Tailoring the porosity of MOF-derived N-doped carbon electrocatalysts for highly efficient solar energy conversion
- Authors
- Kang, Jin Soo; Kang, Jiho; Chung, Dong Young; Son, Yoon Jun; Kim, Seoni; Kim, Sungjun; Kim, Jin; Jeong, Juwon; Lee, Myeong Jae; Shin, Heejong; Park, Subin; Yoo, Sung Jong; Ko, Min Jae; Yoon, Jeyong; Sung, Yung-Eun
- Issue Date
- Nov-2018
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- JOURNAL OF MATERIALS CHEMISTRY A, v.6, no.41, pp.20170 - 20183
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF MATERIALS CHEMISTRY A
- Volume
- 6
- Number
- 41
- Start Page
- 20170
- End Page
- 20183
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/149070
- DOI
- 10.1039/c8ta07190j
- ISSN
- 2050-7488
- 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.
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