Patent ID: 11885762
Assignee: ZHEJIANG UNIVERSITY
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 1:
2. A preparation method of the iridium/iridium oxide electrode for quantitatively detecting the pH in the sulfide ion environment according to claim 1, comprising the following steps:
1) pouring polyether ether ketone (PEEK) particles into a concentrated sulfuric acid, and dissolving by stirring continuously; after the PEEK particles are completely dissolved, heating a resulting solution to 35° C. to 70° C., and conducting a vulcanization for 2 h to 4 h in an inert gas atmosphere;
2) slowly pouring a polymer solution obtained in step 1) into an ice-water mixture to terminate the vulcanization, collecting obtained formed particles, washing the obtained formed particles with water until a pH value of a washing solution reaches 6 to 7, and drying the obtained formed particles in an oven at 50° C. to 70° C. for 12 h to 48 h to obtain SPEEK particles;
3) pouring the SPEEK particles into a solvent, and dissolving by stirring to obtain a 10 wt % SPEEK solution;
4) mixing an inorganic acid, silicate, deionized water, and alcohol as raw materials at a molar ratio of (0.01-0.1):1:(2-8):(2-8), and stirring to form a homogeneous solution; pouring the 10 wt % SPEEK solution obtained in step 3) into the homogeneous solution and stirring uniformly, and adding the IL dropwise and stirring to obtain a SPEEK/SiOx/IL solution;
5) immersing the Ir/IrOxpH electrode into the IL, taking out and drying, to make a surface of the Ir/IrOx pH electrode covered with the IL layer; immersing an obtained IL layer-covered pH electrode into the SPEEK/SiOx/IL solution, taking out and air-drying upside down to form one layer of SPEEK/SiOx/IL composite film on a surface of the obtained IL layer-covered pH electrode;
6) repeating step 5) once on a single-layer SPEEK/SiOx/IL composite film-covered pH electrode obtained in step 5) to obtain the two layers of SPEEK/SiOx/IL composite film; immersing an obtained bilayer SPEEK/SiOx/IL composite film-covered pH electrode into the IL, taking out and drying, to make a surface of the outer layer of the two layers of SPEEK/SiOx/IL composite film covered with the IL layer; and
7) immersing a final pH electrode product obtained in step 6) into the 10 wt % SPEEK solution, taking out and air-drying upside down to obtain an Ir/IrOx pH electrode with the SPEEK/IL sandwich structure.