Kinetic studies of glucose electrocatalytic oxidation on GC/Ni electrode

Abstract

Nickel-modified glassy carbon electrode (GC/Ni) prepared by galvanostatic deposition was used for the electrocatalytic oxidation of glucose in alkaline solutions where different electrochemical methods were employed. In cyclic voltammetry studies, in the presence of glucose an increase in the peak current of the oxidation of nickel hydroxide is followed by a decrease in the corresponding cathodic current. This suggests that the oxidation of glucose is being catalyzed through mediated electron transfer across the nickel hydroxide layer comprising nickel ions of various valence states. Under the chronoamperometric regime, the reaction followed a Cottrellian behavior and the diffusion coefficient of glucose was found to be 8 × 10 −6 cm 2 s −1 . A mechanism based on the electrochemical generation of Ni 3+ -active sites and their subsequent consumptions by glucose has been discussed, and kinetic parameters have been derived. The heterogeneous rate constants for the oxidation of glucose at the surface of modified electrodes were determined by rotating disk electrode using the Koutecky-Levich plots, which are in agreement with the data obtained by chronoamperometry. C 2012 Wiley Periodicals, Inc. Int J Chem

Nanoporous nickel-copper-phosphorus amorphous alloy film for methanol electro-oxidation in alkaline medium

“…The squeezing capacitive loop of electrodes in high frequencies can be related to the combination of the R ct of transformation between NiOOH and Ni(OH) 2 on the surface. The Nyquist plots follow another small capacitive loop in low frequencies, especially these of electrodes in 0.1 M and 0.2 M of methanol solution, which is attributed to the absorbed intermediate products [54]. In addition, the diameters of the semi-circle become smaller with the increase of methanol concentration in high frequencies for both the NP-NiCuP-3 and S-NiCuP electrodes.…”

Three‐dimensional Porous Palladium Foam‐like Nanostructures as Electrocatalysts for Glucose Biofuel Cells

“…[16] R ct of the glucose oxidationr eaction (GOR)o nt he bare ITO was calculatedt ob ea pproximately 165 W (Table S1, Supporting Information). When the conventional porous Pd nanostructures (sample S5) were deposited, R ct decreased markedly (78 W).…”

Electrocatalytic Oxidation of Glucose on Highly Dispersed Ni-B/Nanoporous Cu Amorphous Alloy Electrode

“…NaOH 溶液呈现的响应电流扣除空白溶液响应电流后的电流 I 与 t 的吸附引起的 [20] . 由表 2 可知, 相比于块状镍电极, 高 分散 Ni-B/NPC 电极具有较低的电荷传递电阻和双电层 电容, 说明 Ni-B/NPC 电极具有更快的电子传递速率, 有利于葡萄糖氧化反应法拉第过程的发生 [37] , 从而降 低葡萄糖氧化起始电位.…”

“…近年来, 关于镍及其化合物电极用于葡萄 糖电催化氧化成为人们研究的重点领域. 如 Yousef Elahi 等 [12] 用姜黄素改性镍玻碳电极; Qiu 等 [13] 制备出树 枝状铜镍合金电极; Jafarian 等 [14] 在玻碳电极上恒电流 沉积镍和铜镍合金电极; Zheng 等 [15] 制备了镍离子和槲 皮素复合改性碳纳米管离子液体糊状电极; Ganesh 等 [16] 在 ITO 电极上沉积氢氧化镍; Chekin 等 [17] 合成了镍/聚 丙烯腈和碳纳米管复合改性电极; Chen 等 [18] 在泡沫镍 上沉积银纳米粒子制备了泡沫银/镍电极; Galindo 等 [19] 用电化学方法合成铁酸镍电极; Danaee 等 [20] 通过恒电流 法沉积镍修饰玻碳电极; El-Refaei 等 [21] 采用锰镍的复 合氧化物改性玻碳电极. 尽管这些镍基催化剂对葡萄糖 的电催化氧化呈现一定的活性和抗毒化能力, 但低表面 积的载体限制其电催化活性.…”