Bandgap Modulation via Al Photodeposition on C-Doped g-C3N4 for Enhanced Photocatalytic Hydrogen Production

IF 3.8 3区 工程技术 Q2 ENGINEERING, CHEMICAL
Syed Aamir Hussain, Jun Hu, Fawad Aslam, Chenghui Hu, Hongyin Liu, Abid Ullah, Salman Khan, Feipeng Jiao
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Abstract

g-C3N4 has drawn more and more attention because of its visible-light activity, facile synthesis from easily available and low-cost precursor materials, chemical stability, and layered structure. However, the photocatalytic activity of a pure g-C3N4 photocatalyst is hindered by its narrow absorption range, small surface area, and fast electron–hole recombination rate. To cope with this issue, aluminum-deposited C-doped g-C3N4 (Aln/C7.5-MA) was synthesized by the polycondensation of melamine and sucrose, followed by in situ photodeposition of Al. The XPS and EDX analyses confirmed the successful deposition of Al nanoparticles over the C7.5-MA surface. The synthesized photocatalyst was employed to generate hydrogen (H2) via photocatalytic water splitting. Al10/C7.5-MA showed the most significant photocatalytic efficiency, achieving an H2 evolution rate of 14167 μmol g–1 h–1, which is 1.6 and 11.5 times greater than that of C-doped g-C3N4 and pristine g-C3N4, respectively. The comprehensive analysis demonstrated that C-doping followed by deposition of Al considerably narrowed its bandgap, expanded the light absorption range, boosted photoresponse, and improved photogenerated charge carrier separation due to the surface plasmon resonance (SPR) effect of Al. The findings emphasize the synergistic effect of C-doping and Al deposition in improving the photocatalytic ability of g-C3N4, presenting a viable approach for sustainable H2 production under visible-light irradiation.

Abstract Image

通过Al光沉积调制c掺杂g-C3N4的带隙增强光催化制氢
g-C3N4因其具有可见光活性、易获得且成本低廉的前驱体材料、化学稳定性和层状结构等优点而受到越来越多的关注。然而,纯g-C3N4光催化剂的吸收范围窄、比表面积小、电子-空穴复合速率快,阻碍了其光催化活性。为了解决这一问题,通过三聚氰胺和蔗糖的缩聚合成了铝沉积的c掺杂g-C3N4 (Aln/C7.5-MA),然后原位光沉积Al。XPS和EDX分析证实了在C7.5-MA表面成功沉积了Al纳米颗粒。将合成的光催化剂用于光催化水裂解制氢。Al10/C7.5-MA表现出最显著的光催化效率,H2的析出速率为14167 μmol g-1 h-1,分别是c掺杂g-C3N4和原始g-C3N4的1.6和11.5倍。综合分析表明,由于Al的表面等离子体共振(SPR)效应,c掺杂后Al沉积明显缩小了g-C3N4的带隙,扩大了光吸收范围,提高了光响应,并改善了光生载流子分离。研究结果强调了c掺杂和Al沉积在提高g-C3N4光催化能力方面的协同作用。提出了一种在可见光照射下可持续产氢的可行方法。
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来源期刊
Industrial & Engineering Chemistry Research
Industrial & Engineering Chemistry Research 工程技术-工程:化工
CiteScore
7.40
自引率
7.10%
发文量
1467
审稿时长
2.8 months
期刊介绍: ndustrial & Engineering Chemistry, with variations in title and format, has been published since 1909 by the American Chemical Society. Industrial & Engineering Chemistry Research is a weekly publication that reports industrial and academic research in the broad fields of applied chemistry and chemical engineering with special focus on fundamentals, processes, and products.
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