K原子掺杂高度面间结晶的g-C3N4光催化剂及其高效H2O2光合成
Simultaneously Improving Inter-Plane Crystallization and Incorporating K Atoms in g-C3N4 Photocatalyst for Highly-Efficient H2O2 Photosynthesis
摘要
Abstract
Graphitic carbon nitride(g-C3N4)has gained growing attention in hydrogen peroxide(H2O2)photosynthesis,but the low activity of two-electron oxygen reduction reaction(2e--ORR)still restricts its photocatalytic H2O2-generation performance.Herein,traditional g-C3N4 photocatalysts are recrystallized on KI crystal surfaces by a secondary calcination route to synthesize K incorporated highly-crystalline g-C3N4 photocatalysts.The synthesized CN-K photocatalyst exhibits improved inter-plane crystallization,narrowed bandgap structure,and smaller particle size from 20 to 50 nm.Moreover,the incorporated K atoms,as excellent catalytic sites,can enhance O2 adsorption and stabilize the*OOH intermediates,thus improving the 2e--ORR activity of the K incorporated high-crystallization g-C3N4 photocatalysts.Consequently,the optimized CN-K(1:6)photocatalyst exhibits a remarkably improved H2O2-generation rate of 7.8 mmol·L-1·h-1 with an AQE value of 5.17%at 420 nm,outperforming the traditional g-C3N4 sample by a factor of 220.This work uncovers the roles of heteroatoms in promoting the 2e--ORR selectivity of the g-C3N4 photocatalyst,and offers novel insights to construct highly-active g-C3N4-based materials for H2O2 photosynthesis.关键词
光催化产H2O2/氮化碳/钾掺杂/高选择性两电子氧还原Key words
Photocatalytic H2O2 evolution/Carbon nitride/K incorporation/Highly-selective 2e--ORR分类
化学化工引用本文复制引用
钟威,郑丹,欧远新,孟爱云,苏耀荣..K原子掺杂高度面间结晶的g-C3N4光催化剂及其高效H2O2光合成[J].物理化学学报,2024,40(11):37-38,2.基金项目
This work was supported by the National Natural Science Foundation of China(22178224,22272110),Guangdong Basic and Applied Basic Research Foundation(2023A1515110535,2020A1515110873),Shenzhen Science and Technology Program(RCBS20231211090522041),the Fundamental Research Funds for Shenzhen Technology University(20211063010047),Shenzhen Key Laboratory of Applied Technologies of Super-Diamond and Functional Crystals(ZDSYS20230626091303007),Shenzhen Science and Technology Program(20231127203830001). 国家自然科学基金项目(22178224,22272110) （22178224,22272110）
广东省基础与应用基础研究基金(2023A1515110535,2020A1515110873) （2023A1515110535,2020A1515110873）
深圳市科技计划资助(RCBS20231211090522041) （RCBS20231211090522041）
深圳技术大学基础科研业务费(20211063010047) （20211063010047）
深圳市超金刚石与功能晶体应用技术重点实验室(ZDSYS20230626091303007) （ZDSYS20230626091303007）
深圳市高校稳定支持项目(20231127203830001) （20231127203830001）
