鐵電材料CuInP2S6光催化二氧化碳還原反應探討

Abstract

隨著全世界工業蓬勃發展，二氧化碳排放造成氣候變遷已經成為一個不可忽視的議題，各國商討出的碳稅方案還不足以平衡日趨提升的全世界二氧化碳排放量，因此若能將結構穩定，不易分解的二氧化碳有效回收再製成其他有經濟價值的產物或許可以改善目前的窘況，而透過哪些特定材料並且能夠利用太陽光有效催化還原二氧化碳是目前很熱門的研究。在本研究中利用CuInP2S6作為光觸媒探討光催化二氧化碳還原反應。CuInP2S6是一種過渡金屬含磷硫族化物，作為二維材料家族，具有很多吸引人的特性，包括二維凡德瓦層狀結構、雙金屬活性位點、寬的吸收光波長範圍、鐵電性等，在本研究中我們探討了這些性質為此材料帶來高效的光催化展現以及獨特的烴類選擇性(一氧化碳:10.02 μmol g-1，甲烷:28.04 μmol g-1)，除此之外，本研究也在CuInP2S6中引入硫缺陷來探討缺陷工程導致電子特性改變的特質，並透過外加磁場產生的耦合作用改變電子自旋提升光生載子分離率，最終達到75.3 μmol g-1的高甲烷產率。With the vigorous development of industries around the world, climate change caused by carbon dioxide emissions has become an issue that cannot be ignored. The carbon tax plan is not enough to balance the increasing global carbon dioxide emissions. Effective reduction of carbon dioxide into other economically valuable products will be the way to improve the current predicament, Therefore, which materials can be used to catalyze carbon dioxide by using sunlight effectively has currently become very popular. In this study, the photocatalytic carbon dioxide reduction reaction was investigated using CuInP2S6 as a photocatalyst.CuInP2S6 is a Transition Metal Phosphorus Chalcogenide(TMPC), as a family of 2D materials, with many intriguing properties, like 2D van der Waals layered structure, bimetallic active sites, a wide range of light-adsorption wavelength, ferroelectricity, etc. In this study, these attractive properties bring the efficient photocatalytic display and unique hydrocarbon selectivity (CO: 10.02 μmol g-1, CH4: 28.04 μmol g-1) to this material. Furthermore, we introduced sulfur vacancies to CuInP2S6 and then explored the characteristics of electronic properties change caused by defect engineering. The electron spin was changed through the coupling effect generated by an external magnetic field to improve the separation rate of photogenerated carriers. Finally, a high yield of methane (75.3 μmol g-1) was achieved.