钴析氧催化剂原位制备及其结合半导体硅的光解水制氢性能

doi:10.11944/j.issn.1000-0518.2015.05.140284

摘要/Abstract

摘要：

将发展成熟的硅光伏电池与析氧催化剂(OEC)结合,在近中性环境下光解水制备了氢气。采用原位制备方法,在硅光伏材料上电沉积钴形成无定形Co-OEC膜,有效促进光生电荷分离,实现了利用AM1.5组合滤波片模拟太阳光照射下水分解制氢气。结果表明,在K₂B₄O₇缓冲溶液(pH=9.2)中,0 V(vs NHE)电压下沉积400 s形成的无定形Co-OEC具有良好的催化析氧效果,在无外加电压且模拟太阳光照射下,析氧电流密度可达1.7×10^-2 A/cm²,产氧速率为1.28 mol/(h·m²),且具有良好的稳定性。

关键词: 半导体硅, 钴-析氧催化剂, 原位制备, 制氢, 近中性

Abstract:

Due to the earth-abundance and prevalence in photovoltaic industries, silicon was used as light-harvesting material to from a composite with amorphous cobalt oxides oxygen-evolving catalyst(OEC) to carry out the solar-driven water-splitting in near-neutral conditions for hydrogen production. The device can efficiently utilize the solar spectrum for the photon-charge conversion and allow water splitting. The Co-OEC prepared by electrolysis deposition for 400 s exhibits excellent oxygen evolution properties, with a current density of 1.7×10^-2 A/cm² and a oxygen evolution rate of 1.28 mol/(h·m²) in the potassium tetraborate buffer solution(pH=9.2) at 0 V vs.NHE under AM1.5 simulated sunlight.

Key words: semiconductor silicon, cobalt-oxygen-evolving catalyst, in situ preparation, hydrogen evolution, near-neutral

中图分类号:

马楠, 高国锋, 郝根彦, 赵强, 李晋平. 钴析氧催化剂原位制备及其结合半导体硅的光解水制氢性能[J]. 应用化学, 2015, 32(5): 576-582.

MA Nan, GAO Guofeng, HAO Genyan, ZHAO Qiang, LI Jinping. Cobalt Oxygen-evolving Catalysts Generated in Situ and Interfaced with Silicon-based Semiconductors for Solar Water Splitting[J]. Chinese Journal of Applied Chemistry, 2015, 32(5): 576-582.

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