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

Cobalt Oxygen-evolving Catalysts Generated in Situ and Interfaced with Silicon-based Semiconductors for Solar Water Splitting

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,0V(vsNHE)电压下沉积400s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1.7×10-2A/cm2,产氧速率为1.28mol/(h·m2),且具有良好的稳定性。

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/cm^2 and a oxygen evolution rate of 1.28 moL/（h.m^2） in the potassium tetraborate buffer solution（pH =9.2） at 0 V vs. NHE under AMI. 5 simulated sunlight.