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Palladium/gamma-manganese dioxide/foamed nickel composite electrode and preparation method and application thereof

A composite electrode, nickel foam technology, applied in electrodes, electrolysis components, electrolysis process, etc., can solve the problems of large load, high cost, low current efficiency, etc., and achieve the effect of low cost, long service life and reducing overpotential

Active Publication Date: 2022-05-27
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the electrode prepared by directly electrodepositing palladium on the substrate has a high dehalogenation efficiency, there are problems such as low current efficiency, large loading capacity, and high cost.

Method used

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  • Palladium/gamma-manganese dioxide/foamed nickel composite electrode and preparation method and application thereof
  • Palladium/gamma-manganese dioxide/foamed nickel composite electrode and preparation method and application thereof
  • Palladium/gamma-manganese dioxide/foamed nickel composite electrode and preparation method and application thereof

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preparation example Construction

[0039] The embodiment of the present invention also provides a Pd / γ-MnO 2 The preparation method of / Ni foam composite electrode includes the following steps:

[0040] (1) Pretreatment of nickel foam: The nickel foam was first ultrasonicated with acetone for 15-20 min to remove the surface organics; then ultrasonicated with 10% hydrochloric acid for 10-15 min to remove the oxide layer on the surface; finally, washed repeatedly with distilled water for 2-20 min. After 5 times, air dry to obtain pretreated nickel foam;

[0041] (2) γ-MnO 2 Preparation of the intermediate layer: the MnSO 4 and KMnO 4 Dissolve in water to prepare reaction solution A; then place the pretreated nickel foam in reaction solution A to carry out a hydrothermal reaction; after the reaction is finished, it is naturally cooled to room temperature, and the reacted nickel foam is taken out and sequentially used with ethanol and Deionized water was cleaned and dried to obtain γ-MnO 2 / Ni foam electrode; ...

Embodiment 1

[0053] This embodiment provides a Pd / γ-MnO 2 / Ni foam composite electrode, which is based on foamed nickel, firstly forms γ-MnO on the surface of foamed nickel through hydrothermal reaction 2 intermediate layer, which was then prepared by chemically depositing Pd nanoparticles; the resulting Pd / γ-MnO 2 / Ni foam composite electrode, γ-MnO 2 The loading of the intermediate layer is 0.33 mg / cm 2 , the deposition amount of Pd nanoparticles is 0.7 mg / cm 2 .

[0054] The Pd / γ-MnO 2 The preparation method of / Ni foam composite electrode includes the following steps:

[0055] (1) Pretreatment of nickel foam: The nickel foam (30 mm × 20 mm) was first sonicated with acetone for 15 min to remove organic matter on the surface; then sonicated with 10% hydrochloric acid for 15 min to remove the oxide layer on the surface; and finally repeated with distilled water. After cleaning 3 times, dry in the air to obtain pretreated nickel foam. The scanning electron microscope image of the pre...

Embodiment 2

[0062] In this embodiment, Pd / γ-MnO 2 The preparation process of / Ni foam composite electrode is the same as that in Example 1, the difference is: "In step (2), the MnSO 4 At a concentration of 0.5 mM” in water, the resulting Pd / γ-MnO 2 / Ni foam composite electrode, γ-MnO 2 The loading of the intermediate layer is 0.15 mg / cm 2 , the deposition amount of Pd nanoparticles is 0.7 mg / cm 2 .

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Abstract

The invention discloses a palladium / gamma-manganese dioxide / foamed nickel composite electrode and a preparation method and application thereof, and belongs to the technical field of electrochemical water treatment.The composite electrode is prepared in the mode that foamed nickel serves as a matrix, a gamma-crystal-form MnO2 middle layer is formed on the surface of the foamed nickel through a hydrothermal reaction, and then Pd nanoparticles are chemically deposited; wherein the loading capacity of the gamma-MnO2 intermediate layer on the foamed nickel is 0.30 mg / cm < 2 > to 0.35 mg / cm < 2 >; the deposition amount of the Pd nano particles is 0.68 mg / cm < 2 > to 0.72 mg / cm < 2 >. The invention also provides a preparation method of the composite electrode. The Pd / gamma-MnO2 / Ni foam composite electrode prepared by the invention is large in specific surface area, high in catalytic activity and good in cycling stability, can be used for quickly and efficiently electrocatalytically treating chlorophenol pollutants in wastewater, and has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of electrochemical water treatment, and in particular, the invention relates to a Pd / γ-MnO 2 / Nifoam composite electrode and preparation method and application thereof. Background technique [0002] Chlorinated aromatic compounds discharged from industrial and agricultural production activities are widespread pollutants in soil and groundwater. They are highly toxic and persistent, and are difficult to degrade in the natural environment. Electrocatalytic reduction dechlorination technology has the advantages of high reactivity, mild reaction conditions, convenient operation, and no secondary pollution, and can be used to degrade and remove chlorinated aromatic pollutants. [0003] The direct electrochemical dechlorination of inert materials requires high overpotential and high energy consumption. Therefore, it is of great economic value in electrode preparation to find materials that can catalyze the dehalo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/093C25B1/04C25B11/031C25B11/052C25B11/063
CPCC25B11/093C25B11/031C25B11/052C25B11/063C25B1/04Y02E60/50
Inventor 陈吕军徐冉云李菲菲田金平
Owner TSINGHUA UNIV
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