Self-Assembled Heteroepitaxial Oxide Nanocomposite for Photoelectrochemical Solar Water Oxidation.
Self-Assembled Heteroepitaxial Oxide Nanocomposite for Photoelectrochemical Solar Water Oxidation.
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DOI：
10.1021/acs.chemmater.6b00122
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发表时间：
2016-05-10
期刊：
影响因子：
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通讯作者：
MacManus-Driscoll JL
中科院分区：
文献类型：
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作者：
Cho S;Jang JW;Li L;Jian J;Wang H;MacManus-Driscoll JL
我们报告自发相有序异质外延SrTiO 3（STO）：ZnFe 2 O 4（ZFO）纳米复合薄膜，产生强烈增强的光电化学太阳能水氧化，增强光致电荷分离一致。STO：ZFO纳米复合材料在1.23 V下产生了0.188 mA/cm 2的增强的光电流密度，与可逆氢电极相比，其分别是普通STO膜和ZFO膜情况下在1个太阳照射下的7.9倍和2.6倍。光电极也产生了稳定的光电流和H2和O2的法拉第效率大于90%。入射光子到电流转换效率的测量，Tauc图，莫特-肖特基图，和电化学阻抗谱测量证明，强烈增强的光生电荷分离导致垂直对齐的伪单晶组件，外延异质结，和交错带对齐的纳米复合薄膜的组件。这项研究为高效的太阳能转换应用提供了一条全新的途径。
We report on spontaneously phase ordered heteroepitaxial SrTiO3 (STO):ZnFe2O4 (ZFO) nanocomposite films that give rise to strongly enhanced photoelectrochemical solar water oxidation, consistent with enhanced photoinduced charge separation. The STO:ZFO nanocomposite yielded an enhanced photocurrent density of 0.188 mA/cm2 at 1.23 V vs a reversible hydrogen electrode, which was 7.9- and 2.6-fold higher than that of the plain STO film and ZFO film cases under 1-sun illumination, respectively. The photoelectrode also produced stable photocurrent and Faradaic efficiencies of H2 and O2 formation that were more than 90%. Incident-photon-to-current-conversion efficiency measurements, Tauc plots, Mott–Schottky plots, and electrochemical impedance spectroscopy measurements proved that the strongly enhanced photogenerated charge separation resulted from vertically aligned pseudosingle crystalline components, epitaxial heterojunctions, and a staggered band alignment of the components of the nanocomposite films. This study presents a completely new avenue for efficient solar energy conversion applications.