Hieratical ternary layered double hydroxide/graphitic carbon nitride heterostructures as visible-light photocatalysts for efficient reduction of CO2
Hieratical ternary layered double hydroxide/graphitic carbon nitride heterostructures as visible-light photocatalysts for efficient reduction of CO2
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DOI：
10.1016/j.colsurfa.2022.130249
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发表时间：
2022-09
期刊：
影响因子：
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通讯作者：
M. Raza;Hui-Jun Tian;Z. Shui;Liangliang Zhu;Meidan Que;Xi Chen
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作者：
M. Raza;Hui-Jun Tian;Z. Shui;Liangliang Zhu;Meidan Que;Xi Chen
开发和合成高效、稳定、低成本的光催化剂以减少全球范围内的能源和环境问题是CO2减排的最大挑战。在此，我们探讨了NiFeV层状双氢氧化物（LDH）纳米片，g-C3 N4，和NiFeV-LDH/g-C3 N4异质结构的光催化性能，将CO2转化为高附加值的燃料，如CO和CH 4。2D/2D分级花状结构创建了一个出色的异质系统，具有紧密的界面和显著暴露的催化活性位点，以显着提高捕光能力。各组分之间的电荷转移使光生载流子更容易分离，降低了它们的复合速率，增强了CO2的光还原。g-C3 N4与NiFeV-LDH的质量比对NiFeV-LDH/g-C3 N4异质结构的光催化活性有显著影响。当g-C3 N4与NiFeV-LDH的质量比为15%时，催化剂的CH 4产率最高（15.2 μmol h−1g−1），是纯NiFeV-LDH的4.04倍。CO的产率为13.05 µmol h−1g−1，是纯NiFeV-LDH的3.15倍。此外，在循环实验运行中，优化的NiFeV-LDH/g-C3 N4 -15%异质结构表现出显着的光稳定性，CO和CH 4的形成量没有明显的变化。XPS和HRTEM分析表明，复合材料具有较强的电子相互作用，促进了异质结构组分之间的电荷转移，从而显著提高了光催化还原CO2的性能.该研究为进一步提高LDH基异质结构的光催化性能提供了一条可行的途径，为进一步开发LDH基光催化剂用于CO2减排开辟了新的前景。
The development and synthesis of high-efficient, stable, and cost-effective photocatalysts to reduce both world-wide energy and environmental issues are the most significant challenge in CO2reduction. Herein, we explore the photocatalytic performance over NiFeV layered double hydroxide (LDH) nanosheets, g-C3N4,and NiFeV-LDH/g-C3N4heterostructures, which convert CO2into high value-added fuels, such as CO and CH4. The 2D/2D hierarchical flower-like structure created an outstanding heterosystem with close interfaces and prominently exposed catalytic active sites to dramatically improve light-harvesting ability. The charge transfer among the individual components made the separation of photogenerated charge carriers easier and lessened their recombination rate, enhancing the photoreduction of CO2. The ratio of g-C3N4to NiFeV-LDH in term of weight had a significant impact on the photocatalytic activity of the NiFeV-LDH/g-C3N4heterostructure. The photocatalyst generated the maximum yields of CH4(15.2 µmol h−1g−1) when the weight ratio of g-C3N4to NiFeV-LDHs was 15%, which was 4.04 times that of pure NiFeV-LDH. The yield of CO was 13.05 µmol h−1g−1, 3.15 times that of pure NiFeV-LDH. Furthermore, during cycling experimental runs, the optimized NiFeV-LDH/g-C3N4-15% heterostructure exhibited a remarkable photostability with no discernible change in the amounts of CO and CH4formation. The significantly improved photocatalytic performance towards CO2reduction was confirmed by the XPS and HRTEM analyses, which showed strong electronic interactions and promoted charge transfer between heterostructure components. The current study provides a feasible way to enhance the photocatalytic performance of LDH-based heterostructures and opens up new prospects for developing LDH-based photocatalysts towards CO2reduction.