Suppression of the water splitting back reaction on GaN:ZnO photocatalysts loaded with core/shell cocatalysts, investigated using a μ-reactor
Suppression of the water splitting back reaction on GaN:ZnO photocatalysts loaded with core/shell cocatalysts, investigated using a μ-reactor
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DOI：
10.1016/j.jcat.2012.03.021
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发表时间：
2012-08-01
影响因子：
7.3
通讯作者：
Chorkendorff, Ib
中科院分区：
文献类型：
--
作者：
Dionigi, Fabio;Vesborg, Peter C. K.;Chorkendorff, Ib
利用硅基p-反应器，研究了在同一催化剂上的光催化裂水反应和催化反反应。研究了在无助催化剂的情况下，负载Rh、Pt、Cr2O3/Rh、Cr2O3/Pt和Rh-Cr混合氧化物的GaN：ZnO气相光催化裂水反应。实验结果证实了以Cr2O_3/Rh和Rh-Cr混合氧化物为助催化剂的液相反应具有较高的活性。为了探讨活性增强的原因，通过反应化学计量比的H-2/O-2和监测生成的水分子来研究反应的返反应。两种实验的比较表明，核壳共催化剂和Rh-Cr复合氧化物对反反应的抑制与净光催化裂水活性的提高相对应。与Cr2O3Rh相比，Cr2O3Pt型催化剂并未完全抑制返反应，这可能是Cr2O3Rh净活性较高的原因。(C)2012 Elsevier Inc.保留所有权利。
Using silicon-based p-reactors, we have studied the photocatalytic water splitting reaction and the catalytic back reaction on the same catalysts. GaN:ZnO without cocatalyst and loaded with Rh, Pt, Cr2O3/Rh, Cr2O3/Pt, and Rh-Cr mixed oxide has been tested for gas-phase photocatalytic water splitting. The results confirm the high activity observed in liquid-phase experiments with Cr2O3/Rh and Rh-Cr mixed oxide as cocatalysts. To investigate the reason of this enhanced activity, the back reaction was studied by reacting stoichiometric H-2/O-2 and monitoring the water molecules produced. The comparison of the two experiments shows that the suppression of the back reaction with the core/shell cocatalysts and the Rh-Cr mixed oxide corresponds to an increase in the net photocatalytic water splitting activity. The fact that the back reaction is not completely suppressed with Cr2O3/Pt compared to Cr2O3/Rh may be the cause of the higher net activity of the Cr2O3/Rh. (C) 2012 Elsevier Inc. All rights reserved.