Abstract In order to reduce CO2 emissions and utilise CO2 as a useful by-product, artificial photosynthesis is being explored for carbon capture and utilisation. Semiconductor photocatalysts excited by solar energy may be used to convert CO2 to fuels or useful chemicals, e.g. CO, CH4, CH3OH. The photocatalytic reduction of CO2 to useful products has been widely studied in order to overcome the greenhouse effect and the current energy necessities. However, this reaction has proved to be extremely low efficiency when compared to other processes. In order to improve these yields, photoelectrochemical reduction of CO2 has been considered, since it combines photocatalysis and electrocatalysis. To this end, a two compartment photoelectrochemical cell (PEC) has been designed and fabricated for the reduction of CO2. This custom built reactor consists of dual phases, where gas phase CO2 is feed into the cathode compartment and an aqueous phase in the anode compartment. The anode and cathodes for a sandwich were the anode perforated foil on exposing aligned titania nanotubes to electrolyte bonded to nafion; which forms a bridge to Pt deposited carbon cloth cathode electrode in gas phase compartment. CO2 reduction products were detected with GC connected to the reactor. The PEC reactor improved the yield and the formal quantum efficiency compared to our previous studies using photocatalytic reactors.

中文翻译：

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用 TiNT 光电化学还原 CO2

摘要 为了减少 CO2 排放并利用 CO2 作为有用的副产品，人们正在探索人工光合作用进行碳捕获和利用。由太阳能激发的半导体光催化剂可用于将 CO2 转化为燃料或有用的化学品，例如 CO、CH4、CH3OH。为了克服温室效应和当前的能源需求，已广泛研究将 CO2 光催化还原为有用的产品。然而，与其他工艺相比，这种反应的效率极低。为了提高这些产率，已经考虑光电化学还原 CO2，因为它结合了光催化和电催化。为此，设计并制造了一个两室光电化学电池 (PEC) 以减少 CO2。这种定制的反应器由两相组成，其中气相 CO2 被送入阴极室，水相进入阳极室。夹层的阳极和阴极是阳极穿孔箔，将排列的二氧化钛纳米管暴露于与 nafion 结合的电解质；它在气相室中形成了与 Pt 沉积碳布阴极电极的桥接。用连接到反应器的 GC 检测 CO2 还原产物。与我们之前使用光催化反应器的研究相比，PEC 反应器提高了产量和形式量子效率。它在气相室中形成了与 Pt 沉积碳布阴极电极的桥接。用连接到反应器的 GC 检测 CO2 还原产物。与我们之前使用光催化反应器的研究相比，PEC 反应器提高了产量和形式量子效率。它在气相室中形成了与 Pt 沉积碳布阴极电极的桥接。用连接到反应器的 GC 检测 CO2 还原产物。与我们之前使用光催化反应器的研究相比，PEC 反应器提高了产量和形式量子效率。