Ferroelectric-field accelerated charge transfer in 2D CuInP₂S₆ heterostructure for enhanced photocatalytic H₂ evolution

• Main Authors: Lin, Bo, Chaturvedi, Apoorva, Di, Jun, You, Lu, Lai, Chen, Duan, Ruihuan, Zhou, Jiadong, Xu, Baorong, Chen, Zihao, Song, Pin, Peng, Juan, Ma, Bowen, Liu, Haishi, Meng, Peng, Yang, Guidong, Zhang, Hua, Liu, Zheng, Liu, Fucai
• Other Authors: School of Materials Science and Engineering
• Format: Article
• Language: English
• Published: 2022
• Subjects: Engineering::Materials; 2D CuInP₂S₆; Ferroelectric
• Online Access: https://hdl.handle.net/10356/154721
• Institution: Nanyang Technological University

The development of ferroelectric photocatalytic materials with polarization electric field is a key approach to realize the spatial separation and fast transfer of charge carriers in visible-light-driven H2 evolution. Generally, replacing traditional 3D perovskite-type ferroelectric materials with 2D ferroelectric materials is disregarded as candidates for photocatalysis. Herein a 2D CuInP2S6 (CIPS) with room-temperature ferroelectricity (a Curie temperature of around 47 °C) is developed as a new photocatalyst, and 2D/2D heterojunction of CuInP2S6 nanosheet/g-C3N4 ultrathin flake (CIPS/CN) is constructed to further accelerate charge transfer. Benefitting from the synergetic action of the inner polarization electric field of CIPS and 2D/2D heterojunction, CIPS/CN displays a substantially accelerated charge transfer and significantly enhanced photocatalytic H2 evolution rate, which is up to 7.6 times by contrast with that of paraelectric-phase CIPS. This work would provide a new platform for the design of 2D ferroelectric photocatalytic system with highly-efficient charge transfer.