Structure and electrochemical properties of titanate perovskite with in situ exsolution as a ceramic electrode material
- PDF / 4,066,562 Bytes
- 10 Pages / 595.276 x 790.866 pts Page_size
- 35 Downloads / 176 Views
Structure and electrochemical properties of titanate perovskite with in situ exsolution as a ceramic electrode material Yuxuan Zhang 1,3 & Youkun Tao 2 & Zhouyang Yu 1 & Jiamei Lu 1 & Sung Yul Lim 1 & Jing Shao 1 Received: 8 November 2019 / Accepted: 20 November 2020 # The Author(s), under exclusive licence to Springer Science+Business Media, LLC part of Springer Nature 2020
Abstract In this work, the structure and electrochemical properties of titanate ceramics with in situ Ni exsolution are investigated to identify the structure-performance relationship of the exsolved perovskite for use as electrode materials in solid oxide cells. The phase formation, redox behaviour and exsolution properties of the material have been studied. The characteristics of the individual electrochemical processes are identified and correlated with the Ni doping and microstructural evolution. The results indicate that the electrode activity is strongly dependent on the density and particle size of the in situ grown Ni nanoparticles. The interfacial ion transfer and charge transfer processes can be promoted by increasing the electrode surface area or improving the adhesion between the electrode and electrolyte, while the surface electrode processes including the dissociative adsorption are more dependent on the porosity and electrode/electrolyte interfacial region of the exsolved titanate electrode. Keywords Solid oxide cells . Ceramic electrode . Perovskite . Exsolution . Structure-performance relationship
1 Introduction As one of the most efficient energy conversion devices, solid oxide cells (SOCs) can be reversibly operated as solid oxide fuel cells (SOFCs) and solid oxide electrolysis cells (SOECs) [1–3]. SOFCs convert the chemical energy from a wide range of fuels into electricity with high efficiency and low pollution [4, 5]. SOECs offer either enhanced efficiency in the evolution of H2 from water splitting or cleaner fuels from CO2 compared to those produced with traditional electrolysis approaches [6, 7]. Their good scalability, broad adaptability and high efficiency make SOCs a promising clean energy technology for a wide range of applications [8–11]. Among the components of SOCs, the electrodes directly determine the performance and durability of the devices [9]. In recent years, titanate perovskite with in situ exsolution has Yuxuan Zhang and Youkun Tao contributed equally to this work. * Jing Shao [email protected] 1
College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, China
2
School of Science, Harbin Institute of Technology, Shenzhen 518055, China
3
Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
attracted a substantial amount of research attention as a promising electrode material for SOCs because of its high electronic conductivity [12], phase stability [13], and tolerance to carbon and sulphur-contamination [14, 15]. By doping metal elements into the perovskite lattice and in situ exsolving metallic nanoparticles, the catalytic act
Data Loading...
