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Process for preparing carbon supported platinum-based surface alloy electrocatalytic electrode

A surface alloy, carbon-supported platinum-based technology, applied in electrodes, electrolysis processes, electrolysis components, etc., can solve the problems of high energy consumption, development limitations, and low electrode selectivity.

Inactive Publication Date: 2006-02-08
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional electrosynthesis is precisely due to the failure to rationally understand and solve the key problem of electrocatalysis, which has limited the development of this field to a certain extent.
Taking oxalic acid reduction and electrosynthesis of glyoxylic acid as an example, the cathode materials used so far in literature reports are generally materials with high hydrogen evolution overpotential (such as Pb, Ti, C, Hg, etc.), and the electrochemical reduction potential of oxalic acid is generally -1.2~ -1.4V (vs. SCE), the energy consumption is very high, and because the selectivity of the electrode is not high, it is easy to generate a variety of by-products

Method used

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  • Process for preparing carbon supported platinum-based surface alloy electrocatalytic electrode
  • Process for preparing carbon supported platinum-based surface alloy electrocatalytic electrode
  • Process for preparing carbon supported platinum-based surface alloy electrocatalytic electrode

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Preparation of platinum plating solution: Weigh potassium chloroplatinate and lead sulfate, dissolve them in deionized water and pass through sulfuric acid solution to prepare a solution containing 1.0mmol / L K 2 PtCl 6 +0.4mmol / L PbSO 4 +400mmol / L H 2 SO 4 aqueous solution, denoted as A # Plating solution. Preparation of lead and bismuth mixed plating solution: Weigh appropriate amount of bismuth oxide and lead sulfate, dissolve and mix with deionized water, and prepare 3.0mmol / LBi 3+ +1.0mmol / L Pb 2+ +200mmol / L HClO 4 Mixture, denoted as B # Plating solution.

[0023] The glassy carbon with clean surface was used as the cathode, the platinum-plated black electrode was used as the anode, and the saturated calomel electrode (SCE) was used as the reference electrode. Join A # Plating solution, using controlled current technology for constant current electrochemical deposition, the current density is 1 ~ 5mA / cm 2 , the deposition time was 5min; the sample after ...

Embodiment 2

[0028] Preparation of platinum plating solution: Weigh potassium chloroplatinate and lead sulfate, dissolve them in deionized water and pass through sulfuric acid solution to prepare a solution containing 2.0mmol / L K 2 PtCl 6 +0.3mmol / L PbSO 4 +500mmol / L H 2 SO 4 aqueous solution, denoted as A # Plating solution. Preparation of lead and bismuth mixed plating solution: Weigh appropriate amount of bismuth oxide and lead sulfate, dissolve and mix with deionized water, and prepare 2.0mmol / L Bi 3+ +1.8mmol / L Pb 2+ +300mmol / L HClO 4 Mixture, denoted as B # Plating solution.

[0029] The graphite with clean surface was used as the cathode, the platinum-plated black electrode was used as the anode, and the saturated calomel electrode (SCE) was used as the reference electrode. Join A # Plating solution, using controlled current technology for constant current electrochemical deposition, the current density is 1 ~ 5mA / cm 2 , the deposition time was 7min; the sample after elec...

Embodiment 3

[0034] Preparation of platinum plating solution: Weigh potassium chloroplatinate and lead sulfate, dissolve them in deionized water and pass through sulfuric acid solution to prepare a solution containing 3.0mmol / L K 2 PtCl 6 +0.2mmol / L PbSO 4 +300mmol / L H 2 SO 4 aqueous solution, denoted as A # Plating solution. Preparation of lead and bismuth mixed plating solution: Weigh appropriate amount of bismuth oxide and lead sulfate, dissolve and mix with deionized water, and prepare 1.5mmol / LBi 3+ +1.2mmol / L Pb 2+ +600mmol / L HClO 4 Mixture, denoted as B # Plating solution.

[0035] The glassy carbon with clean surface was used as the cathode, the platinum-plated black electrode was used as the anode, and the saturated calomel electrode (SCE) was used as the reference electrode. Join A # Plating solution, using controlled current technology for constant current electrochemical deposition, the current density is 1 ~ 5mA / cm 2 , the deposition time was 2min; the sample after ...

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Abstract

The invention relates to a carbon-supported Pt-based surface alloy electric catalytic electrode preparing method, preparing Pt plating solution and Pb-Bi mixed plating solution, using surface-cleaned carrier as cathode, platinum black plated platinum electrode as anode and saturated calomel electrode (SCE) as reference electrode, adding in Pt plating solution, selecting current control technique to make constant-current electrochemical deposition, washing the sample obtained, placing in HClO4 solution, adopting electrochemical circulating volt-ampere method for processing, then washing the sample processed, placing the Pb-Bi mixed plating solution, applying the electrochemical circulating volt-ampere method to control potential to deposit surface alloy, then transferring the sample with surface alloy to HClO4 solution, adopting electrochemical circulating volt-ampere method for processing, taking out the sample for washing and naturally airing. Compared with existing Pb electrode, it has the advantages of enhancing reaction selectivity and can make electrochemical reducing potential of oxalic acid shifted forward, extremely reducing overpotential of oxalic acid reduction and saving large amount of energy source.

Description

(1) Technical field [0001] The invention relates to a novel catalytic electrode suitable for an organic electrosynthesis system, in particular to a preparation method of a novel carbon-supported platinum-based surface alloy electrocatalytic electrode which can be used in a cathode reduction process and an anodic oxidation system. (2) Background technology [0002] Organic electrochemical synthesis (commonly known as electrosynthesis) is a rapidly developing new synthetic technology and an interdisciplinary subject of electrochemistry, organic synthetic chemistry and chemical reaction engineering. The organic electrosynthesis reaction can be carried out under normal temperature and normal pressure conditions. The system does not need toxic or dangerous oxidizing agents and reducing agents. "Electronics" are clean reactants. In the process of organic electrosynthesis, not only the purpose of synthesizing different organic products can be achieved by changing the electrode pote...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/08
Inventor 陈声培孙世刚黄桃
Owner XIAMEN UNIV