Optical Properties and Photocatalytic Performance of Si/TiO 2 Tandem Semiconductor Microwire Slurries
Optical Properties and Photocatalytic Performance of Si/TiO 2 Tandem Semiconductor Microwire Slurries
复制标题
Si/TiO 2 串联半导体微丝浆料的光学性质和光催化性能
DOI：
10.1021/acs.energyfuels.3c00568
复制
发表时间：
2023
期刊：
影响因子：
5.3
通讯作者：
Spurgeon, Joshua M.
中科院分区：
文献类型：
--
作者：
Gulati, Saumya;Mulvehill, Matthew C.;Thompson, Tyler C.;Spurgeon, Joshua M.
半导体粒子悬浮反应堆有望成为太阳能水分解的低成本策略，但它们面临着几个挑战，这些挑战抑制了它们的太阳能制氢（STH）效率。具有掩埋结的串联微粒解决了这些挑战中的一些，并提供了高STH效率的途径。作为浆料，串联微粒需要悬浮并良好分散，具有最大的光吸收，以获得最小的光活性颗粒浓度。在此，概念验证的Ni/np+-Si/FTO/TiO 2串联微丝结构能够独立的太阳能水分解进行了研究，作为一个浆料使用上升N2载气气泡。浆料的透射率，反射率和吸收率，其特征在于作为波长，气泡流量和串联微丝浓度的函数，使用积分球。值得注意的是，在仅1%的溶液体积填充有光敏材料的情况下实现了70-85%的浆料吸收率。浆料的光化学活性的特点是与原位监测的光降解的亚甲基蓝，包括颗粒浓度，气泡流量，光谱失配，混合光散射颗粒，和背反射器的影响。
Semiconductor particle suspension reactors hold promise as a possible low-cost strategy for solar water-splitting, but they face several challenges that have inhibited their solar-to-hydrogen (STH) efficiencies. A tandem microparticle with a buried junction addresses some of these challenges and offers a pathway to high STH efficiency. As a slurry, the tandem microparticles need to be suspended and well dispersed with maximum light absorption for a minimal photoactive particle concentration. Herein, proof-of-concept Ni/np+-Si/FTO/TiO2tandem microwire structures capable of unassisted solar water-splitting were investigated as a slurry using uplifting N2carrier gas bubbles. Transmittance, reflectance, and absorptance of the slurry were characterized as a function of wavelength, bubble flowrate, and tandem microwire concentration using an integrating sphere. Notably, a slurry absorptance of 70–85% was achieved with only 1% of the solution volume filled with a photoactive material. Photochemical activity of the slurry was characterized with in situ monitoring of the photodegradation of methylene blue, including the effects of particle concentration, bubble flowrate, spectral mismatch, intermixed light scattering particles, and a back reflector.