Surface Water Loading on Titanium Dioxide Modulates Photocatalytic Water Splitting

Surface Water Loading on Titanium Dioxide Modulates Photocatalytic Water Splitting
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二氧化钛表面水负载调节光催化水分解

DOI:
10.1016/j.xcrp.2019.100013
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发表时间:
2020-02
影响因子:
8.9
通讯作者:
Feng Deng
Feng Deng
中科院分区:
综合性期刊2区
文献类型:
--
作者:
Longxiao Yang;Ningdong Feng;Qiang Wang;Yueying Chu;Jun Xu;Feng Deng

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尽管在过去的几十年里进行了大量的努力,但大多数现有的光催化剂都存在太阳能转换效率低的问题。在此,我们利用原位固体核磁共振和电子自旋共振(ESR)谱研究了Pt/TiO 2催化剂上水裂解的光催化机理。实验结果表明,H2和O2-的形成以及随后的O2-氧化表面分子都发生在助催化剂Pt上。传统方法在没有牺牲剂的情况下,O2-不可避免地会消耗邻近的H2来再生H2O。因此,我们提出了一种新的策略,通过控制水负载在TiO 2的表面上,这可以阻止H2与O2-相互作用,以再生H2O的纯水的光解。该策略的效率可达560 μ molH 2/g/h,总太阳能转换效率为0.46%,而传统方法的效率可以忽略不计。
Despite intense efforts during the past decades, most of the existing photocatalysts suffer from low solar energy conversion efficiency. Herein, we examine the photocatalytic mechanism of water splitting on Pt/TiO2catalysts usingin situsolid-state NMR and electron spin resonance (ESR) spectroscopy. The experimental results demonstrate that the formation of H2and O2−and the subsequent oxidization of surface molecules by O2−all occur on the co-catalyst Pt. It is inevitable that in the absence of sacrifice reagent, the O2−would consume neighboring H2to regenerate H2O in the traditional method. Accordingly, we propose a new strategy for the photolysis of pure water by controlling water loading on the surface of TiO2, which can hinder H2to interact with O2−to regenerate H2O. The efficiency of the strategy can reach ∼560 μmol H2/g/h, and the overall solar energy conversion efficiency is determined to be ∼0.46%, while those of the traditional method are negligible.
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