Ullah Nabi, Guziejewski Dariusz, Mirceski Valentin
Department of Inorganic and Analytical Chemistry, University of Lodz, Pomorska 163, 90-236, Lodz, Poland.
Institute of Chemistry, Faculty of Natural Sciences and Mathematics, Ss Cyril and Methodius University in Skopje, P.O. Box 162, 1000, Skopje, North Macedonia.
Mikrochim Acta. 2025 Jul 11;192(8):496. doi: 10.1007/s00604-025-07325-4.
Nanoparticles composed specifically of transition metals have demonstrated significant potential not only in electrocatalysis but also in electroanalysis. In this context, this work presents a comprehensive investigation into the electrocatalytic properties of NiCoSe nanomaterials, specifically designed for hydrogen peroxide (HO) detection. The unique needle-like nano-moss morphology of NiCoSe, confirmed through scanning electron microscopy (SEM), scanning and transmission electron microscopy (STEM), and high-angle annular dark-field (HAADF) analysis, reveals a highly organized structure with a large surface area, critical for enhanced catalytic performance. XRD analysis further establishes the material's high crystallinity and purity. Electrochemical characterization using cyclic voltammetry (CV) demonstrated the electrocatalytic activity of NiCoSe towards the reduction of HO in both oxygenated and deoxygenated conditions. The study identified that HO disproportionation leads to oxygen generation at the electrode surface, which significantly enhances the reduction process. Tafel analysis showed notable enhancement of the electrode kinetics due to the catalyst's presence, affirming its efficacy in facilitating electron transfer. The influence of polyacrylic acid (PAA), used as a gas adsorbent, was also explored, confirming that while PAA slightly hinders diffusional mass transfer, it does not interfere with the overall catalytic process. Further investigation into the mechanistic aspects of the HO reduction suggested a complex reaction pathway, likely involving a CE mechanism combined with electrocatalysis of the second kind. This process is strongly influenced by the interplay between chemical disproportionation and electrode reactions, with oxygen acting as a redox catalyst. Finally, the practical application of NiCoSe-modified screen-printed electrodes (SPE) for gas-phase detection of HO was explored. The sensor demonstrated the capability to detect gaseous HO, providing valuable insights into its potential use for environmental monitoring and industrial safety applications.
专门由过渡金属组成的纳米颗粒不仅在电催化方面，而且在电分析中都显示出巨大的潜力。在此背景下，本工作对专门设计用于检测过氧化氢（HO）的NiCoSe纳米材料的电催化性能进行了全面研究。通过扫描电子显微镜（SEM）、扫描透射电子显微镜（STEM）和高角度环形暗场（HAADF）分析证实的NiCoSe独特的针状纳米苔藓形态，揭示了一种具有大表面积的高度有序结构，这对于增强催化性能至关重要。XRD分析进一步确定了该材料的高结晶度和纯度。使用循环伏安法（CV）进行的电化学表征表明，NiCoSe在含氧和脱氧条件下对HO的还原均具有电催化活性。研究发现，HO歧化导致电极表面产生氧气，这显著增强了还原过程。塔菲尔分析表明，由于催化剂的存在，电极动力学有显著增强，证实了其在促进电子转移方面的功效。还研究了用作气体吸附剂的聚丙烯酸（PAA）的影响，证实虽然PAA略微阻碍扩散传质，但它不会干扰整体催化过程。对HO还原机理方面的进一步研究表明存在复杂的反应途径，可能涉及CE机理与第二类电催化相结合。这个过程受到化学歧化和电极反应之间相互作用的强烈影响，氧气充当氧化还原催化剂。最后，探索了NiCoSe修饰的丝网印刷电极（SPE）在气相检测HO中的实际应用。该传感器展示了检测气态HO的能力，为其在环境监测和工业安全应用中的潜在用途提供了有价值的见解。
