Abstract
The electrolysis of water is the key method for hydrogen production but the high overpotential necessitates electrocatalysts. Traditionally, Pt is used, but it is scarce and costly. Herein, MnCO3 is unveiled as an electrocatalyst for the production of hydrogen. MnCO3 is electrodeposited onto pencil graphite by chronoamperometric method and confirmed by XRD and vibrational spectroscopic studies. MnCO3 electrodeposited for 15 min at 2 V demonstrates a good HER activity (overpotential of 123 mV to reach 10 mA cm−2) in 0.5 M H2SO4 with a Tafel slope of 79 mV dec−1. In addition, MnCO3 exhibited good stability during continuous operation (over 3000 cycles and 14 h). Though MnCO3 requires higher overpotential than the benchmark catalyst (Pt/C) to reach 10 mA cm−2, it outperforms Pt/C at higher current density (≥75 mA cm−2) demonstrating that MnCO3 could be used as an electrocatalyst to produce H2 at a high rate from acidic medium.
Published Version
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