Tuning structures of Pt shells on Pd nanocubes as neutral glucose oxidation catalysts and sensors

• Published in: Applied surface science 2022-12, Vol.605, p.154670, Article 154670
• Main Authors: Wang, Shih-Sin, Qiu, Wei-Jia, Wang, Tzu-Pei, Lee, Chien-Liang
• Format: Article
• Language: English
• Subjects: Electrochemical quartz crystal microbalance; Glucose electrooxidation reaction; High-indexed facets; Non-enzymatic glucose sensor; Nonconvex surface effect
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2022.154670

[Display omitted] •Various Pt shell structures were synthesised on the surface of Pd NCs.•Pt surface facets impact significantly on the mechanism of neutral GOR.•GOR on the stellated Pd@Pt NCs with (211) facets occurs via a 12-electron patwahy.•Stellated Pd@Pt NCs are the best catalyst for sequential GOR.•Pd NCs with Pt corners having (210) and (950) facets enhance transient catalysis. Nanocrystals with high-indexed facets and low-coordinated atoms exhibit promising electrocatalytic activities. Herein, different Pt shell structures on the surface of Pd nanocubes (Pd@Pt NCs) were synthesised by varying the concentration of Pt precursors. The concave Pd@Pt NCs were used as electrocatalysts for neutral glucose oxidation reactions (GORs); the effect of Pt structure on the catalytic performance was studied. In sequential catalysis, stellated Pd@Pt NCs (Pd@Pt SNC) with (211) facets had an electron transfer number (Ne) of 12.69 and a specific activity of 4.69 × 10−9 mol·g·m−2, markedly higher than that of the other concave Pd@Pt NCs. In transient catalysis, Pd NCs with Pt-coated corners (Pd@Pt CNCC) containing (210) and (950) facets demonstrated a sensitivity of 11.06 μA·mM−1·cm−2 and a linear analysis range (2.4–10.6 mM). The high recoveries (98.80%–99.85%) and low relative standards (≤1.06%) in the serum sample corroborate the potential of Pd@Pt CNCC as an enzyme-free glucose sensor.