光催化
异质结
氢氧化物
能量转换效率
催化作用
材料科学
带隙
热液循环
光电子学
化学
无机化学
化学工程
生物化学
工程类
作者
Xiang-yin Ji,Rui‐tang Guo,Junying Tang,Yu-fang Miao,Zhidong Lin,Long-fei Hong,Ye Yuan,Zhengsheng Li,Weiguo Pan
出处
期刊:ACS applied energy materials
[American Chemical Society]
日期:2022-03-01
卷期号:5 (3): 2862-2872
被引量:21
标识
DOI:10.1021/acsaem.1c03538
摘要
The reduction of CO2 to hydrocarbons through photocatalysis is a promising way to realize “carbon-neutral”. Nevertheless, developing efficient photocatalysts to achieve high solar energy conversion efficiency and CO2 conversion efficiency is a challenge. Here, we constructed a defective Cu2–xS/Ni-Al-LDH heterojunction photocatalyst via a hydrothermal method. The designed Cu vacancies in Cu2–xS and multiband transition of layered double hydroxide (LDH) promised its efficient solar energy utilization, showing decent CO2 photoreduction performance in both the full-spectrum and near-infrared (NIR) regions. The optimized 15% Cu2–xS/LDH composite achieved CH4 and CO yields of 14.2 μmol/g/h (2.83 μmol/g/h in the NIR region) and 5.3 μmol/g/h (2.99 μmol/g/h in the NIR region), respectively. Furthermore, the corresponding apparent quantum efficiency (AQE) of a 15% Cu2–xS/LDH catalyst is 3.86% at 420 nm. Experimental and characterization results suggested that the enhanced CO2 photoreduction performance could be ascribed to the fabricated p–n heterojunction with a Z-scheme charge transfer route between Cu2–xS and LDH, which inhibited the electron–hole recombination and improved the reaction kinetic energy owing to a higher conduction potential. The fabricated binary catalytic system with the nonprecious metal Cu2–xS and LDH has great prospects for realizing cost-efficient CO2 photoreduction.
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