Inkjet printed Ta2O5 on a flexible substrate for capacitive pH sensing at high ionic strength

Preparation and application of a Cu-doped antimony electrode to improve the performance of pH measurement in seawater

“…The Tafel curve and electrochemical impedance spectra (EIS) were obtained using a three-electrode system, in which the silver/silver chloride electrode and platinum sheet were used as the reference and counter electrodes, respectively, while the prepared electrode was used as the working electrode. Britton-Robinson (B-R) buffer solutions were prepared to obtain different pH (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12) solutions for establishing the response curves of the electrodes. The standard buffer solutions of pH 4.01, 6.86 and 9.18 were used to measure the Tafel curve, EIS and temperature coefficient.…”

“…Metal/metal oxide pH electrodes have the advantages of robustness and stability at high temperatures and pressures, making them suitable for applications in complex environments. RuO 2 , [3][4][5] Ta 2 O 5 , 6 TiO 2 , [7][8][9][10][11] Sb/Sb 2 O 3 , [12][13][14][15][16] PdO, 17 IrO 2 , 18-20 WO 3 , 21 and others have been reported to exhibit pH response. However, the aforementioned electrodes suffer either from a slow response time and poor stability, or high manufacturing cost, thereby restricting their widespread use.…”

Highly Sensitive and Selective Sol-Gel Spin-Coated Composite TiO2–PANI Thin Films for EGFET-pH Sensor

“…Numerous studies have been carried out to develop EGFET-pH sensors based on different sensing electrodes. pH sensors based on metal oxides such as titanium dioxide (TiO 2 ) [ 3 , 4 ], tin oxide (SnO 2 ) [ 5 ], zinc oxide (ZnO) [ 6 , 7 ], ruthenium oxide (RuO 2 ) [ 8 ], nickel oxide (NiO) [ 9 ], copper oxide (CuO) [ 10 ], tantalum oxide (Ta 2 O 5 ) [ 11 ], and others have been studied owing to their high sensitivity to hydrogen ions and a high degree of accuracy. Among these, TiO 2 is a promising material owing to its superior chemical stability, nontoxicity, relatively inexpensive costs, and easy fabrication [ 3 , 4 ].…”