Magnéli phase Ti₈O₁₅ nanowires as conductive carbon-free energy materials to enhance the electrochemical activity of palladium nanoparticles for direct ethanol oxidation

Abstract

Pure single-crystalline magnéli phase Ti 8 O 15 nanowires (NWs) has been successfully synthesized via a facile one-step evaporation-deposition synthesis method in hydrogen atmosphere. The electrical conductivity of a single Ti 8 O 15 nanowire is 2060 S m -1 at 300 K, which is much higher than carbon black (~ 100 S m -1 ) and almost as high as graphite (~ 1000 S m -1 ) or graphene (~ 2000 S m -1 ). Pd nanoparticles (NPs) loaded on Ti 8 O 15 nanowires are synthesized though a pulsed electrodeposition method. As carbon-free support materials for Pd NPs, the Pd/Ti 8 O 15 NWs shows a significant enhanced activity for ethanol oxidation reaction and excellent durability compared to Pd/C catalyst. The peak current density of the Pd/Ti 8 O 15 NWs after 2,000 cycles is 2791 mA mg -1 Pd , only 18.6 % lost. While, on the Pd/C electrode, only a current density of 682 mA mg -1 Pd is observed, lost 42.3 % of the initial ethanol oxidation reaction activity. The synthetic approach of pure single-crystalline magnéli phase Ti 8 O 15 nanowires gives the inspiration of the development of conductive carbon-free material for electrocatalysis in direct alcohol fuel cells (DAFCs).

Deposition of Photocatalytic TiO2 Coating by Modifying the Solidification Pathway in Plasma Spraying

“…This may be resulted from the lamellar structure of as-deposited TiO2 coatings stacked by flat granules, but it should be investigated further. Additionally, Ti8O15 phases are observed in all of as-prepared samples, which is consistent with other works [13,19]. For TiO2 coatings sprayed by thermal plasma, Magneli phases were widely reported [20].…”

Unravelling the promoting effect of the ultrathin TaC/RGO nanosheet hybrid for enhanced catalytic activity of Pd nanoparticles

“…S2). 47,48 The adsorption of hydrogen and formation of the palladium(II) oxide layer on Pd/TaC-G are weaker than Pd/C and Pd/G, and the oxidation of adsorbed and desorbed hydrogen on Pd/TaC-G are stronger than Pd/C and Pd/G, which means the adsorption of methanol on Pd/TaC-G is more facilitative than Pd/C and Pd/G, which would result in higher MOR activity. The typical low magnification TEM image of TaC-G is presented in Fig.…”

Synergistic Supports Beyond Carbon Black for Polymer Electrolyte Fuel Cell Anodes

“…In contrast, defect regulation may be a more efficient way. For example, pure single crystalline Magnéli phase Ti 2 O 15 nanowires with one oxygen vacancy per TiO 2 unit were developed by Shen et al., through a simple one‐step evaporation‐deposition process (Figure ). They measured the conductivity of Ti 2 O 15 nanowires to be 2060 S m −1 , even higher than those of commonly‐used carbon supports including graphene (2000 S m −1 ).…”

“… (a) Schematic diagram of experimental apparatus for growing Ti 8 O 15 NWs; (b) the corresponding model illustration and (c) SEM images of Ti oxides at the different scales . Copyright 2015, Royal Society of Chemistry.…”