Control of surface area and conductivity of niobium-added titanium oxides as durable supports for cathode of polymer electrolyte fuel cells

Ma, Yongbing; Nagai, Takaya; Inoue, Yuta; Ikegami, Kaoru; Kuroda, Yoshiyuki; Matsuzawa, Koichi; Napporn, Têko W.; Liu, Yan; Mitsushima, Shigenori; Ishihara, Akimitsu

doi:10.1016/j.matdes.2021.109623

Cited by 8 publications

(9 citation statements)

References 60 publications

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“…The initial filling rate of the sample in the measuring fixture was 7 %. Although the surface areas of the Nb-TiO x nanoparticles from our previous study 22 and macroporous Nb-Ti 4 O 7 were of similar orders, the latter had higher conductivity than had the former by two orders. Figure S2 summarizes the relationship between the conductivity and surface area of various reported titanium-oxide-based supports.…”

Section: Physical Characterization Of Macroporous Nb-ti 4 O 7 Supportmentioning

confidence: 53%

“…Figure S2 summarizes the relationship between the conductivity and surface area of various reported titanium-oxide-based supports. 22,29,[51][52][53][54] The details regarding the published supports are provided in Table S1.…”

Section: Physical Characterization Of Macroporous Nb-ti 4 O 7 Supportmentioning

confidence: 99%

“…We have previously reported a hydrothermal synthesis of Nb-doped TiO 2 nanoparticles for their application as PEFC cathode supports. 22 Their conductivity and surface area were negatively correlated because enhanced conductivity was achieved only by H 2 reduction at higher temperatures, which increased the agglomeration of primary particles, and thereby reduced the surface area. Utilizing its high conductivity and large surface area, Nbdoped/added TiO x has also been extensively used as a support in PEFC cathodes.…”

Section: Introductionmentioning

confidence: 99%

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Degradation Analysis of Pt/Nb–Ti4O7 as PEFC Cathode Catalysts with Controlled Arc Plasma-deposited Platinum Content

KAJIMA

Shimasaki

et al. 2022

Electrochemistry

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For polymer electrolyte fuel cell cathodes, highly durable supports are required to prevent catalyst degradation in supports. In this study, as model Pt catalysts, 2-10 wt% Pt was deposited on Magnéli-phase niobium-doped macroporous Ti 4 O 7 (Nb-Ti 4 O 7 ) mounted on glassy carbon rods using the coaxial arc plasma deposition method. The morphologies of 2, 5, and 10 wt% Pt catalysts showed the hemisphere fine particles, islands with ca. 1.4 nm diameter and ca. 2.4 nm thickness, and films with ca. 3.3 nm thickness, respectively. During start/stop accelerated durability tests (ADTs) of 5000 cycles following the Fuel Cell Commercialization Conference of Japan protocol, Pt was slightly agglomerated; consequently, the morphologies of the 2, 5, and 10 wt% Pt catalysts were island-like with 3.5 nm thickness, chain bead-like with 4 nm thickness, and film-like with 4 nm thickness, respectively. This slight agglomeration led to good durability during the ADTs. Herein, the oxygen reduction reaction (ORR) mass activity (MA) values at 0.9 V vs. reversible hydrogen electrode (RHE) of the 2, 5, and 10 wt% Pt catalysts were 79, 60, and 36 A g À1 Pt after 5000 cycles ADT, respectively, which had declining ratios after 5000 cycles were 32 %, 17 %, and 0 %, respectively. The island-like and film-like Pt/Nb-Ti 4 O 7 presented activity and durability comparable to a Pt/C catalyst, which was 42 A g À1 Pt (0.9 V vs. RHE) with a 12 % of declining ratio after the ADTs. The durability of the MA suggested that the different affinity caused by different crystal faces led to the slight agglomeration of 2, 5, and 10 wt%_Pt/Nb-Ti 4 O 7 catalysts. These catalysts showed electrochemical surface areas (ECSAs) of 36, 27, and 29 m 2 g −1 after the ADTs, with declining ratios as low as 20 %, 6 %, and 0 %, respectively. All Pt/Nb-Ti 4 O 7 catalysts showed higher durability of the ECSAs than the Pt/C catalyst, which was 68 m 2 g −1 with a 30 % declining ratio after the ADT. Different from common Pt nanoparticle catalysts, which agglomerate into large spherical Pt particles, the slight agglomeration was caused by the interconnection of the deposits and supplemented by a limited increase in the diameter or thickness. The island-like morphology of Pt with a limited thickness presented both high durability and activity among the Pt/Oxide catalysts.

