Hauptseite > Publikationsdatenbank > Nanoscopic Porous Iridium/Iridium Dioxide Superstructures (15 nm): Synthesis and Thermal Conversion by In Situ Transmission Electron Microscopy > print

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024 7 _ |a 10.1002/chem.201901623
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100 1 _ |a Pappert, Kevin
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245 _ _ |a Nanoscopic Porous Iridium/Iridium Dioxide Superstructures (15 nm): Synthesis and Thermal Conversion by In Situ Transmission Electron Microscopy
260 _ _ |a Weinheim
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|b Wiley-VCH
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520 _ _ |a Porous particle superstructures of about 15 nm diameter,consisting of ultrasmall nanoparticles of iridium andiridium dioxide, are prepared through the reduction ofsodium hexachloridoiridate(+IV) with sodium citrate/sodiumborohydride in water. The water-dispersible porous particlescontain about 20 wt% poly(N-vinylpyrrolidone) (PVP), whichwas added for colloidal stabilization. High-resolution transmissionelectron microscopy confirms the presence of bothiridium and iridium dioxide primary particles (1–2 nm) ineach porous superstructure. The internal porosity(58 vol%) is demonstrated by electron tomography. In situtransmission electron microscopy up to 1000 8C underoxygen, nitrogen, argon/hydrogen (all at 1 bar), and vacuumshows that the porous particles undergo sintering and subsequentcompaction upon heating, a process that starts ataround 250 8C and is completed at around 8008C. Finally,well-crystalline iridium dioxide is obtained under all four environments.The catalytic activity of the as-prepared poroussuperstructures in electrochemical water splitting (oxygenevolution reaction; OER) is reduced considerably upon heatingowing to sintering of the pores and loss of internal surfacearea.
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536 _ _ |a DFG project 257727131 - Nanoskalige Pt Legierungselektrokatalysatoren mit definierter Morphologie: Synthese, Electrochemische Analyse, und ex-situ/in-situ Transmissionselektronenmikroskopische (TEM) Studien (257727131)
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773 _ _ |a 10.1002/chem.201901623
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