Issue 10, 2022

Operando characterization of metallic and bimetallic electrocatalysts for SOFC fuel electrodes operating under internal methane reforming conditions

Abstract

Linear sweep voltammetry (LSV), electrochemical impedance spectroscopy (EIS) and operando Raman spectroscopy were used to study the electrochemical performance and carbon tolerance of SOFCs operating with niobium doped SrTiO3 (STN) anodes infiltrated with combinations of Ni, Co, and Ce0.8Gd0.2O2 (CGO) added to improve catalytic activity. Cell anodes were exposed to fuel feeds of humidified H2, pure CH4 and combinations of CO2 and CH4 at an operating temperature of 750 °C. Under pure CH4, Raman data show that carbon forms on all anodes containing Ni. In cells with CGO, deposited carbon results in a decreased polarization resistance. This behavior may be due to benefits conferred by CGO to the electrocatalytic activity of triple phase boundaries, presumably through improved oxide ion conductivity and/or due to carbon securing a better electrical connection in the electrodes. Raman spectra from Co-only containing anodes show no sign of carbon deposition. The absence of observable carbon together with low frequency processes observed in the EIS suggest that Co may play a role in oxidizing carbon before measurable amounts accumulate.

Graphical abstract: Operando characterization of metallic and bimetallic electrocatalysts for SOFC fuel electrodes operating under internal methane reforming conditions

Article information

Article type
Paper
Submitted
25 Aug. 2021
Accepted
04 Febr. 2022
First published
15 Febr. 2022

J. Mater. Chem. A, 2022,10, 5550-5560

Operando characterization of metallic and bimetallic electrocatalysts for SOFC fuel electrodes operating under internal methane reforming conditions

D. B. Drasbæk, M. M. Welander, M. L. Traulsen, B. R. Sudireddy, P. Holtappels and R. A. Walker, J. Mater. Chem. A, 2022, 10, 5550 DOI: 10.1039/D1TA07299D

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