Enhanced Nonenzymatic Glucose-Sensing Properties of Electrodeposited NiCo₂O₄–Pd Nanosheets: Experimental and DFT Investigations

Abstract

Here, we report the facile synthesis of NiCoO (NCO) and NiCoO-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 μA μM cm, whereas NCO-Pd nanosheets exhibit sensitivity of 40.03 μA μM cm. Density functional theory simulations have been performed to qualitatively support our experimental observations by investigating the interactions and charge-transfer mechanism of glucose on NiCoO and Pd-doped NiCoO 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 NiCoO 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 NiCoO compared with bare NiCoO infer that Pd-doped NiCoO possesses superior charge-transfer kinetics, which supports the higher glucose-sensing performance.

NiCo2O4 Nano-/Microstructures as High-Performance Biosensors: A Review

“…The enhanced density of states near the Fermi level improved the conductivity of the NiCo 2 O 4 –Au nanosheet than NiCo 2 O 4 –Ag that caused superior glucose sensing performance. In a similar type of report, the sensitivities for pure NiCo 2 O 4 and NiCo 2 O 4 –Pd nanosheets electrodes in the linear range 5–90 μM and 70–450 μM were 27.5 and 40.03 μA μM −1 cm −2 and 8.53 and 8.23 μA μM −1 cm −2 , respectively [ 259 ].…”

Self-template formation of porous Co3O4hollow nanoprisms for non-enzymatic glucose sensing in human serum

“…When the glucose concentration exceeded 30 mM, the current response became gradually decreased, probably due to the adsorption and diffusion dominance of highly concentrated intermediates onto the active sites of Co 3 O 4 HNPs catalyst to impede incoming glucose. [39][40][41][42] In addition, the steady-state current response was achieved in about 0.1 s (Fig. S8 †), which is much faster than the previous glucose sensors based on metal oxide catalysts.…”

Polymorph nickel titanate nanofibers as bifunctional electrocatalysts towards hydrogen and oxygen evolution reactions

“…and NiO/TiO2 DFT study, where favours in electrochemical redox reaction as communicative media for charge transfer and water absorption. 14,37 If such semi-metallic/metallic states exists with the INTO, it has also been proven to increase the efficiency of catalyst for electrochemical water-splitting (NiTiO3/Ni), experimentally. 13 The optical conductivity of the INTO and SNTO were estimated from DFT analysis are shown in Figure 5 ranging 0 to 50 eV.…”