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Section: Physical Characterization Of Macroporous Nb-ti 4 O 7 Supportmentioning

confidence: 53%

Section: Physical Characterization Of Macroporous Nb-ti 4 O 7 Supportmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Degradation Analysis of Pt/Nb–Ti4O7 as PEFC Cathode Catalysts with Controlled Arc Plasma-deposited Platinum Content

KAJIMA

Shimasaki

et al. 2022

Electrochemistry

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“…The most of current researches on cathode catalysts mainly focuses on either ORR or OER activity, with limited bidirectional activity, which would show limited performance in the context of Liair battery cathodes [14]. In PEMFCs, conductive porous material, Pt are commonly chosen due to its superior ORR activity compared to other metals [12,14,19]. RuO 2 , PtO 2 , and IrO 2 have been proven to perform well in OER, as indicated by trends in oxygen evolution activity plotted against the oxygen dis-binding energy [16].…”

Section: Introductionmentioning

confidence: 99%

“…In the preceding research focused on OER support catalyst design, Metal-Organic Frameworks (MOFs) was found to promote the growth of nanoparticles and enhance their activity [17]. Followed by discovery of novel carbon materials, such as fullerenes, CNTs, graphene, graphitic carbon nitride (GCN) [18], titanium oxides [19] and carbon black in material science, catalyst design has significantly enhanced the catalytic activity and durability of electrochemical catalysts with their high surface area, conductivity, and stability, thereby promoting the development of efficient energy conversion systems like metal-air batteries. The main reason for the lack of stable Li-air batteries is the formation of solid Li x O 2 , which obstructs the active sites on the cathode [20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Design of Ir/Pt dual electrocatalysts loaded on exfoliated acetylene black for Li air battery application

Zhou,

Higashimine,

Badam

et al. 2023

Mater. Res. Express

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This study introduces a novel type of electrocatalysts, where Pt and Ir nanoparticles were incorporated onto exfoliated acetylene black (FAB) substrate. These electrocatalysts were engineered to exhibit dual activity, simultaneously facilitating both oxygen reduction reaction and oxygen evolution reaction. The successful creation of these dual-function electrocatalysts, namely FAB180-Pt/Ir and FAB60-Pt/Ir, was confirmed through characterization techniques including transmission electron microscopy (TEM), x-ray photoelectron spectroscopy (XPS), energy-dispersive x-ray spectroscopy (EDS), and high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM). Ultimately, this bimetallic Pt-Ir catalyst, supported on exfoliated acetylene black (FAB), hold potential for application in Li-air batteries.

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An overview of noncarbon support materials for membrane electrode assemblies in direct methanol fuel cells: Fundamental and applications

Ke,

Yuan,

Liu

et al. 2023

Materials & Design

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Control of surface area and conductivity of niobium-added titanium oxides as durable supports for cathode of polymer electrolyte fuel cells

Cited by 8 publications

References 60 publications

Degradation Analysis of Pt/Nb–Ti<sub>4</sub>O<sub>7</sub> as PEFC Cathode Catalysts with Controlled Arc Plasma-deposited Platinum Content

Degradation Analysis of Pt/Nb–Ti<sub>4</sub>O<sub>7</sub> as PEFC Cathode Catalysts with Controlled Arc Plasma-deposited Platinum Content

Design of Ir/Pt dual electrocatalysts loaded on exfoliated acetylene black for Li air battery application

An overview of noncarbon support materials for membrane electrode assemblies in direct methanol fuel cells: Fundamental and applications

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