Viologen doping induced charge storage in carbon nitride for enhanced photocatalytic hydrogen production†

IF 6.1 1区 化学 Q1 CHEMISTRY, INORGANIC & NUCLEAR
Fankai Bu, Runzhi Yuan, Zejun Zhang, Jun Wang, Junying Liu and Yang-Chun Yong
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引用次数: 0

Abstract

The rapid recombination of photogenerated charges is the primary bottleneck hindering photocatalytic hydrogen generation with graphitic carbon nitride (g-C3N4). Herein, by introducing methyl viologen (MV) into the carbon nitride framework, CN-MV-x with enhanced photoinduced charge carrier separation is fabricated. The surface chemistry and photoelectrochemical properties of CN-MV-x samples are greatly enhanced. Owing to the increased charge separation with electron extraction by doped MV, the highest hydrogen evolution rate of 1.65 mmol g−1 h−1 is achieved by the CN-MV-x photocatalyst doped with 10 mmol MV (CN-MV-10). More impressively, CN-MV-10 also shows an extraordinary electron storage ability, which powers time-delayed hydrogen production in the dark after light illumination. Further analysis indicates that this time-delayed hydrogen evolution ability is ascribed to electron accumulation in the conduction band of carbon nitride. This study provides a new route to improve photoinduced charge separation by introducing redox species.

Abstract Image

紫素掺杂诱导氮化碳电荷存储增强光催化制氢
光生电荷的快速重组是阻碍石墨氮化碳(g-C3N4)光催化制氢的主要瓶颈。本文通过在氮化碳骨架中引入甲基紫素(MV),制备了具有增强光诱导载流子分离的CN-MV-x。CN-MV-x样品的表面化学和光电化学性能得到了极大的提高。掺10 mmol MV (CN-MV-10)的CN-MV-x光催化剂的析氢速率最高,为1.65 mmol/g/h。更令人印象深刻的是,CN-MV-10还显示出非凡的电子存储能力,可以在光照后的黑暗中为延时的氢气生产提供动力。进一步分析表明,这种时间延迟的析氢能力归因于氮化碳导带中的电子积累。本研究为引入氧化还原物质改善光诱导电荷分离提供了一条新途径。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Inorganic Chemistry Frontiers
Inorganic Chemistry Frontiers CHEMISTRY, INORGANIC & NUCLEAR-
CiteScore
10.40
自引率
7.10%
发文量
587
审稿时长
1.2 months
期刊介绍: The international, high quality journal for interdisciplinary research between inorganic chemistry and related subjects
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