Oxygen-Cluster-Modified Anatase with Graphene Leads to Efficient and Recyclable Photo-Catalytic Conversion of CO2 to CH4 Supported by the Positron Annihilation Study

被引：31

作者：

Ahmed, Gulzar ^{[1
,5
]}

Raziq, Fazal ^{[2
]}

Hanif, Muddasir ^{[1
,3
]}

Khan, Javid ^{[4
]}

Munawar, Khurram Shahzad ^{[5
]}

Wu, Mingmei ^{[4
]}

Cao, Xingzhong ^{[6
]}

Liu, Zhongwu ^{[1
]}

机构：

[1] South China Univ Technol, Sch Mat Sci & Engn, Guangzhou 510640, Guangdong, Peoples R China

[2] Univ Elect Sci & Technol China, Sch Phys, Chengdu 610054, Sichuan, Peoples R China

[3] South China Univ Technol, State Key Lab Luminescent Mat & Devices, Guangzhou 510640, Guangdong, Peoples R China

[4] Sun Yat Sen Univ, Sch Chem & Chem Engn, MOE Key Lab Bioinorgan & Synthet Chem, Guangzhou 510275, Guangdong, Peoples R China

[5] Univ Sargodha, Sub Campus Mianwali, Punjab 42200, Pakistan

[6] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China

来源：

SCIENTIFIC REPORTS | 2019年 / 9卷 / 1期

基金：

中国国家自然科学基金;

关键词：

OXIDE NANOCOMPOSITES; TIO2; PERFORMANCE; PHOTOCATALYSIS; VACANCIES;

D O I：

10.1038/s41598-019-49694-w

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

AnataseTiO(2) hollow nanoboxes were synthesized and combined with the graphene oxide to get nanocomposite of TiO2/rGO (TG). Graphene oxide was used to modify the Oxygen-Clusters and bulk to surface defects. Anatase and TG composite were characterized with the positron annihilation, XPS, EPR, EIS and photocurrent response analysis. The relative affects of defects on the photocatalytic reduction (CO2 to CH4) were studied. The TG composites showed highest photo-catalytic activity after GO coupling (49 mu mol g(-1) h(-1)), 28.6 times higher photocurrent yields much higher quantum efficiency (3.17%@400 nm) when compared to the TiO2 nanoboxes. The mechanism of enhanced photo-catalytic CO2 conversion to CH4 elucidated through electrochemical and photo-catalytic experiments with traceable isotope containing carbon dioxide ((CO2)-C-13). For the first time we discovered that diminishing the comparative concentration ratio of anatase from the bulk to surface defects could significantly increase the conversion of CO2 to CH4.

引用

页数：8

共 32 条

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