The Journal of Chemical Physics, Journal Year: 2024, Volume and Issue: 161(8)

Published: Aug. 22, 2024

Transition-metal selenides have been extensively studied as promising electrode materials for supercapacitors. Engineering amorphous/crystalline heterostructures is an effective strategy to improve rich active sites accelerating redox reaction kinetics but still lacks exploration. In this study, heterostructure was designed and constructed by selenizing the self-sacrificial template NiMnS generate amorphous Mn/polycrystalline Ni0.85Se–NiSe2 heterophase via phase transformation from metal sulfide into selenide. The synergy of complementary multi-components amorphous/polycrystalline could enrich electron/ion-transport channels expose abundant sites, which accelerated electron/ion transfer Faradaic during charging/discharging. As expected, optimal NiMnSe exhibited a high specific charge (1389.1 C g−1 at 1 A g−1), good rate capability, excellent lifespan (88.9% retention). Moreover, fabricated NiMnSe//activated carbon device achieved long cycle life energy density 48.0 W h kg−1 800 kg−1, shedding light on potential use in practical applications, such electrochemical energy-storage devices.

Language: Английский