Enhanced Oxygen Evolution Reaction Activity of Nanoporous SnO 2 /Fe 2 O 3 /IrO 2 Thin Film Composite Electrodes with Ultralow Noble Metal Loading

Sandra Haschke, Ying Zhuo, Stefanie Schlicht, Maïssa K.S. Barr, Ricarda Kloth, Maxime E. Dufond, Lionel Santinacci, Julien Bachmann

Результат исследований: Научные публикации в периодических изданияхстатьярецензирование

15 Цитирования (Scopus)

Аннотация

A conductive SnO 2 layer and small quantities of IrO 2 surface cocatalyst enhance the catalytic efficiency of nanoporous Fe 2 O 3 electrodes in the oxygen evolution reaction at neutral pH. Anodic alumina templates are therefore coated with thin layers of SnO 2 , Fe 2 O 3 , and IrO 2 by atomic layer deposition. In the first step, the Fe 2 O 3 electrode is modified with a conductive SnO 2 layer and submitted to different postdeposition thermal treatments in order to maximize its catalytic performance. The combination of steady-state electrolysis, electrochemical impedance spectroscopy, X-ray crystallography, and X-ray photoelectron spectroscopy demonstrates that catalytic turnover and e extraction are most efficient if both layers are amorphous in nature. In the second step, small quantities of IrO 2 with extremely low iridium loading of 7.5 µg cm −2 are coated on the electrode surface. These electrodes reveal favorable long-term stability over at least 15 h and achieve maximized steady-state current densities of 0.57 ± 0.05 mA cm −2 at η = 0.38 V and pH 7 (1.36 ± 0.10 mA cm −2 at η = 0.48 V) in dark conditions. This architecture enables charge carrier separation and reduces the photoelectrochemical water oxidation onset by 300 mV with respect to pure Fe 2 O 3 electrodes of identical geometry.

Язык оригиналаанглийский
Номер статьи1801432
Страницы (с-по)1801432
ЖурналAdvanced Materials Interfaces
Том6
Номер выпуска3
DOI
СостояниеОпубликовано - 8 фев 2019

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