Yuxi Shi , Qi Zhao , Bo Guan , Jiayin Li , Guanyue Gao , Jinfang Zhi
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引用次数: 2
Abstract
BiVO4 with a suitable energy band structure is one of the most promising substrates for photochemical water spitting, but a significance limitation is its severe recombination of photogenerated electron-hole pairs in the bulk. Herein, we present a strategy of incorporating an onion-like carbon (OLC) into bulk BiVO4 matrix to enhance its carrier separation. The OLC, with controlled sp2/sp3-carbon ratio, can facilitate the bulk charge separation and UV–vis light absorption of BiVO4. The carrier separation enhancement in BiVO4 is highly dependent on the sp2/sp3 ratio of OLC, which falls within the range of 3 % to 89 %. The BiVO4/OLC photoanode embedded by OLC with sp2-carbon content of 40 % exhibits the champion photocurrent density of 4.8 mA cm−2 (1.23 VRHE), compared to the pristine BiVO4 of 2.84 mA cm−2. This work not only demonstrates a strategy for enhancing the photocatalytic carrier separation of BiVO4 photoanode by incorporating OLC, but it also provides a comprehensive understanding of the function mechanism of carbon-based materials in photocatalysts.
具有合适能带结构的BiVO4是光化学吐水最有前途的衬底之一,但它的一个重要限制是它在体中光生电子-空穴对的严重复合。在此,我们提出了一种将洋葱样碳(OLC)加入到大块BiVO4基质中的策略,以增强其载流子分离。OLC控制sp2/sp3-碳比,有利于BiVO4的本体电荷分离和紫外-可见光吸收。BiVO4的载流子分离增强高度依赖于OLC的sp2/sp3比率,其范围在3% ~ 89%之间。由sp2-碳含量为40%的OLC包埋的BiVO4/OLC光阳极的光电流密度为4.8 mA cm−2 (1.23 VRHE),而原始BiVO4的光电流密度为2.84 mA cm−2。本研究不仅展示了加入OLC增强BiVO4光阳极光催化载体分离的策略,而且对碳基材料在光催化剂中的作用机理提供了全面的认识。
期刊介绍:
Applied Surface Science covers topics contributing to a better understanding of surfaces, interfaces, nanostructures and their applications. The journal is concerned with scientific research on the atomic and molecular level of material properties determined with specific surface analytical techniques and/or computational methods, as well as the processing of such structures.