The nanoporous PdCr alloy as a nonenzymatic electrochemical sensor for hydrogen peroxide and glucose
Dianyun Zhao1, Zhihong Wang, Jinping Wang
1Key Laboratory of Chemical Sensing & Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan, 250022, China. chm_xucx@ujn.edu.cn.
Abstract:
The nanoporous (NP) PdCr alloy is easily fabricated through one step mild dealloying a PdCrAl source alloy in NaOH solution. Electron microscopy demonstrates that dealloying a PdCrAl alloy generates a bicontinuous spongy morphology with a narrow ligament size of ∼5 nm. The as-made NP-PdCr alloy exhibits high sensing performance toward H2O2, such as a wide linear range from 0.1 to 1.9 mM, fast amperometric response, and a low detection limit of 3.1 μM. In particular, the NP-PdCr alloy has distinct sensing durability with almost no activity loss upon continuous H2O2 detection for two weeks. In addition, this nanostructure exhibits high activity for glucose sensing in a wide linear range from 1 to 38 mM, long-term stability, and it is also highly resistant toward poisoning by Cl-. Moreover, NP-PdCr shows good anti-interference toward ascorbic acid, uric acid, and dopamine after coating excess Nafion solution.
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