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Preparation method of karst foam nickel for electrocatalytic full decomposition of water for hydrogen production and oxygen production

A nickel foam, full decomposition technology, applied in the electrolysis process, electrolysis components, electrodes and other directions, can solve the problems of poor hydrogen production and oxygen production activity, achieve excellent electrocatalytic activity and stability, improve mass transfer and charge transfer Efficiency, effect of simple preparation method

Active Publication Date: 2018-08-21
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, pristine nickel foam as a monolithic electrode has poor hydrogen and oxygen production activity under neutral conditions.

Method used

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  • Preparation method of karst foam nickel for electrocatalytic full decomposition of water for hydrogen production and oxygen production
  • Preparation method of karst foam nickel for electrocatalytic full decomposition of water for hydrogen production and oxygen production
  • Preparation method of karst foam nickel for electrocatalytic full decomposition of water for hydrogen production and oxygen production

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1. Pretreatment

[0029] 0.5cm×0.5cm nickel foam (thickness 1.7mm, surface density 380±20g m -2 , the number of pores is 110PPI) in 2mol / L HCl aqueous solution, water and ethanol in order to ultrasonically treat each for 30 minutes to remove oxides and pollutants on the surface of nickel foam, so that the nickel foam exposes a clean Ni metal surface.

[0030] 2. Etching of nickel foam

[0031] Under normal temperature conditions, the foamed nickel pretreated in step 1 was used as the working electrode, the graphite rod was used as the counter electrode, and the saturated Ag / AgCl was used as the reference electrode. 2 SO 4 Applying 0.1V (vs Ag / AgCl) constant voltage electrolysis in aqueous solution for 300s, foamed nickel is in electrochemical etching and H 2 SO 4 Under the combined action of etching, the surface is Ni and α-Ni(OH) 2 Heterojunction active ingredient, the interior is the nano tower peak of metallic Ni; Wash the foamed nickel with deionized water and ...

Embodiment 2

[0033] In this embodiment, at 0.5mol / L H 2 SO 4 Apply 0.1V (vs Ag / AgCl) constant voltage electrolysis 200s in the aqueous solution, other steps are identical with embodiment 1, obtain karst foamed nickel (see figure 2 ).

Embodiment 3

[0035] In this embodiment, at 0.25mol / L H 2 SO 4 Apply 0.1V (vs Ag / AgCl) constant voltage electrolysis 600s in the aqueous solution, other steps are identical with embodiment 1, obtain karst foamed nickel (see image 3 ).

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Abstract

The invention discloses a preparation method of karst foam nickel for electrocatalytic full decomposition of water for hydrogen production and oxygen production. The preparation method is characterized in that a foam nickel serves as a substrate, H2SO4 is used as an etching agent, and the foamed nickel is subjected to in-situ etching by adopting an electrochemical etching method to form the foamednickel with the typical karst landform. The prepared karst foamed nickel has the advantages of being large in specific surface area, high in conductivity, low in cost and the like which are achievedin the original foam nickel, and further has the advantages that the specific surface area is larger, moreover, the surface is Ni and alpha-Ni (OH)2 the heterojunction active component so that both hydrogen production and oxygen production can be achieved, the two functions can be flexibly switched, high reaction activity and stability are achieved, and a potential application prospect in the field of electrocatalytic decomposition of the water is achieved. According to the preparation method, the raw materials are cheap and easily available, and the preparation method is simple and economical, and is suitable for industrial large-scale production.

Description

technical field [0001] The invention belongs to the technical field of electrocatalytic water splitting, and in particular relates to a method for preparing nickel foam with karst topography (hereinafter referred to as karst nickel foam, karst NF). High catalytic activity and stability. Background technique [0002] The development and utilization of clean and renewable energy is an effective way to solve energy and environmental problems. Solar energy, wind energy, and tidal energy are typical renewable energy sources, but the use of them to generate electricity depends on the uncontrollable sun, wind, and tide, which brings problems such as intermittent discontinuity, and mismatch between power supply and peak demand. A feasible solution is to convert these renewable energies into storable hydrogen, and release the stored energy through hydrogen-oxygen fuel cells when used. Electrolysis of water is a simple and convenient way to use electricity to obtain hydrogen, but it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25F3/02C25B1/04C25B11/06C25B11/03
CPCC25B1/04C25F3/02C25B11/031C25B11/057Y02E60/36
Inventor 张伟高学庆曹睿
Owner SHAANXI NORMAL UNIV
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