Room-Temperature Hydrogen Uptake by TiO₂ Nanotubes

Abstract

TiO(2) nanotubes can reproducibly store up to approximately 2 wt % H(2) at room temperature and 6 MPa. However, only about 75% of this stored hydrogen can be released when the hydrogen pressure is lowered to ambient conditions, suggesting that both physisorption and chemisorption are responsible for the hydrogen uptake. FTIR spectroscopy, temperature-programmed desorption (TPD), and pressure-composition (P-C) isotherms suggest that 75% of the H(2) is physisorbed and can be reversibly released upon pressure reduction. Approximately 13% is weakly chemisorbed and can be released at 70 degrees C as H(2), and approximately 12% is bonded to oxide ions and released only at temperatures above 120 degrees C as H(2)O.

Effects of BaRuO3 addition on hydrogen desorption in MgH2

“…having multiple valence states in corresponding TMOs, show better reaction efficiency [7,21]. In addition, the interaction of H 2 with TMOs has drawn attention in order to understand their specific role on H 2 ab/desorption reactions in MgH 2 [27][28][29][30][31][32]. In particular, it has been suggested that the occurrence of a hydrogen absorption in the additive oxide phase may facilitate the overcome of the MgO layer formed at the surface of the MgH 2 particles, leading to an improved reaction kinetics [25,26].…”

Time Dependent Facile Hydrothermal Synthesis of TiO2 Nanorods and their Photoelectrochemical Applications

“…TiO 2 is a wide band gap (3.2 eV) transition metal oxide (TMO) semiconductor has received increasing attention due to its unique properties such as high chemical stability, high refractive index, optical transparency in UV and visible range, semiconducting behavior, photocatalytic activities, high PEC efficiency, biocompatibility, long term photostability, non-toxicity and low cost etc [1][2][3][4][5]. Because of all these properties TiO 2 become a common multifunctional material used in variety of applications in many fields such as dye sensitized solar cells [6], energy storage, gas sensors and biosensors [7], photocatalytic water splitting [8], photodegradation of organic pollutants, hydrogen generation [9,10], self-cleaning coatings [11], supercapacitors [12], electronic components [13], chemical catalysis [14], glass and ceramics [15], paintings, medicines, bactericides [16], cancer therapy [17] etc. Nanostructures of TiO 2 can exist in three crystal structures; two tetragonal forms (anatase and rutile) and one rhombic form (brookite).…”

The effect of TTNT nanotubes on hydrogen sorption using MgH2

“…The development of a nanocatalyst that combined with magnesium hydride can help to overcome such limitations is much studied nowadays. Nanotubes have been studied 1,2 for the past decade and showed to be effective catalysts for hydrogen storage using magnesium [3][4][5][6][7][8] . However, most of the studies reveal the use of carbon-based nanotubes and not much has been investigated on the use of nanotube made from titanium oxide.…”