화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.108, 514-521, April, 2022
DOI10.1016/j.jiec.2022.01.033  Export Citation
Iridium-cobalt mixed oxide electrode for efficient chlorine evolution in dilute chloride solutions
Sanghwi Han1, Seongsoo Kim1, Sungjun Kwak2, Changha Lee1, Dae Hong Jeong2, Choonsoo Kim3, †, and Jeyong Yoon1, 4, †
  • 1School of Chemical and Biological Engineering, College of Engineering, Institute of Chemical Processes, Seoul National University (SNU), 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
  • 2Department of Chemistry Education, Seoul National University (SNU), 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
  • 3Department of Environmental Engineering and Institute of Energy/Environment Convergence Technologies, Kongju National University, 1223-24, Cheonan-daero, Cheonan-si 31080, Republic of Korea
  • 4Korea Environment Institute, 370 Sicheong-daero, Sejong 30147, Republic of Korea
E-mail:,
In wastewater treatment, the dimensionally stable anodes (DSAs) based on costly metals are currently being used for electrochlorination due to their superb chlorine evolution reaction (CER) performance. However, owing to their low OER overpotential, DSAs show poor current efficiency for CER in dilute chloride solutions (<50 mM), which are common wastewater conditions. Therefore, this study aimed to fabricate a novel anode for efficient chlorine evolution in dilute chloride solutions. To control the OER overpotential, cobalt oxide was selected as an electrode material and iridium was added as a cocatalyst with a small content (<3% atomic percent) to improve stability. Iridium-cobalt mixed oxide (ICO) electrode showed a sevenfold improvement in CER efficiency (15%) in 1 mM NaCl concentration compared to pristine IrO2 (2%). In addition, above a 50 mM NaCl concentration, ICO exhibited an excellent CER efficiency close to unity. Furthermore, superiority as a CER anode was also demonstrated with high stability (>200 h) in the accelerated stability test (0.5 M H2SO4 solution at 0.1 A cm-2) as well as superior ammonium degradation performance in dilute aqueous conditions. These results suggest that ICO can be a promising anode with its high CER efficiency, low cost, and notable stability.
Keywords:Cobalt oxide;Dimensionally stable anode;Wastewater treatment
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