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Low-loading of oxidized platinum nanoparticles into mesoporous titanium dioxide for effective and durable hydrogen evolution in acidic media
Arabian Journal of Chemistry ( IF 6 ) Pub Date : 2018-04-25
Mabrook S. Amer, Mohamed A. Ghanem, Abdullah M. Al-Mayouf, Prabhakarn Arunachalam, Nezar H. Khdary

Low-loading of oxidized platinum nanoparticles (0.1 – 0.5 wt.%) was incorporated into mesoporous titanium dioxide support (Ptx/meso-TiO2) via evaporation self-assembly (ESA) approach followed by a two-step calcination processes. The physicochemical characterizations showed that the oxidized Ptx/meso-TiO2 catalysts exhibit high surface area around 200 m2/g and Pt nanoparticles having an average size of 3.0 nm are uniformly incorporated into the mesoporous TiO2 matrix with the existence of Pt(II) and Pt(IV) oxidation states. The Ptx/meso-TiO2 electrocatalysts showed an enhanced electrocatalytic activity with hydrogen evolution onset potential at −10 mV vs. RHE, Tafel slope of −110 mV/dec, small charge transfer resistance, and mass activity that reaches up to 25.7 A/mgPt at −300 mV vs. RHE. The hydrogen evolution mass activity of Ptx/meso-TiO2 electrocatalysts is significantly more efficient than the commercial Pt/C catalysts and Pt nanoparticles supported on nanostructured carbon substrates. Moreover, the Ptx/meso-TiO2 electrocatalysts exhibit excellent durability for a 24-hour electrolysis in acid solution with a further current activation during the prolonged electrolysis. The enhanced mass activity and durability are attributed to the substrate mesoporosity, uniform distribution and strong bonding between the oxidized Pt nanoparticles and the TiO2 substrate. These results demonstrate the promise of the mesoporous TiO2 substrate modified with low loading of platinum nanoparticles for energy conversion technologies.



中文翻译:

将氧化铂纳米粒子低负载到介孔二氧化钛中,可在酸性介质中有效持久地释放氢气

通过蒸发自组装(ESA)方法将低负载的氧化铂纳米颗粒(0.1 – 0.5 wt。%)掺入介孔二氧化钛载体(Pt x / meso -TiO 2)中,然后进行两步煅烧工艺。物理化学表征表明,氧化铂X /内消旋-TiO 2种催化剂具有大约200米,高表面积2具有3.0纳米的平均尺寸/克和Pt纳米颗粒被均匀地引入到所述介孔的TiO 2矩阵有Pt的存在( II)和Pt(IV)的氧化态。Pt x /中-TiO 2电催化剂显示出增强的电催化活性,在-10 mV相对于RHE处有氢气析出开始电势,在-300 mV相对于RHE的Tafel斜率为-110 mV / dec,较小的电荷转移阻力,且质量活性高达25.7 A / mg Pt RHE Pt x / meso -TiO 2电催化剂的氢气析出质量活性比负载在纳米结构碳基材上的商用Pt / C催化剂和Pt纳米颗粒有效得多。此外,Pt x / meso -TiO 2电催化剂在酸性溶液中24小时电解具有出色的耐久性,并且在延长的电解过程中可以进一步激活电流。增强的质量活性和耐久性归因于基底介孔性,氧化的Pt纳米颗粒与TiO 2基底之间的均匀分布和牢固的键合。这些结果证明了用低载量的铂纳米颗粒改性的介孔TiO 2基材用于能量转换技术的前景。

更新日期:2018-04-25
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