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Modification method of Pd membrane electrode based on formic acid electrooxidation

A modification method, membrane electrode technology, applied in battery electrodes, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc. , Pt poisoning and other problems, to achieve the effect of improving catalytic activity and anti-poisoning

Inactive Publication Date: 2014-09-03
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Direct electrooxidation is a dehydrogenation process, the product is CO 2 , while indirect electro-oxidation is a dehydration process, and the product is CO, which is a toxic intermediate species that can be adsorbed on the surface of Pt and easily occupy the active sites on the surface of Pt, which can easily poison Pt.
Therefore, in practical applications, Pt is not the best anode catalyst for direct formic acid fuel cells

Method used

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  • Modification method of Pd membrane electrode based on formic acid electrooxidation
  • Modification method of Pd membrane electrode based on formic acid electrooxidation
  • Modification method of Pd membrane electrode based on formic acid electrooxidation

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Embodiment 1

[0020] A method for modifying a Pd film electrode based on formic acid electrooxidation, using Sb to generate underpotential deposition on the Pd surface, depositing a single layer of Sb on the Pd substrate surface to improve the Pd surface structure, specifically adopting the following steps:

[0021] (1) Preparation of Pd film: the glassy carbon electrode was polished into a mirror surface on the suede, and then prepared in 0.1M HClO 4 Electrochemical cleaning (0~1.0V VS.SCE) is carried out in the process by cyclic voltammetry, and then palladium is deposited in the Pd plating solution (using cyclic voltammetry electrodeposition method, the plating solution is 5mM PdCl 2 +0.1M HClO 4 ).

[0022] (2) Deposit a single layer of Sb on the surface of the Pd film: deposit the Pd film with palladium in 0.1mM antimony potassium tartrate (APT)+0.5M H 2 SO 4 Centrally controlled potential deposition (0.2-0.3V vs. SCE) takes 10-30s to finish depositing a single layer of Sb on the su...

Embodiment 2

[0028] A method for modifying a Pd film electrode based on formic acid electrooxidation, using Sb to generate underpotential deposition on the Pd surface, depositing a single layer of Sb on the Pd substrate surface to improve the Pd surface structure, specifically adopting the following steps:

[0029] (1) Preparation of Pd film: the glassy carbon electrode was polished into a mirror surface on the suede, and then prepared in 0.1M HClO 4 In the process, cyclic voltammetry was used for electrochemical cleaning (0-1.0V VS.SCE), and a glassy carbon electrode was used as a working electrode, a platinum mesh was used as a counter electrode, and a saturated calomel electrode was used as a reference electrode to assemble it into a three-electrode system. , the electrolyte solution is 0.1M HClO 4 , the glassy carbon electrode is scanned by cyclic voltammetry, the scanning range: 0~1.0Vvs.SCE, the number of scanning segments: 50 segments, and the scanning speed: 0.1V / s. After cleaning,...

Embodiment 3

[0032] A method for modifying a Pd film electrode based on formic acid electrooxidation, using Sb to generate underpotential deposition on the Pd surface, depositing a single layer of Sb on the Pd substrate surface to improve the Pd surface structure, specifically adopting the following steps:

[0033] (1) Preparation of Pd film: the glassy carbon electrode was polished into a mirror surface on the suede, and then prepared in 0.1M HClO 4 In the process, cyclic voltammetry was used for electrochemical cleaning (0-1.0V VS.SCE), and a glassy carbon electrode was used as a working electrode, a platinum mesh was used as a counter electrode, and a saturated calomel electrode was used as a reference electrode to assemble it into a three-electrode system. , the electrolyte solution is 0.1M HClO 4 , using cyclic voltammetry to scan the glassy carbon electrode, the scanning range: 0 ~ 1.0V vs. SCE, the number of scanning segments: 50 segments, and the scanning speed: 0.1V / s. After clean...

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Abstract

The invention relates to a modification method of a Pd membrane electrode based on formic acid electrooxidation. The modification method comprises the steps of carrying out underpotential deposition on the surface of Pd by utilizing Sb, depositing a single layer of Sb on the surface of a Pd substrate so as to improve a Pd surface structure, polishing a glassy carbon electrode on a piece of chamois leather to form a mirror surface, then carrying out electrochemical cleaning in 0.1M of HClO4 by adopting a cyclic voltammetry, depositing the Pd in a Pd plating solution, then carrying out controlled potential electrodeposition (0.2-0.3Vvs.SEC) in 0.1mM of antimony potassium tartrate (APT)+0.5M of H2SO4 for 10-30s, and depositing the single layer of Sb on the surface of the Pd substrate. Compared with the prior art, with the adoption of the modification method, the single layer of Sb is deposited on the surface of the Pd substrate by virtue of a simple UPD (Under Potential Deposition) technology, and the Pd electrode modified by the Sb has the relatively good catalytic effect on formic acid.

Description

technical field [0001] The invention relates to a method for surface modification of Pd through the underpotential deposition (UPD) characteristic of Sb, in particular to a method for modifying a Pd film electrode based on formic acid electrooxidation. Background technique [0002] Direct formic acid fuel cell (DFAFC) has always been a research hotspot because of its excellent performance. Compared with direct methanol fuel cell (DMFC), DFAFC has a higher theoretical electromotive force. As a liquid fuel, formic acid is less toxic than methanol and is less permeable to proton exchange membranes. Not only that, formic acid is easy to store and can be obtained through biomass conversion. It is an ideal renewable fuel. The most important thing is that there is no C-C bond in the formic acid molecule, and the electrooxidation kinetics is fast, which can achieve efficient energy conversion. [0003] Pt has high catalytic activity for the oxidation of formic acid, but the electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/86H01M4/92C25D7/00B01J23/644
CPCY02E60/50C25D3/50C25D3/54C25D5/10H01M4/8853
Inventor 李巧霞王龙龙曹晓璐王亚骏
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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