IrO x +RhO x mixed oxide layers on a Ti support were prepd. by thermal decompn. at 450 ?C over the whole compn. range. The temp. range 450-600 ?C was explored for the compn. 30 mol% RhO x . Samples were characterized by means of SEM, XPS, cyclic voltammetry and polarization curves. Their electrocatalytic properties were tested for the H2 evolution reaction. The following exptl. parameters were scrutinized: voltammetric charge, Tafel slope, reaction order (H+), elec. resistance of electrocatalysts. The electrocatalytic properties were evaluated at const. potential as a function of temp. as well as of compn. The electrode stability was assessed by comparing CV curves before and after groups of expts. A reaction mechanism has been proposed. RhO x is more active than IrO x , its effect showing up for compns. >30 mol%.

Effect of composition on the surface and electrocatalytic properties of Ti/IrOx +RhOx electrodes: H2 evolution from acidic solution / L. Popa, E. Guerrini, S. Trasatti. - In: JOURNAL OF APPLIED ELECTROCHEMISTRY. - ISSN 0021-891X. - 35:12(2005), pp. 1213-1223.

Effect of composition on the surface and electrocatalytic properties of Ti/IrOx +RhOx electrodes: H2 evolution from acidic solution

E. Guerrini;S. Trasatti
2005

Abstract

IrO x +RhO x mixed oxide layers on a Ti support were prepd. by thermal decompn. at 450 ?C over the whole compn. range. The temp. range 450-600 ?C was explored for the compn. 30 mol% RhO x . Samples were characterized by means of SEM, XPS, cyclic voltammetry and polarization curves. Their electrocatalytic properties were tested for the H2 evolution reaction. The following exptl. parameters were scrutinized: voltammetric charge, Tafel slope, reaction order (H+), elec. resistance of electrocatalysts. The electrocatalytic properties were evaluated at const. potential as a function of temp. as well as of compn. The electrode stability was assessed by comparing CV curves before and after groups of expts. A reaction mechanism has been proposed. RhO x is more active than IrO x , its effect showing up for compns. >30 mol%.
Electrocatalysis; H2 evolution; Ir oxide; Mixed oxide electrodes; Rh oxide
Settore CHIM/02 - Chimica Fisica
JOURNAL OF APPLIED ELECTROCHEMISTRY
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/16378
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