Cobalt oxide as a selective co-catalyst for water oxidation in the presence of an organic dye†,Photochemical & Photobiological Sciences

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Cobalt oxide as a selective co-catalyst for water oxidation in the presence of an organic dye†
Photochemical & Photobiological Sciences ( IF 2.7 ) Pub Date : 2017-10-16 00:00:00 , DOI: 10.1039/c7pp00320j
K. Kinastowska _{1,

2,

3,

4} , J. Barroso _{5,

6,

7} , L. Yate _{5,

6,

7} , V. Pavlov _{5,

6,

7} , A. Chuvilin _{7,

8,

9,

10,

11} , W. Bartkowiak _{1,

2,

3,

4} , M. Grzelczak _{7,

10,

11,

12,

13}

Affiliation

In photobiocatalytical processes involving the simultaneous oxidation of water and reduction of specific organic molecules (e.g., cofactors), the lack of physical separation of the redox half-reactions adversely affects the product stability. This is largely because organic molecules are generally less stable within harsh oxidative environments. In general, surface co-catalysts are able to improve the selectivity of photocatalysts towards water oxidation. However, harsh oxidative environments reduce the chemical stability of the organic molecules. Herein, we show that the use of Co₃O₄ as a surface co-catalyst on silver orthophosphate improve water photo-oxidation in the presence of organic dye molecules, such as methylene blue, that typically exhibits susceptibility toward photodegradation. The presence of Co₃O₄ on the photocatalyst surface prevents the adsorption of the organic dye, thus reducing its degradation rate. These findings provide a promising scenario for the visible light-driven reduction of organic molecules using water as an electron donor.

中文翻译：

氧化钴在有机染料存在下作为水氧化的选择性助催化剂†

在涉及水同时氧化和特定有机分子（例如辅因子）还原的光生物催化过程中，缺乏氧化还原半反应的物理分离会不利地影响产品的稳定性。这主要是因为有机分子在恶劣的氧化环境中通常不稳定。通常，表面助催化剂能够改善光催化剂对水氧化的选择性。然而，苛刻的氧化环境降低了有机分子的化学稳定性。在这里，我们表明使用Co ₃ O ₄在有机染料分子（例如亚甲基蓝）的存在下，正磷酸银表面助催化剂作为一种表面助催化剂可改善水的光氧化作用，而有机染料分子通常表现出对光降解的敏感性。Co ₃ O ₄在光催化剂表面上的存在阻止了有机染料的吸附，从而降低了其降解速率。这些发现为使用水作为电子给体的可见光驱动的有机分子还原提供了一个有希望的方案。

更新日期：2017-10-16

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