摘要
可见光响应型二维复合半导体材料是光催化领域研究的重要内容,构建稳定有效的异质结以促进界面电荷传输是二维复合材料研究的关键。将氮化碳纳米片(C_(3)N_(4))和SnO_(2)纳米片通过煅烧法设计合成面-面堆叠式2D-2D SnO_(2)/C_(3)N_(4)复合半导体。该复合材料保留稳定的C_(3)N_(4)和SnO_(2)的主体结构,同时在界面处形成稳定的异质结。光解水制氢(H2)和活化氧(O_(2))制过氧化氢(H_(2)O_(2))的性能测试结果表明,在可见光照射下,SnO_(2)纳米片含量为5wt%的复合样品SnO_(2)/C_(3)N_(4)-5%具有显著提升的制H_(2)活性(54.9µmol·h^(−1)),约是C_(3)N_(4)纳米片的2.1倍,且具有良好的活性稳定性;在无牺牲剂和助催化剂条件下,SnO_(2)/C_(3)N_(4)-5%活化O_(2)制H_(2)O_(2)的活性达78.9µmol·L^(−1)·h^(−1),约是C_(3)N_(4)纳米片的11.9倍。结构表征及电化学测试结果表明,异质结的建立有利于C_(3)N_(4)光生电子向SnO_(2)表面快速转移,抑制了激发电子空穴的复合率,从而大幅提升了光催化还原性能。
Visible-light responsive two-dimensional composite semiconductor materials are significant in the field of photocatalysis.Construction of stable and effective heterojunctions to promote interface charge transport is the key in the research of two-dimensional composite materials.In this work,a face-to-face stacked 2D-2D SnO_(2)/C_(3)N_(4) composite semiconductor was synthesized by calcining carbon nitride(C_(3)N_(4))nanosheets and SnO_(2) nanosheets.The main structure of C_(3)N_(4) and SnO_(2) well stably retained and a stable heterojunction at the interface of them was formed.Photocatalytic test results of water splitting for hydrogen(H2)evolution and active oxygen(O_(2))for hydrogen peroxide(H_(2)O_(2))generation show that under visible light irradiation,the composite sample of SnO_(2)/C_(3)N_(4)-5%while the content of SnO_(2) is 5wt%shows much enhanced H_(2) evolution activity(54.9µmol·h^(−1)),which is about 2.1 times as that of C_(3)N_(4) nanoseets.And the H2O_(2) generation activity of SnO_(2)/C_(3)N_(4)-5%is 78.9µmol·L^(−1)·h^(−1),which is about 11.9 times that of C_(3)N_(4) nanosheets.The structural characterization and electrochemical tests show that the establishment of heterojunction facilitate the rapid transfer of photogenerated electrons from C_(3)N_(4) to SnO_(2),inhibite the recombination rate of excited electrons-holes,and greatly improve the photocatalytic reduction performance.
作者
崔言娟
徐红赟
祝玉鑫
李雪
宋艳华
CUI Yanjuan;XU Hongyun;ZHU Yuxin;LI Xue;SONG Yanhua(School of Environmental and Chemical Engineering,Jiangsu University of Science and Technology,Zhenjiang 212100,China)
出处
《复合材料学报》
EI
CAS
CSCD
北大核心
2022年第8期3852-3862,共11页
Acta Materiae Compositae Sinica
基金
江苏省自然科学基金(BK20190981)
福州大学能源与环境光催化国家重点实验室开放课题(SKLPEE-KF202103)。
