In:
Energy & Environmental Science, Royal Society of Chemistry (RSC), Vol. 15, No. 3 ( 2022), p. 1097-1105
Abstract:
Single-phase materials with mixed ionic and electronic conductivity underpin multiple solid-state electrochemical devices as promising electrodes. In particular, triple-conducting oxides that carry protons, oxygen ions, and electron holes simultaneously have ushered in a breakthrough in improving the performance of ceramic fuel cells, but insufficient electrochemical activity on their surface remains a challenge with regard to the development of related technologies. Here, we present a novel methodology that spontaneously yields transition metal nanocatalysts well dispersed on triple-conducting oxide surfaces realized by simply supplying water vapor with a room-temperature bubbler. The central idea underlying this strategy is the hydrogenation reaction that occurs in protonic ceramics containing redox-active transition metals and the subsequent selective surface phase decomposition. As a case study, Ag-substituted BaCo 0.4 Fe 0.4 Zr 0.1 Y 0.1 O 3− δ is chosen to exemplify the markedly enhanced electrode performance in a fuel cell. The water vapor generated during the operation induces the precipitation of Ag nanoparticles and significantly lowers the electrode resistance to a record level ( e.g. , 1.20 W cm −2 at 650 °C). These observations suggest a new design direction for oxide-supported catalysts with multiple charge carriers.
Type of Medium:
Online Resource
ISSN:
1754-5692
,
1754-5706
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2022
detail.hit.zdb_id:
2439879-2
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