고등학생을 위한 광합성 탐구 활동 자료 개발

김미정 한국현장과학교육학회 2019 현장과학교육 Vol.13 No.1

In the high school curriculum, experiments that students can perform are not introduced when they are studying photosynthesis. This is because the experiments used to identify the mechanisms of photosynthesis are somewhat complicated and specialized. In this study, I modified the Hill Reaction experiment to clarify the Light-dependent reaction and developed educational materials to be implemented at the school site. In addition, It is included an introduction of artificial photosynthesis technology which applied the Hill Reaction experiment process. By using these educational materials, students can promote interest and scientific literacy by linking knowledge based on advanced science technology with knowledge learned in school and carrying out inquiry activities. 고등학교 교육과정에서 광합성을 학습할 때 학생들이 수행할 수 있는 광합성 관련 실험이 소개되고 있지 않다. 광합성의 기작을 밝히는 과정에 사용된 실험이 다소 복잡하고 전문화 되어있기 때문이다. 이에 본 연구에서는 명반응을 밝힌 Hill Reaction 실험을 수정하여 학교 현장에서 구현할 수 있도록 교육자료를 개발하였다. 또한, Hill Reaction 실험의 구성을 접목한 인공광합성 기술 소개를 포함하여 구성하였다. 이 교육자료를 활용함으로써 탐구 활동을 수행하고, 첨단과학기술의 기저에 있는 지식과 학교에서 배우는 지식을 연결해보면서 과학에 관한 관심과 소양이 커질 수 있을 것이다.

Immobilization of molecular catalysts for artificial photosynthesis

황동렬 나노기술연구협의회 2020 Nano Convergence Vol.7 No.37

Artificial photosynthesis offers a way of producing fuels or high-value chemicals using a limitless energy source of sunlight and abundant resources such as water, ­CO 2 , and/or ­O 2 . Inspired by the strategies in natural photosynthesis, researchers have developed a number of homogeneous molecular systems for photocatalytic, photoelectrocatalytic, and electrocatalytic artificial photosynthesis. However, their photochemical instability in homogeneous solution are hurdles for scaled application in real life. Immobilization of molecular catalysts in solid supports support provides a fine blueprint to tackle this issue. This review highlights the recent developments in (i) techniques for immobilizing molecular catalysts in solid supports and (ii) catalytic water splitting, ­CO 2 reduction, and ­O 2 reduction with the support-immobilized molecular catalysts. Remaining challenges for molecular catalyst-based devices for artificial photosynthesis are discussed in the end of this review.

Biomimetic Artificial Photosynthesis: Visible Light-Driven Cofactor Regeneration and Photoenzymatic Synthesis

Chan Beum PARK,Jungki RYU,Dong Heon NAM,Jae Hong KIM,Minah LEE,Joon Seok LEE 한국생물공학회 2011 한국생물공학회 학술대회 Vol.2011 No.4

Interface Engineering of Hematite with Nacre-like Catalytic Multilayers for Solar Water Oxidation

Choi, Yeongkyu,Jeon, Dasom,Choi, Yuri,Kim, Dongseok,Kim, Nayeong,Gu, Minsu,Bae, Sanghyun,Lee, Taemin,Lee, Hyun-Wook,Kim, Byeong-Su,Ryu, Jungki American Chemical Society 2019 ACS NANO Vol.13 No.1

<P>An efficient water oxidation photoanode based on hematite has been designed and fabricated by tailored assembly of graphene oxide (GO) nanosheets and cobalt polyoxometalate (Co-POM) water oxidation catalysts into a nacre-like multilayer architecture on a hematite photoanode. The deposition of catalytic multilayers provides a high photocatalytic efficiency and photoelectrochemical stability to underlying hematite photoanodes. Compared to the bare counterpart, the catalytic multilayer electrode exhibits a significantly higher photocurrent density and large cathodic shift in onset potential (∼369 mV) even at neutral pH conditions due to the improved charge transport and catalytic efficiency from the rational and precise assembly of GO and Co-POM. Unexpectedly, the polymeric base layer deposited prior to the catalytic multilayers improves the performance even more by facilitating the transfer of photogenerated holes for water oxidation through modification of the flat band potential of the underlying photoelectrode. This approach utilizing polymeric base and catalytic multilayers provides an insight into the design of highly efficient photoelectrodes and devices for artificial photosynthesis.</P> [FIG OMISSION]</BR>

