Triblock polymer mediated synthesis of Ir―Sn oxide electrocatalysts for oxygen evolution reaction

Over the past several decades, tremendous effort has been put into developing cost-effective, highly active and durable electrocatalysts for oxygen evolution reaction (OER) in the proton exchange membrane water electrolyzer. This report explores an advanced and effective "soft" material-as...

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Bibliographic Details
Published in:Journal of power sources 2014-03, Vol.249, p.175-184
Main Authors: Li, Guangfu, Yu, Hongmei, Wang, Xunying, Yang, Donglei, Li, Yongkun, Shao, Zhigang, Yi, Baolian
Format: Article
Language:English
Subjects:
Catalysis
Catalysts: preparations and properties
Chemistry
Durability
Electrocatalysts
Electrochemistry
Electrolytic cells
Evolution
Exact sciences and technology
General and physical chemistry
Iridium
Membranes
Miscellaneous (electroosmosis, electrophoresis, electrochromism, electrocrystallization, ...)
Oxides
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
Tin
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Summary:Over the past several decades, tremendous effort has been put into developing cost-effective, highly active and durable electrocatalysts for oxygen evolution reaction (OER) in the proton exchange membrane water electrolyzer. This report explores an advanced and effective "soft" material-assistant method to fabricate Ir0.6Sn0.4O2 electrocatalysts with a 0.6/0.4 ratio of Ir/Sn in precursors. Adopting a series of characterization methods, the collective results suggest that the surfactant-material F127 content, as an important factor, can efficiently control the formation of Ir-Sn oxides with varying surface properties and morphologies, such as the grainy and rod-shaped structures. Associating with the half-cell and single electrolyzer, it is affirmed that the optimal ratio of (Ir + Sn)/F127 is 100 for the preparation of S100-Ir0.6Sn0.4O2 with obviously enhanced activity and sufficient durability under the electrolysis circumstances. The lowest cell voltages obtained at 80 degree C are 1.631 V at 1000 mA cm-2, and 1.820 V at 2000 mA cm-2, when applying S100-Ir0.6Sn0.4O2 OER catalyst and Ti-material diffusion layer on the anode side and Nafion registered 115 membrane. Furthermore, the noble-metal Ir loading in the same cell decreases to 0.77 mg cm-2. These results highlight that Ir-Sn oxide synthesized by the soft-material method is a promising OER electrocatalyst.
ISSN:0378-7753
1873-2755
DOI:10.1016/j.jpowsour.2013.10.088