Visible Light Photocatalytic Activity of Pt/N‐TiO₂ towards Enhanced H₂ Production from Water Splitting

Abstract

Present work mainly focuses on experimental investigation to improvement of hydrogen production by water photoelectrolysis. An experimental facility was designed and constructed for visible light photocatalysis. A series of N-TiO 2 photocatalysts impregnated with platinum on the surface of N-TiO 2 were prepared. Hydrogen production upon irradiating aqueous Pt/N-TiO 2 suspension with visible light was investigated. The shift in excitation wavelength of TiO 2 was 380 nm improved the yield of hydrogen production by N-TiO 2 and Pt/N-TiO 2 . We used a 400 W mercury arc lamp combined with a 400 nm cutoff filter eliminating all the wavelengths under 400 nm. Pt/N-TiO 2 material was characterized with TPR, reflective UV/Visible spectroscopy and TEM. The best hydrogen production rate obtained for this setup for N/Ti = 10, 0.05 wt% Pt/N-TiO 2 , through water splitting was about 772 mmolh -1 g -1 .

Electronic Structure and Room Temperature Ferromagnetism in Gd‐doped Cerium Oxide Nanoparticles for Hydrogen Generation via Photocatalytic Water Splitting

“…Photocatalytic cleavage of the water for hydrogen generation was carried out using the powder of photocatalytic molecular device (0.3 g powder of Pt/CeO 2 or Pt/Gd x Ce 1− x O 2 or CeO 2 or Gd x Ce 1− x O 2 ) that was suspended in 120 mL of aqueous hole‐scavenger electrolyte (20% CH 3 OH; pH = 7.0) in a reaction cell, under the irradiation of 1 sun (100 mW cm −2 , AM1.5 G) visible light. The powder of the photocatalyst (0.2 g with and without Pt loading) was suspended in 120 mL of aqueous electrolyte (20% CH 3 OH pH = 7.0) in a double walled‐Pyrex glass reaction cell (volume ≈150 mL, with water jacket) that was sealed with a rubber septum and plastic wire lock . Prior to start the photochemical reaction, the suspension was continuously purged with Ar for 1 h by maintaining the 1 atm pressure of the inner jacket solution for expelling the air content from the solution.…”

Recent Progress of Ion-Modified TiO2 for Enhanced Photocatalytic Hydrogen Production

“…Although TiO 2 semiconductors have dominated the field of photocatalysis over the past few decades, the photocatalysts have two main drawbacks, the restricted absorption of photons in the VIS light region and the easy recombination of the photogenerated electron-hole pairs [104]. Various strategies have been suggested to overcome these pivotal shortcomings, including depositing metals on TiO 2 as co-catalysts to enhance the utilization of photogenerated charge carriers for increased activity [62,65,68,72] or as sensitizers that facilitate electron injection into the CB of TiO 2 for photocatalytic hydrogen production via the localized surface plasmon resonance (LSPR) effect [67,105]. When metal NPs are coupled with TiO 2 semiconductors via the metal deposition method, the Schottky junction is formed, and their light absorption range can be extended to VIS and even into the near-infrared region due to LSPR.…”

Anodized Iron Oxide Nanostructures on Different Carbon Steels for Photoelectrochemical Water Splitting

“…2 In order to improve PEC efficiency, many new semiconductor materials have been investigated and developed. [3][4][5][6][7][8][9][10][11][12][13][14] Among these investigated semiconducting materials, iron oxide had attracted increasing interest for PEC application due to its suitable band gap (~2.0 eV) for incident sunlight absorption (~40%), stability in electrolyte, low cost, non-toxic and environmental compatibility. 5,10,12,15 Methods to prepare iron oxide photoanode are versatile, including hydrothermal method, electrochemical process, sol-gel method and reactive-sputtering process.…”