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

Xuehua Wang ¹Tianyu Shi ¹Jinfeng Cui ²Guicun Li ¹Lei Wang ³Jianfeng Huang ⁴Alan Meng ³Zhenjiang Li¹

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作者信息

1. College of Materials Science and Engineering,Qingdao University of Science and Technology,Qingdao 266042,China
2. Qingdao Huanghai University,Qingdao 266000,China
3. 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
4. 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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Abstract

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.

Key words

PHI/Homojunction construction/Photocatalyst/H2 production/S-scheme

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基金项目

National Natural Science Foundation of China(52072196)

National Natural Science Foundation of China(52002200)

National Natural Science Foundation of China(52102106)

National Natural Science Foundation of China(52202262)

National Natural Science Foundation of China(22379081)

National Natural Science Foundation of China(22379080)

Major Basic Research Program of Natural Science Foundation of Shandong Province(ZR2020ZD09)

Natural Science Foundation of Shandong Province(ZR2020QE063)

Natural Science Foundation of Shandong Province(ZR202108180009)

Natural Science Foundation of Shandong Province(ZR2023QE059)

China Postdoctoral science Foundation(2023M741871)

出版年

2024

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

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