[논문]젖산 연료전지용 효소전극 제작 및 특성 분석

장연청; 김창준

doi:10.9713/kcer.2021.59.3.373

젖산 연료전지용 효소전극 제작 및 특성 분석
Fabrication and Characterization of Enzyme Electrode for Lactate Fuel Cell 원문보기

Korean chemical engineering research = 화학공학, v.59 no.3, 2021년, pp.373 - 378

장연청 (경상국립대학교 화학공학과 및 그린에너지 연구소) , 김창준 (경상국립대학교 화학공학과 및 그린에너지 연구소)

초록
AI-Helper

본 연구는 땀에 존재하는 젖산을 연료로 사용하여 전기를 생산하는 웨어러블 연료전지용 고전력 젖산 산화효소 전극을 개발하는 데 그 목적이 있다. 유연성 있는 탄소종이 기반의 고정화효소 전극을 제작하고 평가하였다. 전해질 내 젖산농도 증가에 따라 젖산 산화효소(lactate oxidase, LOx)의 촉매작용으로 전류생성량이 증가하였다. 금 나노입자가 부착된 탄소종이에 고정화된 LOx가 탄소종이에 부착된 LOx보다 1.5배 많은 전류를 생성하였다. 빌리루빈 산화효소(bilirubin oxidase, BOD)가 고정화된 cathode는 질소로 퍼지(purge)된 전해질보다 산소로 포화된 전해질에서 높은 환원전류를 발생시켰다. 두 전극으로 구성된 연료전지를 제작하여 방전전류 변화에 따른 셀전압을 측정하였다. 방전 전류밀도 값이 66.7 ㎂/cm²에서 셀 전압은 0.5±0.0 V였고, 셀 전력량은 최대치인 33.8±2.5 ㎼/cm²를 나타내었다.

Abstract ▼ AI-Helper

The study aimed to develop a high-power enzymatic electrode for a wearable fuel cell that generates electricity utilizing lactate present in a sweat as fuel. Anode was fabricated by immobilizing lactate oxidase (LOx) on flexible carbon paper. As the lactate concentration in the electrolyte solution increased, the amount of current generated by catalysis of lactate oxidase increased. The immobilized LOx generated 1.5-times greater oxidation current density in the presence of gold nanoparticles than carbon paper only. Bilirubin oxidase (BOD)-immobilized cathode generated a larger amount of reduction current in the electrolyte saturated with oxygen than purged with nitrogen. A fuel cell composed of two electrodes was fabricated and cell voltage was measured under different discharge current. At the discharge current density of 66.7 ㎂/cm2, the cell voltage was 0.5±0.0 V leading to maximum cell power density of 33.8±2.5 ㎼/cm2.

주제어

표/그림 (7)

그림 Fig. 1. (a) Fabricated carbon paper electrode and (b) schematic diagram of enzymatic fuel cell.
그림 Fig. 2. Cyclic voltammogram for carbon paper electrodes in 10 mM PBS (pH 7.0) supplemented with LOx, 1 mM PMS and sodium- L-lactate with different concentration. The scan rate was 20 mV/s.
그림 Fig. 3. Cyclic voltammogram for LOx electrodes in PMS (1 mM)- containing PBS (10 mM, pH 7.0) with or without sodium-Llactate (50 mM). The LOx was immobilized on carbon paper (CP) or carbon paper modified with gold nanoparticles (CPAuNPs) and the scan rate was 20 mV/s.
그림 Fig. 4. Niquist plots of measured and fitted values for LOx-immobilized electrodes. A equivalent circuit was given in inset.
그림 Fig. 5. Cyclic voltammogram for BOD electrodes in 100 mM citrate buffer (pH 5.0) supplemented with ABTS (1 mM). The BOD was immobilized on carbon paper modified with gold nanoparticles (CP-AuNPs) and electrolyte was purged with N₂ or saturated with O₂.
표 Table 1. Fitted impedance values for cabon paper based LOx electrode
그림 Fig. 6. (a) Time profiles of cell voltage under discharge and, (b) cell voltage (circle) and cell power density (rectangular) curves under different discharge currents for EFC consisting of CP-AuNPs-LOx (anode) and CP-AuNPs-BOD (cathode).

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저자의 다른 논문 :

표제어: PCR

동의어: Packet Collision Rate

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용어 설명: PCR은 세균 특이성이 있는 primer를 이용하여 적은 수의 세균이 있을지라도 쉽게 검출할 수 있는 유용한 방법이며, 이를 이용하여 구강 내 치면세균막이나 타액에서 직접 세균을 검출할 수 있게 되었다[8].

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