An interfacial electronic coupling, a crucial factor in optimizing the functionality of hybrid material, can be enhanced by unique bi-directional coordinative bonding of 2D metal oxide nanosheet with Prussian blue (PB) nanocrystal. A strong mutual interfacial bonding between monolayered 2D MnO2 nanosheet and PB nanocrystal can be achieved by remarkable coordination abilities of the surface-exposed oxide ions of MnO2 and the cyanide ligand of PB. Due to the enhanced interfacial electronic coupling, the PB−layered MnO2 nanohybrid shows excellent supercapacitor electrode performance with huge specific capacitance of 623 F g−1 at 5 mV s−1, i.e. the largest value among ever-reported PB-based electrodes, which is much superior to those of the pristine PB and PB−graphene homologue. In-situ micro-Raman analysis highlights the enhancement of the Faradaic redox process of PB lattice by strong interfacial coupling with MnO2 nanosheet. The present study underscores that the introduction of bi-directional coordinative bonding with 2D inorganic nanosheets allows to provide novel synthetic strategy to explore highly efficient energy-functional coordination-compound-based materials.
Bibliographical noteFunding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government ( MSIP ) (No. NRF-2020R1A2C3008671 ) and by the Korea government ( MSIT ) (No. NRF-2017R1A5A1015365 ). The experiments at PAL were supported in part by MOST and POSTECH .
All Science Journal Classification (ASJC) codes
- Renewable Energy, Sustainability and the Environment
- Materials Science(all)
- Electrical and Electronic Engineering