Artificial photosynthesis: nanoengineered photoactivated materials for CO₂ conversion into hydrocarbon fuels

인수일 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1

The development of solar powered photo-activated materials promises to have a major impact in a variety of future applications in environmentally friendly science, such as solar energy conversion (solar fuel and photoelectrocatalysis). Currently various strategies for synthesizing new hybrid materials that photocatalytically convert CO₂ into methane under solar irradiation, have been developed. It will be of significant interest to extend the results obtained in this work to new avenues, such as an examination of modified photocatalysts for hydrogen generation and in dyesensitised solar cells as an alternate energy source. It would be also very desirable to broaden these studies to a variety of environmental systems including antibiotic application and self cleaning systems.

Charge transfer between photosynthetic proteins and hematite in bio-hybrid photoelectrodes for solar water splitting cells

Faccio Greta,Gajda-Schrantz Krisztina,Ihssen Julian,Boudoire Florent,Hu Yelin,문봉진,Bora Debajeet K,Thöny-Meyer Linda,Braun Artur 나노기술연구협의회 2015 Nano Convergence Vol.2 No.9

Functionalization of the hematite photoanode with the photosynthetic light antenna protein C-phycocyanin (PC) can yield substantial enhancement of the photocurrent density. Photoelectrochemical cells with bio-hybrid electrodes from photosynthetic proteins and inorganic semiconductors have thus potential for the use in artificial photosynthesis. We investigate here processing routes for the functionalization of hematite photoanodes with PC, including in situ co-polymerization of PC with enzymatically-produced melanin, and using a recombinant PC genetically engineered to carry a hexa-histidine tag (αHisPC). First, the effect of the immobilisation of PC on the electrode morphology and photocurrent production is evaluated. Then, the electronic charge transfer in dark and light conditions is assessed with electrochemical impedance spectroscopy and valence band (VB) X-ray photoemission spectroscopy. The relative shift of the VB spectrum towards the Fermi energy E F upon illumination is smaller for the more complex processed coating and virtually disappears for αHisPC immobilised with a melanin film. Optimal conditions for protein immobilisation are determined and the dark currents benefit most from the most advanced protein coating processes.

자연광과 형광등이 실내식물의 광합성량 및 엽록소함량에 미치는 영향

이주윤(Lee Ju-Yoon),이종영(Lee Jong-Young),한승원(Han Seung-Won),송규동(Song Kyoo-Dong) 한국건축친환경설비학회 2007 한국건축친환경설비학회 논문집 Vol.1 No.3

Countries around the world recognize the importance of the lighting energy saving. Many study of the comparison of the daylighting and the artificial lighting were realized. But the comparison was not precise by reason of the weather varying from hour to hour. The evaluating performance of the daylighting and the artificial lighting must be evaluated in the same condition. In this study two experiment chambers which were consist of daylight and artificial lighting were made. And to make the same illuminance condition. 12 32W flours cant lamp were used with dimming-controller. The same illuminance of two chambers could enable the precise comparison experiment. In the photosynthesis. an increasing rate of the plants in daylighting chamber was higher than that in artificial chamber, and in the chlorophyll is same. The reason of this result is showed by difference of spectrum energy. The light-absorbing pigments of plant need the spectrum of the large wavelength. The spectrum energy of daylighting is consist of ultraviolet, infrared ray and visible rays. But the spectrum energy of fluorescent lighting is only high in the special wavelength.

