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Thermally stable and coke resistant CoMo alloy-based catalysts as fuel electrodes for solid oxide electrochemical cells

Abstract

Demands for the development of active, stable nanoparticle-based alloys (NAs) as well as the effective approach to maintaining their nanoscale dimensions at high temperature are rapidly increasing for solid oxide electrochemical cells. While in situ exsolution from perovskite oxide can produce highly active and stable NAs, its composition flexibility is rather poor. Note that only the reducible cations, such as Ni, Co, Fe, Cu, and precious metals, can be exsolved. Infiltration technique allows us to develop NAs with new, complex compositions, but the derived NAs are more likely to aggregate into larger particles in comparison to the exsolved NAs. Here we report the synthesis of a novel CoMo NA with a double shell structure. Such a double shell structure may slowdown the atom diffusion rate, and thus benefit for enhancing the thermal stability of the CoMo NA. In addition, we construct a mosaic-like PrBaMn2O5+δ matrix to modify the Y2O3-stabilized-ZrO2 electrolyte scaffold. This rough, defect-rich matrix layer helps disperse and anchor the CoMo NAs and sets the stage for the synergetic catalysis. The composite electrode exhibits good reactivity, robustness and coking resistance in the fuel electrode for the hydrocarbon oxidation and CO2 splitting, showing the promise to replace the state-of-the-art counterparts. More generally, this work highlights a simple and viable pathway for enhancing the performance of solid oxide electrochemical cells as well as other high temperature (electro)catalysis reactions.

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Publication details

The article was received on 21 May 2018, accepted on 13 Jul 2018 and first published on 13 Jul 2018


Article type: Paper
DOI: 10.1039/C8TA04749A
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Thermally stable and coke resistant CoMo alloy-based catalysts as fuel electrodes for solid oxide electrochemical cells

    M. Li, B. Hua, Y. Zeng, B. Amirkhiz and J. Luo, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA04749A

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