Polyaniline-wrapped MnMoO4 as an active catalyst for hydrogen production by electrochemical water splitting

Mohaseen S Tamboli; Supriya A Patil; Asiya M Tamboli; Santosh S Patil; Nguyen Tam Nguyen Truong; Kiyoung Lee; C S Praveen; Nabeen K Shrestha; Chinho Park; Bharat B Kale

doi:10.1039/d2dt00032f

Polyaniline-wrapped MnMoO₄ as an active catalyst for hydrogen production by electrochemical water splitting

Dalton Trans. 2022 Apr 12;51(15):6027-6035. doi: 10.1039/d2dt00032f.

Authors

Affiliations

¹ Korea Institute of Energy Technology (KENTECH), 200 Hyeokshin-ro, Naju, Jeollanam-do 58330, Republic of Korea. chpark@kentech.ac.kr.
² Department of Nanotechnology and Advanced Materials Engineering, Sejong University, Seoul 05006, Republic of Korea.
³ Department of Chemistry and Chemical Engineering, Inha University, 100 Inha-ro, Michuhol-gu, 22212, Incheon, South Korea.
⁴ School of Chemical Engineering, Yeungnam University, 280 Daehak-ro, Gyeongsan, 38541, Republic of Korea.
⁵ International School of Photonics, Cochin University of Science and Technology, University Road, South Kalamasssery, Kalamassery, Ernakulam, Kerala, 682022, India.
⁶ Division of Physics and Semiconductor Science, Dongguk University, Seoul, South Korea.
⁷ Centre for Materials for Electronics Technology (C-MET), Ministry of Electronics and Information Technology (MeitY), Government of India, Panchawati Off Pashan Road, Pune -411008, India. bbkale@cmet.gov.in.

PMID: 35352748
DOI: 10.1039/d2dt00032f

Abstract

Developing efficient, low-cost, and environment-friendly electrocatalysts for hydrogen generation is critical for lowering energy usage in electrochemical water splitting. Moreover, for commercialization, fabricating cost-efficient, earth-abundant electrocatalysts with superior characteristics is of urgent need. Towards this endeavor, we report the synthesis of PANI-MnMoO₄ nanocomposites using a hydrothermal approach and an in situ polymerization method with various concentrations of MnMoO₄. The fabricated nanocomposite electrocatalyst exhibits bifunctional electrocatalytic activity towards the oxygen evolution reaction (OER) and the hydrogen evolution reaction (HER) at a lower overpotential of 410 mV at 30 mA cm^-2 and 155 mV at 10 mA cm^-2, respectively in an alkaline electrolyte. Furthermore, while showing overall water splitting (OWS) performance, the optimized PM-10 (PANI-MnMoO₄) electrode reveals the most outstanding OWS performance with a lower cell voltage of 1.65 V (vs. RHE) at a current density of 50 mA cm^-2 with an excellent long-term cell resilience of 24 h.