硼掺杂SiC的制备、表征及其可见光分解水产氢性能

引用本文: 董莉莉, 王英勇, 童希立, 靳国强, 郭向云. 硼掺杂SiC的制备、表征及其可见光分解水产氢性能[J]. 物理化学学报, 2014, 30(1): 135-140. doi: 10.3866/PKU.WHXB201311052 shu

Citation: DONG Li-Li, WANG Ying-Yong, TONG Xi-Li, JIN Guo-Qiang, GUO Xiang-Yun. Synthesis and Characterization of Boron-Doped SiC for Visible Light Driven Hydrogen Production[J]. Acta Physico-Chimica Sinica, 2014, 30(1): 135-140. doi: 10.3866/PKU.WHXB201311052 shu

硼掺杂SiC的制备、表征及其可见光分解水产氢性能

基金项目:
国家自然科学基金(21173251，21203233)，中国科学院山西煤炭化学研究所创新基金(Y1SC6R1991) (21173251，21203233)，中国科学院山西煤炭化学研究所创新基金(Y1SC6R1991)

煤转化国家重点实验室自主项目(2013BWZ006)资助 (2013BWZ006)

摘要:

采用原位碳热还原法制备了硼掺杂的β-SiC (B_xSiC)光催化剂，并考察了其可见光下光催化分解水制氢的性能. 利用X射线衍射仪、X射线光电子能谱、扫描电镜及紫外-可见吸收光谱等测试方法对所制备催化剂的晶型、形貌、表面性质及能带结构进行了表征. 分析结果表明，硼原子掺杂进入SiC 晶格并取代了Si 位点，在价带上方形成了浅受主能级，从而导致了带隙宽变窄. 浅受主能级作为空穴的捕获中心可抑制光生电子和空穴的复合. 因此，与SiC相比，硼掺杂SiC光催化剂在可见光下催化分解水产氢的活性大大提高. 当B/Si 的摩尔比为0.05时，硼掺杂SiC表现出最高的光催化产氢活性.

关键词:

β-SiC
/ 硼掺杂
/ 光催化
/ 产氢
/ 可见光

English

Synthesis and Characterization of Boron-Doped SiC for Visible Light Driven Hydrogen Production

1.
1 State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, P. R. China;
2 University of Chinese Academy of Sciences, Beijing 100049, P. R. China
Received Date: 22 August 2013
Available Online: 01 January 2014
Fund Project:
国家自然科学基金(21173251，21203233)，中国科学院山西煤炭化学研究所创新基金(Y1SC6R1991)

煤转化国家重点实验室自主项目(2013BWZ006)资助

Abstract:

Boron-doped β-SiC (B_xSiC) photocatalysts were prepared by in-situ carbothermal reduction, and their photocatalytic performances for H₂ evolution under visible light irradiation were investigated. The crystal structure, surface property, morphology, and band gap structure of the B_xSiC photocatalysts were studied using X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, and ultraviolet-visible absorption spectroscopy. The characterization results indicate that B atoms have doped into the SiC lattice and substituted Si sites, leading to the formation of a shallow acceptor level above the valence band of SiC, resulting in a narrowed band gap energy. The shallow acceptor level acts as a hole trap, preventing the recombination of photo-excited electrons and holes. Therefore, the photocatalytic H₂ evolution activity of B-doped SiC was greatly improved compared with that of SiC. The highest hydrogen evolution rate was obtained when the B/Si molar ratio was 0.05.

Key words:

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

硼掺杂SiC的制备、表征及其可见光分解水产氢性能

English

Synthesis and Characterization of Boron-Doped SiC for Visible Light Driven Hydrogen Production

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

硼掺杂SiC的制备、表征及其可见光分解水产氢性能

English

Synthesis and Characterization of Boron-Doped SiC for Visible Light Driven Hydrogen Production

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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