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Effects of Matching Facet Pairs of TiO2 on Photoelectrochemical Water Splitting Behaviors
ChemCatChem ( IF 3.8 ) Pub Date : 2020-03-12 , DOI: 10.1002/cctc.201901857 Chaiyasit Phawa 1, 2 , Sanchai Prayoonpokarach 2 , Kitiphat Sinthiptharakoon 1 , Pongkarn Chakthranont 1 , Weradesh Sangkhun 3 , Kajornsak Faungnawakij 1 , Teera Butburee 1
ChemCatChem ( IF 3.8 ) Pub Date : 2020-03-12 , DOI: 10.1002/cctc.201901857 Chaiyasit Phawa 1, 2 , Sanchai Prayoonpokarach 2 , Kitiphat Sinthiptharakoon 1 , Pongkarn Chakthranont 1 , Weradesh Sangkhun 3 , Kajornsak Faungnawakij 1 , Teera Butburee 1
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Engineering crystal facets have been proved as one of the most promising strategies for promoting photocatalytic performance of titanium dioxide (TiO2). The earlier research in this field focused on trying to obtain as high ratio of the high energy {001} facet as possible, while later found that the co‐existence of facets is more beneficial. However, controlling crystals to expose suitable facet pairs and facet ratios remains challenging. In this work, we not only comprehensively match possible low‐index facets such as {101}‐{001} and {010}‐{001} facet pairs, but also systematically tune their ratios. Moreover, these faceted particles can be directly grown onto the transparent conductive substrate, which can be directly used as a photoanode. So, their intrinsic behaviors can be precisely evaluated without interference from other exogenous factors such as binders, additives, or assembly skills. Various characterization techniques reveal that both the types of facet pairs and the ratios of facets play crucial roles on photocatalytic behaviors, due to the different electron affinity and dissociative adsorption ability of water molecules on a particular facet. Charge transport and surface chemistry have been thoroughly investigated to identify the underlying mechanism. This work sheds light on a material design strategy considering a suitable match of facet pairs for optimizing photocatalytic performance for a wide variety of applications.
中文翻译：
TiO2晶面配对对光电化学水分解行为的影响
工程晶体刻面已被证明是提高二氧化钛（TiO 2）。在该领域中，较早的研究着重于尝试获得尽可能高比例的高能量{001}切面，而后来发现切面的共存更为有益。然而，控制晶体以暴露合适的小平面对和小平面比率仍然具有挑战性。在这项工作中，我们不仅全面匹配了诸如{101}-{001}和{010}-{001}等方面对的低指数方面，而且系统地调整了它们的比率。而且，这些刻面颗粒可以直接生长在透明导电基板上，该透明导电基板可以直接用作光电阳极。因此，可以准确地评估其内在行为，而不会受到其他外在因素（例如粘合剂，添加剂或组装技能）的干扰。各种表征技术表明，由于特定刻面上水分子的电子亲和力和解离吸附能力不同，因此，刻面对的类型和刻面比率均对光催化行为起着至关重要的作用。已对电荷传输和表面化学进行了彻底研究，以确定其潜在机理。这项工作为材料设计策略提供了思路，其中考虑了合适的刻面对匹配，以优化各种应用的光催化性能。
更新日期：2020-04-22
中文翻译：
TiO2晶面配对对光电化学水分解行为的影响
工程晶体刻面已被证明是提高二氧化钛（TiO 2）。在该领域中，较早的研究着重于尝试获得尽可能高比例的高能量{001}切面，而后来发现切面的共存更为有益。然而，控制晶体以暴露合适的小平面对和小平面比率仍然具有挑战性。在这项工作中，我们不仅全面匹配了诸如{101}-{001}和{010}-{001}等方面对的低指数方面，而且系统地调整了它们的比率。而且，这些刻面颗粒可以直接生长在透明导电基板上，该透明导电基板可以直接用作光电阳极。因此，可以准确地评估其内在行为，而不会受到其他外在因素（例如粘合剂，添加剂或组装技能）的干扰。各种表征技术表明，由于特定刻面上水分子的电子亲和力和解离吸附能力不同，因此，刻面对的类型和刻面比率均对光催化行为起着至关重要的作用。已对电荷传输和表面化学进行了彻底研究，以确定其潜在机理。这项工作为材料设计策略提供了思路，其中考虑了合适的刻面对匹配，以优化各种应用的光催化性能。
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