• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Advanced Functional Materials >Electronically Coupled Uranium and Iron Oxide Heterojunctions as Efficient Water Oxidation Catalysts
【24h】

Electronically Coupled Uranium and Iron Oxide Heterojunctions as Efficient Water Oxidation Catalysts

机译：电子耦合的铀和氧化铁异质结作为高效水氧化催化剂

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

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 approximate to 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 (alpha-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.
机译：实现高效光电化学水分解工艺面临的最关键挑战是缺少合适的光阳极，该光阳极能够转移参与复杂氧释放反应（OER）的四个电子。铀氧化物是有效的催化剂，因为它们具有宽范围的光吸收（E-g大约为1.8-3.2 eV），高光电导率以及铀中心之间的多价转换，从而改善了电荷传播动力学。在此，已证明贫化铀氧化物（U3O8）薄膜是通过化学气相沉积法生长的，与赤铁矿（α-Fe2O3）叠层膜一起通过界面处的内置电势有效地加速了OER。密度泛函理论模拟表明，U和Fe离子的多价态会引起界面铁离子浓度引起的能带排列调整。通常，平衡状态将II型谱带边缘描述为有利的排列，这可以改善瞬态和X射线吸收（TAS和XAS）光谱中的电荷转移过程。异质结构的增强的水分解光电流密度（J = 2.42 mA cm（-2））表明了在人工光合作用中未开发的铀氧化物的潜力。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号