Cr-Doped TiO2 Catalyzing Fast Hydrogen Absorption of MgH2 at Subzero Temperatures
By
Zhu, JJ (Zhu, Jiajing) [1] , [2] ; Wang, H (Wang, Hui) [1] , [2] ; Zhai, YQ (Zhai, Yuqi) [1] , [2] ; Huang, LJ (Huang, Liangjun) [1] , [2] ; Cui, J (Cui, Jie) [1] , [2] ; Ouyang, LZ (Ouyang, Liuzhang) [1] , [2] ; Zhu, M (Zhu, Min) [1] , [2] ; Huot, J (Huot, Jacques) [3]
(provided by Clarivate)
Source
ACS APPLIED ENERGY MATERIALS
Volume7Issue15Page6667-6676
DOI10.1021/acsaem.4c01283
Published
JUL 26 2024
Early Access
JUL 2024
Indexed
2024-08-06
Document Type
Article
Abstract
MgH2 is a promising solid-state hydrogen storage medium with a high hydrogen capacity and low cost, but it suffers from high hydrogen sorption temperatures. In this work, Cr-doped TiO2 solid solution nanocatalysts were synthesized and demonstrated to significantly reduce the hydrogen sorption temperatures and pressure of MgH2. The Ti(5Cr)O-2 catalyzed MgH2 releases over 6.1 wt % of H-2 at 200 degrees C, and even at 175 degrees C, 2.62 wt % H-2 can be desorbed. The dehydrogenation activation energy is greatly reduced to 85.3 +/- 8.7 kJ/mol, which is similar to 49.7 kJ/mol less than that observed for pure MgH2. The dehydrogenated product can absorb 4.5 wt % of H-2 within 10 s at a low temperature of -20 degrees C and back pressure of 30 bar, or the hydrogen uptake content can reach 4.81 wt % under 5 bar and 75 degrees C. The mechanism study indicates that the Cr-doped TiO2 can markedly reduce the adsorption energy and dissociation energy barrier of H-2 molecules and greatly enhance the dissociation ability of H on the catalyst surface. This work demonstrates the potential of modified TiO2 as a cost-effective and efficient catalyst for Mg-based hydrogen storage materials.
Keywords
Author Keywordshydrogen storage materialsMgH2catalysisTiO2Cr-doping
Keywords PlusSTORAGE PROPERTIESNANOPARTICLESKINETICSDEHYDROGENATIONTHERMODYNAMICSCATALYSISSORPTIONNBCU
Author Information
Corresponding Address
Wang, Hui
(corresponding author)
South China Univ Technol, Sch Mat Sci & Engn, Guangzhou 510640, Peoples R China
Corresponding Address
Wang, Hui
(corresponding author)
South China Univ Technol, Guangdong Prov Key Lab Adv Energy Storage Mat, Guangzhou 510640, Peoples R China
Affiliation
South China University of Technology
South China University of Technology Guangdong Provincial Key Laboratory of Advanced Energy Storage Materials
E-mail Addresses
mehwang@scut.edu.cn
Addresses
1 South China Univ Technol, Sch Mat Sci & Engn, Guangzhou 510640, Peoples R China
2 South China Univ Technol, Guangdong Prov Key Lab Adv Energy Storage Mat, Guangzhou 510640, Peoples R China
3 Univ Que?bec Trois Rivie`res, Hydrogen Res Inst, Dept Chem Biochem & Phys, Trois Rivie`res, PQ G9A 5H7, Canada
E-mail Addresses
mehwang@scut.edu.cn
Categories/ Classification
Research AreasChemistryEnergy & FuelsMaterials Science
Citation Topics
2 Chemistry
2.282 Hydrogen Chemistry & Storage
2.282.594 Hydrogen Storage
Sustainable Development Goals
07 Affordable and Clean Energy
Web of Science Categories
Chemistry, PhysicalEnergy & FuelsMaterials Science, Multidisciplinary