用于太阳能水氧化的具有超薄 NiO(x) 的金属修饰 ITO 层保护的硅光阳极。

Si photoanode protected by a metal modified ITO layer with ultrathin NiO(x) for solar water oxidation.

机构信息

Department of Electrical and Computer Engineering, University of California, San Diego, 9500 Gilman Dr., La Jolla, California 92093, USA.

出版信息

Phys Chem Chem Phys. 2014 Mar 14;16(10):4612-25. doi: 10.1039/c4cp00033a.

DOI:10.1039/c4cp00033a

PMID:24458088

Abstract

We report an ultrathin NiOx catalyzed Si np(+) junction photoanode for a stable and efficient solar driven oxygen evolution reaction (OER) in water. A stable semi-transparent ITO/Au/ITO hole conducting oxide layer, sandwiched between the OER catalyst and the Si photoanode, is used to protect the Si from corrosion in an alkaline working environment, enhance the hole transportation, and provide a pre-activation contact to the NiOx catalyst. The NiOx catalyzed Si photoanode generates a photocurrent of 1.98 mA cm(-2) at the equilibrium water oxidation potential (EOER = 0.415 V vs. NHE in 1 M NaOH solution). A thermodynamic solar-to-oxygen conversion efficiency (SOCE) of 0.07% under 0.51-sun illumination is observed. The successful development of a low cost, highly efficient, and stable photoelectrochemical electrode based on earth abundant elements is essential for the realization of a large-scale practical solar fuel conversion.

摘要

我们报道了一种超薄 NiOx 催化的 Si np(+)结光阳极，用于在水中稳定高效地进行太阳能驱动的氧气析出反应（OER）。在 OER 催化剂和 Si 光阳极之间夹一层稳定的半透明 ITO/Au/ITO 空穴传输氧化物层，用于保护 Si 免受碱性工作环境中的腐蚀，增强空穴传输，并提供与 NiOx 催化剂的预激活接触。NiOx 催化的 Si 光阳极在平衡水氧化电位（EOER = 0.415 V vs. NHE 在 1 M NaOH 溶液中）下产生 1.98 mA cm(-2) 的光电流。在 0.51 倍太阳光照射下，观察到热力学太阳能到氧气的转化效率（SOCE）为 0.07%。基于丰富元素的低成本、高效和稳定的光电化学电极的成功开发对于实现大规模实际太阳能燃料转化至关重要。