태양광 활용 광전기화학적 인공광합성 일산화탄소생산의 경제성평가

김진현(Jin Hyun Kim),민병권(Byoung Koun Min),조용성(Yongsung Cho) 한국신재생에너지학회 2017 신재생에너지 Vol.13 No.1

Because of the widespread demand for a low-carbon society, the necessity of renewable energy is one of the most promising solutions for the future. In keeping pace with other environmental-friendly technologies, artificial photosynthesis is one of the latest technologies that produces chemical fuel and various energy sources without pollution. Because artificial photosynthesis uses carbon dioxide to produce chemical fuels, it has been evaluated as a promising core technology that may also provide a solution for climate change. In this study, artificial photosynthesis with a photoelectrochemical cell was designed and economic analysis on carbon monoxide and oxygen production was performed. In addition, a sensitivity evaluation was performed on the change in discount rate, benefit, and cost. The results showed that with a 10% efficiency rate and 5% discount rate on an artificial photosynthesis device, the artificial photosynthesis device generates 1.414 trillion Won of NPV. Therefore, the artificial photosynthesis device has high economic potential. As the efficiency of the device was changed to 10%, 13%, and 15%, the amount of carbon dioxide used for the reaction increased to as much as 24,309ton, 29,200ton and 36,500ton, respectively. This indicates that the artificial photosynthesis device also has a carbon dioxide reduction effect.

Agri-environmental System Engineering and Energy : Utilization Efficiencies of Electric Energy and Photosynthetically Active Radiation of Lettuce Grown under Red LED, Blue LED and Fluorescent Lamps with Different Photoperiods

( Hye In Lee ),( Yong Hyeon Kim ) 한국농업기계학회 2013 바이오시스템공학 Vol.38 No.4

Purpose: This study was conducted to analyze the utilization efficiencies of electric energy and photosynthetically active radiation of lettuce grown under red LED, blue LED and fluorescent lamps with different photoperiods. Methods: Red LED with peak wavelength of 660 nm and blue LED with peak wavelength of 450 nm were used to analyze the effect of three levels of photoperiod (12/12 h, 16/8 h, 20/4 h) of LED illumination on light utilization efficiency of lettuce grown hydroponically in a closed plant production system (CPPS). Cool-white fluorescent lamps (FL) were used as the control. Photosynthetic photon flux, air temperature and relative humidity in CPPS were maintained at 230 μmol?m?2?s?1, 22/18°C (light/darkness), and 70%, respectively. Electric conductivity and pH were controlled at 1.5-1.8 dS?m?1 and 5.5-6.0,respectively. The light utilization efficiency based on the chemical energy converted by photosynthesis, the accumulated electric energy consumed by artificial lighting sources, and the accumulated photosynthetically active radiation illuminated from artificial lighting sources were calculated. Results: As compared to the control, we found that the accumulated electric energy consumption decreased by 75.6% for red LED and by 70.7% for blue LED. The accumulated photosynthetically active radiation illuminated from red LED and blue LED decreased by 43.8% and 33.5%, respectively, compared with the control. The electric energy utilization efficiency (EEUE) of lettuce at growth stage 2 was 1.29-2.06% for red LED, 0.76-1.53% for blue LED, and 0.25-0.41% for FL. The photosynthetically active radiation utilization efficiency (PARUE) of lettuce was 6.25-9.95% for red LED, 3.75-7.49% for blue LED, and 2.77-4.62% for FL. EEUE and PARUE significantly increased with the increasing light period. Conclusions: From these results, illumination time of 16-20 h in a day was proposed to improve the light utilization efficiency of lettuce grown in a plant factory.

인공 광합성 기술 기반 고부가가치 물질 생산 시스템

임성제(Seongje Lim),김광희(Kwang Hee Kim),김성순(Sungsoon Kim),박종혁(Jong Hyeok Park) 한국세라믹학회 2020 세라미스트 Vol.23 No.4

Solar energy utilization has been drawn attention due to the environmental issues. Photoelectrochemical and photocatalytic water splitting for hydrogen production, which is well-known solar-to-chemical process, have been studied so far, however it is now facing limitations of efficiency along with affordable cost. Recently, research trends in artificial photosynthesis are changing their redox reaction to produce value-added chemicals. Thanks to the previously studied solar water splitting technologies and materials, value-added chemicals production by solar energy is now evolving rapidly by taking advantages from the established works. Here, we introduce various kinds of redox reactions for producing value-added chemicals via photoelectrochemical and photocatalytic process. Throughout the article, solar-driven redox reactions such as CO 2 reduction, H 2 O 2 production are comprehensively discussed from the fundamentals to the applications. Consequently, future perspectives are suggested, which may help put forward future commercialization of photoelectrochemical or photocatalytic value-added chemical production technologies.