Carbonate-superstructured solid fuel cells with hydrocarbon fuels

Abstract

A basic requirement for solid oxide fuel cells (SOFCs) is the sintering of electrolyte into a dense impermeable membrane to prevent the mixing of fuel and oxygen for a sufficiently high open-circuit voltage (OCV). However, herein, we demonstrate a different type of fuel cell, a carbonate-superstructured solid fuel cell (CSSFC), in which in situ generation of superstructured carbonate in the porous samarium-doped ceria layer creates a unique electrolyte with ultrahigh ionic conductivity of 0.17 S⋅cm −1 at 550 °C. The CSSFC achieves unprecedented high OCVs (1.051 V at 500 °C and 1.041 V at 550 °C) with methane fuel. Furthermore, the CSSFC exhibits a high peak power density of 215 mW⋅cm −2 with dry methane fuel at 550 °C, which is higher than all reported values of electrolyte-supported SOFCs. This provides a different approach for the development of efficient solid fuel cells.

Ultrafine, Dual-Phase, Cation-Deficient PrBa0.8Ca0.2Co2O5+δ Air Electrode for Efficient Solid Oxide Cells

“…The in situ -formed Co 3 O 4 phase with a relatively low melting temperature , probably serves as a bridging layer to firmly adhere the PBCC-d750 electrode to the GDC barrier layer (Figure b). The promotional effect of this bridging layer is similar to the enhancement of interfacial contact by diffusion of in situ generated molten carbonate from the cathode to the electrolyte in the case of carbonate-superstructured SOCs …”

“…The promotional effect of this bridging layer is similar to the enhancement of interfacial contact by diffusion of in situ generated molten carbonate from the cathode to the electrolyte in the case of carbonate-superstructured SOCs. 61 The excellent electrocatalytic activity and operating stability of the PBCC-d750 electrode (Figures 6e and S15…”

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“…Multiple studies have focused on novel fuel cell configurations at the reduced operating temperature in recent years. − Among these, a new-type fuel cell called single layer fuel cell (SLFC) was designed based on the LiAl 0.5 Co 0.5 O 2 material with good proton conductivity and exhibited a power output of 173 mW cm –2 at 525 °C . In addition, Zhu et al ,, developed a novel concept of electrolyte-free fuel cells or semiconductor-ionic fuel cells (SIFCs), which employed a semiconductor-ion conducting composite as the electrolyte functional layer.…”