Electrodeposited Pd/Ni/Si micro-channel plate electrode for hydrogen peroxide detection and application

A novel method to construct a sensitive amperometric sensor for hydrogen peroxide (H <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> O <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> ) is described. It is composed of highly dispersed palladium nanoparticles on a vertically aligned nickel-coated silicon micro-channel plate (MCP). The morphology of the Pd/Ni/Si-MCP electrode is characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The electrode with a three-dimensional structure shows high-catalytic activity towards oxidation of H <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> O <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> in a 0.10 M KOH solution. The electrode boasts a high sensitivity of 0.86 mAmM <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-1</sup> cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-2</sup> at an applied potential of 0.12V, and the detection limit is 7.6μM. The linear range is up to 12.5mA with a linear correlation of 0.99923. In addition, the electrode also exhibits superior stability, anti-interference, and selectivity. These features demonstrate the Pd/Ni/Si-MCP electrode is suitable for detection of H <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> O <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> .