Graphene Aerogel-Based NiAl-LDH/g-C3N4 With Ultratight Sheet-Sheet Heterojunction for Excellent Visible-Light Photocatalytic Activity of CO2 Reduction
Graphene Aerogel-Based NiAl-LDH/g-C3N4 With Ultratight Sheet-Sheet Heterojunction for Excellent Visible-Light Photocatalytic Activity of CO2 Reduction
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DOI：
10.1016/j.apcatb.2022.121065
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发表时间：
2022-01
期刊：
影响因子：
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通讯作者：
Mingjun Yang;Peng Wang;Youji Li;Senpei Tang;Xiao Lin;Haiyan Zhang;Ziqiang Zhu;Feitai Chen-
中科院分区：
文献类型：
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作者：
Mingjun Yang;Peng Wang;Youji Li;Senpei Tang;Xiao Lin;Haiyan Zhang;Ziqiang Zhu;Feitai Chen-
NiAl-LDH（NALDH）纳米片与g-C3N4（CN）纳米片紧密接触，形成超紧密的片-片异质结，并通过引入石墨烯气凝胶（GA）交织成网络框架。值得注意的是，NALDH/CN/GA-20在可见光照射下表现出显着的CO生成率为28.83 μmol·g−1·h−1，分别是纯NALDH和裸CN的24倍和16倍。此外，它远远超过了报道的传统CO2光催化还原效率。超紧密的片-片异质结不仅缩短了电荷传输距离，而且产生了丰富的活性位点和耦合大界面。独特的结构促进了光生载流子的传输和分离，并促进了有效的质量传输和光吸收。提出了基于II型光催化系统的多电子串联还原机制来解释CO2还原途径。这项工作为设计具有理想的二氧化碳减排性能的光催化剂提供了见解。
NiAl-LDH (NALDH) nanosheets were in intimate contact with g-C3N4(CN) nanosheets to form ultratight sheet-sheet heterojunctions, which interweaved into network framework with introduction of the graphene aerogel (GA). Notably, the NALDH/CN/GA-20 showed a remarkable CO production rate of 28.83 μmol·g−1·h−1under visible light irradiation, which was 24 and 16 times those of pure NALDH and bare CN, respectively. Furthermore, it was far exceeding the reported conventional CO2 photocatalytic reduction efficiency. The ultratight sheet-sheet heterojunctions not only shorten the charge transmission distance, but result 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. Multi electron series reduction mechanism based on type-II photocatalytic system was proposed to explain the CO2reduction pathway. This work provides insight for designing photocatalysts with ideal performance for CO2reduction.