Rational Design of Superior, Coking‐Resistant, Nickel‐Based Anodes through Tailoring Interfacial Reactions for Solid Oxide Fuel Cells Operated on Methane Fuel

Abstract

The reaction between a Ni-Y O -stabilized ZrO (Ni-YSZ) cermet anode and La WO (LW) during cell fabrication is utilized to reduce carbon deposition in solid oxide fuel cells operated on methane fuel. The effect of the phase reactions on the microstructure, electrical conductivity, chemical interactions, and coking resistance of the anodes are systematically investigated. Ni W and La-doped YSZ are formed by phase reactions and the synergistic effect between them increases the coking resistance dramatically. 2 wt % is demonstrated to be the optimal amount of LW to modify Ni-YSZ to achieve best coking resistance. The cell with Ni-YSZ-2 wt % LW anode demonstrates a superior peak power density of 943 mW cm at 800 °C with humidified methane as fuel, which is 10 % higher than that of Ni-YSZ (859 mW cm ). Furthermore, the cell is stable for 200 h in methane fuel with no clear performance degradation while the cell with unmodified anode fails after 0.5 h's operation. In summary, we provide a new way to rationally design Ni-based cermet anode with high electrocatalytic activity and excellent coking resistance.

Self-Assembled Triple-Conducting Nanocomposite as a Superior Protonic Ceramic Fuel Cell Cathode

“…25 Water formation may even occur within the cathode bulk if the material has some water storage capability (hydration). 26,27 Thus, a triple-conducting material is well suited for cathode of PCFCs and dual-ion FCs. [28][29][30][31] Unfortunately, due to their insufficient ORR activity and low electronic conductivity, these materials do not have sufficient electrocatalytic activity in PCFCs and dualion FCs, especially when current collection is not well managed (Figure 1C).…”

Advanced Cathode Materials for Protonic Ceramic Fuel Cells: Recent Progress and Future Perspectives

“…[16,17] Copyright 2017 and 2018, Wiley-VCH. are expected to extend the effective reaction area, leading to a decrease in R p , [98,99] which has motivated researchers to develop triple H + /O 2− /e − conducting materials for PCFCs.…”

“…In principle, the double conductors hinder the migration of protons from the surface to the gas−cathode−electrolyte triple phase boundary, and thus limit the reaction area (as illustrated in Figure 16 a). Hence, the proton transfer channels in oxides are expected to extend the effective reaction area, leading to a decrease in R p , [ 98,99 ] which has motivated researchers to develop triple H + /O 2− /e − conducting materials for PCFCs.…”

Power Generation by Flat-Tube Solid Oxide Fuel Cells with Enhanced Internal Reforming of Methanol

“…The solid oxide fuel cell (SOFC) has attracted wide attention because of its high energy conversion efficiency and low emission of pollutants. , The high operating temperature of the SOFC (600–1000 °C) allows direct internal reforming (DIR) of hydrocarbons including methane, methanol, ethanol, propane, etc. − These hydrocarbon fuels are easier to handle for fuel cell applications than pure hydrogen. This is because hydrocarbon fuels are usually mass produced at low cost, and the technologies of liquefaction, transportation, and storage are well-established in the industry.…”