| Summary: | 碩士 === 國立臺灣科技大學 === 化學工程系 === 105 === In this work, nanoflower-like ternary CuxSnSy (CTS) semiconductor were synthesized by a novel solvothermal approach. Based on the point of view of Cu-Sn-S phase diagram, atomic ratio and crystal strcture can be changed by tuning sulfur molar ratio of CTS during the procedure of synthesis. In order to ensure that CTS can be applied on carbon dioxide reduction reaction, the nanoflower-like CTS powder will be identified by some optical analysis to define its band gap and band edge. On the other hands, from the results of composition, crystal structure and other analysis can found that in the case of low sulfur condition is easier to produce secondary phase copper(I) sulfide (Cu2S) which can enhance CTS system to produce C1 product: methanol (CH3OH). Moreover, sulfonic group (SO3H) can appear in someparameter, which can be a proton donor and proton hoppingto help acetaldehyde (CH3CHO) to convert to ethanol (C2H5OH). In optimization ofthis study, it was found that CTS215(Cu:Sn:S = 2:1:5) after 300oC annealing treatment have the most suitable size of the nanoflower-like structure, it can produce three different products including methanol, acetaldehyde and ethanol, its quantum efficiency also can achieve 0.0471%. In the future, followed by the annealing treatment, surface area control, crystal orientation control of CTS photocatalyst might be a good way for further development of carbon dioxide reduction.
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