Abstract
The clean and green hydrogen energy production by electrochemical process is gaining great attention in recent years. For this, designing an efficient and cost-effective electrocatalyst for the hydrogen evolution reaction (HER) is highly desirable. Herein, Co-Ni-Mn based bimetallic sulfides electrocatalysts are developed for HER in 1 M KOH. Owing to the presence of abundant electrochemical active sites and micro flower-like morphology, the fabricated Co-Ni-S, Ni-Mn-S, Co-Mn-S electrodes deliver the small overpotential of 136, 112, 75 mV to reach the current density of 10 mA cm−2. For practical applications, the commercially available 1.6 V battery is used to drive the overall water splitting process of the device fabricated with the two-electrode system (symmetric device). In addition to this, in this research work, a graphite rod extracted from a spent battery is directly used as a counter electrode for the entire electrochemical study to substitute platinum (Pt) counter electrode. This approach is sustainable as well as eco-friendly.
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