A method for fabricating a carbon paste nanoelectrode (CPNE) is presented. The electrode is produced by carbonizing candle wax inside a quartz nanopipette, which can eliminate gaps between pyrolyzed carbon particles. This structure enables electrochemically deposited palladium nanoparticles (Pd NPs) to reside on the electrode surface rather than becoming embedded within the carbon matrix. Using this CPNE platform, measurements on a single Pd nanoparticle were conducted through potentiometric and voltammetric methods. The results demonstrate that the Nernst potential for Pd NP/PdCl 4 2‐ can be affected by the size of the Pd nanoparticles; however, no quantitative relationship between the Nernst potential and particle size was identified. This suggests that structural factors, such as crystal facets and lattice defects, also play important roles in influencing the Nernst potential. A voltammetric study of a Pd nanoparticle in sulfuric acid solution shows that no hydrogen adsorption is observed on a single Pd nanoparticle, which differs from the behavior observed on bulk Pd.
Oda et al. (Fri,) studied this question.