Enhanced Nonenzymatic Glucose-Sensing Properties of Electrodeposited NiCo2O4-Pd Nanosheets: Experimental and DFT Investigations
Enhanced Nonenzymatic Glucose-Sensing Properties of Electrodeposited NiCo2O4-Pd Nanosheets: Experimental and DFT Investigations
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DOI：
10.1021/acsami.7b02217
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发表时间：
2017-07-19
影响因子：
9.5
通讯作者：
Rout, Chandra Sekhar
中科院分区：
文献类型：
--
作者：
Naik, Kusha Kumar;Gangan, Abhijeet;Rout, Chandra Sekhar
本文报道了电沉积法制备NiCo2O4 （NCO）和NiCo2O4- pd （NCO- pd）纳米片的方法。我们观察到与裸NCO纳米片相比，NCO- pd纳米片的葡萄糖传感性能增强。纯NCO纳米片的灵敏度为27.5 μ A μ M-1 cm(-2)，而NCO- pd纳米片的灵敏度为40.03 μ A μ M-1 cm（-2）。通过对NiCo2O4和pd掺杂NiCo2O4的部分态密度和电荷密度分布的论证，研究了葡萄糖在NiCo2O4和pd掺杂NiCo2O4上的相互作用和电荷转移机制，进行了密度泛函理论模拟，定性地支持了我们的实验观察结果。在费米能级附近存在已占据态和未占据态的密度，表明NiCo2O4中的Ni和Co离子都可以作为通信介质，通过参与氧化还原反应从葡萄糖中转移电荷。与裸NiCo2O4相比，葡萄糖的结合能更高，从葡萄糖到pd掺杂NiCo2O4的电荷转移更多，这表明pd掺杂NiCo2O4具有更好的电荷转移动力学，这支持了更高的葡萄糖传感性能。
Here, we report the facile synthesis of NiCo2O4 (NCO) and NiCo2O4-Pd (NCO-Pd) nanosheets by the electrodeposition method. We observed enhanced glucose-sensing performance of NCO-Pd nanosheets as compared to bare NCO nanosheets. The sensitivity of the pure NCO nanosheets is 27.5 mu A mu M-1 cm(-2), whereas NCO-Pd nanosheets exhibit sensitivity of 40.03 mu A mu M-1 cm(-2). Density functional theory simulations have been performed to qualitatively support our experimental observations by investigating the interactions and charge-transfer mechanism of glucose on NiCo2O4 and Pd-doped NiCo2O4 through demonstration of partial density of states and charge density distributions. The presence of occupied and unoccupied density of states near the Fermi level implies that both Ni and Co ions in NiCo2O4 can act as communicating media to transfer the charge from glucose by participating in the redox reactions. The higher binding energy of glucose and more charge transfer from glucose to Pd-doped NiCo2O4 compared with bare NiCo2O4 infer that Pd-doped NiCo2O4 possesses superior charge-transfer kinetics, which supports the higher glucose sensing performance.