https://scholar.dgist.ac.kr/handle/20.500.11750/1124 Sat, 04 Apr 2026 10:33:22 GMT 2026-04-04T10:33:22Z https://scholar.dgist.ac.kr/handle/20.500.11750/46292 Title: CHAPTER 5. Photoexcitation in Pure and Modified Semiconductor Photocatalysts Author(s): Kim, Gon U; Park, Yiseul; Moon, Gun-hee; Choi, Wonyong Abstract: Semiconductor photocatalysis has great promise for applications in solar energy conversion and environmental remediation because it is inexpensive, versatile, and environmentally benign. However, some critical factors such as limited light absorption and fast electron-hole pair recombination restrict the practical applications. Because no pure-phase semiconductors efficiently utilize solar irradiation, semiconductor materials have been modified in various ways to enhance their light-absorption properties. In this chapter, photoexcitation in modified semiconductor systems that include the impurity-doped, coupled, dye-sensitized, ligand-to-metal charge transfer (LMCT)-sensitized, and local surface plasmon resonance (LSPR)-sensitized semiconductors are discussed. In particular, the photoexcitation mechanism, charge transfer pathway, applications, and limitations of each method are described. © 2016 The Royal Society of Chemistry. Mon, 29 Feb 2016 15:00:00 GMT https://scholar.dgist.ac.kr/handle/20.500.11750/46292 2016-02-29T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/45948 Title: 광전극 소재를 중심으로 본 광전기화학적 이산화탄소 전환기술 동향 분석 Author(s): 박이슬; 최지나 Abstract: This work is a short review of recent studies on photoelectrochemical reduction of carbon dioxide (CO2). Photoelectrochemical reduction of CO2 is a light-driven CO2 reduction, which harnesses solar energy to convert CO2 into higher-energy products (e.g., liquid fuels). Studies on photoelectrochemical cell have mainly focused on photoelectrochemical H2 production via water splitting, but, recently, photoelectrochemical reduction of CO2 have been actively investigated as a part of the artificial photosynthesis studies. In this short review, the recent literature on photoelectrochemical reductions of CO2 is reviewed. Various photoanode and photocathode materials are compared and different approaches to enhancing solar-to-fuel efficiency and selectivity of target product are described. Tue, 31 May 2016 15:00:00 GMT https://scholar.dgist.ac.kr/handle/20.500.11750/45948 2016-05-31T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/10113 Title: 태양광 물분해를 위한 BiVO4 기반의 광전극 개발 연구 동향 Author(s): 박이슬 Thu, 31 Jul 2014 15:00:00 GMT https://scholar.dgist.ac.kr/handle/20.500.11750/10113 2014-07-31T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/10076 Title: Performance enhancement of triboelectric nanogenerators based on polyvinylidene fluoride/graphene quantum dot composite nanofibers Author(s): Choi, Geon-Ju; Baek, Seong-Ho; Lee, Sang-Seok; Khan, Firoz; Kim, Jae Hyeon; Park, Il-Kyu Abstract: Wearable mechanical energy harvesting technologies have been achieved much attention for the wireless sustainable power source applications. In this study, we have fabricated polyvinylidene fluoride (PVDF)/graphene quantum dot (GQD) composite nanofibers (NFs), which showed improved triboelectric nanogenerator (TENG) performance. PVDF/GQD composite NFs were fabricated by an electrospinning method. Structural and chemical investigations show that the GQDs were embedded in the PVDF NFs and promoted the formation of polar β-phase when an optimal amount of GQDs was incorporated. The PVDF/GQD NFs showed strong photoluminescence at a wavelength of 453 nm, which was attributed to the electronic transitions in the GQDs. As the GQD content increased from 0 to 5 vol%, the maximum output power from TENG devices increased from 35 to 97 μW but decreased with further additions of GQDs. The enhancement and degradation of the TENG performance with increasing the GQD contents were due to the enhanced formation of polar β-phase and the detrimental effect of conductive GQDs for charge trapping, respectively. © 2019 Elsevier B.V. Wed, 31 Jul 2019 15:00:00 GMT https://scholar.dgist.ac.kr/handle/20.500.11750/10076 2019-07-31T15:00:00Z