Department of Chemistry, Missouri University of Science & Technology, Rolla, MO 65409, USA.
J Mater Chem B. 2019 Apr 14;7(14):2338-2348. doi: 10.1039/c9tb00104b. Epub 2019 Mar 8.
Uniform and porous CoNiSe was successfully synthesized by electrodeposition onto a composite electrode comprising reduced graphene oxide (rGO) anchored on a Ni foam substrate (prepared hydrothermally). This CoNiSe-rGO@NF composite electrode has been employed as an electrocatalyst for the direct oxidation of glucose, thereby acting as a high-performance non-enzymatic glucose sensor. Direct electrochemical measurement with the as-prepared electrode in 0.1 M NaOH revealed that the CoNiSe-rGO nanocomposite has excellent electrocatalytic activity towards glucose oxidation in an alkaline medium with a sensitivity of 18.89 mA mM cm and a wide linear response from 1 μM to 4.0 mM at a low applied potential of +0.35 V vs. Ag|AgCl. This study also highlights the effect of decreasing the anion electronegativity on enhancing the electrocatalytic efficiency by lowering the potential needed for glucose oxidation. The catalyst composite also exhibits high selectivity towards glucose oxidation in the presence of several interferents normally found in physiological blood samples. A low glucose detection limit of 0.65 μM and long-term stability along with a short response time of approximately 4 seconds highlights the promising performance of the CoNiSe-rGO@NF electrode for non-enzymatic glucose sensing with high precision and reliability.
通过在由还原氧化石墨烯（rGO）锚定在 Ni 泡沫基底（水热法制备）组成的复合电极上电沉积，成功合成了均匀且多孔的 CoNiSe。将 CoNiSe-rGO@NF 复合材料电极用作葡萄糖的直接氧化的电催化剂，从而作为高性能的非酶葡萄糖传感器。用所制备的电极在 0.1 M NaOH 中的直接电化学测量表明，CoNiSe-rGO 纳米复合材料在碱性介质中对葡萄糖氧化具有出色的电催化活性，在低施加电位为+0.35 V vs. Ag|AgCl 时，灵敏度为 18.89 mA mM cm，线性响应范围从 1 μM 到 4.0 mM。本研究还强调了通过降低葡萄糖氧化所需的电位来降低阴离子电负性对提高电催化效率的影响。该催化剂复合材料在存在生理血液样品中通常存在的几种干扰物的情况下，对葡萄糖氧化也表现出高选择性。低至 0.65 μM 的葡萄糖检测限、长期稳定性以及约 4 秒的短响应时间突出了 CoNiSe-rGO@NF 电极在高精度和可靠性方面用于非酶葡萄糖传感的有前景的性能。
