The nanoporous PdCr alloy as a nonenzymatic electrochemical sensor for hydrogen peroxide and glucose

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.