Ultrasonication-assisted Synthesis of Nickel Tungstate Decorated on Polydimethoxyaniline Nanocomposite Catalyst for Potential Direct Methanol Fuel Cell Application

Veni Keertheeswari Natarajan1

Suba Lakshmi Madaswamy1

Nishkala Krishnamoorthy1

Gopinath Ramamoorthy2

Ragupathy Dhanusuraman1,Email

1Nano Electrochemistry Lab (NEL), Department of Chemistry, National Institute of Technology Puducherry, Karaikal, 609609, India.
2Department of Chemistry, Annamalai University, Annamalai Nagar, Tamilnadu 608 002, India.

Abstract

DMFC has various advantages as a promising energy source. The present study demonstrates a simple and facile synthesis of poly 2,5 dimethoxy aniline (PDMA), nickel tungstate (NiWO4), and, nickel tungstate over poly 2,5 dimethoxy aniline (NiWO4@PDMA electrocatalyst) by ultrasonication strategy in the field of electro-oxidation of methanol in alkaline condition. The morphology of the modified electrode was studied by SEM with EDX mapping, the molecular vibrational studies were done through FT-IR spectroscopy, and crystalline nature was analyzed by XRD analysis. The electrochemical behavior was investigated using cyclic voltammetry, electrochemical impedance studies, and chronoamperometric experiments. NiWO4 and NiWO4@PDMA electrocatalyst gave an ECSA value of 2.83 cm2/g and 5.90 cm2/g respectively. NiWO4@PDMA electrocatalyst modified electrode showed excellent electrocatalytic activity, longer stability, and durability (60 min), with 90 % cyclic retention. The results attained showed that the NiWO4@PDMA electrocatalyst is a better alternative for efficient methanol oxidation reaction (MOR) in the area of fuel cells.

Ultrasonication-assisted Synthesis of Nickel Tungstate Decorated on Polydimethoxyaniline Nanocomposite Catalyst for Potential Direct Methanol Fuel Cell Application