Enhanced photocatalytic CO2 reduction via MXene synergism: constructing an efficient heterojunction structure of g-C3N4 /Nb2C /CsPbBr3

IF 23.2 2区 材料科学 Q1 MATERIALS SCIENCE, COMPOSITES
Shiding Zhang, Yuhua Wang, Gaber A. M. Mersal, A. Alhadhrami, Dalal A. Alshammari, Yitong Wang, Hassan Algadi, Haixiang Song
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Abstract

Slow charge kinetics and high activation energy seriously hinder the efficiency of photocatalytic CO2. Synergies are a commonly used strategy. Nevertheless, common synergies have been limited to improving catalytic results. Herein, we synthesize a novel nanocomposite ternary heterojunction material, which forms a low interlayer electrostatic potential within the heterojunction through the MXene synergistic. A strong internal electric field from the outside to the inside is formed within the series layer heterojunction, which provides the inner driving force for the effective spatial separation of photoinduced electron-hole pairs. Under visible-light irradiation, the ternary heterojunction exhibited a maximum CO production rate of 53.07 µmol g−1 h−1, surpassing the rates of pure g-C3N4, CsPbBr3 QDs, and the binary composite of g-C3N4/CsPbBr3 by approximately 8.4, 10, and 2 times, respectively. Experimental results and theoretical analysis reveal the significance of 2D Nb2C MXene as an electron transporter, benefiting from lower electrostatic potential. This characteristic synergistically facilitated the rapid extraction of photoinduced electrons, enhancing the reduction ability of CO2 to CO. This research not only provides a novel insight into MXene utilization for designing ternary heterojunction nanocomposite photocatalysts but also presents the potential of utilizing synergism ternary composites to improve solar energy conversion efficiency.

Graphical abstract

通过 MXene 协同作用增强光催化二氧化碳还原:构建 g-C3N4 /Nb2C /CsPbBr3 的高效异质结结构
缓慢的充电动力学和高活化能严重阻碍了光催化二氧化碳的效率。协同作用是一种常用的策略。然而,普通的协同作用仅限于改善催化效果。在此,我们合成了一种新型纳米复合三元异质结材料,通过 MXene 协同作用在异质结内形成低层间静电势。串联层异质结内部形成了由外向内的强内电场,为光诱导电子-空穴对的有效空间分离提供了内在驱动力。在可见光照射下,三元异质结的 CO 生成率最高可达 53.07 µmol g-1 h-1,分别比纯 g-C3N4、CsPbBr3 QDs 和 g-C3N4/CsPbBr3 的二元复合材料高出约 8.4 倍、10 倍和 2 倍。实验结果和理论分析表明,二维 Nb2C MXene 具有较低的静电势,是一种重要的电子传递器。这一特性协同促进了光诱导电子的快速提取,增强了将 CO2 还原成 CO 的能力。这项研究不仅为利用 MXene 设计三元异质结纳米复合光催化剂提供了新的视角,还展示了利用三元复合材料的协同作用提高太阳能转换效率的潜力。
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来源期刊
CiteScore
26.00
自引率
21.40%
发文量
185
期刊介绍: Advanced Composites and Hybrid Materials is a leading international journal that promotes interdisciplinary collaboration among materials scientists, engineers, chemists, biologists, and physicists working on composites, including nanocomposites. Our aim is to facilitate rapid scientific communication in this field. The journal publishes high-quality research on various aspects of composite materials, including materials design, surface and interface science/engineering, manufacturing, structure control, property design, device fabrication, and other applications. We also welcome simulation and modeling studies that are relevant to composites. Additionally, papers focusing on the relationship between fillers and the matrix are of particular interest. Our scope includes polymer, metal, and ceramic matrices, with a special emphasis on reviews and meta-analyses related to materials selection. We cover a wide range of topics, including transport properties, strategies for controlling interfaces and composition distribution, bottom-up assembly of nanocomposites, highly porous and high-density composites, electronic structure design, materials synergisms, and thermoelectric materials. Advanced Composites and Hybrid Materials follows a rigorous single-blind peer-review process to ensure the quality and integrity of the published work.
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