Synergies between Unsaturated Zn/Cu Doping Sites in Carbon Dots Provide New Pathways for Photocatalytic Oxidation

Wu, Wenting; Zhang, Qinggang; Wang, Ruiqin; Zhao, Yufei; Li, Zhongtao; Ning, Hui; Zhao, Qingshan; Wiederrecht, Gary P.; Qiu, Jieshan; Wu, Mingbo

doi:10.1021/acscatal.7b03423

Title: Synergies between Unsaturated Zn/Cu Doping Sites in Carbon Dots Provide New Pathways for Photocatalytic Oxidation

Journal Article · Thu Dec 07 00:00:00 EST 2017 · ACS Catalysis

DOI:https://doi.org/10.1021/acscatal.7b03423· OSTI ID:1426233

^[1]; Zhang, Qinggang ^[2]; Wang, Ruiqin ^[2]; Zhao, Yufei ^[3]; Li, Zhongtao ^[2]; Ning, Hui ^[2]; Zhao, Qingshan ^[2]; Wiederrecht, Gary P. ^[4];

^[5];

^[2]

China Univ. of Petroleum, Qingdao (China). State Key Lab. of Heavy Oil Processing, College of Chemical Engineering; Argonne National Lab. (ANL), Argonne, IL (United States). Center for Nanoscale Materials
China Univ. of Petroleum, Qingdao (China). State Key Lab. of Heavy Oil Processing, College of Chemical Engineering
Chinese Academy of Sciences, Beijing (China). Key Lab. of Photochemical Conversion and Optoelectronic Materials, Technical Inst. of Physics and Chemistry
Argonne National Lab. (ANL), Argonne, IL (United States). Center for Nanoscale Materials
Dalian Univ. of Technology, Dalian (China). State Key Lab. of Fine Chemicals, School of Chemical Engineering

Unsaturated metal species (UMS) confined in nanomaterials play important roles for electron transfer in a wide range of catalytic reactions. However, the limited fabrication methods of UMS restrict their wider catalytic applications. Here in this paper, we report on the synergy of unsaturated Zn and Cu dopants confined in carbon dots (ZnCu-CDs) to produce enhanced electron transfer and photooxidation processes in the doped CDs. The Zn/Cu species chelate with the carbon matrix mainly through Cu-O(N)-Zn-O(N)-Cu complexes. Within this structure, Cu²⁺ acts as a mild oxidizer that facilely increases the unsaturated Zn content and also precisely tunes the unsaturated Zn valence state to Zn^d+, where d is between 1 and 2, instead of Zn. With the help of UMS, electron-transfer pathways are produced, enhancing both the electron donating (7.0 times) and-accepting (5.3 times) abilities relative to conventional CDs. Because of these synergistic effects, the photocatalytic efficiency of CDs in photooxidation reactions is shown to improve more than 5-fold.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NSFC); China Scholarship Council; China Postdoctoral Science Foundation; Shandong Provincial Natural Science Foundation

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1426233

Journal Information:: ACS Catalysis, Vol. 8, Issue 2; ISSN 2155-5435

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 48 works

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77 NANOSCIENCE AND NANOTECHNOLOGY
carbon dots
electron transfer
photooxidation
superoxide radical anion
unsaturated Zn/Cu species

Title: Synergies between Unsaturated Zn/Cu Doping Sites in Carbon Dots Provide New Pathways for Photocatalytic Oxidation

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