TY - JOUR
T1 - Effect on percolation threshold of catalytic layer
T2 - Pt/N-Doped graphene shell onto SWCNT for ORR electrode
AU - Dechojarassri, Duangkamol
AU - Wang, Xiaoyang
AU - Chae, Sangwoo
AU - Sawada, Yasuyuki
AU - Hashimoto, Takeshi
AU - Saito, Nagahiro
N1 - Funding Information:
This research is based on the results obtained from a project commissioned by the New Energy and Industrial Technology Development Organization (NEDO, Grant JPNP20003). This work was supported by Monozukuri R&D Support Grant Program for Small and Medium Enterprises Agency (SMEs) (JPJ005698). In addition, this work was partially supported by Japan Science and Technology Agency (JST)‐Program on Open Innovation Platform with Enterprises Research Institute and Academia (OPERA), (JPMJOP1843), and Strategic International Collaborative Research Program (SICORP), (JPMJSC18H1 of JST).
Publisher Copyright:
© 2022 Wiley-VCH GmbH.
PY - 2023/2
Y1 - 2023/2
N2 - A high-rate oxygen reduction reaction (ORR) is necessary for polymer electrolyte membrane fuel cells (PEMFC). In this work, by using a solution plasma technique, Pt catalytic particles coated with N-doped graphene (Pt-NG) were effectively produced at 25°C. According to transmission electron microscope images, the average diameter of Pt particles was 4 nm, while the graphene layer thickness was less than 1 nm. A catalytic layer of Pt-NG supported on single-walled carbon nanotubes (Pt-NG/SWCNT) was synthesized. Cyclic voltammetry was used to assess the ORR characteristics of Pt-NG/SWCNT catalytic layers. Only at a density of SWCNT to solvent ratio of 0.75 mg ml−1 were the ORR peaks clearly visible. Because of the high resistivity of SWCNT layers, the ORR peaks in other ranges, 0.4 mg ml−1 to 2.0 mg ml−1, were not clearly observed. The effect of SWCNT concentration on conductivity was proven to follow the basic concept of the percolation threshold.
AB - A high-rate oxygen reduction reaction (ORR) is necessary for polymer electrolyte membrane fuel cells (PEMFC). In this work, by using a solution plasma technique, Pt catalytic particles coated with N-doped graphene (Pt-NG) were effectively produced at 25°C. According to transmission electron microscope images, the average diameter of Pt particles was 4 nm, while the graphene layer thickness was less than 1 nm. A catalytic layer of Pt-NG supported on single-walled carbon nanotubes (Pt-NG/SWCNT) was synthesized. Cyclic voltammetry was used to assess the ORR characteristics of Pt-NG/SWCNT catalytic layers. Only at a density of SWCNT to solvent ratio of 0.75 mg ml−1 were the ORR peaks clearly visible. Because of the high resistivity of SWCNT layers, the ORR peaks in other ranges, 0.4 mg ml−1 to 2.0 mg ml−1, were not clearly observed. The effect of SWCNT concentration on conductivity was proven to follow the basic concept of the percolation threshold.
KW - ORR
KW - SWCNT
KW - fuel cell
KW - percolation threshold
KW - platinum catalyst
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U2 - 10.1002/fuce.202200020
DO - 10.1002/fuce.202200020
M3 - Article
AN - SCOPUS:85141685112
SN - 1615-6846
VL - 23
SP - 4
EP - 14
JO - Fuel Cells
JF - Fuel Cells
IS - 1
ER -