."State Estimation in Volmer-Heyrovsky Reaction Coupled with Sorption Processes. Application to the Hydrogen Reaction"

E. B. CASTRO; R. H. MILOCCO

JOURNAL OF ELECTROANALYTICAL CHEMISTRY

Elsevier.Ltd

Año: 2007 vol. 604 p. 1 - 8

0022-0728

ABSTRACT           In this work a procedure to estimate variables of  electrochemical systems involving adsorption of intermediate species couples to diffusion, is presented. The method is model-based and needs potential and current measurements. Since the system is linear and time variant, the well known Kalman´s filter theory is used to estimate the variables. An analysis of theoretical observability shows the procedure success even in the case of constant potential/current. The error estimation converge asymptotically to zero for slow time variations. The procedure is useful to estimate H concentration in metallic substrates during H evolution anf insertion. To illustrate the proposed procedure, state observation of the hydrogen concentration on steel and metal hydride electrode are presented. In  the last case, the procedure is used to estimate the state charge of the electrode.