[논문]전기적 염소 발생 촉매활성을 위한 성형된 루테늄 산화물 나노로드와 나노시트 전극의 개발

트란 루 레; 김춘수; 윤제용

doi:10.11001/jksww.2017.31.5.373

전기적 염소 발생 촉매활성을 위한 성형된 루테늄 산화물 나노로드와 나노시트 전극의 개발
Development of templated RuO2 nanorod and nanosheet electrodes to improve the electrocatalytic activities for chlorine evolution 원문보기

上下水道學會誌 = Journal of Korean Society of Water and Wastewater, v.31 no.5, 2017년, pp.373 - 381

트란 루 레 (베트남 독일 대학교 메카트로닉스-센서 시스템 학과) , 김춘수 (서울대학교 화학생물공학부 화학공정 신기술 연구소 & 아시아에너지환경지속가능발전 연구소) , 윤제용 (서울대학교 화학생물공학부 화학공정 신기술 연구소 & 아시아에너지환경지속가능발전 연구소)

Abstract ▼ AI-Helper

$RuO_2$ is a common active component of Dimensionally Stable Anodes (DSAs) for chlorine evolution that can be used in wastewater treatment systems. The recent improvement of chlorine evolution using nanostructures of $RuO_2$ electrodes to increase the treatment efficiency and reduce the energy consumption of this process has received much attention. In this study, $RuO_2$ nanorod and nanosheet electrodes were simply fabricated using the sol-gel method with organic surfactants as the templates. The obtained $RuO_2$ nanorod and nanosheet electrodes exhibit enhanced electrocatalytic activities for chlorine evolution possibly due to the active surface areas, especially the outer active surface areas, which are attributed to the increase in mass transfers compared with a conventional nanograin electrode. The electrocatalytic activities for chlorine evolution were increased up to 20 % in the case of the nanorod electrode and 35% in the case of the nanosheet electrode compared with the nanograin electrode. The $RuO_2$ nanorod 80 nm in length and 20-30 nm in width and the $RuO_2$ nanosheet 40-60 nm in length and 40 nm in width are formed on the surface of Ti substrates. These results support that the templated $RuO_2$ nanorod and nanosheet electrodes are promising anode materials for chlorine evolution in future applications.

주제어

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문제 정의

These results are explained by the better mass transport of the RuO₂ nanorod and nanosheet electrodes due to more effective surface areas participating in the chlorine evolution reaction compared with that of the conventional nanograin electrode. This study supports that the templated RuO₂ nanorod and nanosheet electrodes are promising materials for higher electrocatalytic performance and the less energy consumption in the future chlor-alkali industry.

가설 설정

As shown in Fig. 1 (a), the one dimensional nanorod structures grew almost in a random direction. The rods appear to be stable with a single layer and were separated from each other.

제안 방법

The electrochemical properties were examined with cyclic voltammetry (CV), linear sweep voltammetry (LSV), and total chlorine concentration (DPD) methods.
nanorod and nanosheet electrodes for chlorine evolution are compared with the conventional nanograin electrode. The microstructures of the as-prepared electrodes were evaluated with scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-Ray diffraction (XRD). The electrochemical properties were examined with cyclic voltammetry (CV), linear sweep voltammetry (LSV), and total chlorine concentration (DPD) methods.

대상 데이터

, 2008). The experiments were performed at room temperature in a conventional single compartment cell with three electrodes using a computer-controlled potentiostat (PARSTAT 2273A, Princeton Applied Research, USA). The volume of the electrolyte solution in the cell was 150 ml.
Titanium foils (dimensions, 30 × 20 × 0.25 mm, purity 99.7%, Aldrich-Sigma) were used as the substrate materials, for which the contaminants were removed by emery paper and then degreased in acetone.

이론/모형

01 M HCl (pH 2) which is a favorable condition for chlorine evolution. The concentrations of the total active chlorine dissolved in the solution after the electrolysis in 0.1 M NaCl (pH 6) were determined by the DPD (N, N-diethyl-p-phenylenediamine) colorimetric method. The electrolysis time was 10 min.
The preparation of the titanium coated RuO₂ electrodes was done with the sol-gel method. This solution phase method, which is called sol-gel, can be carried out in soft-environments and appears to have positive effects on the fabrication of the RuO₂ electrode in terms of both a high electrocatalytic activity and stability in chlorine evolution (Panic et al.
To study the crystallinity of the RuO2 electrodes, a high resolution X-ray diffraction pattern was obtained with the grazing incidence technique on a D8 Discover (Bruker-AXS, Germany) diffractometer (CuKα, λ = 1.5406 Å).

성능/효과

This study showed that templated RuO₂ nanorod and nanosheet electrodes can be used as efficient electrocatalysts for chlorine evolution reactions when compared with that of the nanograin electrode. The RuO₂ nanorod and nanosheet electrodes were synthesized with a tailored architecture using organic templates and compared with the conventional nanograin electrode.

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