Investigation of H₂, CO and Syngas Electrochemical Performance Using Ni/YSZ Pattern Anodes

Abstract

In this work, Ni/YSZ pattern anodes with well-defined 2-D structure were employed to investigate the electrochemical oxidation of H 2 , CO and syngas. Electrochemical tests revealed that polarization resistance (R p ) depended on applied overpotenital and gas compositions. In H 2 /H 2 O environment, R p decreases when increasing overpotential, H 2 and H 2 O partial pressure. In CO/CO 2 environment, R p experiences a minimum value when increasing the overpotential from 0 to 0.3 V, and the minimum R p appears when the overpotential is 0.1 V. R p decreases with an increase in partial pressure of CO 2 , but increases when increasing partial pressure of CO. Charge transfer reactions contribute to the main electrode process in both H 2 /H 2 O and CO/CO 2 environments.

Electrochemical Oxidation of Syngas on Nickel and Ceria Anodes

“…Polarization resistance for oxidation of hydrogen (F1), CO (F5), and CO/H 2 mixture (F4) in dry environment are compared in table 7. Better cell performance with hydrogen than CO on nickel is inline with the literature [5,9,16,29,44,43]. However, the cell performance with hydrogen and CO on ceria is contradictory to the reported trend [29].…”

“…Figure 4 (a) shows that the polarization resistance for oxidation of CO (F5) is almost 2.5 times higher than that of hydrogen (F1). Higher polarization resistance and lower cell performance with CO compared to hydrogen on nickel anodes are reported [5,9,43,16,44,29]. With the addition of small amounts of hydrogen to the CO gas stream, the polarization resistance drops drastically.…”

“…For the simulation of syngas mixtures, all other parameters except gas phase concentrations were kept unchanged. 43 3…”

Electrochemical Oxidation of CO/H2 Mixtures on Ni and Ceria Pattern Anodes

“…However, it is barely investigated for electrochemical oxidation kinetics and reaction mechanisms of H 2 and CO and the co-oxidation of CO/H 2 mixtures. The electrochemical oxidation studies of CO/H 2 mixtures are mostly available for Ni based anodes (5)(6)(7)(8)(9)(10)(11). For example, Sukeshini et al (10) studied the co-oxidation using Ni pattern anodes.…”