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Constructing Highly Uniform Onion-Ring-like Graphitic Carbon Nitride for Efficient Visible-Light-Driven Photocatalytic Hydrogen Evolution
ACS Nano ( IF 15.8 ) Pub Date : 2018-06-04 00:00:00 , DOI: 10.1021/acsnano.8b01271 Lifeng Cui 1 , Jialing Song 1, 2 , Allister F. McGuire 3 , Shifei Kang 1 , Xueyou Fang 1 , Junjie Wang 1 , Chaochuang Yin 1 , Xi Li 2 , Yangang Wang 2 , Bianxiao Cui 3
ACS Nano ( IF 15.8 ) Pub Date : 2018-06-04 00:00:00 , DOI: 10.1021/acsnano.8b01271 Lifeng Cui 1 , Jialing Song 1, 2 , Allister F. McGuire 3 , Shifei Kang 1 , Xueyou Fang 1 , Junjie Wang 1 , Chaochuang Yin 1 , Xi Li 2 , Yangang Wang 2 , Bianxiao Cui 3
Affiliation
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The introduction of microstructure to the metal-free graphitic carbon nitride (g-C3N4) photocatalyst holds promise in enhancing its catalytic performance. However, producing such microstructured g-C3N4 remains technically challenging due to a complicated synthetic process and high cost. In this study, we develop a facile and in-air chemical vapor deposition (CVD) method that produces onion-ring-like g-C3N4 microstructures in a simple, reliable, and economical manner. This method involves the use of randomly packed 350 nm SiO2 microspheres as a hard template and melamine as a CVD precursor for the deposition of a thin layer of g-C3N4 in the narrow space between the SiO2 microspheres. After dissolution of the microsphere template, the resultant g-C3N4 exhibits uniquely uniform onion-ring-like microstructures. Unlike previously reported g-C3N4 powder morphologies that show various degrees of agglomeration and irregularity, the onion-ring-like g-C3N4 is highly dispersed and uniform. The calculated band gap for onion-ring-like g-C3N4 is 2.58 eV, which is significantly narrower than that of bulk g-C3N4 at 2.70 eV. Experimental characterization and testing suggest that, in comparison with bulk g-C3N4, onion-ring-like g-C3N4 facilitates charge separation, extends the lifetime of photoinduced carriers, exhibits 5-fold higher photocatalytic hydrogen evolution, and shows great potential for photocatalytic applications.
中文翻译：
构造高度均匀的洋葱环状石墨碳氮化物，以有效地进行可见光驱动的光催化氢生成
将微结构引入无金属石墨氮化碳（gC 3 N 4）光催化剂有望提高其催化性能。然而，由于复杂的合成过程和高成本，生产这种微结构化的gC 3 N 4仍然在技术上具有挑战性。在这项研究中，我们开发了一种简便的航空化学气相沉积（CVD）方法，该方法可以以简单，可靠和经济的方式产生类似洋葱环的gC 3 N 4微观结构。该方法涉及使用随机堆积的350 nm SiO 2微球作为硬模板，使用三聚氰胺作为CVD前体，以沉积gC 3 N薄层在SiO 2微球之间的狭窄空间中存在4。微球模板溶解后，所得的gC 3 N 4表现出独特的均匀的洋葱环状微结构。与先前报道的gC 3 N 4粉末形态显示出不同程度的团聚和不规则性不同，类似洋葱环的gC 3 N 4高度分散且均匀。洋葱状gC 3 N 4的带隙计算得出的带隙为2.58 eV，远小于块状gC 3 N 4的带隙。在2.70 eV。实验表征和测试表明，与块状gC 3 N 4相比，类似洋葱环的gC 3 N 4促进电荷分离，延长了光诱导载流子的寿命，展现出高出5倍的光催化氢放出，并显示出巨大的潜力。光催化应用。
更新日期：2018-06-04
中文翻译：
构造高度均匀的洋葱环状石墨碳氮化物，以有效地进行可见光驱动的光催化氢生成
将微结构引入无金属石墨氮化碳（gC 3 N 4）光催化剂有望提高其催化性能。然而，由于复杂的合成过程和高成本，生产这种微结构化的gC 3 N 4仍然在技术上具有挑战性。在这项研究中，我们开发了一种简便的航空化学气相沉积（CVD）方法，该方法可以以简单，可靠和经济的方式产生类似洋葱环的gC 3 N 4微观结构。该方法涉及使用随机堆积的350 nm SiO 2微球作为硬模板，使用三聚氰胺作为CVD前体，以沉积gC 3 N薄层在SiO 2微球之间的狭窄空间中存在4。微球模板溶解后，所得的gC 3 N 4表现出独特的均匀的洋葱环状微结构。与先前报道的gC 3 N 4粉末形态显示出不同程度的团聚和不规则性不同，类似洋葱环的gC 3 N 4高度分散且均匀。洋葱状gC 3 N 4的带隙计算得出的带隙为2.58 eV，远小于块状gC 3 N 4的带隙。在2.70 eV。实验表征和测试表明，与块状gC 3 N 4相比，类似洋葱环的gC 3 N 4促进电荷分离，延长了光诱导载流子的寿命，展现出高出5倍的光催化氢放出，并显示出巨大的潜力。光催化应用。
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