Electrochemical carbon deposition from CO2 on nickel and ceria electrodes studied by operando XPS

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The solid oxide electrochemical cell (SOC) is a promising candidate for large-scale renewable energy storage. By electrolysis of CO2 and H2O, synthesis gas can be produced with high efficiency and subsequently upgraded to green hydrocarbon fuels for use in existing fuel infrastructure and vehicles. However, in state-of-the-art SOCs, electrolysis of CO2 or CO2/H2O mixtures can lead to carbon deposition in the Ni-based fuel-electrode, eventually destroying the electrode. It is known that alternative electrocatalyst materials such as acceptor-doped ceria inhibit carbon deposition. However, the mechanisms by which electrochemical driven carbon deposition occurs or is inhibited are not understood. In this study we used operando X-ray photoelectron spectroscopy to probe the fundamental mechanisms of carbon deposition during electrochemical reduction of CO2 at 550 C and 500 mTorr pressure using model electrodes. The onset overpotential, role of surface adsorbates and intermediates, and reversibility of carbon deposition, were studied in detail on different electrode materials with electrical and spectroscopic measurements.
Original languageEnglish
JournalAmerican Chemical Society. Abstracts of Papers (at the National Meeting)
Volume253
Number of pages1
ISSN0065-7727
Publication statusPublished - 2018
Event253rd ACS National Meeting - San Francisco, California, United States
Duration: 2 Apr 20176 Apr 2017
Conference number: 253

Conference

Conference253rd ACS National Meeting
Number253
CountryUnited States
CitySan Francisco, California
Period02/04/201706/04/2017

Bibliographical note

Program area: Division of Catalysis Science and Technology, CATL 102

ID: 157145448