A facile, one-step electroless deposition of NiFeOOH nanosheets onto photoanodes for highly durable and efficient solar water oxidation
A facile, one-step electroless deposition of NiFeOOH nanosheets onto photoanodes for highly durable and efficient solar water oxidation
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DOI：
10.1039/c8ta07343k
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发表时间：
2018-10
影响因子：
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通讯作者：
M. Suryawanshi;S. Shin;U. Ghorpade;Jihun Kim;H. Jeong;S. Kang;J. H. Kim
中科院分区：
文献类型：
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作者：
M. Suryawanshi;S. Shin;U. Ghorpade;Jihun Kim;H. Jeong;S. Kang;J. H. Kim
通过设计完全由地球丰富元素组成的分级核/壳纳米结构光阳极，可以实现低成本、高效率和耐用的光电化学（PEC）水裂解系统。在本文中，我们报告了一种核/壳纳米结构光阳极的合理设计，该光阳极以TiO 2纳米棒（NR）阵列为核，以高活性地球丰富的NiFe羟基氧化物（（Ni 1-xFex）OOH，NiFeOOH）为壳，用于PEC水氧化。具体而言，NiFeOOH纳米片是通过一个简单的，一步无电沉积方法制备的，在室温下的短反应时间为10分钟。TiO 2/NiFeOOH核/壳纳米结构光阳极表现出前所未有的光电流密度增强（在1.23 V下相对于可逆氢电极（RHE）为3.85 mA cm-2），在24小时内光电流密度没有衰减，并且与TiO 2 NR相比（在1.23 V下相对于RHE为0.73 mA cm-2）具有133 mV的明显阴极起始电位偏移。通过电化学阻抗谱研究和计算的能带排列通过紫外光电子能谱表征的电子转移机制进行了讨论。这项工作不仅提出了一种简单的室温无电策略，用于将地球上丰富的催化剂与光阳极相结合，而且还加速了合理设计的核/壳光阳极的开发，以实现高效持久的太阳能水氧化。
A low-cost, highly efficient and durable photoelectrochemical (PEC) water-splitting system can be realized through designing a hierarchical core/shell nanostructured photoanode entirely composed of Earth-abundant elements. Herein, we report the rational design of a core/shell nanostructured photoanode with a TiO2 nanorod (NR) array as the core and a highly active Earth-abundant NiFe oxyhydroxide ((Ni1−xFex)OOH, NiFeOOH) oxygen evolution catalyst (OEC) as the shell for PEC water oxidation. Specifically, the NiFeOOH nanosheets were prepared via a facile, one-step electroless deposition method for a short reaction time of 10 min at room temperature. The TiO2/NiFeOOH core/shell nanostructured photoanode exhibits an unprecedented enhancement in photocurrent density (3.85 mA cm−2 at 1.23 V vs. a reversible hydrogen electrode, (RHE)), no decay in photocurrent density over 24 h, and an obvious cathodic onset potential shift of 133 mV compared to the TiO2 NRs (0.73 mA cm−2 at 1.23 V vs. RHE). The electron transfer mechanism is discussed through electrochemical impedance spectroscopy studies and calculated band alignments via ultraviolet photoelectron spectroscopy characterization. This work not only suggests a simple, room temperature electroless strategy for integrating Earth-abundant catalysts with photoanodes, but also accelerates the development of rationally designed core/shell photoanodes for efficient and durable solar water oxidation.