Abstract
Prussian blue analogs (PBA) and their derivatives show great application potentials in energy and environmental fields. However, the preparation of PBA and their derivatives on specific substrates are still far from practical use. Herein, we propose an innovative general and scalable strategy to grow PBA coatings on any conductive substrates including Ni, Co, stainless steel, Mo, W, Ti, Ta, Ni/carbon cloth (CC), and FTO with large sizes and high curvatures through spontaneous growth or electrodeposited seeds assisted epitaxial growth in solution. The potential difference between Fe3+/Fe2+ redox pair in the solution and metal ions/metal redox pair of the metal substrate may promote the release of metal ions from the substrate and induce the spontaneous growth. As a demonstration, PBA/Ni/CC samples prepared on Ni/CC substrates with this approach were transformed into nickel iron phosphides (NiFeP/CC) via a simple phosphidation process, which show excellent bifunctional electrocatalytic activities towards oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) due to the unique structures and desirable chemical compositions. It only requires very low overpotentials of 260 mV to achieve 200 mA cm−2 for OER and 129 mV to achieve 10 mA cm−2 for HER, respectively. Furthermore, the NiFeP/CC|| NiFeP/CC couple requires a low cell voltage of 1.57 V to reach 10 mA cm−2 and shows an ultralong lifetime with no obvious degradation after electrolyzing for 300 h, which is much superior to many other reported electrocatalysts. This work provides a facile strategy for designing efficient bifunctional electrocatalysts derived from spontaneously grown PBAs.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.