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fenrirwen

金虫 (小有名气)

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注册: 2011-10-14
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专业: 金属功能材料

[求助] 钛纳米管的烧结

小弟是催化新手...
看到一篇文献  是在TIO2纳米管上沉积Cu后阳极氧化为Cu2O
里面提到在电沉积Cu前  需要在550℃氧气环境中将TIO2纳米管烧结5小时
请问烧结的原因是什么？  如果不烧结直接沉积Cu的话有什么缺点？

原文如下：
Preparation of TiO2NTArrays.
Titanium foils (250 μmthick,99.8%; Sigma Aldrich) were ultrasonically cleaned in acetone and ethanol prior to anodization. These foils were anodized at 30 V for 2 h in a two-electrode electrochemical cell in an ethylene glycol (EG) solution containing 0.3 wt % NH4F and 1% volume of H2O. The formed TiO2 NTs are 4 μm long (7).In all cases, a platinum foil was used as the counter electrode.The distance between the two electrodes was maintained at 2 cm. The as-anodized TiO2 NTs were sintered in oxygen atmosphere at 550 °C for 5 h before Cu0 deposition.
Fabrication of Cu2O/TiO2 Networks.
Cu crystals were electrodeposited on TiO2 NTs in a solution containing 5mM CuSO4 in a typical three electrochemical cell equipped with a Pt wire counter electrode and saturated calomel electrode (SCE) reference. The electrodeposition was carried out with a rectangular potential pulsed mode at a potential of -2.0V for 0.2 s, and then a potential of -0.00001 V for 1 s, with 100 pulses. The Cu loaded TiO2 NTs were then potentiostatically anodized in 0.5 M NaOH electrolyte at 0.5 V for 30 min at 25 °C to fabricate Cu2O materials on TiO2 NTs.

出自High Efficient Photocatalytic Degradation of p-Nitrophenol on a Unique Cu2O/TiO2 p-n Heterojunction Network Catalyst
LIXIA YANG SHENGLIAN LUO YUE LI YANXIAO QING KANG QINGYUN CAI
Environ. Sci. Technol. 2010, 44, 7641–7646

谢谢各位大虾！

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