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Ordered ultrathin film electrode as well as preparation method and application thereof

An ultra-thin film and electrode technology, applied in the field of electrochemistry, can solve the problems of low catalyst utilization efficiency, large mass transfer resistance, and unfavorable construction of a three-phase reaction interface, and achieve the effects of easy control and optimization of the structure and mild preparation conditions.

Active Publication Date: 2019-03-22
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the catalyst, proton conductor (Nafion resin) and pores (gas and water transport channels) in the thin catalyst layer are in a disordered state, it is not conducive to the construction of a three-phase reaction interface (proton channel, electron channel and gas channel), and the mass transfer resistance Larger, the utilization efficiency of the catalyst is still low

Method used

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  • Ordered ultrathin film electrode as well as preparation method and application thereof
  • Ordered ultrathin film electrode as well as preparation method and application thereof
  • Ordered ultrathin film electrode as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1: (deposition of Pd on both sides of Nafion film)

[0041] The Nafion membrane is placed between the two reaction pools, and the H 2 PdCl 4 (3.2mM), alcohol amine (25mM), polyoxyethylene lauryl ether (0.3mM) and ascorbic acid (5mM) mixed solution was added to the two reaction pool. After standing at 25° C. for 4 minutes, the reaction solution was poured out, and the membrane electrode was washed with deionized water.

[0042] A black Pd layer is deposited on both sides of the Nafion film. figure 1 It is the SEM and TEM photos of the catalyst layer of the prepared membrane electrode. The catalyst layer on the surface of the SEM photo is dendritic Pd. The Pd part on the Nafion membrane is peeled off by ultrasonic treatment, and the TEM characterization is performed. The TEM photo shows some Pd dendritic fragments, indicating that Each Pd branch is in turn composed of small dendritic structures. The results show that the catalyst layer is composed of a laye...

Embodiment 2

[0043] Example 2: (deposition of Pd@Pt core-shell structure catalyst layer on both sides of Nafion membrane)

[0044] Refer to Example 1 for the preparation process of the multi-level dendritic Pd layer loaded on both sides of the Nafion membrane.

[0045] The Pd@Pt core-shell structure catalyst layer was prepared by loading Pt on the hierarchical dendritic Pd by wet chemical method. Take H 2 PtCl 6 (0.6mM), a mixed solution of sodium dodecylsulfonate (27mM) and ascorbic acid (50mM) was added to the two reaction cells, reacted at 25°C for 7h, poured out the reaction solution, and washed the membrane electrode with deionized water. figure 2 It is an SEM photo of Pt loaded on the hierarchical dendritic Pd, and the results show that the hierarchical dendritic structure remains, and Pt is deposited on the surface of Pd to obtain a catalyst layer with a core-shell structure. The metal loading on both sides of the Nafion membrane is the same, and the ICP test results show that t...

Embodiment 3

[0049] Example 3 (changing the surfactant, preparing a layer of Pd@Pt core-shell catalyst layer on both sides of the Nafion membrane)

[0050] The Nafion membrane is placed between the two reaction pools, and the H 2 PdCl 4 (3.2mM), alcohol amine (25mM), polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer (0.06mM) and ascorbic acid (5mM) mixed solution into the two reaction pool. After standing at 25°C for 5 minutes, the reaction solution was poured out, and the membrane electrode was washed with deionized water. Figure 4 The SEM photo of the Pd layer of the membrane electrode prepared for this purpose shows that its structure is slightly different from the use of polyoxyethylene lauryl ether as a structure director, and it is the coexistence of nanoparticles and multi-level dendritic structures.

[0051] The Pd@Pt core-shell catalyst was prepared by loading Pt on the Pd layer by wet chemical method. Take H 2 PtCl 6 (0.6mM), the mixed solution of...

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Abstract

The invention provides an ordered ultrathin film electrode as well as a preparation method and application thereof. The preparation method comprises the following steps: putting an ion exchange film into a reactor; adding a mixed solution of a metal precursor, a coordinating agent and a reducing agent into the reactor; carrying out nucleation and growth at one side or two sides of the ion exchangefilm at the same time or step by step through ions, so as to prepare the ordered ultrathin film electrode. A catalyst layer of the ordered ultrathin film electrode is prepared from a branch-shaped metal material. The ordered ultrathin film electrode constructed by the invention has the advantages of low catalyst supporting amount, high utilization rate, rapid and simple preparation method and thelike. The prepared film electrode can be used for an electrolytic cell, a fuel cell, a sensor, a gas purification sensor or a membrane separation electrochemical reactor.

Description

technical field [0001] The invention belongs to the field of electrochemistry (membrane electrode preparation technology), and specifically relates to an ordered ultra-thin film electrode, a preparation method and an application thereof. The prepared membrane electrode can be used in electrolytic cells, fuel cells, sensors, gas purification separators or electrochemical reactors for membrane separation. Background technique [0002] Membrane electrodes (composed of ion exchange membranes and catalyst layers) are the core components of polymer membrane fuel cells and solid polymer electrolysis cells, and their structure and performance directly affect the performance of fuel cells or electrolysis cells. Optimizing the preparation method of membrane electrodes and then optimizing their structure and performance is one of the important ways to improve the performance of fuel cells or electrolytic cells. The development of traditional membrane electrodes has mainly gone through...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/92H01M4/94H01M4/88
CPCH01M4/8825H01M4/921H01M4/94Y02E60/50
Inventor 宋玉江刘会园秦嘉琪
Owner DALIAN UNIV OF TECH
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