Work

Thermo‐Electric Powered High Energy‐Density Hybrid Supercapattery for Driving Overall Water Splitting: A Novel Trifunctional Builder for Self‐Powered Hydrogen Production

Year: 2025

Type: article

Abstract: Integrated electrochemical energy devices with multifunctionality are evolving as an auspicious way to lift up energy technology. However, the challenge is utilizing a single‐electrode material for multifunctional applications is essential to minimize the manpower and overall cost of the system. Herein, a novel and cost‐effective self‐powered aqueous electrochemical energy device (SAEED) is proposed via integrating asymmetric supercapattery (ASD) and water‐splitting (WS) devices utilizing Cu₃Mo₂O₉ (CMD) nanostructures on Ni‐foam (prepared via hydrothermal method) as a trifunctional electrode. First, the Cu 3 Mo 2 O 9 /Ni electrode is examined for the supercapacitor, which shows the faradaic‐type of charge‐storage behavior with a superior specific capacity of 588.88 mAh g −1 . The Cu 3 Mo 2 O 9 ǁgraphene ASD is constructed, which shows high energy storage performance with high device capacitance and energy/power densities and 98% retention capacitance over 5000 cycles. Second, the electrocatalyst behavior of the Cu₃Mo₂O₉/Ni electrode is explored, which reveals impressive HER/OER performance with lower overpotential (HER‐120 mV at 10 mA cm⁻²/OER‐310 mV at 50 mA cm⁻²) values. As a proof‐of‐concept, an SAEED was developed that contains a thermoelectric generator, Cu₃Mo₂O₉ǁgraphene ASD, and a beaker‐type electrolyzer operating at a voltage of 1.58 V to eliminate power loss and intermittent issues for sustainable and uninterrupted production of H₂.

Source: Small

DOI: 10.1002/smll.202504667