Templated Synthesis of Carbon-Free Mesoporous Magnéli-Phase Titanium Suboxide

Kuroda, Yoshiyuki; Igarashi, Hikaru; Nagai, Takaya; Napporn, Têko W.; Matsuzawa, Koichi; Mitsushima, Shigenori; Ota, Ken‐ichiro; Ishihara, Akimitsu

doi:10.1007/s12678-019-00544-3

Cited by 6 publications

(23 citation statements)

References 36 publications

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“…Pt deposition on the surface of Nb-Ti 4 O 7 mounted on a glassy carbon (GC) rod was achieved using the APD method based on our previous study. 15 First, 4 mg of Nb-Ti 4 O 7 was suspended in 400 µL 1-hexanol (97 %, FUJIFILM Wako Pure Chemical Corporation), followed by sonication for 20 min to prepare a Nb-Ti 4 O 7 ink. Subsequently, 10 µL Nb-Ti 4 O 7 ink was dropped onto a GC rod (] = 5.2 mm, Tokai Carbon Co., Ltd.), and dried at 60 °C for 1 h (denoted as Nb-Ti 4 O 7 /GC).…”

Section: Preparation Of Pt/nb-ti 4 O 7 Electrodesmentioning

confidence: 99%

“…The Pt loading amount for APD was confirmed in a previous study using by inductively coupled plasma atomic emission spectroscopy. 15 The Pt loading was adjusted based on the weight ratio of Nb-Ti 4 O 7 on the GC rod. Pt could not be deposited uniformly inside the pores of Nb-Ti 4 O 7 by APD because the deposition was in one direction.…”

Section: Preparation Of Pt/nb-ti 4 O 7 Electrodesmentioning

confidence: 99%

“…However, some are unstable in the highly acidic environment of the proton exchange membrane of PEFCs. Indium tin oxide, 13 TiO 2 , 14 and Ti 6 O 11 15 are stable in acidic environments. Reduced titanium oxides possessing Magnéli phase structures (Ti n O 2n¹1 ; 4 ¼ n ¼ 10), 16,17 particularly Ti 4 O 7 , are some of the most interesting support materials for PEFC cathodes because their high conductivity values are similar to those of carbon materials 17 and they are high in acidic media.…”

Section: Introductionmentioning

confidence: 99%

“…[23][24][25][26] We have also reported a templated synthesis of macroporous Magnéli-phase Ti 6 O 11 as a potential support for PEFC cathodes. 15 A highly ordered porous structure with a Ti 6 O 11 framework was obtained by the deposition of a TiO 2 precursor within a colloidal crystal template, followed by H 2 reduction. The templating process was advantageous for suppressing the agglomeration of the TiO x framework during H 2 reduction at high temperatures (800 °C).…”

Section: Introductionmentioning

confidence: 99%

“…38 In our study, the Pt nanoparticles deposited by APD on the macroporous Ti 6 O 11 presented a relatively high specific activity (SA) of 6.01 A m ¹2 at 0.9 V vs. RHE. 15 However, although the high durability of Pt/titanium-oxide-based catalysts have been commonly reported, the explanations of this property being better than those of Pt/C catalysts are typically the decreased oxidation of the titanium oxides supports and the SMSI between the supports and the metal. Moreover, the deterioration mechanism of the former catalyst has not been fully revealed until now.…”

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: Preparation Of Pt/nb-ti 4 O 7 Electrodesmentioning

confidence: 99%

Section: Preparation Of Pt/nb-ti 4 O 7 Electrodesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

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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Addressing Complex Transition Metal Oxides at the Nanoscale: Bottom‐Up Syntheses of Nano‐objects and Properties

Portehault

Gonell

Gómez‐Recio

2022

Tailored Functional Oxide Nanomaterials

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An impressive library of functional oxide nanomaterials is now available, encompassing multicompartment nanoparticles and heterostructures in general that enable further tuning of the properties. Nonetheless, the vast majority of these nano-objects is built on relatively common oxides, easily synthesized at the nanoscale by chemical methods known since decades. This range of nanoscaled oxides is narrow compared to the library of bulk oxides. Extending the portfolio of oxide compositions at the nanoscale is mandatory to strengthen research efforts on the role of the nanoscale on the properties, and on the emergence of new properties. This chapter provides an overview of the synthesis techniques developed since few years to address complex oxide nanomaterials, encompassing multicationic oxides, oxides of metals with uncommon oxidation states, and new oxide crystal structures accessible only at the nanoscale.For each case, we illustrate the relevance of targeting such complex oxides by discussing their specific properties. doctoral researcher. His main interest is the synthesis design of multifunctional nanomaterials for their application in electrocatalysis.

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Recent advances of metal suboxide catalysts for carbon‐neutral energy applications

Ding,

Duan,

Chen

2024

EcoEnergy

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Metal suboxides have emerged as a class of promising candidates for many electrocatalytic applications owing to their enhanced electrical conductivity and chemical activities. In this review, we have summarized the recent progress of metal suboxides. We have firstly introduced the discovery of metal suboxides, and their categories according to element tables. Then various metal suboxides synthetic methods have been systematically illustrated involving solid‐state synthesis, high‐temperature synthesis, low‐temperature synthesis and plasma‐driven synthetic methods, etc. In addition, their applications have been demonstrated in the field of water, carbon and nitrogen cycle‐based energy catalysis technologies involving electrochemical hydrogen evolution reaction, oxygen evolution reaction, oxygen reduction reaction, carbon dioxide reduction, urea oxidation reaction, methanol oxidation reaction, nitrogen reduction reaction and nitrate reduction reaction, etc. Finally, we make a brief conclusion about the developments of metal suboxides, giving an outlook for future research challenges. These insights are expected to hold promise for developing metal suboxide catalysts toward practical applications.

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Templated Synthesis of Carbon-Free Mesoporous Magnéli-Phase Titanium Suboxide

Cited by 6 publications

References 36 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

Addressing Complex Transition Metal Oxides at the Nanoscale: Bottom‐Up Syntheses of Nano‐objects and Properties

Recent advances of metal suboxide catalysts for carbon‐neutral energy applications

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