A novel dealloying strategy for fabricating nanoporous silver as an electrocatalyst for hydrogen peroxide detection.

A mild and low-cost strategy for fabricating nanoporous silver (NPS) thin films loaded on Ni wire were reported via co-electrodeposition of Ag-Sn alloy and subsequent dealloying in alkaline solution. Scanning electron microscope (SEM) and energy dispersive spectrum (EDS) were performed to investigate the morphology and composition of the electrodes. The crystal structures of the precursor alloy and NPS were examined by X-ray diffraction (XRD). After selectively etching the Sn out of the Ag-Sn alloy, an unordered three-dimensional bicontinuous nanoporous structure was observed, with a pore size of ∼50–120 nm and a ligament size of ∼40–200 nm. The NPS electrodes presented linear current response to hydrogen peroxide under the concentration ranging from 0.010 to 8.000 mM, with an excellent correlation coefficient (R 2 ) of 0.99998. The high sensitivity, reliability, anti-interference ability, stability and short response time indicate its potential in real-time monitoring H 2 O 2 . [ABSTRACT FROM AUTHOR]