Perovskites based on La(Sr)-Mn-O system as electrocatalyst in PEM fuel cell of high temperature

Villaseca, L.; Moreno, B.; Chinarro, E.

doi:10.1016/j.ijhydene.2011.12.142

Cited by 4 publications

(2 citation statements)

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“…In the last years, several proton-transport materials based on perovskites, , mesoporous silicas, − polysiloxanes, metal–organic frameworks (MOFs), − or azoles − have been proved to be useful to act as a proton-conducting electrolyte in PEM fuel cells. The incorporation of strong acidic terminal groups and the presence of temporary bonding sites for the protons are some of the required aspects to achieve fast and highly selective proton conduction.…”

Section: Introductionmentioning

confidence: 99%

“…8 Despite all these favorable properties the final efficiency of the fuel cell will largely depend upon the electrolyte and the manner how the protons transfer between the electrodes across the cell. 9 In the last years, several proton-transport materials based on perovskites, 10,11 mesoporous silicas, 12−15 polysiloxanes, 16 metal−organic frameworks (MOFs), 17−21 or azoles 22−24 have been proved to be useful to act as a proton-conducting electrolyte in PEM fuel cells. The incorporation of strong acidic terminal groups and the presence of temporary bonding sites for the protons are some of the required aspects to achieve fast and highly selective proton conduction.…”

Section: Introductionmentioning

confidence: 99%

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Water-Free Proton Conduction in Discotic Pyridylpyrazolate-based Pt(II) and Pd(II) Metallomesogens

Cuerva¹,

Campo²,

Cano³

et al. 2016

Inorg. Chem.

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In this work we report on water-free proton conductivity in liquid-crystal pyridylpyrazolate-based Pt(II) and Pd(II) complexes [M(pz(R(n,n)py))2] (pz(R(n,n)py) = 3-(3,5-dialkyloxyphenyl)-5-(pyridin-2-yl)pyrazolate, R(n,n) = C6H3(OCnH2n+1)2; n = 4, 12, 16, M = Pd; n = 12, M = Pt) with potential application as electrolyte materials in proton exchange membrane fuel cells. The columnar ordering of the complexes in the liquid-crystalline phase opens nanochannels, which are used for fast proton exchange as detected by impedance spectroscopy and NMR. The NMR spectra indicate that the proton conduction mechanism is associated with a novel C-H···N proton transfer, which persists above the clearing point of the material. The highest conductivity of ∼0.5 μS cm(-1) at 180 °C with an activation energy of 1.2 eV is found for the Pt(II) compound in the mesophase. The Pd(II) complexes with different chain length (n = 4, 12, and 16) show lower conductivity but smaller activation energies, in the range of 0.74-0.93 eV.

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