The Good, the Bad and the Ugly of pH Microelectrodes

pH micro electrodes have been around for many years with several architectures already reported. We will review the existing options critically providing guidance on their fabrication, advantages and limitations. We will also report a new fabrication method to produce Pd hydride pH microelectrode using a chemical approach to synthesize the Pd hydride. In contrast to electrochemically generated PdH microelectrodes, this chemically generated Pd hydride microelectrodes are longer lasting, allowing long-time localized pH measurements.