Electrosynthesis of formate coupled green hydrogen production on the interface of CuMoO4 nanostructures: A novel electrocatalyst for hybrid water electrolysis system
Arunprasath Sathyaseelan, Shanmugam Ramasamy, Vijayakumar Elumalai, K. Prasanth, Noor Ul Haq Liyakath Ali, Parthiban Pazhamalai, Tukaram D. Dongale, Mohamed Sadiq Mohamed Saleem, Muthukumar Perumalsamy, Anandhan Ayyappan Saj, Sang‐Jae Kim
Abstract
Developing affordable/efficient catalysts for electrolytic co-production of green hydrogen and value-added products is a prime interest. However, efficient electronic structure engineering of transition metal-based catalysts remains challenging. Herein, we develop high-valent capsule-like copper molybdate (c-CMO) via ultrasonication-assisted strategy. XPS , XANES , KPFM , and DFT studies suggest strong Mo-Cu interaction in c-CMO alters its electronic structure, reduces work function , and lowers ∆G H* . In HER , c-CMO/PNF electrode achieved 130 mV@10 mA/cm² with higher MA and TOF than CO/PNF and MO/PNF electrodes and superior methanol-tolerance than Pt/C. MOR investigations suggest c-CMO/PNF requires 1.39 V@10 mA/cm², 0.239 V lower than OER . Qualitative/quantitative 1 H NMR confirms impressive HCOO − selectivity with ∼96 % Faradaic efficiency. The assembled hybrid AEM water-electrolyzer (HER+MOR) demonstrates 1 A/cm²@2 V (at 60 °C), outperforming HER+OER (2.25 V). The stability test of HAEMWE modeled/predicted using Time-Series-Analysis reveals statistically significant lags, indicating zero autocorrelation . This study emphasizes the development of efficient TMO based catalyst for HAEMWE.