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|
| Type |
Poster Presentation |
| Area |
Environmental Energy |
| Room No. |
Event Hall |
| Time |
4월 20일 (금요일) 11:00~12:30 |
| Code |
ENVR.P-675 |
| Subject |
Harnessing low energy photons (635 nm) for the production of H2O2 using upconversion nanohybrid photocatalysts |
| Authors |
SUNG EUN SEO, oh seok kwon1,*
SCHOOL OF CIVIL AND ENVIRONMENT ENGINEERING, Yonsei University, Korea
1BNT research center, KRIBB, Korea
|
| Abstract |
In the past few decades there has been much effort to develop alternative methods to synthesize H2O2 because conventional anthraquinone-based and
electrochemical processes require dangerous hydrogen gas, toxic organic solvents, and high energy inputs. A photocatalytic H2O2 production, in contrast, is a
sustainable and eco-friendly process that ideally requires only water, dioxygen, and sunlight. However, the main challenge toward this goal has been the lack of
efficient photocatalyst materials that effectively reduce dioxygen to H2O2 with the maximum use of solar irradiation including low energy photons. Herein we
developed a ternary nanohybrid consisting of (1) a triplet–triplet annihilation (TTA) upconversion chromophore-containing silica nanocapsule; (2) low-bandgap
CdS photocatalysts; and (3) a graphene oxide nanodisk (GOND) as a co-catalyst for oxygen reduction. Using this ternary nanohybrid, we demonstrated an
upconversion of red (635 nm) to green (505 nm) light in the ambient aqueous phase and sub-bandgap activation of the CdS photocatalyst for the photosynthesis
of H2O2. The GOND selectively attached on CdS particles facilitated the production of H2O2 by retarding charge recombination and retarding CdS
photocorrosion. The proposed ternary nanohybrid can be presented as a model for the TTA-upconversion based photocatalytic system working under subbandgap
irradiation (utilizing low grade solar photons) and in an aqueous-phase environment. The solar H2O2 is not only a useful solar fuel but also a green
oxidant and disinfectant for water purification, which makes its applications diverse. |
| E-mail |
eun93618@kribb.re.kr |
|
121st General Meeting of the KCS