Chen Xianjie, Wang Jun, Chai Yongqiang, Zhang Zijian, Zhu Yongfa
Department of Chemistry, Tsinghua University, Beijing, 100084, P. R. China.
State Key Laboratory of Environmental-Friendly Energy Materials, School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang, 621010, China.
Adv Mater. 2021 Feb;33(7):e2007479. doi: 10.1002/adma.202007479. Epub 2021 Jan 14.
A graphitic carbon nitride/rGO/perylene diimide polymer (g-C N /rGO/PDIP) Z-scheme heterojunction is successfully constructed to realize high-flux charge transfer and efficient photocatalytic overall water splitting. A giant internal electric field in the Z-scheme junction is built, enabling the charge separation efficiency to be enhanced dramatically by 8.5 times. Thus, g-C N /rGO/PDIP presents an efficient and stable photocatalytic overall water splitting activity with H and O evolution rate of 15.80 and 7.80 µmol h , respectively, ≈12.1 times higher than g-C N nanosheets. Meanwhile, a notable quantum efficiency of 4.94% at 420 nm and solar-to-hydrogen energy-conversion efficiency of 0.30% are achieved, prominently surpassing many reported g-C N -based photocatalysts. Briefly, this work throws light on enhancing the internal electric field by interface control to dramatically improve the photocatalytic performance.
成功构建了一种石墨相氮化碳/还原氧化石墨烯/苝二酰亚胺聚合物（g-C₃N₄/rGO/PDIP）Z型异质结，以实现高通量电荷转移和高效光催化全解水。在Z型结中构建了一个巨大的内建电场，使电荷分离效率显著提高了8.5倍。因此，g-C₃N₄/rGO/PDIP呈现出高效且稳定的光催化全解水活性，析氢和析氧速率分别为15.80和7.80 μmol h⁻¹，约为g-C₃N₄纳米片的12.1倍。同时，在420 nm处实现了4.94%的显著量子效率和0.30%的太阳能-氢能转换效率，明显超过了许多已报道的基于g-C₃N₄的光催化剂。简而言之，这项工作为通过界面控制增强内建电场以显著提高光催化性能提供了思路。
