All electrochemical fabrication of a bilayer membrane composed of nanotubular photocatalyst and palladium toward high-purity hydrogen production
All electrochemical fabrication of a bilayer membrane composed of nanotubular photocatalyst and palladium toward high-purity hydrogen production
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DOI：
10.1016/j.apsusc.2015.08.236
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发表时间：
2015-12
影响因子：
6.7
通讯作者：
M. Hattori;K. Noda
中科院分区：
文献类型：
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作者：
M. Hattori;K. Noda
我们开发了一种全电化学技术来制备双层结构的二氧化钛纳米管阵列(TNA)和钯薄膜(TNA/Pd膜)，用于光催化高纯度氢气的生产。采用化学镀的方法在钛箔阳极氧化制备的TNA表面沉积Pd膜。采用机械剥离方法将1μm厚的TNA转移到2μm厚的Pd薄膜上，制得了直径为1 5 cm、无针孔的3μm厚TNA/Pd薄膜。这种具有足够机械稳定性的超薄膜在TNA一侧显示出在紫外光照射下通过甲醇重整生成H_2的光催化反应，然后立即通过Pd层净化生成的H_2气体。考察了TNA/Pd膜在甲醇/水体系中制氢的产氢速率和表观量子产率。这项工作表明，化学镀钯比钯溅射更适合于制备有序的TNA/Pd异质界面。
We developed an all-electrochemical technique for fabricating a bilayer structure of a titanium dioxide (TiO2) nanotube array (TNA) and a palladium film (TNA/Pd membrane), which works for photocatalytic high-purity hydrogen production. Electroless plating was used for depositing the Pd film on the TNA surface prepared by anodizing a titanium foil. A 3-μm-thick TNA/Pd membrane without any pinholes in a 1.5-cm-diameter area was fabricated by transferring a 1-μm-thick TNA onto an electroless-plated 2-μm-thick Pd film with a mechanical peel-off process. This ultrathin membrane with sufficient mechanical robustness showed photocatalytic H2production via methanol reforming under ultraviolet illumination on the TNA side, immediately followed by the purification of the generated H2gas through the Pd layer. The hydrogen production rate and the apparent quantum yield for high-purity H2production from methanol/water mixture with the TNA/Pd membrane were also examined. This work suggests that palladium electroless plating is more suitable and practical for preparing a well-organized TNA/Pd heterointerface than palladium sputter deposition.