調控光陽極的晶系(crystal phase)被視為能有效改善光電化學性能的策略之一，本研究成功透過水熱法製備出兩種不同晶系組成的WO3光陽極，分別為具備純單斜晶系(monoclinic phase)的m-WO3和混合六方晶系(hexagonal phase)與單斜晶系的mixed-WO3¬，透過一系列的實驗分析使全方位地深入了解WO3光陽極的晶系組成在光電化學5-羥甲基糠醛氧化反應 (photoelectrochemical hydroxymethylfurfural oxidation reaction，PEC-HMFOR) 的影響。在模擬太陽光的照射條件，m-WO3表現出更好的催化活性，m-WO3的光電流密度(0.80 mA/cm2)在施加電位1.1 V vs. RHE處約是mixed-WO3 (0.18 mA/cm2)的4.4倍；除此之外，m-WO3的高經濟價值氧化產物產量(1.79 μmol/cm2)約是mixed-WO3 (0.72 μmol/cm2)的2.5倍。本研究發現具備純單斜晶系的m-WO3有更好的吸光能力與較快的電荷轉移能力並且能更有效率地將入射光轉換成光電流，這些優點都導致m-WO3能大幅地提升光電化學性能表現使其擁有較佳的催化活性；本項研究也是首次將WO3晶系工程應用於PEC-HMFOR，不只提出一個光電觸媒設計，同時也透過實驗參數的探討以提供出改善PEC-HMFOR的有效方針。

Modification of the crystal phase of photoanodes is regarded as one of effective strategies that can beneficially improve the photoelectrochemical performance. In this study, two WO3 photoanodes with different crystal phase compositions were successfully synthesized by the hydrothermal method, i.e. mixed-WO3 which is a mixture of hexagonal phase and monoclinic phase, and m-WO3 which is with pure monoclinic phase. A series of experiments were used to fully understand the effect of crystal phase engineering of WO3 on PEC-HMFOR. Under AM 1.5G irradiation, m-WO3 showed enhanced catalytic activity which recorded the higher photocurrent density (0.80 mA/cm2) at 1.1 V vs. RHE compared to mixed-WO3 (0.18 mA/cm2). In addition, the yield of highly value-added products of m-WO3 was about 2.5 times that of mixed-WO3. This study revealed that m-WO3 with pure monoclinic phase can more efficiently convert incident light into photocurrent and had better light harvesting, faster charge transfer kinetic, these advantages lead to m-WO3 can dramatically improve the photoelectrochemical performance. This is also the first study of crystal phase engineering of WO3 on PEC-HMFOR. It not only provides a new inspiration for photoanode design, but also provides an effective strategy to improve PEC-HMFOR by adjusting of experimental parameters.

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