Understanding the A-site non-stoichiometry in perovskites: promotion of exsolution of metallic nanoparticles and the hydrogen oxidation reaction in solid oxide fuel cells

Abstract

Metallic nanoparticles structured perovskite oxides prepared by the in-situ exsolution method are widely utilized as alternative anodes for solid oxide fuel cells. In this work, SrxFe1.3Ni0.2Mo0.5O6-δ (SFNMx, x=1.90, 1.95, 2.00,...

Boosting the stability of perovskites with exsolved nanoparticles by B-site supplement mechanism

“…2 and 3) 10,[24][25][26] . However, the limited Sr-site deficiency (<5% mol) in the SFNM makes it fail to refill the B-site vacancies after the exsolution by controlling the A-site deficiency 27 . Therefore, the TIEassisted exsolution was employed to fine-tune the B-site occupation of perovskite scaffold while promoting the formation of nanoparticles.…”

Robust in situ exsolved nanocatalysts on perovskite oxide as an efficient anode for hydrocarbon fueled solid oxide fuel cells

“…The enhancement of the electrochemical performance with increasing operating temperature can be explained by the improved electro-catalytic properties and increased oxygen ion conductivity of the anode. 39,40,58,65,66 The short-term stability of the different anode materials has also been obtained at 850 °C to evaluate the coking resistance capability of the anodes under C 3 H 8 conditions, as shown in Fig. 7c, and at a constant voltage of 0.7 V the performance degradation rate of LPBM 0.8 F 0.2 –GDC is 41.4% for the 16 hour stability test.…”

“…The electrochemical performance of the single cells was studied by using a home-made testing system in our laboratory. 39 All electrochemical tests were performed using an electrochemical workstation (Versa STAT3, Princeton Applied Research). The current density versus voltage ( i – V ) curves were recorded from 1.2 to 0.2 V at a scanning rate of 30 mV s −1 when the cathode and anode of the single cell were exposed to ambient air and flowing 3% H 2 O humidified H 2 /C 3 H 8 , respectively.…”

“…The exsolved nanoparticles with good dispersion properties provide more active sites for catalytic fuel oxidation reactions, which will strongly improve the performance of the material when used as an anode. 34–39 Nowadays, there have been several studies on A-site deficient (Pr,Ba) 2 Mn 2− y Fe y O 5+ δ , which is considered as a very promising electrode material for enhancing CO 2 catalytic activation and direct electroreduction. 40,41 In addition, when using the Fe-doped Pr 0.5 Ba 0.5 MnO 3− δ as a symmetric SOFC electrode, it exhibits high electrical conductivity, excellent electrocatalytic activity, good redox properties and high carbon coking tolerance.…”

Thermodynamic analysis of the electrochemical synthesis of ammonia in solid-state proton-conducting electrochemical reactors considering interfacial potential steps

“…Ammonia as a carbon-free hydrogen carrier possesses several advantages as compared to hydrogen as fuel, such as much higher volumetric energy density (3.5 kW L À1 ), matured mass production technology, easy storage and transportation. 1 NH 3 can be used as fuel directly in solid oxide fuel cells [2][3][4] and internal combustion engines. Nowadays, the dominant way of industrial ammonia production is the Haber-Bosch (HB) method, which was developed in the early 20th century.…”