Fiber-like nanostructured Ti4O7 used as durable fuel cell catalyst support in oxygen reduction catalysis

Yao, Chuanhao; Li, Fan; Li, Xiang; Xia, Dingguo

doi:10.1039/c2jm32866f

Cited by 91 publications

(73 citation statements)

References 28 publications

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“…Their structures are characterized by two-dimensional shear plane slabs of Ti-O octahedra. Ti 4 O 7 has been utilized as a Pt catalyst support for fuel cells because of its high electronic conductivity (about threefold greater than graphite) 29 ; however, its utilization in an ultrahigh surface area modification, which is essential for optimal sulphide interaction, has not yet been reported for energy-storage applications. We synthesized this material by a simple polymer-mediated route (see Methods for details) that relies on the crosslinking of titanium ethoxide with polyethylene glycol followed by carbothermal reduction to crystallize the desired oxygendeficient titanium oxide.…”

Section: Resultsmentioning

confidence: 99%

Surface-enhanced redox chemistry of polysulphides on a metallic and polar host for lithium-sulphur batteries

et al. 2014

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The lithium-sulphur battery relies on the reversible conversion between sulphur and Li 2 S and is highly appealing for energy storage owing to its low cost and high energy density. Porous carbons are typically used as sulfur hosts, but they do not adsorb the hydrophilic polysulphide intermediates or adhere well to Li 2 S, resulting in pronounced capacity fading. Here we report a different strategy based on an inherently polar, high surface area metallic oxide cathode host and show that it mitigates polysulphide dissolution by forming an excellent interface with Li 2 S. Complementary physical and electrochemical probes demonstrate strong polysulphide/Li 2 S binding with this 'sulphiphilic' host and provide experimental evidence for surface-mediated redox chemistry. In a lithium-sulphur cell, Ti 4 O 7 /S cathodes provide a discharge capacity of 1,070 mAh g À 1 at intermediate rates and a doubling in capacity retention with respect to a typical conductive carbon electrode, at practical sulphur mass fractions up to 70 wt%. Stable cycling performance is demonstrated at high rates over 500 cycles.

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Section: Resultsmentioning

confidence: 99%

Surface-enhanced redox chemistry of polysulphides on a metallic and polar host for lithium-sulphur batteries

et al. 2014

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“…These materials showed good catalytic activities for ORR in acid media. Yao et al synthesised platinised fibre-like Ti 4 O 7 which showed superior durability as well as enhanced Pt mass activity in comparison to commercial Pt/C catalyst in 0.5 M H 2 SO 4 [54]. Pulsed electrodeposition technique was employed by Zhang et al to synthesise and deposit Pt nanoparticles onto the TiO 2 nanotube arrays as a support for fuel cells [55].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical oxygen reduction behaviour of platinum nanoparticles supported on multi-walled carbon nanotube/titanium dioxide composites

Jukk

Kongi

Tarre

et al. 2014

Journal of Electroanalytical Chemistry

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“…Because of these excellent properties, Ti 4 O 7 or Ebonex TM was applied in the field of waste water treatment, especially in removing the sulfur in the high concentrated salt water [10,11]. Also, it could be used as a catalyst support for precious metals; the supported catalysts exhibited high catalytic activity and stability in fuel cell applications [12][13][14][15]. Therefore, the applications of Ti 4 O 7 in various kinds of batteries had been become more and more popular recently, such as the Ni-Zn secondary battery [16], metal-air battery [17,18] and Li-S battery [19,20].…”

Section: Introductionmentioning

confidence: 99%

“…However, the reported conditions of reduction were completely different. The temperature was at the range of 1073-1573 K, and the reduction time was from 2 to 36 h [10,13]. Therefore, the synthesis of substoichiometric Ti-O compounds needed to be studied systematically; meanwhile, 24 types of compounds in Ti-O system have been reported.…”

Section: Introductionmentioning

confidence: 99%

Kinetic study on preparation of substoichiometric titanium oxide via carbothermal process

Wang

Fan

Yan

et al. 2015

J Therm Anal Calorim

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Gibbs free energy was applied to analyze the carbothermal reduction process of TiO 2 . The phase stable diagram of Ti-C-CO was drawn, and it can be found that TiO 2 will be reduced to Ti-O Magnéli phase, Ti n O 2n-1 (3 \ n \ 10) or Ti 3 O 5 first and then further reduced to TiC. However, in the present study, it was found that Ti 4 O 7 can be reduced to TiC directly when the temperature was lower than 800 K and lg(p co /p h ) \ -1.1. The reduction route was proved by the results of non-isothermal TG-DTA combined XRD. The isothermal analysis of carbothermal reduction process of TiO 2 via TG-DTA under the temperature of 1363, 1413, 1463 and 1513 K was performed. The whole reduction process was divided into two sections: Initially it was rate controlled by an interfacial reaction, and later was rate controlled by three-dimensional diffusion. The modified mathematical expressions were deduced. They fit the experimental curves well. Their activation energy of steps was 241.1 and 323.4 kJ mol -1 , respectively. A Pre-exponential factor C p Isobaric heat capacity (J K -1 ) E a Activation energy (J mol -1 ) G Gibbs free energy (J mol -1 ) D r G Gibbs free energy of the reaction (J mol -1 ) G h T Standard Gibbs free energy of a pure substance at temperature T (J mol -1 ) G h i;T Standard Gibbs free energy of i component at T temperature (J mol -1 ) H Enthalpy (J mol -1 ) H h 298

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Fiber-like nanostructured Ti4O7 used as durable fuel cell catalyst support in oxygen reduction catalysis

Cited by 91 publications

References 28 publications

Surface-enhanced redox chemistry of polysulphides on a metallic and polar host for lithium-sulphur batteries

Surface-enhanced redox chemistry of polysulphides on a metallic and polar host for lithium-sulphur batteries

Electrochemical oxygen reduction behaviour of platinum nanoparticles supported on multi-walled carbon nanotube/titanium dioxide composites

Kinetic study on preparation of substoichiometric titanium oxide via carbothermal process

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