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首页> 外文期刊>Journal of Colloid and Interface Science >In-situ growth of TiO2 imbedded Ti(3)C(2)TA nanosheets to construct PCN/Ti3C2TA MXenes 2D/3D heterojunction for efficient solar driven photocatalytic CO2 reduction towards CO and CH4 production
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In-situ growth of TiO2 imbedded Ti(3)C(2)TA nanosheets to construct PCN/Ti3C2TA MXenes 2D/3D heterojunction for efficient solar driven photocatalytic CO2 reduction towards CO and CH4 production

机译：TiO2的原位生长嵌入式Ti（2）C（2）TA纳米片构成PCN / TI3C2TA MXENES 2D / 3D异质结，以实现高效的太阳驱动光催化二氧化碳减少升高CO和CH4生产

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Constructing efficient structured materials for artificial photosynthesis of CO2 is a promising strategy to produce renewable fuels in addition of mitigating greenhouse effect. In this work, 2D porous g-C3N4 (PCN) coupled exfoliated 3D Ti3C2TA MXene (TiC) nanosheets with TiO2 NPs in-situ growth was constructed in a single step through HF treatment approach. The different exfoliated TiC structures were successfully synthesized for adjusting HF etching time (24 h, 48 h and 96 h). With growing etchant time from 24 to 96 h, the amount of TiO2 produced was increased, but it has adverse effects on CO and CH4 production rate. The maximum production rates for CO and CH4 of 317.4 and 78.55 mu mol g(-1) h(-1) were attained when the 10TiC-48/PCN was employed than using TiC-24/PCN, TiC-96/PCN and PCN composite samples, respectively. The performance of 10TiC-48/PCN composite for CO and CH4 evolution were 9.9 and 6.7 folds higher than using pristine PCN sample, respectively. The possible mechanism is assigned to porous structure with intimate contact enabling efficient charge carrier separation with the role of TiO2 NPs to work as a bridge to transport electrons towards MXene surface. Among the reducing agents, water was favorable for CO evolution, whereas, methanol-water system promoted CH4 production. All these findings confirm that heterojunction formation facilitates charges separation and can be further used in solar energy relating application. (C) 2021 Elsevier Inc. All rights reserved.
机译：除了缓解温室效应外，构建高效的二氧化碳人工光合作用结构材料是生产可再生燃料的一个很有前景的策略。在这项工作中，通过HF处理方法一步制备了2D多孔g-C3N4（PCN）耦合剥落3D Ti3C2TA MXene（TiC）纳米片和TiO2 NP原位生长。通过调整HF刻蚀时间（24小时、48小时和96小时），成功合成了不同的剥落TiC结构。随着蚀刻时间从24小时增加到96小时，TiO2的生成量增加，但对CO和CH4的生成速率有不利影响。当使用10TiC-48/PCN时，CO和CH4的最大产率分别为317.4和78.55μmol g（-1）h（-1），而不是使用TiC-24/PCN、TiC-96/PCN和PCN复合样品。10TiC-48/PCN复合材料的CO和CH4析出性能分别比原始PCN样品高9.9倍和6.7倍。可能的机制被认为是具有紧密接触的多孔结构，能够有效地分离电荷载流子，而TiO2 NP的作用是充当桥梁，将电子传输到MXene表面。在还原剂中，水有利于CO的生成，而甲醇-水体系促进了CH4的生成。所有这些发现证实了异质结的形成有利于电荷分离，并可进一步用于太阳能相关应用。（c）2021爱思唯尔公司保留所有权利。

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