Robust Ruddlesden‐Popper phase Sr₃Fe_1.3Mo_0.5N_i0.2O_7‐δ decorated with in‐situ exsolved Ni nanoparticles as an efficient anode for hydrocarbon fueled solid oxide fuel cells

Abstract

A highly efficient Ruddlesden‐Popper structure anode material with a formula of Sr3Fe1.3Mo0.5Ni0.2O7‐δ (RP‐SFMN) has been developed for hydrocarbon fueled solid oxide fuel cells (HF‐SOFC) application. It is demonstrated that a nanostructured RP‐SFMN anode decorated with in‐situ exsolved Ni nanoparticles (Ni@RP‐SFMN) has been successfully prepared by annealing the anode in reducing atmosphere similar to the operating conditions. The phase compositions, valence states, morphologies, and electrocatalytic activities of RP‐SFMN material have been characterized in detail. In addition, the in‐situ exsolution mechanism of the metallic Ni phase from the parent oxide is clearly explained by using density function theory calculation. The peak output power density at 800°C is significantly enhanced from 0.163 to 0.409 W/cm2 while the electrode polarization resistance is effectively lowered from 0.96 to 0.30 Ω cm2 by the substitution of B‐site Fe by Ni, which is attributed to the improved electrocatalytic activities induced by the in‐situ exsolved Ni nanocatalysts. Moreover, the single cell with RP‐SFMN anode exhibits good stability in 3% H2O humidified H2 and syngas for 110 and 60 h at 800°C, respectively. Our findings indicate that RP‐SFMN is a greatly promising anode candidate of HF‐SOFCs due to its good electrochemical performance and stability during the operation.

Synthesis of BaZr0.1Ce0.7Y0.2O3‐δ nano‐powders by aqueous gel‐casting for proton‐conducting solid oxide fuel cells

“…According to the total resistance of the electrolyte, the conductivity of the electrolyte in wet air (σ total ) can be calculated by Equation (2). And the results are shown in Figure 8.…”

“…With the rapid increase of fossil energy consumption, a large number of greenhouse gases and harmful gases, such as carbon dioxide, sulfur oxides and nitrogen oxides, are released, causing harm to the living environment. The development of renewable energy devices can effectively solve the problem of reducing the harm caused by fossil energy, which can alleviate environmental problems 1–3 . Solid oxide fuel cells (SOFCs) are regarded as one kind of generation device with advantages of no pollution, high power generation efficiency, and long‐term stability 4–6 .…”

“…The development of renewable energy devices can effectively solve the problem of reducing the harm caused by fossil energy, which can alleviate environmental problems. [1][2][3] # These authors contributed equally to this work.…”

Probing the Transport Properties, Electrophoretic Deposition, and Electrochemical Performance of La2–xSmxCe2O7 Ceramics for IT-SOFCs

“…This process is commonly referred to as carbon deposition or coking. − Apart from Ni, some other catalysts such as Cu, Fe, Pd, Pt, and Rh were also studied to avoid the coking phenomena when operating in methane fuel. − However, these catalysts limit the practical implications in terms of cost and processability despite the improvement in SOFC performance with carbon-containing fuels. Apart from metallic catalysts, several mixed ion and electron-conductive (MIEC) materials were also studied such as Sr­(Ti 0.3 Fe 0.7 )­O 3−δ , Sr 2 MgMoO 6−δ -related materials, − Sr 2 FeMoO 6−δ Pr 0.8 Sr 1.2 (Co,Fe) 0.8 Nb 0.2 O 4+δ , Sr 3 Fe 1.3 Mo 0.5 N i0.2 O 7−δ , and so on, for methane reforming or hydrocarbon fuel environment. These materials have their own limitations such as lower electronic conductivity and lower catalytic activity compared to Ni-based anodes .…”

Effect of TiO2 as an additive on the sintering performance of Sm-doped CeO2-based electrolyte for solid oxide fuel cells

“…As one of the most promising energy conversion technologies, solid oxide fuel cells (SOFCs) have been widely investigated and utilized in the past few decades owing to their low pollution emission and high conversion efficiency ( Chen et al, 2020 ; Sun et al, 2021 ; Tahir et al, 2022 ). Many efforts have been made to advance the application of SOFCs in large-scale power plants and various transportation systems ( Park et al, 2014 ; Curletti et al, 2015 ; Chen et al, 2018 ; Lee et al, 2018 ; Zhang et al, 2022 ). As an important component of SOFCs, the electrolyte acts as a gas barrier between the anode and the cathode, preventing the fuel and air from mixing.…”