Zang Lei, Yan Jie, Pang Mingyuan, Zhang Ben, Chen Jianyu, Guo Peizhi
Institute of Materials for Energy and Environment, College of Materials Science and Engineering, Qingdao University, Qingdao 266071, P. R. China.
Langmuir. 2021 Nov 9;37(44):13132-13140. doi: 10.1021/acs.langmuir.1c02324. Epub 2021 Oct 29.
Although many researchers have made great efforts to pursue promising high-efficiency electrocatalysts, a formidable challenge remains for designing excellent palladium-based electrocatalysts for commercializing direct liquid fuel cells. This study reports the synthesis of bimetallic PdPb nanoparticles (NPs) via a mixed solution containing cetyl trimethyl ammonium bromide as the capping agent. Alloyed PdPb NPs are formed, where the size of the NPs increases as Pb atoms are introduced gradually. However, PdPb NPs are obtained with the same molar ratio of Pd and Pb in the raw systems. Among all of the as-made NPs, PdPb NPs exhibit superior catalytic activity (2620 mA mg) toward ethanol electrooxidation, 4.3 times higher than commercial Pd/C catalysts (613 mA mg). The overall rate of the EOR for PdPb NPs is determined, demonstrating that the electrocatalytic activity of the PdPb NPs increases at high catalytic temperatures, in high pH environments, and/or at high ethanol concentrations.
尽管许多研究人员为寻求有前景的高效电催化剂付出了巨大努力，但设计出用于直接液体燃料电池商业化的优异钯基电催化剂仍然面临巨大挑战。本研究报告了通过以十六烷基三甲基溴化铵为封端剂的混合溶液合成双金属钯铅纳米颗粒（NPs）。形成了合金化的钯铅纳米颗粒，随着铅原子的逐渐引入，纳米颗粒的尺寸增大。然而，在原始体系中钯和铅以相同的摩尔比获得钯铅纳米颗粒。在所有制备的纳米颗粒中，钯铅纳米颗粒对乙醇电氧化表现出优异的催化活性（2620 mA mg），比商业钯/碳催化剂（613 mA mg）高4.3倍。确定了钯铅纳米颗粒乙醇氧化反应（EOR）的总速率，表明钯铅纳米颗粒的电催化活性在高催化温度、高pH环境和/或高乙醇浓度下会增加。
