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最新Nature material金刚石用于水相光催化N2还原制备NH3-好文顶起别下沉
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光催化氮气还原合成氨气一直是科学家梦寐以求的技术。虽然经过半个多世纪的研究，几乎没有进展。本文通过紫外光激发金刚石，实现了氮气的光催化还原。 题目：Photo-illuminated diamond as a solid-state source of solvated electrons in water for nitrogen reduction 摘要：The photocatalytic reduction of N2 to NH3 is typically hampered by poor binding of N2 to catalytic materials and by the very high energy of the intermediates involved in this reaction. Solvated electrons directly introduced into the reactant solution can provide an alternative pathway to overcome such limitations. Here we demonstrate that illuminated hydrogen-terminated diamond yields facile electron emission into water, thus inducing reduction of N2 to NH3 at ambient temperature and pressure. Transient absorption measurements at 632nm reveal the presence of solvated electrons adjacent to the diamond after photoexcitation. Experiments using inexpensive synthetic diamond samples and diamond powder show that photocatalytic activity is strongly dependent on the surface termination and correlates with the production of solvated electrons. The use of diamond to eject electrons into a reactant liquid represents a new paradigm for photocatalytic reduction, bringing electrons directly to reactants without requiring molecular adsorption to the surface严重鄙视只下载不评价  [ Last edited by cuiguanwei on 2013-9-26 at 08:28 ] |
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