Z-scheme heterojunctions composed of 3D graphene aerogel/g-C3N4 nanosheets/porous ZnO nanospheres for the efficient photocatalytic reduction of CO2 with H2O under visible light irradiation
Z-scheme heterojunctions composed of 3D graphene aerogel/g-C3N4 nanosheets/porous ZnO nanospheres for the efficient photocatalytic reduction of CO2 with H2O under visible light irradiation
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DOI：
10.1016/j.jallcom.2022.165607
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发表时间：
2022-06-10
影响因子：
6.2
通讯作者：
Chen，Feitai
中科院分区：
文献类型：
--
作者：
Wang，Peng;Yang，Min;Chen，Feitai
本文采用一种简单的方法制备了由g-C3 N4（CN）和ZnO锚定在3D石墨烯气凝胶（GAs）上的Z型纳米片/多孔纳米球（NSP）异质结系统。结果表明，CN/ZnO/GA-7催化剂在可见光下的CO生成速率为33.87 μmol·g-1·h-1，分别是ZnO、g-C3 N4和CN/ZnO催化剂的25、21和3倍。此外，该速率远远超过了报道的常规CO2光催化还原效率。此外，CN/ZnO/GA表现出优异的稳定性和商业应用的潜力。这些NSP异质结提供了强的界面相互作用，并带来了丰富的活性位点和耦合大界面。这种独特的结构促进了光生载流子的传输和分离，有利于有效的质量传输和光吸收。此外，还提出了基于Z型光催化体系的多电子串联还原机理来解释该材料的CO2还原反应.综上所述，这项工作展示了一个有前途的光催化混合系统与3D气凝胶为基础的Z-计划NSP异质结的有效和稳定的CO2还原。
In this paper, a Z-scheme nanosheet/porous nanosphere (NSP) heterojunction system composed of g-C3N4(CN) and ZnO anchored on 3D graphene aerogels (GAs) was synthesized using a facile process. According to the results, the CN/ZnO/GA-7 showed a remarkable CO production rate of 33.87 μmol·g−1·h−1under visible light irradiation, 25, 21 and 3 times higher than those of ZnO, g-C3N4, and CN/ZnO, respectively. Furthermore, this rate far exceeded the reported conventional photocatalytic reduction efficiency of CO2. Moreover, the CN/ZnO/GA exhibited exceptional stability and potential for commercial applications. These NSP heterojunctions provided a strong interfacial interaction and brought about abundant active sites and coupling large interfaces. The unique structure promoted the transport and separation of photogenerated carriers and facilitated effective mass transport and light absorption. Additionally, a multi-electron series reduction mechanism based on Z-scheme photocatalytic system was proposed to explain the CO2reduction over this material. Taken together, this work demonstrated a promising photocatalytic hybrid system with 3D aerogel-based Z-scheme NSP heterojunctions for efficient and stable CO2reduction.