Journal
CHEMICAL ENGINEERING JOURNAL
Volume 424, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.130350
Keywords
Hydrolysis of NaBH4; Co3O4; Reduced alpha-SiW12O40; Inorganic ligand effects; Hydrogen generation
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Funding
- Guangdong Basic and Applied Basic Research Foundation [2020A1515010865]
- National Natural Science Foundation of China (NSFC) [21506054]
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The study utilized RSTA as an inorganic ligand to enhance the catalytic performance of Co3O4 nanoparticles in the hydrolysis of NaBH4, inducing electronic and morphology effects to create more active sites, promoting hydrogen generation.
Despite substantial progress in various application fields of polyoxometalates (POMs), the use of POMs as ligands to alter the structure of solid catalysts in heterogeneous catalysis requires additional efforts. Herein, we used the reduced alpha-SiW12O404- (RSTA) as an inorganic ligand to mediate Co3O4 nanoparticles that efficiently promote the hydrolysis of NaBH4 to generate hydrogen with multiple activities (4747 mL/(g(cat).min)) compared with NaBH4-pretreated Co3O4 (1236 mL/(g(cat).min)), pristine Co3O4 (inactive) and commercial Co3O4 (inactive) at 25celcius. RSTA induced both electronic and morphology effects on Co3O4 through in situ driving 3D Co3O4 nanoparticles to 2D Co3O4 nanosheets with rich surface oxygen vacancies or Co2+ during the hydrolysis process. This modulation by RSTA allowed more active sites, including both electron-rich Co-0 and electron-deficient Co2+, facilitating BH4- and H2O adsorption and thus hydrogen generation. The promoted mechanism of the RSTA on both the microstructure and the catalytic performance was further proposed.
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