Hydrogen Productivity Analysis Using Low Concentration of TiO2–Au Nanoparticles on a Ultraviolet‐LED‐Based Photocatalytic Reactors. Issue 1 (25th November 2021)

• Record Type: Journal Article
• Authors: Varas-Concha, Felipe; Guzmán, Diego; Isaacs, Mauricio; Sáez-Navarrete, César
• Other Names: Scheffe Jonathan R. guestEditor.; Haussener Sophia guestEditor.; Patzke Greta R. guestEditor.
• Is Part Of: Energy technology. Volume 10:Issue 1(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-11-25
• Subjects: gold nanoparticles -- hydrogen -- low concentration photocatalysis -- photo-reforming of organic compounds -- titanium dioxide nanoparticles; Energy development -- Periodicals; Power resources -- Periodicals; 333.79
• DOI: 10.1002/ente.202100469
• Languages: English
• ISSNs: 2194-4288

Abstract

Abstract : The productivity of photocatalytic hydrogen generation via photo‐reforming of organic compounds has not been studied under low concentrations of catalyst, which could lead to relevant cost savings in future real‐scale applications. Herein, it uses half of the lowest concentration of nanoparticles reported of modified P25 TiO2 partially coated with gold. The nanomaterial is prepared using a non‐energy intensive, chemical reduction method. Gold content on the TiO2 surface is reported (14%—surface; 9.1%—weight). Dynamic light scattering and transmission electron microscope image analyses show low agglomeration and non‐homogeneous shape. Aggregates and gold nanoparticles reach average diameters of 92 and 3.8 nm, respectively. Photocatalytic experiments for hydrogen production are carried out at low concentration of nanoparticles (0.056 g L −1 ) in methanol–water solution (5%vol.) under 375 nm UV and visible light (20 mW cm −2 ). The system shows a catalyst productivity of 6661 μmol h −1 g −1, a third of the highest reported productivity using methanol (which used a catalyst concentration 18× higher, an alcohol concentration 5× higher, and 100% anatase). The system shows an estimated reaction rate of 373 μmol L −1 h −1 with an apparent zero order kinetic, an overall energy conversion efficiency of 0.47%, and an apparent quantum yield of 1.03%. Abstract : Exploring photocatalytic hydrogen production, via methanol reforming under ultraviolet LED light. Low catalyst concentration (0.056 g L −1 ) leads to good H2 productivity (6661 μmol h −1 g −1 ), an apparent zero‐order kinetic (373 μmol L −1 h −1 ), and low apparent quantum yield (1.03%). The system shows a third of the highest reported productivity using methanol (catalyst concentration 18× higher, alcohol concentration 5× higher, and 100% anatase).