期刊
ACS APPLIED ENERGY MATERIALS
卷 5, 期 8, 页码 9297-9302出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.2c01765
关键词
antimony tin oxide; electrocatalyst; electrolysis; iridium oxide; microwave irradiation; nanoparticle; water oxidation; water splitting
资金
- Ministry of Trade, Industry and Energy, Korea [P0015313]
- Korea Evaluation Institute of Industrial Technology (KEIT) [P0015313] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Only a few materials can remain stable under acidic conditions, which limits the choice of catalysts and supports. The strong metal-support interaction in Ir/ATO structures, synthesized using the polyol process, can paradoxically deactivate the structures by causing reduction of the Sb dopant. This reduces the electrical conductivity of Ir/ATO and hinders electron transfer, deteriorating electrocatalytic activity towards OER.
Only a few materials can remain undissolved under working conditions for the oxygen evolution reaction (OER) in acidic media, which limits the choice of catalysts and supports. One of the practical catalyst/support candidates is IrOx/Sb:SnO2 (Ir/ATO) because both components are thermodynamically stable under low-pH anodic conditions. Moreover, between Ir and ATO, a strong metal- support interaction is present, thereby allowing for long-lasting OER activity unless the support degrades. However, we demonstrate that the strong interaction can paradoxically deactivate Ir/ATO structures when synthesizing them using the polyol process. We reveal that the strong interaction in the presence of polyol at elevated temperatures can cause the reduction of the Sb dopant to zero-valency. Findings show that the varied oxidation state of the dopant decreases the electrical conductivity of the Ir/ATO, impeding the electron transfer through the support, hence deteriorating electrocatalytic activity toward the OER.
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