New Chemistry Unit, Chemistry and Physics of Materials Unit, CSIR- Centre of Excellence in Chemistry, International Centre for Materials Science and Sheikh Saqr Laboratory, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur PO, Bangalore 560064, India
New Chemistry Unit, Chemistry and Physics of Materials Unit, CSIR- Centre of Excellence in Chemistry, International Centre for Materials Science and Sheikh Saqr Laboratory, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur PO, Bangalore 560064, India.
Philos Trans A Math Phys Eng Sci. 2016 Feb 28;374(2061). doi: 10.1098/rsta.2015.0088.
Artificial photosynthesis to carry out both the oxidation and the reduction of water has emerged to be an exciting area of research. It has been possible to photochemically generate oxygen by using a scheme similar to the Z-scheme, by using suitable catalysts in place of water-oxidation catalyst in the Z-scheme in natural photosynthesis. The best oxidation catalysts are found to be Co and Mn oxides with the e(1) g configuration. The more important aspects investigated pertain to the visible-light-induced generation of hydrogen by using semiconductor heterostructures of the type ZnO/Pt/Cd1-xZnxS and dye-sensitized semiconductors. In the case of heterostructures, good yields of H2 have been obtained. Modifications of the heterostructures, wherein Pt is replaced by NiO, and the oxide is substituted with different anions are discussed. MoS2 and MoSe2 in the 1T form yield high quantities of H2 when sensitized by Eosin Y. Two-step thermochemical splitting of H2O using metal oxide redox pairs provides a strategy to produce H2 and CO. Performance of the Ln0.5A0.5MnO3 (Ln = rare earth ion, A = Ca, Sr) family of perovskites is found to be promising in this context. The best results to date are found with Y0.5Sr0.5MnO3.
人工光合作用能够同时进行水的氧化和还原，这已成为一个令人兴奋的研究领域。通过使用类似于 Z 方案的方案，在自然光合作用的 Z 方案中用合适的催化剂代替水氧化催化剂，可以实现光化学产生氧气。发现具有 e(1) g 构型的 Co 和 Mn 氧化物是最好的氧化催化剂。研究的更重要方面涉及使用 ZnO/Pt/Cd1-xZnxS 型半导体异质结构和染料敏化半导体通过可见光诱导产生氢气。在异质结构的情况下，已经获得了氢气的高产率。讨论了通过 NiO 代替 Pt 以及用不同阴离子取代氧化物对异质结构的修饰。当用曙红 Y 敏化时，1T 形式的 MoS2 和 MoSe2 会产生大量的 H2。使用金属氧化物氧化还原对两步热化学分解 H2O 提供了一种生产 H2 和 CO 的策略。在这种情况下，Ln0.5A0.5MnO3（Ln = 稀土离子，A = Ca，Sr）钙钛矿系列的性能被发现很有前途。迄今为止，最好的结果是在 Y0.5Sr0.5MnO3 中发现的。
