期刊
SCIENCE ADVANCES
卷 2, 期 9, 页码 -出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.1501425
关键词
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资金
- NSF [DMR-1120901]
- Xi'an Jiaotong University, 973 Program of China [2012CB619402]
- National Natural Science Foundation of China [21371140]
- China National Funds for Excellent Young Scientists [21522106]
- U.S. Department of Energy, Office of Basic Energy Sciences [DE-SC0009565]
- U.S. Department of Energy (DOE) [DE-SC0009565] Funding Source: U.S. Department of Energy (DOE)
Methanol, which contains 12.6 weight percent hydrogen, is a good hydrogen storage medium because it is a liquid at room temperature. However, by releasing the hydrogen, undesirable CO and/or CO2 byproducts are formed during catalytic fuel reforming. We show that alkaline earth metal oxides, in our case MgO nanocrystals, exhibit stable photocatalytic activity for CO/CO2-free H-2 production from liquid methanol at room temperature. The performance of MgO nanocrystals toward methanol dehydrogenation increases with time and approaches similar to 320 mmol g(-1) hour(-1) after a 2-day photocatalytic reaction. The COx-free H-2 production is attributed to methanol photodecomposition to formaldehyde, photocatalyzed by surface electronic states of unique monodispersed, porous MgO nanocrystals, which were synthesized with a novel facile colloidal chemical strategy. An oxygen plasma treatment allows for the removal of organic surfactants, producing MgO nanocrystals that are well dispersible in methanol.
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