分會(huì)

第四十六分會(huì)：納米材料的合成與組裝

摘要

直接Z型光催化體系模擬光合作用的光生載流子傳輸方式，有效促進(jìn)了光生載流子的分離，從而提升催化劑的光催化制氫性能。在本工作中，我們以WO3納米棒（NRs）和四吡啶基鋅卟啉單體分別為成核模板和組裝單元，通過(guò)簡(jiǎn)單的酸堿中和膠束限域組裝的方法實(shí)現(xiàn)了ZnTPyP組裝體/WO3納米棒異質(zhì)納米棒-棒結(jié)構(gòu)(ZnTPyP/WO3)。ZnTPyP通過(guò)N-W配位在WO3納米棒上實(shí)現(xiàn)了可控組裝，ZnTPyP/WO3復(fù)合材料的光催化制氫速率表現(xiàn)出了高的結(jié)構(gòu)依賴性。在以Pt為助催化劑時(shí)，ZnTPyP/WO3表現(xiàn)出了最佳的產(chǎn)氫速率（74.53 mmol g-1 h-1），是ZnTPyP自組裝納米棒的2.64倍。ZnTPyP/WO3光催化制氫效率的提高主要?dú)w因于WO3和ZnTPyP之間的直接Z型電子轉(zhuǎn)移機(jī)制。本研究首次報(bào)道了使用卟啉組裝納米結(jié)構(gòu)構(gòu)建有機(jī)-無(wú)機(jī)Z型異質(zhì)光催化劑的方法，為基于有機(jī)超分子有序聚集體材料制備新型高效光催化劑提供了有價(jià)值的信息。 The direct Z-scheme photocatalytic system can effectively improve the separation efficiency of photogenerated carriers through the photosynthesis-based photocarrier transport model. In this study, zinc porphyrin-assembled nanorods (ZnTPyP) and WO3 nanorods’ nanorod-on-nanorod heterojunctions (ZnTPyP/WO3) were successfully prepared through a simple modified acid–base neutralization micelleconfined assembly method using WO3 nanorods as the nucleation template and ZnTPyP as building blocks. ZnTPyP achieved a controllable assembly onto WO3 nanorods through N–W coordination. ZnTPyP/WO3 nanorod-on-nanorod heterojunctions exhibited a structure-dependent photocatalytic performance for hydrogen production. The ZnTPyP/WO3 nanorod-on-nanorod heterojunctions exhibited a optimal hydrogen production rate (74.53 mmol g?1 h?1) using Pt as the co-catalyst, which was 2.64 times that of the ZnTPyP self-assembled nanorods. The improvement in the photocatalytic hydrogen production efficiency could be mainly attributed to the direct Z-scheme electron-transfer mechanism from WO3 to ZnTPyP. This is the first report of an approach using porphyrin-assembled nanostructures to construct organic–inorganic Z-scheme photocatalysts. This study offers valuable information for preparing new efficient photocatalysts based on organic supramolecular orderly aggregate materials.

關(guān)鍵詞

卟啉;可控共組裝;直接Z型光催化體系;光催化制氫

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