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首页> 外文期刊>Nanotechnology >Passivation of hematite nanorod photoanodes with a phosphorus overlayer for enhanced photoelectrochemical water oxidation
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Passivation of hematite nanorod photoanodes with a phosphorus overlayer for enhanced photoelectrochemical water oxidation

机译：带有磷覆盖层的赤铁矿纳米棒光阳极钝化，可增强光电化学水氧化

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摘要

Hematite (i.e., alpha-Fe2O3) nanorod photoanodes passivated with a phosphorus overlayer have been fabricated by decomposing sodium hypophosphite (NaH2PO2) at a low temperature over the hematite nanorod surface. Extensive scanning electron microscopy, transmission electron microscopy, x-ray diffractometry and UV-vis spectroscopy characterizations confirm that conformal deposition of an amorphous phosphorus overlayer does not change the crystal structure, morphology, and optical absorption properties of hematite photoanodes. X-ray photoelectron spectroscopy reveals that phosphorus in the deposited overlayer exists in an oxidized state. Comprehensive steady-state polarization, transient photocurrent response, and impedance spectroscopy measurements as well as Mott-Schottky analysis manifest that the phosphorus overlayer is able to effectively passivate surface states and suppress electron-hole recombination, substantially enhancing the photocurrent for water oxidation. Combining the phosphorization treatment with two-step thermal activation, a photocurrent density of 1.1 mA cm(-2) is achieved at 1.23 V versus reversible hydrogen electrode under illumination of 100mWcm(-2), ca 55 times higher than that of the non-activated pristine hematite photoanode measured under the same conditions. The simple and fast phosphorization strategy we present here can be readily applied to passivate surfaces of other semiconductor photoelectrodes to improve their photoelectrochemical performance.
机译：已经通过在低温下在赤铁矿纳米棒表面上分解次磷酸钠（NaH2PO2）来制造被磷覆盖层钝化的赤铁矿（即，α-Fe2O3）纳米棒光阳极。广泛的扫描电子显微镜，透射电子显微镜，x射线衍射和UV-vis光谱学表征证实，无定形磷覆盖层的保形沉积不会改变赤铁矿光阳极的晶体结构，形态和光吸收特性。 X射线光电子能谱显示沉积的覆盖层中的磷以氧化态存在。综合的稳态极化，瞬态光电流响应和阻抗谱测量以及Mott-Schottky分析表明，磷覆盖层能够有效地钝化表面态并抑制电子-空穴复合，从而大大增强了水氧化的光电流。将磷化处理与两步热激活相结合，在100mWcm（-2）的光照下，与可逆氢电极相比，在1.23 V的光电流密度为1.23 V cm（-2），比非可逆氢电极高约55倍。活化的原始赤铁矿光阳极在相同条件下测量。我们在此提出的简单而快速的磷化策略可以很容易地应用于其他半导体光电极的钝化表面，以改善其光电化学性能。

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