Polyaniline-wrapped MnMoO 4 as an active catalyst for hydrogen production by electrochemical water splitting.

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-MnMoO 4 nanocomposites using a hydrothermal approach and an in situ polymerization method with various concentrations of MnMoO 4 . 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-MnMoO 4 ) 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.