[논문]Co3S4 nanosheets on Ni foam via electrodeposition with sulfurization as highly active electrocatalysts for anion exchange membrane electrolyzer

Park, Yoo Sei; Lee, Jeong Hun; Jang, Myeong Je; Jeong, Jaehoon; Park, Sung Min; Choi, Woo-Sung; Kim, Yangdo; Yang, Juchan; Choi, Sung Mook

doi:10.1016/j.ijhydene.2019.10.169

[해외논문] Co3S4 nanosheets on Ni foam via electrodeposition with sulfurization as highly active electrocatalysts for anion exchange membrane electrolyzer

International journal of hydrogen energy, v.45 no.1, 2020년, pp.36 - 45

Park, Yoo Sei (Materials Center for Energy Convergence, Surface Technology Division, Korea Institute of Materials Science (KIMS)) , Lee, Jeong Hun (Materials Center for Energy Convergence, Surface Technology Division, Korea Institute of Materials Science (KIMS)) , Jang, Myeong Je (Materials Center for Energy Convergence, Surface Technology Division, Korea Institute of Materials Science (KIMS)) , Jeong, Jaehoon (Materials Center for Energy Convergence, Surface Technology Division, Korea Institute of Materials Science (KIMS)) , Park, Sung Min (Materials Center for Energy Convergence, Surface Technology Division, Korea Institute of Materials Science (KIMS)) , Choi, Woo-Sung (Materials Center for Energy Convergence, Surface Technology Division, Korea Institute of Materials Science (KIMS)) , Kim, Yangdo (Department of Materials Science and Engineering, Pusan National University Yang, Juchan , Choi, Sung Mook

Abstract ▼ AI-Helper

Abstract Co3S4 nanosheets on Ni foam (NS/NF) were prepared by sulfurization for various time after calcination of electrodeposited Co(OH)2. In our FE-SEM images, we observed that Co3S4 NS was vertically, or obliquely, deposited on the Ni foam. As a result, the structure contained more active sites, and active sites were highly accessible to the electrolyte for the hydrogen evolution reaction (HER). Furthermore, results of XPS and XRD analysis confirmed S-conversion from Co3O4 to Co3S4 during sulfurization. 3-Co3S4 NS/NF with sulfurization for 3 h exhibited the highest sulfur content, while Co3S4 began to desulfurize to Co9S8 after sulfurization for 4 h. The 3-Co3S4 NS/NF electrocatalyst showed a lowest overpotential of 93 mV at −10 mA/cm2, with a Tafel slope of −55.1 mV/dec in N2-purged 1 M KOH. Also, the single cell anion exchange membrane water electrolyzer (AEMWE) showed a high current density of 431 mA/cm2 with cell voltage 2.0 Vcell at 40–45 °C. Highlights The Co3S4 nanosheets on Ni foam was prepared by electrodeposition and sulfurization for various time. The Co3S4 nanosheets on Ni foam with sulfurization for 3 h indicated the highest sulfur content. The Co3S4 nanosheets on Ni foam with sulfurization for 3 h showed a lowest overpotential of 93 mV at −10 mA/cm2 in 1 M KOH. The single cell anion exchange membrane water electrolyzer (AEMWE) showed a high current density of 431 mA/cm2 at 2.0 Vcell. Graphical abstract [DISPLAY OMISSION]

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