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Supported Lipid Bilayers for Biomimetic Protochloroplast Energy Conversion System
JaeHyoung Yun(윤재형),Seon Il Kim(김선일),Jeong Jun Lee(이정준),Ho Yun Jung(정호윤),WonHyoung Ryu(류원형) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Cell membrane protects living cells from its environment by separating the inside of the cell from outside environment. However, in extracting photosynthetic electrons using whole photosynthetic cells, cell membrane hinders photosynthetic electron transfer. Therefore, isolated photosynthetic apparatuses such as photosystems I, II, or thylakoid membranes are used in many studies for bioenergy harvesting, but their stability is very low due to pH change and production of reactive oxygen species (ROS) during photosynthesis. In this work, we present forming supported lipid bilayer (SLB) on biophotoanode by mimicking cell membrane. The biomimetic lipid membrane, formed through the vesicle fusion process, created an internal environment without interfering electron transfer from photosynthetic apparatuses to the electrode. Under the SLB-encapsulating environment, pH and ROS were controlled by ADP, NADP+ and catalase, increasing the stability of bio-photoanode. The formation of SLB was confirmed through fluorescence spectroscopy and dye release experiment. The stability of biomimetic protochloroplast energy conversion system was also confirmed through longterm photocurrent harvesting. Moreover, SLB can act as a separator in electrochemical circuits due to its high electrical resistance. Electrical insulation property of SLB was confirmed using electrochemical impedance spectroscopy (EIS).
MnO2 부착 방식에 따른 3D 프린팅 광합성 전극의 특성 및 성능 분석 연구
정호윤(Ho Yun Jung),김용재(Yong Jae Kim),김선일(Seon Il Kim),윤재형(JaeHyoung Yun),류원형(WonHyoung Ryu) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Despite the harvesting of photosynthetic electrons (PEs) directly from thylakoid membrane has been studied for decades, practical usage of photosynthetic energy has been limited. One of the challenges is insufficient photosynthetic electrons harvesting due to small surface area of electrodes and inefficient charge storage performance. Here, we 3D printed electrodes with graphene oxide ink and modified its surface with MnO₂ deposition to enhance the extraction of PEs from thylakoids and capacitance of supercapacitors. Deposited MnO₂ layers served as a pseudocapacitive material and modify surface properties of electrode. The structure and surface property of the deposited manganese oxide were investigated by X-ray diffraction analysis and scanning electron microscopy (SEM). The capacitive characteristics of the electrode were studied by cyclic voltammetry and current charge-discharge test. Both capacitive and surface characteristics were influenced by the deposition method of MnO₂. As a result of performance test, highest specific capacitance value of 370F/g and 600 ∕ ㎠ photosynthetic current density were obtained at potentiodynamic deposition at 400mV/s condition. This suggests the excellent supercapacitor and bioanode performance of 3D printed electrode with MnO₂ deposition.