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Tailoring the porosity of MOF-derived N-doped carbon electrocatalysts for highly efficient solar energy conversion

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Title
Tailoring the porosity of MOF-derived N-doped carbon electrocatalysts for highly efficient solar energy conversion
Author(s)
Jin Soo Kang; Jiho Kang; Dong Young Chung; Yoon Jun Son; Kim S.; Sungjun Kim; Jin Kim; Juwon Jeong; Lee M.J.; Heejong Shin; Subin Park; Yoo S.J.; Ko M.J.; Yoon J.; Yung-Eun Sung
Publication Date
2018-11
Journal
JOURNAL OF MATERIALS CHEMISTRY A, v.6, no.41, pp.20170 - 20183
Publisher
ROYAL SOC CHEMISTRY
Abstract
Metal-organic framework (MOF)-derived carbon materials have been widely used as catalysts for a variety of electrochemical energy applications, and thermally carbonized zinc-2-methylimidazole (ZIF-8) has shown particularly high performance owing to its microporous structure with a large surface area. However, in the presence of bulky chemical species, such as triiodide, in mesoscopic dye-sensitized solar cells (DSCs), the small pore size of carbonized ZIF-8 causes a significant limitation in mass transfer and consequentially results in a poor performance. To resolve this problem, we herein report a simple strategy to enlarge the pore sizes of ZIF-8-derived carbon by increasing the dwelling time of Zn in ZIF-8 during the thermal carbonization process. A thin and uniform polydopamine shell introduced on the surface of ZIF-8, with the aim of retarding the escape of vaporized Zn species, leads to a dramatic increase in pore sizes, from the micropore to mesopore range. The porosity-tailored carbonized ZIF-8 manifests an excellent electrocatalytic performance in triiodide reduction, and when it was applied as the counter electrode of DSCs, an energy conversion efficiency of up to 9.03% is achievable, which is not only superior to that of the Pt-based counterpart but also among the highest performances of DSCs employing carbonaceous electrocatalysts. (c) 2018 The Royal Society of Chemistry
URI
https://pr.ibs.re.kr/handle/8788114/5058
DOI
10.1039/c8ta07190j
ISSN
2050-7488
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > 1. Journal Papers (저널논문)
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