Material containing passivation layer structure and preparation method and application thereof

Abstract

The invention belongs to the technical field of electrode materials, and particularly relates to a material containing a passivation layer structure and a preparation method and application thereof. The material comprises metal phosphide / metal sulfide / metal silicate located inside, a surface passivation layer coating the surface of the material, and an intermediate passivation layer between the metal phosphide / metal sulfide / metal silicate and a metal oxide, the surface passivation layer is a first metal oxide layer or a composite passivation layer; the middle passivation layer is selected from one or more of a second metal oxide layer and a non-metal anion salt layer; the metal phosphide / metal sulfide / metal silicate is metal phosphide, metal sulfide or metal silicate. The invention provides an application of a multilayer composite metal oxide and non-metal anion salt passivation layer structure in oxidation prevention and corrosion resistance of an electrolytic water / seawater anode side and coupling fluctuation renewable energy hydrogen evolution of a cathode side for the first time.

Claims

1. A material containing a passivation layer structure, characterized in that: The material comprises: a metal phosphide / metal sulfide / metal silicate located inside, a surface passivation layer coated on the surface of the material, and an intermediate passivation layer between the metal phosphide / metal sulfide / metal silicate and the metal oxide; The surface passivation layer is a first metal oxide layer or a composite passivation layer; The intermediate passivation layer is selected from: one or more layers of a second metal oxide layer and a non-metal anion salt layer; The composite passivation layer is: a mixed layer containing a first metal oxide and a second metal oxide, a mixed layer containing a first metal oxide and a non-metallic anion salt, or a mixed layer containing a first metal oxide, a non-metallic anion salt and a second metal oxide; The metal phosphide / metal sulfide / metal silicate is a metal phosphide, a metal sulfide or a metal silicate.

2. The material containing a passivation layer structure according to claim 1, characterized in that: The metal in the metal phosphide / metal sulfide / metal silicate is selected from one or more of nickel, cobalt, iron, vanadium, chromium and manganese; The first metal oxide is selected from one or more of chromium oxide, manganese oxide, zirconium oxide, cerium oxide, niobium oxide, tantalum oxide, and vanadium oxide; the metal valence state of the first metal oxide is trivalent or higher.

3. The material containing a passivation layer structure according to claim 1, characterized in that: The first metal oxide is selected from: one or more of chromium trioxide, manganese dioxide, zirconium dioxide, cerium dioxide, niobium pentoxide, tantalum pentoxide, and vanadium pentoxide.

4. The material containing a passivation layer structure according to claim 1, characterized in that: The non-metallic anion salt layer is selected from one or more of sulfate, phosphate and silicate layers; The second metal oxide layer is selected from one or more of a vanadium oxide layer, a nickel oxide layer, a cobalt oxide layer, a chromium oxide layer, a manganese oxide layer, and an iron oxide layer.

5. The material containing a passivation layer structure according to claim 1, characterized in that: The metal in the second metal oxide layer is selected from: the metal in the metal phosphide / metal sulfide / metal silicate; When the material comprises the metal phosphide, the non-metallic anion salt layer comprises a phosphate layer; When the material comprises the metal sulfide, the non-metallic anion salt layer comprises a sulfate layer; When the material comprises the metal silicate, the non-metal anion salt layer comprises a silicate layer.

6. The material containing a passivation layer structure according to claim 1, characterized in that: The total thickness of the surface passivation layer and the intermediate passivation layer is 5 to 40 nanometers.

7. A method for preparing a material containing a passivation layer structure, characterized in that: The preparation method comprises the following steps: Step A, providing a heterojunction material; The heterojunction material comprises: metal phosphide / metal sulfide / metal silicate and metal oxide nanoarray; a heterojunction is formed between the metal phosphide / metal sulfide / metal silicate and the metal oxide; The metal phosphide / metal sulfide / metal silicate is a metal phosphide, a metal sulfide or a metal silicate; Step B: using the heterojunction material as the cathode for electrolyzing water / seawater and performing electrolysis under frequent start-stop conditions, or using the heterojunction material as the anode for electrolyzing water / seawater and performing electrolysis under an oxidizing potential, thereby obtaining the material according to claim 1.

8. Use of the material containing a passivation layer structure according to claim 1 in electrolysis of water / seawater for oxygen evolution.

9. Use of the material containing a passivation layer structure according to claim 1 in hydrogen evolution by electrolysis of water / seawater coupled with fluctuating energy.

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