Improvement of ORR Activity and Durability of Pt Electrocatalyst Nanoparticles Anchored on TiO2/Cup-Stacked Carbon Nanotube in Acidic Aqueous Media
Improvement of ORR Activity and Durability of Pt Electrocatalyst Nanoparticles Anchored on TiO2/Cup-Stacked Carbon Nanotube in Acidic Aqueous Media
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DOI：
10.1016/j.electacta.2017.03.004
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发表时间：
2017-04-01
影响因子：
6.6
通讯作者：
Matsumoto, Futoshi
中科院分区：
文献类型：
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作者：
Ando, Fuma;Tanabe, Toyokazu;Matsumoto, Futoshi
铂纳米颗粒（Pt NP）已经通过光沉积选择性地锚定在氧化钛（TiO 2）基质上，所述氧化钛基质通过异丙醇中在杯堆叠的碳纳米管（CSCNT）上水解异丙醇钛形成，产生可用于酸性介质中的氧还原反应（ORR）的复合Pt催化剂，即，Pt NPs/TiO2/CSCNT。使用扫描透射电子显微镜（STEM）与高角度环形暗场（HAADF）检测器，它已被澄清，Pt纳米颗粒陷入TiO 2部分，并具有独特的多面体形状，主要由Pt（1 1 1）和Pt（1 0 0）方面包围。X射线光电子能谱（XPS）使我们能够确认的Pt纳米粒子和TiO 2支持的电子性质的变化，诱导的所谓的强金属-支持相互作用（SMSI）和显着增加的ORR活性达到0.1 M高氯酸，相比，Pt纳米粒子沉积在CB（Vulcan碳）和CSCNT。通过透射电子显微镜（TEM）表征Pt NP的表面结构，表明沉积在TiO 2/CSCNT上的Pt NP的耐久性提高，即，在耐久性试验后，颗粒尺寸仅有轻微增加（通常在0.1 M HClO 4中，在相对于RHE的0.05至1.1 V和1.0至1.5 V的电位范围内，在10 mV s（-1）下进行2000次电位循环）。获得的结果表明，Pt NP在沉积在CSCNT上的TiO 2载体材料上的锚定是通过SMSI增强Pt NP的ORR活性以及防止Pt NP聚集的有效方式，即，Pt NP的ORR活性的降低。(C)2017爱思唯尔有限公司版权所有
Platinum nanoparticles (Pt NPs) have been selectively anchored by photodeposition on titanium oxide (TiO2) matrix which is formed by hydrolysis of titanium isopropoxide on cup-stacked carbon nanotubes (CSCNT) in isopropanol, producing the composite Pt catalyst useful for oxygen reduction reaction (ORR) in acidic media, i.e., Pt NPs/TiO2/CSCNT. Using scanning transmission electron microscopy (STEM) with a high-angle annular-dark-field (HAADF) detector it has been clarified that Pt NPs are sunk into the TiO2 moieties and have the unique polyhedral shape surrounded mainly by the Pt (1 1 1) and Pt (1 0 0) facets. X-ray photoelectron spectroscopy (XPS) allowed us to confirm changes in electronic properties of both Pt NPs and TiO2 support, induced by the so-called strong metal-support interactions (SMSI) and the significantly increased ORR activity was attained in 0.1 M HClO4, compared with the Pt NPs deposited on CB (Vulcan carbon) and CSCNT. The surface structure of the Pt NPs was characterized by transmission electron microscopy (TEM), indicating the improved durability of the Pt NPs deposited on the TiO2/CSCNT, i.e., the only slight increase in the particle size after the durability test (typically 2000 times' potential cycling at 10 mV s(-1) in the potential ranges of 0.05 to 1.1 V and 1.0 to 1.5 V vs. RHE in 0.1 M HClO4). The results obtained demonstrate that the anchoring of Pt NPs on the TiO2 support material deposited on CSCNT is an effective way to enhance the ORR activity of Pt NPs by the SMSI as well as to prohibit Pt NPs from aggregating, i.e., the degradation of the ORR activity of Pt NPs. (C) 2017 Elsevier Ltd. All rights reserved.