在 BiVO4 光阳极上具有丰富氧空位的超薄 FeOOH 纳米层用于高效水氧化。
Ultrathin FeOOH Nanolayers with Abundant Oxygen Vacancies on BiVO Photoanodes for Efficient Water Oxidation.
机构信息
State Key Laboratory for Oxo Synthesis and Selective Oxidation, National Engineering Research Center for Fine Petrochemical Intermediates, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, 730000, Lanzhou, China.
State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province, and College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, 730000, China.
出版信息
Angew Chem Int Ed Engl. 2018 Feb 19;57(8):2248-2252. doi: 10.1002/anie.201712499. Epub 2018 Feb 1.
Photoelectrochemical (PEC) water splitting is a promising method for storing solar energy in the form of hydrogen fuel, but it is greatly hindered by the sluggish kinetics of the oxygen evolution reaction (OER). Herein, a facile solution impregnation method is developed for growing ultrathin (2 nm) highly crystalline β-FeOOH nanolayers with abundant oxygen vacancies on BiVO photoanodes. These exhibited a remarkable photocurrent density of 4.3 mA cm at 1.23 V (vs. reversible hydrogen electrode (RHE), AM 1.5 G), which is approximately two times higher than that of amorphous FeOOH fabricated by electrodeposition. Systematic studies reveal that the excellent PEC activity should be attributed to their ultrathin crystalline structure and abundant oxygen vacancies, which could effectively facilitate the hole transport/trapping and provide more active sites for water oxidation.
光电化学（PEC）水分解是一种将太阳能以氢气燃料形式储存的有前途的方法，但它受到析氧反应（OER）动力学缓慢的极大阻碍。在此，开发了一种简便的溶液浸渍法，在 BiVO 光阳极上生长具有丰富氧空位的超薄（2nm）高结晶β-FeOOH 纳米层。这些在 1.23V（相对于可逆氢电极 (RHE)，AM 1.5G）下表现出显著的光电流密度为 4.3mA/cm，约为电沉积制备的无定形 FeOOH 的两倍。系统研究表明，优异的 PEC 活性应归因于其超薄的结晶结构和丰富的氧空位，这可以有效地促进空穴输运/捕获并为水氧化提供更多的活性位点。
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