Photo-thermochemical Cycle for CO₂ Reduction based on Effective Ni ion Substitute-doped TiO₂

Abstract

摘要 利用溶胶凝胶法(Sol-gel)制备纯 TiO 2 (ST)及 Ni 掺杂 TiO 2 (NT)纳米薄膜, 将其应用在光热化学循环(PTC)还原 CO 2 中进行机理研究, 并与商用 P25 (PT)进行对比. 结果表明利用 NT 进行 CO 2 还原, 每个循环得到的平均 CO 产率最 高为 5.30 μmol/g-cat, 分别是利用 ST 与 PT 得到 CO 产率的 3.13 倍与 2.28 倍. 利用扫描电子显微镜(SEM)、透射电子 显微镜(TEM)、X 射线能量色散谱(EDXS)及 X 射线衍射技术(XRD)研究样品的物质组成、晶体结构与形貌.

Photo-thermochemical CO2 Splitting Based on Zinc-germanium Binary Oxide

“…除此以外, 当两种能带结构不同的半导 体接触时, 界面会形成异质结, 在两种材料之间形成内 建电场 [31] , 光生电子和空穴会在两种材料的能带之间 发生转移, 从而起到促进光生电子空穴复合或者扩展材 料光谱响应范围的作用 [32] . [33] . 当热反应温度大于 300 ℃时, 温度升高 CO 产 率增长不那么明显, 说明反应在大于 300 ℃条件下趋 于平衡, 因此在之后的实验中选择 350 ℃作为热反应 温度进行光热协同分解 CO 2 实验.…”

Enhanced Solar Conversion of CO2 to CO Using Mn‐doped TiO2 Based on Photo‐thermochemical Cycle

“…TiO 2 is the first metal oxide reported for photocatalysis, and shows nontoxicity, excellent stability and high resistance to corrosion as a promising photocatalyst . In our previous work, pure TiO 2 was utilized in the PTC for H 2 O and CO 2 decomposition, thereby verifying the feasibility of PTC, and we proposed that V O s play a key role in the PTC ,. However, pure TiO 2 can barely harvest the visible‐light spectrum, and the high rate of electron‐hole pair (EHP) recombination as well as the relatively high formation energy of V O s in TiO 2 decreases the energy conversion of photoreaction step .…”