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A method to improve mno in electrodes x Method for Catalyst Oxygen Reduction Activity

A catalyst and electrode technology, which is applied in the field of improving the oxygen reduction activity of MnOx catalysts, can solve the problems of ORR activity changes and changes, and achieve the effects of improving oxygen reduction activity, reducing impact, and strong controllability

Active Publication Date: 2016-09-14
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, in the electrochemical environment, as the potential changes, the valence state of Mn on the surface of the catalyst will also change, resulting in a change in the composition of MnOx on the surface, resulting in a change in the ORR activity.

Method used

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  • A method to improve mno in electrodes <sub>x</sub> Method for Catalyst Oxygen Reduction Activity
  • A method to improve mno in electrodes <sub>x</sub> Method for Catalyst Oxygen Reduction Activity

Examples

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Effect test

Embodiment 1

[0027] Weigh 30mg of prepared MnO x As a catalyst, 2 mL of ethanol and 67 mg of Nafion emulsion with a mass fraction of 5% were sequentially added, and the slurry uniformly dispersed by ultrasonic was coated on the surface of a Pt electrode to obtain a working electrode. Take the Pt sheet as the counter electrode and the Hg / HgO electrode as the reference electrode, between 0-0.3V with 10mVs -1 Cyclic voltammetry scan (20 circles) at the scanning speed, the electrode rotation speed is 1600rpn, the half-wave potential of the ORR polarization curve shifts about 30mV, MnO x The catalytic activity for ORR was significantly improved, such as figure 2 shown.

Embodiment 2

[0029] Weigh 30mg of prepared MnO x As a catalyst, 2 mL of ethanol and 67 mg of Nafion emulsion with a mass fraction of 5% were sequentially added, and the slurry uniformly dispersed by ultrasonic was coated on the surface of a Pt electrode to obtain a working electrode. With the Pt sheet as the counter electrode and the Hg / HgO electrode as the reference electrode, the ORR catalytic activity was significantly improved after maintaining the potential at 0.2 V for 5 min.

Embodiment 3

[0031] Weigh 30mg of prepared MnO x As a catalyst, 2 mL of ethanol and 67 mg of Nafion emulsion with a mass fraction of 5% were sequentially added, and the slurry uniformly dispersed by ultrasonic was coated on the surface of a Pt electrode to obtain a working electrode. With Pt sheet as the counter electrode, Hg / HgO electrode as the reference electrode, with 1mVs -1 The scan rate is linearly scanned within the potential window of 0.0-0.4V, and its ORR catalytic activity is significantly improved.

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Abstract

In the prior art, MnOx catalysts have good oxygen reduction activity under alkaline conditions, and have advantages of low cost, simple preparation and the like, but Mn in the usually-prepared MnOx is mixed valence, and the low valence Mn has poor oxygen reduction reaction activity. The present invention relates to a method for increasing oxygen reduction activity of a MnOx catalyst, wherein the method specifically comprises: under an alkaline condition, carrying out an electrochemistry treatment on a MnOx catalyst through cyclic voltammetry scanning or linear scanning or constant potential to increase the high valence Mn (IV) content in the MnOx catalyst so as to increase the oxygen reduction activity of the catalyst. The method has advantages of simpleness, easy performing, stability, reliability and the like.

Description

technical field [0001] The invention relates to the field of fuel cell catalysts, in particular to a method for improving the oxygen reduction activity of MnOx catalysts under alkaline conditions. Background technique [0002] With the increasing consumption of fuels such as coal, oil and natural gas and the depletion of energy resources, it is urgent to find energy technologies that are environmentally friendly and sustainable. Because of its high energy conversion efficiency, no pollution, no noise and other advantages, fuel cells have become a research hotspot all over the world. [0003] Fuel cell technologies include proton exchange membrane fuel cells, solid oxide fuel cells, metal air fuel cells, and alkaline anion exchange membrane fuel cells. As far as the current technology is concerned, proton exchange membrane fuel cells are expensive and limited by precious metal catalyst resources; solid oxide fuel cells need to be operated under high temperature conditions; m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/34B01J37/34
Inventor 孙公权姜鲁华唐琪雯
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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