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Unusual Photoactive Water Oxidation Activity of Pt/PtOx Cocatalyst Decorated Crystalline α‐Fe2O3 Nanostructures: Exposed Facets Dependent Reactivity
ChemCatChem ( IF 3.8 ) Pub Date : 2020-03-10 , DOI: 10.1002/cctc.201902070 Astam K. Patra 1, 2 , Vipin Amoli 3 , Anil K. Sinha 3 , Dukjoon Kim 1
ChemCatChem ( IF 3.8 ) Pub Date : 2020-03-10 , DOI: 10.1002/cctc.201902070 Astam K. Patra 1, 2 , Vipin Amoli 3 , Anil K. Sinha 3 , Dukjoon Kim 1
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A key challenge remains the preparation of an active and robust water oxidation photocatalyst with abundant earth materials. As a useful to improve photocatalytic efficiency, the development of α‐Fe2O3 nanocrystals with different exposed facets and interfaces has attracted enormous attention. But literature survey shows that α‐Fe2O3 nanomaterials were mainly used in photoelectrochemical cell for water splitting as anode materials. In this work, highly efficient Pt/PtOx cocatalyst decorated α‐Fe2O3 shaped‐photocatalysts were derived as photocatalyst for white light‐induced O2 generation from water without any electric potential. The maximum apparent quantum efficiency of photooxidation reaction was reached 55.33 % by Pt/PtOx decorated bitruncated‐dodecahedron shaped α‐Fe2O3 and around 30.5, 2.3, 1.28 times better than the Pt/PtOx decorated nanocuboid, nanorod and bitruncated‐octahedron shape respectively. The Pt/PtOx decorated bitruncated‐dodecahedron shaped α‐Fe2O3 display an unusual photooxidation activity with a high TOF (1.96×10−2 s−1) due to presence of destabilized and unsaturated Fe centre containing high energy {104} and {100} facets. The present findings clearly demonstrate that the selective O2 evolution from water can possible without any sacrificial agent.
中文翻译：
Pt / PtOx助催化剂修饰的晶体α-Fe2O3纳米结构的不寻常的光活性水氧化活性：暴露的面取决于反应性
关键挑战仍然是如何使用丰富的土壤材料制备活性强壮的水氧化光催化剂。作为有用的，以提高光催化效率，α-Fe的发展2 ö 3纳米晶体具有不同的暴露面和接口已经引起极大的关注。但文献调查显示，的α-Fe 2个ö 3纳米材料主要用于在光电化学电池的水分解为阳极材料。在这项工作中，高效率的Pt / PtO的X助催化剂饰的α-Fe 2 ö 3成形-光催化剂被推导为光催化剂为白色光诱导ö 2没有任何电势的水发电。光氧化反应的最大表观量子效率通过的Pt / PtO的达到55.33％X装饰bitruncated-十二面体形状的的α-Fe 2 ö 3和周围30.5，2.3，比的Pt / PtO的更好1.28倍X饰nanocuboid，纳米棒和bitruncated-八面体形状。将Pt / PtO的X装饰bitruncated-十二面体形状的的α-Fe 2 ö 3显示一个不寻常的光氧化活性高TOF（1.96×10 -2 小号-1）是由于存在不稳定且不饱和的含高能{104}和{100}面的Fe中心。本发现清楚地表明，在没有任何牺牲剂的情况下，从水中选择性释放O 2是可能的。
更新日期：2020-04-22
中文翻译：
Pt / PtOx助催化剂修饰的晶体α-Fe2O3纳米结构的不寻常的光活性水氧化活性：暴露的面取决于反应性
关键挑战仍然是如何使用丰富的土壤材料制备活性强壮的水氧化光催化剂。作为有用的，以提高光催化效率，α-Fe的发展2 ö 3纳米晶体具有不同的暴露面和接口已经引起极大的关注。但文献调查显示，的α-Fe 2个ö 3纳米材料主要用于在光电化学电池的水分解为阳极材料。在这项工作中，高效率的Pt / PtO的X助催化剂饰的α-Fe 2 ö 3成形-光催化剂被推导为光催化剂为白色光诱导ö 2没有任何电势的水发电。光氧化反应的最大表观量子效率通过的Pt / PtO的达到55.33％X装饰bitruncated-十二面体形状的的α-Fe 2 ö 3和周围30.5，2.3，比的Pt / PtO的更好1.28倍X饰nanocuboid，纳米棒和bitruncated-八面体形状。将Pt / PtO的X装饰bitruncated-十二面体形状的的α-Fe 2 ö 3显示一个不寻常的光氧化活性高TOF（1.96×10 -2 小号-1）是由于存在不稳定且不饱和的含高能{104}和{100}面的Fe中心。本发现清楚地表明，在没有任何牺牲剂的情况下，从水中选择性释放O 2是可能的。
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