Improvement of ORR with optimization of d-band center of Pt-based ordered intermetallic compound catalysts

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K05657
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 36010:Inorganic compounds and inorganic materials chemistry-related
• Research Institution: Kanagawa University
• Principal Investigator: Matsumoto Futoshi 神奈川大学, 工学部, 教授 (20318215)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 燃料電池 / 酸素還元反応 / d-バンドセンター / 担持体

Outline of Final Research Achievements

In this study, in order to develop sufficient ORR activity, clarification of the correlation between the electronic state and the activity of the electrocatalysts was examined. Therefore, Pt deposited on a series of transition metal oxides (MOx, M = Ti, Nb, Ta, W, Y and Zr) and transition metal oxide composites (M1M2Ox; M1M2 = TiNb, NbTa, and TaW) formed on conducting cup-stacked carbon nanotubes (CSCNTs) and PtX (X = Co, Fe, Ni and Pb) /CB were prepared. The ORR activities and d-band centers of the electrocatalysts prepared were evaluated with electrochemical and spectroscopic experiments. Because of the so-called strong metal-support interactions (SMSI), the significantly increased ORR activity was attained in 0.1 M HClO4, compared with the Pt NPs deposited on CB and CSCNT. Their ORR activities on Pt NPs/MOx/CSCNT and Pt NPs/M1M2Ox /CSCNT were found to significantly depend on the atomic ratio of M1 and M2 in M1M2Ox as well as the type of metal oxide support.

Free Research Field

電気化学　触媒化学

Academic Significance and Societal Importance of the Research Achievements

現在、CO2を削減し水素(H2)を主とするエネルギー構成が進んでいることで、中低温での作動を可能とし、H2と酸素(O2)から高効率で電気エネルギーが得られる固体高分子形燃料電池(PEFC)に注目が高まっている。しかし、現在のPEFCの正極側で生じる酸素還元反応(ORR)の触媒として用いられているカーボンブラック(CB)上に担持した白金(Pt)触媒(Pt/CB)は、ORRで高い過電圧が生じること触媒の劣化に関して問題視されている。本研究において従来のPt/CBに比べ、触媒活性と触媒耐久性を両立する触媒を開発した。この研究成果は他の触媒開発においても研究開発の参考になるものである。