Abstract
Developing highly active, stable, and efficient electrocatalysts for overall water splitting (OWS) is imperative to produce hydrogen with high purity. Herein, a series of Ni@Ru core-shell nanoparticles on flower-like carbon nanosheets (denoted as Ni@Ru/CNS-x, where x is the initial Ru mass loading percentage, and x = 5%, 10%, 15%) were fabricated through a facile wet chemical strategy by employing a metal-organic framework (MOF) as a sacrificial precursor. The Ni@Ru/CNS-x series was investigated to catalyze hydrogen evolution reaction (HER) in all-pH-value solutions, oxygen evolution reaction (OER) and water electrolysis in alkaline media. Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) analysis revealed the Ni@Ru/CNS-x presented a three-dimensional (3D) flower-like structure composed of nanosheets with a thickness of approximately 30 nm. The resultant catalysts exhibited excellent HER, OER and OWS performance in 1.0 M KOH. Ni@Ru/CNS-10% displayed the most outstanding electrocatalytic properties, evidenced by a low overpotential of 20.1 mV and 356 mV @ 10 mA cm−2 for HER and OER in 1.0 M KOH, and outperformed stability than Pt/C and RuO2 for HER and OER, respectively. Moreover, it exhibited a potential of 1.612 V @10 mA cm−2 in the practical OWS test, superior to both Pt/C and RuO2 catalysts. The strategy can be extended for rational design and preparation of low cost, highly active and durable electrocatalyst with bifunctionalities for OWS and other renewable energy devices.
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.