Understanding of A-site deficiency in layered perovskites: promotion of dual reaction kinetics for water oxidation and oxygen reduction in protonic ceramic electrochemical cells. Issue 29 (14th July 2020)

• Record Type: Journal Article
• Authors: Tang, Wei; Ding, Hanping; Bian, Wenjuan; Wu, Wei; Li, Wenyuan; Liu, Xingbo; Gomez, Joshua Y.; Regalado Vera, Clarita Y.; Zhou, Meng; Ding, Dong
• Is Part Of: Journal of materials chemistry. Volume 8:Issue 29(2020)
• Page Start: 14600
• Page End: 14608
• Publication Date: 2020-07-14
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d0ta05137c
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : An A-site deficient layered perovskite PBCC95 is developed as a new oxygen electrode incorporated into a protonic ceramic electrochemical cell. The cell presents superior electrochemical performances and it can reversibly work between the electrolysis and fuel cell mode. Abstract : Protonic ceramic electrochemical cells (PCECs) are promising solid-state energy conversion devices which enable the conversion of energy between electricity and hydrogen at intermediate temperatures. Rapid conversion between chemical and electrical energy via PCEC technology will assist in overcoming grand challenges in energy storage. To achieve highly efficient reversible operation between hydrogen production and electricity generation, boosting water-oxidation and oxygen reduction activities of the oxygen electrode while maintaining the durable operation is one of the early-stage technical opportunities. In this study, an A-site deficient layered perovskite (PrBa0.8 Ca0.2 )0.95 Co2 O6− δ has been developed as an oxygen electrode for a PCEC which presents superior electrochemical performances. The electrolysis current density reached as high as −0.72 A cm −2 at 1.3 V, and a peak power density of 0.540 W cm −2 was obtained at 600 °C in electrolysis and fuel cell mode, respectively. The PCEC with the new electrode shows good durability under practical operating conditions for 160 hours in both operating modes with no observable degradation. The reversibility between the electrolysis and fuel cell mode is also successfully demonstrated.