Surface engineered doping of hematite nanorod arrays for improved photoelectrochemical water splitting.
Surface engineered doping of hematite nanorod arrays for improved photoelectrochemical water splitting.
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赤铁矿纳米棒阵列的表面工程掺杂可改善光电化学水分解
DOI：
10.1038/srep06627
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发表时间：
2014-10-15
影响因子：
4.6
通讯作者：
Mao SS
中科院分区：
文献类型：
--
作者：
Shen S;Zhou J;Dong CL;Hu Y;Tseng EN;Guo P;Guo L;Mao SS
考虑到窄的带隙能够实现优异的光吸收，增加的载流子密度和加速的表面氧化反应动力学成为改善赤铁矿（α-Fe 2 O3）光阳极上的水分解的光电化学性能的关键点。本研究采用一种简单、廉价的方法制备了核/壳结构的α-Fe 2 O3纳米棒阵列。通过超声处理Ag前驱体溶液中的溶液基β-FeOOH纳米棒，然后高温退火，沿α-Fe 2 O3纳米棒形成沿着的约2-3 nm厚度的Ag掺杂的薄覆盖层。所得的α-Fe 2 O3/AgxFe 2 − xO 3核/壳纳米棒膜作为光阳极表现出比原始α-Fe 2 O3纳米棒膜高得多的光电化学性能，特别是在可见光区域;在1.23 V vs. RHE（可逆氢电极）下，400 nm处的入射光电流效率（IPCE）从2.2%增加到8.4%。 Mott-Schottky分析和X射线吸收光谱表明，Ag掺杂不仅增加了近表面区域的载流子密度，而且加速了表面氧化反应动力学，协同作用有助于提高光电化学性能。这些发现为高效太阳能水分解的纳米结构光电极的设计和优化提供了指导。
Given the narrow band gap enabling excellent optical absorption, increased charge carrier density and accelerated surface oxidation reaction kinetics become the key points for improved photoelectrochemical performances for water splitting over hematite (α-Fe2O3) photoanodes. In this study, a facile and inexpensive method was demonstrated to develop core/shell structured α-Fe2O3 nanorod arrays. A thin, Ag-doped overlayer of ~2–3 nm thickness was formed along α-Fe2O3 nanorods via ultrasonication treatment of solution-based β-FeOOH nanorods in Ag precursor solution followed by high temperature annealing. The obtained α-Fe2O3/AgxFe2−xO3 core/shell nanorod films demonstrated much higher photoelectrochemical performances as photoanodes than the pristine α-Fe2O3 nanorod film, especially in the visible light region; the incident photon-to-current efficiency (IPCE) at 400 nm was increased from 2.2% to 8.4% at 1.23 V vs. RHE (Reversible hydrogen electrode). Mott-Schottky analysis and X-ray absorption spectra revealed that the Ag-doped overlayer not only increased the carrier density in the near-surface region but also accelerated the surface oxidation reaction kinetics, synergistically contributing to the improved photoelectrochemical performances. These findings provide guidance for the design and optimization of nanostructured photoelectrodes for efficient solar water splitting.
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影响因子：
3.7
作者：
Kronawitter, Coleman X.;Kapilashrami, Mukes;Mao, Samuel S.
通讯作者：
Mao, Samuel S.
DOI：
10.1016/0168-583x(94)00408-0
发表时间：
1995-05-01
影响因子：
1.3
作者：
POLLAK, M;GAUTIER, M;SAUNDERS, VR
通讯作者：
SAUNDERS, VR
溶液生长制备钛掺杂赤铁矿光电阳极的物理和光电化学表征
影响因子：
11.9
作者：
Shen, Shaohua;Kronawitter, Coleman X.;Mao, Samuel S.
通讯作者：
Mao, Samuel S.
表面调谐促进赤铁矿纳米棒阵列中的电荷转移作为水分解光电阳极
影响因子：
9.9
作者：
Shen, Shaohua;Kronawitter, Coleman X.;Guo, Liejin
通讯作者：
Guo, Liejin
DOI：
10.1073/pnas.1118326109
发表时间：
2012-09-25
影响因子：
11.1
作者：
Barroso, Monica;Mesa, Camilo A.;Durrant, James R.
通讯作者：
Durrant, James R.