All solid-state pH electrode based on titanium nitride sensitive film

Titanium nitride was used as pH-sensitive material to fabricate all solid-state pH electrode. The fabrication and the response performance of the pH electrode were described in the paper. The TiN film electrode showed a linear response in the pH range of 2-12 with a near-Nenstian response (-55 mV/pH). The response time was within 1 min, and the electrode had good reproducibility, stability and low sensitivities for different species. Compared with the glass pH electrode, the electrode exhibited some advantages, for example, without activation, rapid response and high mechanical strength. In addition, the electrode performed excellently in a corrosion medium containing F-(1 M). Electrochemical behaviors of TiN electrode in Britton-Robinson buffers were studied with Electrochemical Impedance Spectroscopy (EIS).