화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.110, 198-205, June, 2022
DOI10.1016/j.jiec.2022.02.055  Export Citation
Surfactant assisted geometric barriers on PtNi@C electrocatalyst for phosphoric acid fuel cells
Injoon Jang1, Minjeh Ahn1, Sehyun Lee1, 2, †, and Sung Jong Yoo1, 3, †
  • 1Hydrogen Fuel Cell Research Center, Korea Institute of Science and Technology (KIST), 5 Hwarang-ro 14-gil, Seongbuk-gu, Seoul 02792, Republic of Korea
  • 2Department of Environment and Energy Engineering, Sungshin Women’s University, Seoul 01133, Republic of Korea
  • 3Division of Energy & Environmental Technology, KIST School, University of Science and Technology (UST), Daejeon 34113, Republic of Korea
E-mail:,
The alloying strategy of Pt with Ni is commonly employed to improve the catalytic activity of electrocatalysts owing to the higher activity required to lower the binding energy of oxygen with Pt. When Pt is alloyed with Ni, electron transfer from Ni to Pt is conducive to metallic Pt, lowering the oxygen binding energy. Although the alloying strategy can increase the catalytic activity, confirming that the surface state has the intended electronic structure is difficult because of the oxidation or dissolution of metals. To determine the surface state of catalyst nanoparticles for a more efficient structure, the concept of physical blocking of the reactive surface was applied to determine the geometric effect. The oxygen reduction reaction in phosphoric acid electrolytes is more sensitive to the geometric effect due to anion adsorption. In this work, we synthesized carbon-supported PtNi alloying nanoparticles with different carbon shell thicknesses (PtNi@Cx; x = 0.5, 1, 2, 4, where x refers to the concentration of the surfactant) from various concentration of organic surfactants. Among the nanoparticles with various carbon shell thicknesses, PtNi@C2 showed the best oxygen reduction reaction performance in the presence of phosphoric acid with an appropriate geometric effect, ensuring a synergetic effect with alloying.
Keywords:Phosphoric acid fuel cell;Electrocatalysts;Oxygen reduction reaction;Pt-Ni metal alloy;Carbon shell;Geometric effect
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