Development and performance of A-site rich perovskite-type material for enhanced oxygen evolution reaction in alkaline e
- PDF / 1,489,973 Bytes
- 7 Pages / 595.276 x 790.866 pts Page_size
- 36 Downloads / 201 Views
Development and performance of A-site rich perovskite-type material for enhanced oxygen evolution reaction in alkaline electrolyte Tianjing Li1, Wei Guo2, and Qingle Shi2,* 1 2
Institute of Automotive and Traffic Engineering Yancheng Polytechnic College, Yancheng 224005, Jiangsu, P. R. China School of Materials Engineering, Yancheng Institute of Technology, Yancheng 224051, Jiangsu, P. R. China
Received: 3 July 2020
ABSTRACT
Accepted: 8 October 2020
A-site rich perovskites Ba2xCoMoO6 (x = 1, 1.1, 1.2, and 1.3) were synthesised by a solid-state reaction method. The as-prepared Ba2.4CoMoO6 catalyst showed good catalytic activity towards oxygen evolution reaction (OER) activity with an overpotential of 420 mV at 10 mA cm-2, which was enhanced by 100 mV compared with that of Ba2CoMoO6, with a low Tafel slope of 79 mV dec-1, an obviously enhanced electrochemical active surface area value, and sharply improved mass and specific activities. The enhanced OER activity even surpassed the precious metal oxide IrO2 and perovskite benchmark Ba0.5Sr0.5Co0.8Fe0.2O3-d activities.
Ó
Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction Oxygen evolution reaction (OER) plays a critical role in the development of alternative energy storage and conversion device, such as water electrolyser, rechargeable metal-air battery and solid oxide fuel cell [1, 2]. However, its sluggish kinetics is badly in need of electrocatalyst to accelerate the reaction process [3]. Perovskite oxide with a general formula of ABO3 has been extensively explored as highly efficient OER catalyst [4]. On one hand, B represents transition metal ions (TMI), such as cobalt, nickel, and irons, which are reported to be OER active, and at least 90% of TMI can been introduced into A-site by doping strategy [5, 6]. As for the high valence TMI,
Address correspondence to E-mail: [email protected]
https://doi.org/10.1007/s10854-020-04639-2
such as molybdenum, tungsten, and niobium, the vital function of them is to tune the structure of perovskite, which can alter the catalytic activity in turn [7–9]. On the other hand, A represents rare-earth or alkali metal ions, the role of which is analogous to the high valence TMI [10]. In addition, compared with single perovskite (ABO3), double perovskite (A2BB’O6) has been demonstrated to show unique properties for OER in alkaline solution, such as short reaction pathway and synergistic effect of B-site cations [9]. A-site deficient is a common and an effective way to tailor the OER performance of perovskite and considerable materials have been explored acted as much promising electrocatalysts in the field of solid oxide fuel cell [11–13]. For example, Da et al. reported
J Mater Sci: Mater Electron
that A-site deficiency Sr0.95Co0.8Fe0.2O3-d exhibited enhanced OER activity compared with the parent oxide SrCo0.8Fe0.2O3-d, which was attributed to the increased oxygen vacancies and optimised eg occupancy [3]. However, to the best of our knowledge, limited literature have reported the A-site rich perovsk
Data Loading...
