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Anodic TiO2 nanotubes decorated by Pt nanoparticles using ALD: An efficient electrocatalyst for methanol oxidation
Journal of Catalysis ( IF 7.3 ) Pub Date : 2018-07-02 , DOI: 10.1016/j.jcat.2018.06.017
V.C. Anitha , Raul Zazpe , Milos Krbal , JeongEun Yoo , Hanna Sopha , Jan Prikryl , Gihoon Cha , Stanislav Slang , Patrik Schmuki , Jan M. Macak

Anodic TiO2 nanotube layers (TNTs) of different thicknesses (≈1, 5 and 20 µm) were homogeneously decorated with Pt nanoparticles using atomic layer deposition (ALD) and explored for the electrocatalytic activity in methanol oxidation reaction (MOR). Six different numbers of ALD cycles (NALD) – 24, 40, 56, 72, 88 and 104 – were used. Pt nanoparticles with diameter in the range of 1.3–4.6 nm were obtained for the first five NALD and a complete coating was achieved for the highest NALD (1 0 4). The SEM/TEM analyses revealed that Pt nanoparticles uniformly decorated exteriors and interiors of TNTs. A linear increase of the particle diameter of Pt was observed with increasing NALD. Highest electrocatalytic activities of Pt/TNTs electrodes represented by current density of 74 mA/cm2 were obtained for NALD = 88 and for thickest TNTs (20 µm). The electrooxidation performance of Pt-decorated TiO2 nanotube layers was thoroughly compared to reference substrates: Pt-decorated graphite sheets and TiO2 flat layers (on annealed Ti foils) as well as for a commercial Pt/C catalyst attached on graphite sheets. From chronoamperometric measurements it turned out that the catalytic activity of Pt-loaded nanotube layers is superior and long lasting compared to other substrates, where significant degree of catalyst poisoning takes place. The presented ALD decoration approach is an effective strategy for the homogeneous distribution of precious Pt nanoparticles on a high surface area catalyst support for high-performance electrocatalysis.



中文翻译:

使用ALD的Pt纳米颗粒修饰阳极TiO 2纳米管:一种有效的甲醇氧化电催化剂

使用原子层沉积(ALD)用Pt纳米颗粒均匀装饰不同厚度(≈1、5和20 µm)的TiO 2阳极纳米管层(TNT),并研究其在甲醇氧化反应(MOR)中的电催化活性。使用了六个不同数量的ALD循环(N ALD)– 24、40、56、72、88和104。对于前五个N ALD,获得了直径在1.3-4.6 nm范围内的Pt纳米颗粒,并获得了最高N ALD(1 0 4)的完整涂层。SEM / TEM分析表明,Pt纳米颗粒均匀地装饰了TNT的外部和内部。随着N ALD的增加,Pt的粒径呈线性增加。对于N ALD  = 88和最厚的TNT(20 µm),获得了以74 mA / cm 2的电流密度表示的Pt / TNTs电极的最高电催化活性。将Pt装饰的TiO 2纳米管层的电氧化性能与参考基材进行了彻底比较:Pt装饰的石墨片和TiO 2平面层(在退火的Ti箔上),以及用于附着在石墨板上的商用Pt / C催化剂。从计时电流法测量结果可以看出,与其他基材相比,负载Pt的纳米管层的催化活性优越且持久,而其他基材会发生严重的催化剂中毒。提出的ALD装饰方法是一种有效的策略,可在高性能电催化的高表面积催化剂载体上均匀分布珍贵的Pt纳米颗粒。

更新日期:2018-07-02
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