Kim Jae Young, Magesh Ganesan, Youn Duck Hyun, Jang Ji-Wook, Kubota Jun, Domen Kazunari, Lee Jae Sung
Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), San 31, Hyoja-dong, Pohang 790-784, Republic of Korea.
Sci Rep. 2013;3:2681. doi: 10.1038/srep02681.
A hematite photoanode showing a stable, record-breaking performance of 4.32 mA/cm² photoelectrochemical water oxidation current at 1.23 V vs. RHE under simulated 1-sun (100 mW/cm²) irradiation is reported. This photocurrent corresponds to ca. 34% of the maximum theoretical limit expected for hematite with a band gap of 2.1 V. The photoanode produced stoichiometric hydrogen and oxygen gases in amounts close to the expected values from the photocurrent. The hematitle has a unique single-crystalline "wormlike" morphology produced by in-situ two-step annealing at 550°C and 800°C of β-FeOOH nanorods grown directly on a transparent conducting oxide glass via an all-solution method. In addition, it is modified by platinum doping to improve the charge transfer characteristics of hematite and an oxygen-evolving co-catalyst on the surface.
据报道，一种赤铁矿光阳极在模拟1个太阳（100 mW/cm²）光照下，相对于可逆氢电极（RHE）在1.23 V时展现出稳定的、创纪录的4.32 mA/cm²的光电化学水氧化电流性能。该光电流约相当于带隙为2.1 V的赤铁矿预期最大理论极限的34%。该光阳极产生的化学计量比的氢气和氧气量接近根据光电流预期的值。这种赤铁矿具有独特的单晶“蠕虫状”形态，它是通过全溶液法在透明导电氧化物玻璃上直接生长的β-FeOOH纳米棒在550°C和800°C原位两步退火制备而成。此外，通过铂掺杂对其进行改性，以改善赤铁矿的电荷转移特性以及表面析氧共催化剂的性能。
