Mu Zhangyan, Yang Miao, He Wen, Pan Yanghang, Zhang Panke, Li Xuefei, Wu Xuejun, Ding Mengning
Key Laboratory of Mesoscopic Chemistry, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China.
State Key Laboratory of Analytical Chemistry for Life Sciences, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China.
J Phys Chem Lett. 2020 Jul 16;11(14):5798-5806. doi: 10.1021/acs.jpclett.0c01282. Epub 2020 Jul 7.
Metal nanocrystals have been extensively explored as efficient and tailorable electrocatalysts for various sustainable energy technologies. Precise understanding of molecular interactions at the electrode-electrolyte interfaces during electrochemical processes, which mostly relies on the interpretation of spectroscopic surface information, is crucial to the innovations in catalyst design and optimization of reaction conditions. Here, we demonstrate the first electrical transport evidence of pH-dependent surface anionic adsorptions on metal nanoparticles (MNPs), enabled by the on-chip electrical transport spectroscopy (ETS) of continuous nanoparticle (NP) thin films. Our results on platinum and gold NPs reveal the significant (and distinct) impacts of acid-base environments on their surface adsorption features, which contributes to the further understanding of gold- and platinum-based electrocatalytic systems. The successful employment of ETS on metal nanoparticles achieves a more general transport-based signaling technique that conveniently fits the abundance of catalytic materials with zero-dimension morphology.
金属纳米晶体作为用于各种可持续能源技术的高效且可定制的电催化剂已得到广泛研究。在电化学过程中，精确理解电极 - 电解质界面处的分子相互作用（这主要依赖于光谱表面信息的解释）对于催化剂设计的创新和反应条件的优化至关重要。在此，我们展示了通过连续纳米颗粒（NP）薄膜的片上电传输光谱（ETS）实现的金属纳米颗粒（MNP）上pH依赖的表面阴离子吸附的首个电传输证据。我们对铂和金纳米颗粒的研究结果揭示了酸碱环境对其表面吸附特性的显著（且独特）影响，这有助于进一步理解基于金和铂的电催化体系。在金属纳米颗粒上成功应用ETS实现了一种更通用的基于传输的信号技术，该技术方便地适用于大量零维形态的催化材料。
