Artificially regulating the crystallinity for constructing poly(heptazine imide)-based S-scheme homojunction with boosted photocatalytic hydrogen evolution performance

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外文摘要：Fabricating homojunction photocatalyst is a promising approach to accelerate the separation and transfer of photogenerated charge carriers,and to boost photocatalytic performance.Herein,a novel poly(hep-tazine imide)(PHI)-based S-scheme homojunction photocatalyst(U/T-LHPHI)is fabricated through an ionothermal synthesis route,which exhibits particular high and low crystallinity property,intimate in-terface combination,and locally N self-doping.The regulation of crystallinity contributes to the differen-tiated electronic structure in PHI,which leads to the establishment of internal electric field(IEF).The in-tense IEF and N doping level with electron extracting capacity synergistically promote the charge transfer from the high crystalline PHI(HPHI)to the low crystalline PHI(LPHI)following the S-scheme mecha-nism.Additionally,the strong interfacial interaction improves the interfacial charge transfer dynamics.As a consequence,photogenerated electrons with powerful reducing ability are maintained effectively.Upon light irradiation,the optimized U/T-LHPHI performs an H2 evolution rate of 4880,2416,and 2375 μmol g-1 h-1 in deionized water,simulated seawater,and real seawater,respectively,which exceed that of many carefully designed noble metal Pt containing photocatalyst.This work provides an important verifi-cation that the rational design and construction of homojunction photocatalysts could effectively enhance photocatalytic activity.

外文关键词：

PHIHomojunction constructionPhotocatalystH2 productionS-scheme

作者：

Xuehua Wang、Tianyu Shi、Jinfeng Cui、Guicun Li、Lei Wang、Jianfeng Huang、Alan Meng、Zhenjiang Li

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作者单位：

College of Materials Science and Engineering,Qingdao University of Science and Technology,Qingdao 266042,China

Qingdao Huanghai University,Qingdao 266000,China

Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science,MOE,College of Chemistry and Molecular Engineering,Qingdao University of Science and Technology,Qingdao 266042,China

School of Material Science and Engineering,International S&T Cooperation Foundation of Shaanxi Province,Xi'an Key Laboratory of Green Manufacture of Ceramic Materials,Shaanxi University of Science and Technology,Xi'an 710021,China

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基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaMajor Basic Research Program of Natural Science Foundation of Shandong ProvinceNatural Science Foundation of Shandong ProvinceNatural Science Foundation of Shandong ProvinceNatural Science Foundation of Shandong ProvinceChina Postdoctoral science Foundation

项目编号：

520721965200220052102106522022622237908122379080ZR2020ZD09ZR2020QE063ZR202108180009ZR2023QE0592023M741871

出版年：

2024

DOI：

10.1016/j.jmst.2024.02.024

材料科学技术(英文版)

中国金属学会中国材料研究学会中国科学院金属研究所

材料科学技术(英文版)

CSTPCD

影响因子：0.657

ISSN：1005-0302

年,卷(期)：2024.196(29)