卤化物
单层
纳米晶
钙钛矿(结构)
氮化碳
分解水
材料科学
氮化物
碳纤维
光催化
光催化分解水
纳米技术
化学工程
光化学
无机化学
化学
结晶学
催化作用
图层(电子)
有机化学
复合材料
复合数
工程类
作者
Devika Laishram,Sheng Zeng,Kazi Md. Rokibul Alam,Aarat P. Kalra,Kai Cui,Pawan Kumar,Rakesh Sharma,Karthik Shankar
标识
DOI:10.1016/j.apsusc.2022.153276
摘要
• Air-stable and water-stable halide perovskite photocatalysts. • Core-shell CsPbBr3@monolayer carbon nitride heterojunction. • Visible light harvesting photoanode for water-splitting. • CO2 reduction photocatalyst. • Unusual 30 nm redshift after wrapping CsPbBr3 QDs with CN nanosheets. Halide perovskites are exciting candidates for broad-spectrum photocatalysts but have the problem of ambient stability. Protective shells of oxides and polymers around halide perovskite nano- and micro-crystals provide a measure of chemical and photochemical resilience but the photocatalytic performance of perovskites is compromised due to low electron mobility in amorphous oxide or polymer shells and rapid charge carrier recombination on the surface. Herein an in situ surface passivation and stabilization of CsPbBr 3 nanocrystals was achieved using monolayered graphenic carbon nitride (CNM). Extensive characterization of carbon nitride protected CsPbBr 3 nanocrystals (CNMBr) indicated spherical CsPbBr 3 nanoparticles encased in a few nm thick g-C 3 N 4 sheets facilitating better charge separation via percolation/tunneling of charges on conductive 2D nanosheets. The CNMBr core-shell nanocrystals demonstrated enhanced photoelectrochemical water splitting performance and photocurrent reaching up to 1.55 mA cm −2 . The CNMBr catalyst was successfully deployed for CO 2 photoreduction giving carbon monoxide and methane as the reaction products.
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