Enhanced Photocatalytic Water Splitting on Very Thin WO3 Films Activated by High-Temperature Annealing,ACS Catalysis

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Enhanced Photocatalytic Water Splitting on Very Thin WO3 Films Activated by High-Temperature Annealing
ACS Catalysis ( IF 11.3 ) Pub Date : 2018-10-08 00:00:00 , DOI: 10.1021/acscatal.8b03497
Aldona Jelinska ₁ , Krzysztof Bienkowski ₁ , Michal Jadwiszczak ₁ , Marcin Pisarek ₂ , Marcin Strawski ₃ , Dominik Kurzydlowski ₄ , Renata Solarska ₁ , Jan Augustynski ₁

Affiliation

Further advancement in sunlight-driven splitting of water as a means of producing hydrogen and oxygen is mainly hampered by the availability of easy-to-prepare, inexpensive n-type semiconductor materials able to operate as stable and efficient photoanodes in a water photoelectrolysis cell. Here, we demonstrate that photocatalytic water oxidation currents on thin-layer semitransparent WO₃ electrodes, deposited by using a one-step sol–gel method on conductive oxide F-SnO₂ substrates, are dramatically improved following additional higher-temperature (ca. 700 °C) annealing. Largely reduced recombination of charge carriers photogenerated in activated WO₃ associated with enhanced light absorption yields at 1.23 V vs RHE, under simulated solar AM 1.5G irradiation (100 mW cm^–2), water photo-oxidation currents close to 4.2 mA cm^–2 on a 1.2-μm-thick photoanode—approximately 2 times larger than on the electrodes of the same thickness only annealed at 550 °C. The relative enhancement of the photocurrent induced by the further annealing at 700 °C scaled up with decreasing the film thickness with a 3-fold increase observed for the thinnest tested, 0.25-μm-thick WO₃ electrode that reaches 2.75 mA cm^–2. We obtained such high photocatalytic water splitting performance without depositing any additional water oxidation catalyst.

中文翻译：

高温退火活化的非常薄的WO ₃薄膜上的增强光催化水分解

作为产生氢和氧的手段的阳光驱动的水的进一步发展主要受到易于制备的廉价n型半导体材料的阻碍，所述n型半导体材料能够在水光电解池中用作稳定和有效的光阳极。在这里，我们证明了通过一步法溶胶-凝胶法在导电氧化物F-SnO ₂衬底上沉积的薄层半透明WO ₃电极上的光催化水氧化电流，在额外的更高温度下（约700℃）得到了显着改善。 °C）退火。在活化的WO _3中光生的电荷载流子的重组大大减少与RHE相比，在1.23 V时具有更高的光吸收率，在模拟太阳能AM 1.5G辐照下（100 mW cm ^–2），在1.2μm厚的光电阳极上，水的光氧化电流接近4.2 mA cm ^–2，约为2在550°C退火的相同厚度的电极上，其厚度要比在相同厚度的电极上大10倍。在700°C下进一步退火所诱导的光电流的相对增强随着膜厚度的减小而增大，对于最薄的测试，厚度为0.25μm的WO ₃电极，观察到的最薄厚度达到了3.75 cm cm ^-2时，观察到的电流增加了3倍。我们获得了如此高的光催化水分解性能，而无需沉积任何其他的水氧化催化剂。

更新日期：2018-10-08

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