Wang Yen-Zen, Ko Tsung-Han, Huang Wen-Yao, Hsieh Tar-Hwa, Ho Ko-Shan, Chen Yi-Yin, Hsieh Siang-Jhih
Department of Chemical and Materials Engineering, National Yun-Lin University of Science and Technology,123, Univ. Rd., Sec. 3, Douliou, Yun-Lin 64002, Taiwan.
Department of Photonics, National Sun Yat-sen University, 70 Lienhai Rd., Kaohsiung 80424, Taiwan.
Polymers (Basel). 2018 Dec 14;10(12):1388. doi: 10.3390/polym10121388.
The Pt elements are prepared via the redox reaction with microwave (MW) irradiation in the presence of poly(p-phenylenediamine) (PpPD) which is polymerized on XC72 carbon matrix (PpPD/XC72), behaving as reducing agent. The free primary amines of PpPD are actually converted (oxidized) to secondary ones (5,10-dihydrophenazine) after MW irradiation. Transmission electronic microscopy (TEM) micrographs reveal the prepared Pt nanoparticles are well-dispersed on the carbon matrix like commercial Pt-implanted carbon nanocomposite (Pt/C). From the residue weights of thermogravimetric analysis (TGA) thermograms of Pt-loaded PpPD/XC72 (PpPD/XC72-Pt-MW), more Pt (18.49 wt %) nanoparticles are implanted on PpPD/XC72 composite. The Pt-implanted wt % on PpPD/XC72 matrix is just slightly lower than that of commercial Pt/C (22.30 wt %). The Pt-catalyst supports of PpPD/XC72-Pt-MW illustrate typical cyclic voltammograms (C-V) of Pt-catalyst, including significant Pt⁻H oxidation and Pt⁻O reduction peaks. The electrochemical active surface area of PpPD/XC72-Pt-MW is found to be as high as 60.1 m² g. Max. number of electron transfer during oxygen reduction reaction (ORR) approaches 3.83 for PpPD/XC72-Pt-MW, higher than that of commercial Pt/C (3.62). Single cell based on PpPD/XC72-Pt-MW demonstrates much higher specific max. power density to be 34.6 mW cm Pt, higher than that single cell prepared with commercial Pt/C electrode (30.6 mW cm Pt).
通过在聚（对苯二胺）（PpPD）存在下进行微波（MW）辐照的氧化还原反应制备Pt元素，PpPD在XC72碳基质（PpPD/XC72）上聚合，作为还原剂。MW辐照后，PpPD的游离伯胺实际上转化（氧化）为仲胺（5,10-二氢吩嗪）。透射电子显微镜（TEM）显微照片显示，制备的Pt纳米颗粒像商业Pt植入碳纳米复合材料（Pt/C）一样很好地分散在碳基质上。从负载Pt的PpPD/XC72（PpPD/XC72-Pt-MW）的热重分析（TGA）热重图的残留重量来看，更多的Pt（18.49 wt%）纳米颗粒被植入到PpPD/XC72复合材料上。PpPD/XC72基质上植入的Pt重量百分比略低于商业Pt/C（22.30 wt%）。PpPD/XC72-Pt-MW的Pt催化剂载体显示出典型的Pt催化剂循环伏安图（C-V），包括显著的Pt-H氧化峰和Pt-O还原峰。发现PpPD/XC72-Pt-MW的电化学活性表面积高达60.1 m²/g。对于PpPD/XC72-Pt-MW，氧还原反应（ORR）过程中的最大电子转移数接近3.83，高于商业Pt/C（3.62）。基于PpPD/XC72-Pt-MW的单电池显示出更高的比最大功率密度，为34.6 mW/cm² Pt，高于用商业Pt/C电极制备的单电池（30.6 mW/cm² Pt）。
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