Sharma Raghunandan, Wang Yue, Li Fan, Chamier Jessica, Andersen Shuang Ma
Department of Chemical Engineering, Biotechnology and Environmental Technology, University of Southern Denmark, Campusvej 55, DK-5230 Odense M, Denmark.
Department of Chemistry and Chemical Engineering, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, P. R. China.
ACS Omega. 2019 Sep 10;4(13):15711-15720. doi: 10.1021/acsomega.9b02351. eCollection 2019 Sep 24.
A water-assisted control of Pt nanoparticle size during a surfactant-free, microwave-assisted polyol synthesis of the carbon-supported platinum nanoparticles (Pt/C) in a mixture of ethylene glycol and water using (NH)PtCl as the Pt precursor is demonstrated. The particle size was tuned between ∼2 and ∼6 nm by varying either the HO volume percent or the Pt precursor concentration during synthesis. The electrochemical surface area (ECSA) and the oxygen-reduction reaction activity obtained for the Pt/C electrocatalyst show a catalytic performance competitive to that of the state-of-the-art commercial Pt/C electrocatalysts used for polymer electrolyte membrane fuel cell electrodes (ECSA: ∼70 m/g; half-wave potential for oxygen reduction reaction: 0.83 V vs reversible hydrogen electrode). The synthesized Pt/C electrocatalysts show durability equivalent to or better than that of the commercial Pt/C. The durability was found to improve with increasing particle size, with the ECSA loss values being ∼70 and ∼55% for the particle sizes of 2.1 and 4.3 nm, respectively. The study may be used as a route to synthesize Pt/C electrocatalysts from a convenient and economic Pt precursor (NH)PtCl and avoiding the use of alkaline media.
在以乙二醇和水的混合物为溶剂、使用(NH)PtCl作为铂前驱体的无表面活性剂微波辅助多元醇法合成碳载铂纳米颗粒（Pt/C）过程中，展示了一种水辅助控制铂纳米颗粒尺寸的方法。通过在合成过程中改变水的体积百分比或铂前驱体浓度，可将颗粒尺寸调节在约2至约6纳米之间。所得Pt/C电催化剂的电化学表面积（ECSA）和氧还原反应活性显示出与用于聚合物电解质膜燃料电池电极的现有商用Pt/C电催化剂相竞争的催化性能（ECSA：约70 m/g；氧还原反应的半波电位：相对于可逆氢电极0.83 V）。合成的Pt/C电催化剂显示出与商用Pt/C相当或更好的耐久性。发现耐久性随颗粒尺寸增大而提高，对于尺寸为2.1和4.3纳米的颗粒，ECSA损失值分别约为70%和55%。该研究可作为一种从方便且经济的铂前驱体(NH)PtCl合成Pt/C电催化剂并避免使用碱性介质的途径。
