Enhancing Bifunctional Electrocatalytic Activities of La_0.5Sr_0.5Co_0.2Fe_0.8O₃ in Reversible Single-Component Cells

Abstract

Perovskite La0.5Sr0.5Co0.2Fe0.8O3 (LSCF) usually acts as both cathode and anode in a reversible solid oxide cell (RSOC). It is found that the traditional preparation method can be improved to reduce the particle size, increase the specific surface area, and enhance the oxygen vacancy concentration of LSCF, further improving its bifunctional electrocatalytic activity toward oxygen reduction reaction (ORR) and hydrogen oxidation reaction (HOR). Compared with that of LSCF prepared by the traditional solid-state reaction method, the oxygen vacancy concentration of LSCF prepared by the hard-template method is increased. Moreover, the LSCF prepared by the hard-template method shows better catalytic activity for HOR and ORR. In addition, the rate-determining steps for HOR and ORR on the surface of LSCF prepared by the hard-template method are the charge transfer reaction and the reduction of oxygen atoms to O–, respectively. Furthermore, a single-component fuel cell and a reversible single-component cell composed of LSCF prepared by the hard-template method exhibit better performance for discharge and water electrolysis.

Clean and Sustainable Power to X to Power by Reversible Symmetrical Solid Oxide Cells with Highly Active Ferrite Perovskite Electrodes

“…While the MF and HF display a weak relation with the PH 2 . Similar to the dependence of each resistance at different frequency regions on PO 2 , the dependence of each resistance at different frequency regions on PH 2 can be expressed as R p – (PH 2 ) m . The m values represent the different reaction steps on the fuel electrode, and the relationship between them is listed in Table S2.…”

“…Similar to the dependence of each resistance at different frequency regions on PO 2 , the dependence of each resistance at different frequency regions on PH 2 can be expressed as R p − (PH 2 ) m . 44 The m values represent the different reaction steps on the fuel electrode, and the relationship between them is listed in Table S2. Specifically, in this work, m = −0.3126 at LF between 0 and −0.5, demonstrating that the reaction process at LF is a mixed process including charge transfer reactions and oxygen surface exchange.…”

Effect of Fluorine Doping on the Performance of Reversible Solid Oxide Cells and Related Kinetic Studies

“…由于半导体材料同时参与阳极和阴极反应, 因此对 半导体材料的结构和活性有较高的要求 [10] . 在众多电 极材料中, 具有混合离子和电子导电性(MIEC)和优异 氧化还原能力的钙钛矿氧化物(如 Sr 2 Fe 1.5 Mo 0.5 O 6-δ 和 La 0.5 Sr 0.5 FeO 3 等)被广泛用作 RSOC 的阳极和阴极材 料 [11][12] .…”

Electrochemical Properties of La0.6A0.4Co0.2Fe0.8O3 (A = Sr, Ca, Ba) as a Bifunctional Electrode for Reversible Solid Oxide Cells

“…6,7 The ionic conductor plays the role of transporting oxygen ions in the cell, while the semiconductor material plays the role of a bifunctional (fuel oxidation and oxidant reduction) catalyst. 8,9 In addition, because the SCFC has no clear electrolyte/electrode interface, it can effectively reduce the interface resistance of the cell. Therefore, SCFCs can operate at lower operating temperatures.…”

“…The traditional fuel cell is a three-layer structure. Zhu et al reported a new type of cell structure: single-component fuel cell (SCFC), which is composed of a semiconductor and ionic conductor material. , The ionic conductor plays the role of transporting oxygen ions in the cell, while the semiconductor material plays the role of a bifunctional (fuel oxidation and oxidant reduction) catalyst. , In addition, because the SCFC has no clear electrolyte/electrode interface, it can effectively reduce the interface resistance of the cell. Therefore, SCFCs can operate at lower operating temperatures .…”