Oxygen evolution electro-catalytic material based on transition metal salt and preparation method and application thereof
A transition metal salt, electrocatalytic material technology, applied in electrodes, electrolysis process, electrolysis components, etc., can solve problems such as affecting electrolysis efficiency and service life, unable to meet the requirements of practical applications, excessive oxygen evolution overpotential, etc. The effect of excellent oxygen evolution electrocatalytic performance and excellent electrocatalytic stability
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[0034] In some typical embodiments, the preparation method includes: reacting a homogeneous liquid-phase mixed reaction system containing hydrogen fluoride, hydroxide, cobalt salt, and nickel salt at -2 to 99°C under nitrogen protection for 0.5 to 2 hours to obtain Oxygen evolution electrocatalytic materials of transition metal salts, whose chemical formula is expressed as MCo (1-x) Fe x f 3 , M represents the charge balance ion, 0<x<1.
[0035] Further, M includes potassium ions, sodium ions, etc., but is not limited thereto.
[0036] In some typical embodiments, the preparation method further includes: passing nitrogen and deoxygenating the homogeneous liquid-phase mixed reaction system for more than 20 minutes.
[0037] In some typical embodiments, the preparation method specifically includes:
[0038] Add electrolyte to the mixed solution of hydrogen fluoride and hydroxide, pass nitrogen to remove oxygen for more than 20 minutes, and control the temperature of the mixe...
Embodiment 1
[0069] KCo 0.75 Ni 0.25 f 3 Preparation: Take 50mL of 3mol / L hydrofluoric acid, add 55mL of 3mol / L KOH, pass nitrogen to remove oxygen for 20 minutes; then take 0.0375mol of cobalt sulfate and 0.0125mol of nickel sulfate, mix and grind them and directly add them to the above solution In the process, the temperature was maintained at 95° C. under the condition of ultrasonic vibration, and the product was obtained by reacting for 1 h. Stand to separate layers, separate the solid, wash and dry to obtain the oxygen evolution electrocatalyst KCo 0.75 Fe 0.25 f 3 , its XRD diffraction pattern is shown in figure 1 Shown in curve c.
Embodiment 2
[0071] KCo 0.5 Ni 0.5 f 3 Preparation: take 50mL of 3mol / L KF, pass nitrogen to remove oxygen for 25 minutes; in order to prevent the hydrolysis of metal ions, the temperature of the solution is controlled at -2°C. In order to reach -2°C, add solid NaCl according to the principle of colligative property to make it saturated; then take 0.025 mol of cobalt chloride and 0.025 mol of nickel sulfate, add them directly to the above solution after grinding, and ultrasonically oscillate for 0.0-10.0h; then Raise the temperature to 99°C and continue the reaction for 0.5h to obtain the product. Stand to separate layers, separate the solid, wash and dry to obtain the oxygen evolution electrocatalyst KCo 0.5 Ni 0.5 f 3 , its XRD diffraction pattern is the same as figure 1 The middle curve c is similar.
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