Enhanced stability of two-dimensional halide perovskites under an electric field for photocatalytic HI splitting
Journal of Materials Chemistry A, ISSN: 2050-7496, Vol: 11, Issue: 12, Page: 6311-6320
2023
- 3Citations
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Most Recent News
Researchers from Sungkyunkwan University Report New Studies and Findings in the Area of Photocatalytics (Enhanced Stability of Two-dimensional Halide Perovskites Under an Electric Field for Photocatalytic Hi Splitting)
2023 APR 11 (NewsRx) -- By a News Reporter-Staff News Editor at South Korea Daily Report -- Investigators discuss new findings in Nanotechnology - Photocatalytics.
Article Description
Halide perovskites (HPs) have been considered next-generation solar energy conversion materials since they have outstanding properties such as a long carrier lifetime and high light absorption coefficient. Nevertheless, the stability against humidity is a major obstacle to the application of HPs for solar energy conversion devices, for example, photocatalysts for HI splitting operating in an aqueous solution. Two-dimensional halide perovskites (2D HPs) have been suggested to overcome the vulnerable properties to humidity, in which large organic cations (i.e., spacer) bonded at their surface delay the penetration of HO into the octahedron layer of 2D HPs. However, they still lack thermodynamic stability against humidity. In this work, we show by first-principles calculation that an external electric field causes a 2D HP stable to humidity in both thermodynamic and kinetic aspects since the energy of surface-adsorbed HO is significantly lowered relative to intercalated HO in addition to the progressive increase of the migration energy barrier of HO with the external electric field. Further, the calculated band edge positions become suitable for photocatalytic HI splitting under the electric field. We suggest that 2D HPs exposed to an electric field are promising photocatalysts for HI splitting with humidity resistance as well as appropriate band edge position.
Bibliographic Details
Royal Society of Chemistry (RSC)
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