Lu Xue, Liu Zhifeng
School of Materials Science and Engineering, Tianjin Chengjian University, 300384, Tianjin, China.
Dalton Trans. 2017 Jun 6;46(22):7351-7360. doi: 10.1039/c7dt01285c.
In this paper, CoO nanostructures with different morphologies (nanoparticles (NPs), nanosheets (NSs) and nanocubes (NCs)) are directly grown on an ITO substrate using a hydrothermal method. SbS is loaded onto CoO to construct a CoO/SbS heterojunction, which is used as an all p-type photocathode for photoelectrochemical (PEC) water splitting for the first time. The specific morphologies of CoO have been discussed in detail. The improved PEC properties of the CoO/SbS heterojunction are characterized. Among them, the outstanding photocurrent density of the CoO NC/SbS heterojunction photocathode is accessed by -1.32 mA cm at -0.4 V vs. RHE. The enhanced PEC properties result from more active sites of specific crystal planes, excellent optical performance, suitable band gradient alignment and increased charge separation and charge transfer rate.
在本文中，采用水热法在ITO衬底上直接生长出具有不同形貌（纳米颗粒（NPs）、纳米片（NSs）和纳米立方体（NCs））的CoO纳米结构。将SbS负载到CoO上以构建CoO/SbS异质结，该异质结首次用作光电化学（PEC）水分解的全p型光阴极。详细讨论了CoO的具体形貌。对CoO/SbS异质结改善的PEC性能进行了表征。其中，CoO NC/SbS异质结光阴极在相对于可逆氢电极（RHE）为-0.4 V时的出色光电流密度达到-1.32 mA cm⁻²。PEC性能的增强源于特定晶面更多的活性位点、优异的光学性能、合适的能带梯度排列以及电荷分离和电荷转移速率的提高。
