Nickel oxide functionalized silicon for efficient photo-oxidation of water
Nickel oxide functionalized silicon for efficient photo-oxidation of water
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DOI：
10.1039/c2ee21708b
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发表时间：
2012-06
影响因子：
32.5
通讯作者：
K. Sun;Namseok Park;Zhelin Sun;Jigang Zhou;Jian Wang;Xiaolu Pang;Shaohua Shen;S. Noh;Yi Jing-Yi-J
中科院分区：
文献类型：
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作者：
K. Sun;Namseok Park;Zhelin Sun;Jigang Zhou;Jian Wang;Xiaolu Pang;Shaohua Shen;S. Noh;Yi Jing-Yi-J
我们报道了一种具有成本效益的溶胶-凝胶工艺制备的氧化镍（NiOx）薄膜，涂覆n型硅（n-Si）作为光阳极，用于在中性pH条件下对水进行有效的光氧化。NiOx薄膜有三个功能：(i)作为保护层，提高Si光电极的化学稳定性；（ii）作为析氧催化剂；（iii）提供结光电压，进一步降低过电位。析氧起始电位降至热力学水氧化水平以下，并在低过电位下观察到析氧。我们的研究结果证明了用低成本的NiOx和Si制造坚固的光电极，这使得太阳能水氧化具有高效率。
We report a nickel oxide (NiOx) thin film, from a cost-effective sol–gel process, coated n-type silicon (n-Si) as a photoanode for efficient photo-oxidation of water under neutral pH condition. The NiOx thin film has three functions: (i) serves as a protection layer to improve the chemical stability of the Si photoelectrode, (ii) acts as an oxygen evolution catalyst, and (iii) provides junction photovoltage to further reduce overpotential. The oxygen evolution onset potential is reduced to below the thermodynamic water oxidation level and oxygen evolution was observed at low overpotentials. Our results demonstrate the fabrication of robust photoelectrodes from low-cost NiOx and Si, which enable a practical solar water oxidation with high efficiency.