铜原子调控氰胺氮化碳提高光催化CO2还原性能
Copper Atoms Regulate Cyanamide Carbon Nitride to Improve Photocatalytic CO2 Reduction Performance
毛倩宇 1毛翔宇 2李燕瑞1
作者信息
- 1. 西安科技大学材料科学与工程学院,陕西西安 710054
- 2. 河南省安阳市工业和信息化局,河南安阳 455000
- 折叠
摘要
铜原子调控氰胺功能氮化碳可有效解决g-C3N4光吸收范围有限、载流子-空穴复合率高等缺陷.通过KSCN熔融盐和g-C3N4热聚合的方法制备得到氰胺功能氮化碳(NCN-CNx),再通过水相合成法形成一系列NCN-Cu催化剂,利用气相色谱仪对催化剂的光催化性能进行了分析,并采用XRD、SEM、XPS、FT-IR、UV-Vis、PL、EIS和I-t等表征手段对催化剂的理化性质、热力学及动力学性能进行了评价.结果表明:铜原子通过氰基与碳氮聚合物相连可以显著提高光催化还原CO2的效率,1％NCN-Cu的CO产率是43.2μmol·g-1,CH4产率是22.3μmol·g-1,展现出最佳的光催化性能.
Abstract
Copper atom regulate cyanamide functional carbon nitride can effectively solve the defects of limited light absorption range and high carrier-hole recombination rate of g-C3N4. Cyanamide functionalized carbon nitride (NCN-CNx) was successfully synthesized by thermal polymerization of KSCN molten salt and g-C3N4, and then a series of NCN-Cu catalysts were synthesized by codeposition method. The properties of the catalysts were evaluated by gas chromatography. The physicochemical properties, thermodynamic and kinetic properties of the catalysts were analyzed by XRD, SEM, XPS, FT-IR, UV-Vis, PL, EIS and I-t. The results showed that photocatalytic CO2 reduction performance can be significantly improved by linking copper atoms to carbon-nitrogen polymers through cyano groups. Photocatalytic experiments showed that the yield of CO of 1％ NCN-Cu was 43.2 μmol·g-1, and the yield of CH4 was 22.3 μmol·g-1, showing the best photocatalytic performance.
关键词
熔融盐/二氧化碳/单原子/内建电场/催化剂Key words
Molten salt/CO2/Single atom/Built-in electric field/Catalyst引用本文复制引用
基金项目
国家自然科学基金项目(51961165103)
陕西省自然科学基础研究计划项目(2018JQ2028)
出版年
2024
NETL
NSTL
万方数据