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Vacancy mediated Z-scheme charge transfer in a 2D/2D La2Ti2O7/g-C3N4 nanojunction as a bifunctional photocatalyst for solar-to-energy conversion
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2020-06-09 , DOI: 10.1039/d0ta01310b Kai Wang 1, 2, 3, 4, 5 , Lisha Jiang 1, 2, 3, 4, 5 , Xiaoyong Wu 1, 2, 3, 4, 5 , Gaoke Zhang 1, 2, 3, 4, 5
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2020-06-09 , DOI: 10.1039/d0ta01310b Kai Wang 1, 2, 3, 4, 5 , Lisha Jiang 1, 2, 3, 4, 5 , Xiaoyong Wu 1, 2, 3, 4, 5 , Gaoke Zhang 1, 2, 3, 4, 5
Affiliation
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The rational design of low-dimensional heterostructures with defects is a effective way to tackle the sophisticated challenge of harvesting solar energy to generate clean fuels such as H2 and C1 products. Herein, we designed 2D/2D La2Ti2O7/g-C3N4 nanocomposites with abundant oxygen vacancies as an efficient visible light-driven bifunctional photocatalyst for H2 evolution and CO2 reduction reactions. Through both experimental and DFT study, a defined oxygen vacancy in La2Ti2O7 was confirmed. The oxygen vacancy mediated Z-scheme mechanism verified by ESR analysis plays a significant role in the generation of clean fuels, leading to H2, CH3OH and CO generation with a much higher yield than that of defective La2Ti2O7 and g-C3N4 alone. These 2D/2D nanojunction induces a rapid electron injection from the defect sites of La2Ti2O7 nanosheets to g-C3N4 nanosheets and prolong the charge carriers' lifetime, thereby leading to high reducing power for clean fuel generation.
中文翻译：
空位介导的Z方案电荷转移在2D / 2D La2Ti2O7 / g-C3N4纳米结中作为双功能光催化剂进行太阳能转化
合理设计具有缺陷的低维异质结构是解决收集太阳能以产生H 2和C1产品等清洁燃料这一复杂挑战的有效方法。在本文中，我们设计了具有丰富氧空位的2D / 2D La 2 Ti 2 O 7 / gC 3 N 4纳米复合材料，作为一种有效的可见光驱动的双功能光催化剂，用于H 2析出和CO 2还原反应。通过实验和DFT研究，确定了La 2 Ti 2 O 7中确定的氧空位已经被证实。通过ESR分析验证的氧空位介导的Z方案机理在清洁燃料的产生中起着重要作用，从而导致H 2，CH 3 OH和CO的产生比缺陷La 2 Ti 2 O 7和La 2 Ti的产生要高得多。单独的gC 3 N 4。这些2D / 2D纳米结诱导了从La 2 Ti 2 O 7纳米片的缺陷部位向gC 3 N 4纳米片的快速电子注入，并延长了载流子的寿命，从而为清洁燃料的产生带来了高还原力。
更新日期：2020-07-07
中文翻译：
空位介导的Z方案电荷转移在2D / 2D La2Ti2O7 / g-C3N4纳米结中作为双功能光催化剂进行太阳能转化
合理设计具有缺陷的低维异质结构是解决收集太阳能以产生H 2和C1产品等清洁燃料这一复杂挑战的有效方法。在本文中，我们设计了具有丰富氧空位的2D / 2D La 2 Ti 2 O 7 / gC 3 N 4纳米复合材料，作为一种有效的可见光驱动的双功能光催化剂，用于H 2析出和CO 2还原反应。通过实验和DFT研究，确定了La 2 Ti 2 O 7中确定的氧空位已经被证实。通过ESR分析验证的氧空位介导的Z方案机理在清洁燃料的产生中起着重要作用，从而导致H 2，CH 3 OH和CO的产生比缺陷La 2 Ti 2 O 7和La 2 Ti的产生要高得多。单独的gC 3 N 4。这些2D / 2D纳米结诱导了从La 2 Ti 2 O 7纳米片的缺陷部位向gC 3 N 4纳米片的快速电子注入，并延长了载流子的寿命，从而为清洁燃料的产生带来了高还原力。
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