride nanocomposite. • MnO 2 /PANI-GCN modified GS electrode via electrochemical deposition method. • MnO 2 /PANI-GCN modified electrode exhibits better specific capacitance of 318 F/g. • The proposed electrode had shown the capacitive retention of 82 % up to 1000 cycles. • MnO 2 @PANI-GCN electrode show lower charge transfer resistance. Supercapacitors are gaining popularity as a component in energy storage systems due to their quick charge/discharge rates and high specific power. A facile method is introduced in this research to fabricate a novel ternary nanocomposite-based manganese oxide decorated on polyaniline/graphitic carbon nitride (PANI-GCN) nanohybrid modified graphite sheet (GC) electrode via the electrochemical deposition method. As-prepared nanocomposite modified electrode morphology, elemental analysis, surface functionalities studies, and crystalline behavior are proved using SEM, Energy Dispersive Analysis, FT-IR, and XRD techniques. The electrochemical measurements are obtained by CV, GCD, and EIS. For Bare GS, PANI, and PANI-GCN, the solution resistance (Rs) that gauges the ionic conductivity across the electrolyte, was measured to be 60.57 Ω, 7.28 Ω, and 6.19 Ω, respectively. A greater specific capacitance of 318 F/g at 1 A/g was displayed by the developed MnO 2 @PANI-GCN electrode and lower charge transfer resistance over the PANI and PANI-GCN electrodes. Furthermore, the proposed electrode has shown the capacitive retention of 80.62% up to 1000 cycles. These results indicate that the ternary nanocomposite MnO 2 @PANI-GCN shows significant electrochemical properties towards energy storage applications. [ABSTRACT FROM AUTHOR]

In this work, we prepare a palladium nanoparticle dispersed on polyaniline and polydiphenylamine copolymer (Pd@PANI-PDPA) nanocomposite by in situ oxidative polymerization followed by reduction method. The synthesized Pd@PANI-PDPA nanocomposite morphology, chemical composition, molecular vibrational spectra, and crystallographic structure were analyzed by field-emission scanning electron microscopy (FESEM), energy-dispersive X-ray spectroscopy with mapping (EDX), Fourier-transform infrared spectroscopy (FT-IR), and X-ray diffraction pattern (XRD) techniques respectively. The electrocatalytic activity of the Pd@PANI-PDPA nanocomposite modified electrode is studied by cyclic voltammetry, impedance, and chronoamperometry studies. The electrocatalyst Pd@PANI-PDPA exhibits higher electrochemical active surface area, excellent activity (lower oxidation potential, significant cyclic stability, and durability) towards methanol and ethanol oxidation reaction in an alkaline medium than pure Pd, Pd@PDPA, Pd@PANI electrocatalyst. The electrocatalyst Pd@PANI-PDPA nanocomposite modified glassy carbon electrode can be a remarkable anode catalyst for direct alcohol oxidation reaction in the future. [Display omitted] • Palladium nanoparticle dispersed on polyaniline and polydiphenylamine copolymer nanocomposite was prepared. • Pd@PANI-PDPA decorated on modified glassy carbon electrode as anode for alcohol oxidation reaction. • Remarkable electrocatalytic activity towards methanol and ethanol oxidation reaction. • The electrocatalyst Pd@PANI-PDPA displays outstanding activity, stability and durability higher than pure Pd. [ABSTRACT FROM AUTHOR]

[Display omitted] • One-step fabrication of MXene nanosheets/polyaniline/palladium nanocomposite electrode. • As-prepared electrode showed efficient electrocatalytic oxidation of methanol. • PANI/Pd/MXene nanocomposite depicts higher MEOR current density than Pd/MXene. Slow methanol oxidation reaction kinetics with current electrocatalysts is the major limitation to widespread application and development in direct-methanol fuel cells (DMFCs). The present work demonstrates a highly efficient electrocatalyst for methanol electrooxidation reaction (MEOR) using polyaniline/palladium/Ti 3 C 2 T x (PANI/Pd/MXene) nanocomposite. The PANI/Pd/MXene nanocomposite was prepared using a one-pot electrochemical co-deposition technique with a pre-anodized screen-printed electrode (SPE) under acidic electrolyte solution containing Ti 3 C 2 T x , aniline, and palladium chloride as precursors. The PANI/Pd/MXene nanocomposite was examined using FESEM, TEM, FT-IR, XPS, and cyclic voltammetric techniques. The electrochemical response of the PANI/Pd/MXene nanocomposite shows enhanced electrocatalytic response towards the oxidation of methanol, with a peak current density of 291 mA cm−2, approximately three times higher than Pd/MXene (106 mA cm−2). Furthermore, it was also stable up to 100 cycles. The electrochemically active PANI/Pd sites are incorporated with MXene nanosheets, facilitating a more efficient MEOR. This stimulating result was achieved due to the sturdy metal–support interactions between PANI/Pd and MXene nanosheets that provide maximum methanol adsorption on the electrode surface for efficient electrocatalytic oxidation. Thus, the Ti 3 C 2 T x support tailors the metal electrocatalyst interface and surface properties, resulting in improved electrocatalytic performance. This study highlights a facile approach for designing MXene-supported noble metal electrocatalysts for MEOR in direct-methanol fuel cells. [ABSTRACT FROM AUTHOR]