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標題:Electronically Coupled Uranium and Iron Oxide Heterojunctions as Efficient Water Oxidation Catalysts
學年108
學期1
出版(發表)日期2019/10/03
作品名稱Electronically Coupled Uranium and Iron Oxide Heterojunctions as Efficient Water Oxidation Catalysts
作品名稱(其他語言)
著者J. Leduc; Y. Gönüllü; T. Ruoko; T. Fischer; L. Mayrhofer; N. V. Tkachenko; C. L. Dong; A. Held; M. Moseler; S. Mathur
單位
出版者
著錄名稱、卷期、頁數Advanced Functional Materials 29(50), 1905005
摘要The most critical challenge faced in realizing a high efficiency photoelectrochemical water splitting process is the lack of suitable photoanodes enabling the transfer of four electrons involved in the complex oxygen evolution reaction (OER). Uranium oxides are efficient catalysts due to their wide range optical absorption (E g ≈ 1.8–3.2 eV), high photoconductivity, and multiple valence switching among uranium centers that improves the charge propagation kinetics. Herein, thin films of depleted uranium oxide (U3O8) are demonstrated grown via chemical vapor deposition effectively accelerate the OER in conjunction with hematite (α‐Fe2O3) overlayers through a built‐in potential at the interface. Density functional theory simulations demonstrate that the multivalence of U and Fe ions induce the adjustment of the band alignment subject to the concentration of interfacial Fe ions. In general, the equilibrium state depicts a type II band edge as the favored alignment, which improves charge‐transfer processes as observed in transient and X‐ray absorption (TAS and XAS) spectroscopy. The enhanced water splitting photocurrent density of the heterostructures (J = 2.42 mA cm−2) demonstrates the unexplored potential of uranium oxide in artificial photosynthesis.
關鍵字
語言英文
ISSN1616-3028
期刊性質國外
收錄於SCI;
產學合作
通訊作者
審稿制度
國別德國
公開徵稿
出版型式,電子版
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