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

Title
Tailoring the porosity of MOF-derived N-doped carbon electrocatalysts for highly efficient solar energy conversion
Author
고민재
Keywords
METAL-ORGANIC FRAMEWORKS; COUNTER-ELECTRODE CATALYST; NANOPOROUS CARBONS; MESOPOROUS CARBON; TRIIODIDE REDUCTION; POROUS CARBON; ACTIVE-SITES; LOW-COST; CELLS; NANOPARTICLES
Issue Date
2018-11
Publisher
ROYAL SOC CHEMISTRY
Citation
JOURNAL OF MATERIALS CHEMISTRY A, v. 6, no. 41, page. 20170-20183
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.
URI
https://pubs.rsc.org/en/content/articlelanding/2018/TA/C8TA07190J#!divAbstracthttp://repository.hanyang.ac.kr/handle/20.500.11754/120643
ISSN
2050-7488; 2050-7496
DOI
10.1039/c8ta07190j
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > CHEMICAL ENGINEERING(화학공학과) > Articles
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