Publication date: 10th November 2021
Electrochemical hydrogen evolution reaction is a sustainable and promising solution to store renewable electricity. For this purpose, highly stable and efficient electrocatalysts based of Earth-abundant and non-toxic materials are required to scale-up the water splitting process. Recently, many works have reported electrocatalysts based on metallic earth-abundant and cost-effective materials (Ni, Co, Mo, Fe, Cu) as promising alternatives to the state-of-the-art Pt catalysts for HER. In this talk, we present a facile and scalable synthetic route to produce copper sulphide (Cu2S) electrocatalysts that evolve hydrogen with Faradaic efficiencies over 99%. Our Cu2S electrodes exhibit current densities that increase with operation time, reaching a state-of-the-art performance close to 400 mA cm-2 after a month of continuous operation. Interestingly, these exceptionally stable and high-performing Cu2S electrodes decrease their charge transfer resistance with the operation time, shown by electrochemical impedance spectroscopy. The state-of-the-art facile to synthesise Cu2S electrodes presented herein are remarkably stable and efficient, which are crucial characteristics for the development of competitive electrodes for hydrogen evolution.
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