Promotion of atomic hydrogen recombination as an alternative to electron trapping for the role of metals in the photocatalytic production of H2
Promotion of atomic hydrogen recombination as an alternative to electron trapping for the role of metals in the photocatalytic production of H2
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DOI：
10.1073/pnas.1405365111
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发表时间：
2014-06-03
影响因子：
11.1
通讯作者：
Zaera, Francisco
中科院分区：
文献类型：
--
作者：
Joo, Ji Bong;Dillon, Robert;Zaera, Francisco
在半导体光催化剂的表面添加少量的金属，可以促进半导体光催化剂从水中制氢。光催化活性的增强通常归因于由光子吸收产生的激发电子从半导体到金属的快速转移，这是防止去激发回到基态电子态的步骤。在这里，我们提供了实验证据，表明一种替代途径，不涉及电子转移到金属，但需要它作为催化剂的氢原子的重组，通过减少质子的表面上的半导体，而不是。
The production of hydrogen from water with semiconductor photocatalysts can be promoted by adding small amounts of metals to their surfaces. The resulting enhancement in photocatalytic activity is commonly attributed to a fast transfer of the excited electrons generated by photon absorption from the semiconductor to the metal, a step that prevents deexcitation back to the ground electronic state. Here we provide experimental evidence that suggests an alternative pathway that does not involve electron transfer to the metal but requires it to act as a catalyst for the recombination of the hydrogen atoms made via the reduction of protons on the surface of the semiconductor instead.