Improvements in sensitivity and in anti-aging of Pt/C/Nafion® gases sensors modified by chromium

Yu Chuan Liu; Bing Joe Hwang; Iou Jeng Tzeng

doi:10.1016/S0022-0728(02)01058-6

Improvements in sensitivity and in anti-aging of Pt/C/Nafion® gases sensors modified by chromium

Yu Chuan Liu, Bing Joe Hwang, Iou Jeng Tzeng

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

Abstract

Pt/C/Nafion® composite electrodes prepared by a hot-pressed method were modified by chromium (Cr) for sensing hydrogen and oxygen in this study. The results indicate that the sensitivities of the Cr-modified electrodes in sensing hydrogen and oxygen rise markedly from 0.716 to 0.771 and from 0.414 to 0.533 μA per ppm, respectively, and the response and the recovery times on the Cr-modified electrode are shortened. Meanwhile, the Cr-modified Pt/C/Nafion® electrode can depress the aging in continuously sensing oxygen for 250 h. After aging, the sensitivities of the Pt/C/Nafion® electrode and the Cr-modified Pt/C/Nafion® electrode decrease by 81 and 65%, respectively. Generally, both the response and the recovery times decrease significantly with increasing gases concentrations. A sensing model was also proposed to illustrate the sensing phenomenon.

Original language	English
Pages (from-to)	85-90
Number of pages	6
Journal	Journal of Electroanalytical Chemistry
Volume	533
Issue number	1-2
DOIs	https://doi.org/10.1016/S0022-0728(02)01058-6
Publication status	Published - Sept 20 2002
Externally published	Yes

Keywords

Amperometric sensor
Chromium
Pt/C/Nafion®

ASJC Scopus subject areas

General Chemical Engineering
Analytical Chemistry
Electrochemistry

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10.1016/S0022-0728(02)01058-6

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title = "Improvements in sensitivity and in anti-aging of Pt/C/Nafion{\textregistered} gases sensors modified by chromium",

abstract = "Pt/C/Nafion{\textregistered} composite electrodes prepared by a hot-pressed method were modified by chromium (Cr) for sensing hydrogen and oxygen in this study. The results indicate that the sensitivities of the Cr-modified electrodes in sensing hydrogen and oxygen rise markedly from 0.716 to 0.771 and from 0.414 to 0.533 μA per ppm, respectively, and the response and the recovery times on the Cr-modified electrode are shortened. Meanwhile, the Cr-modified Pt/C/Nafion{\textregistered} electrode can depress the aging in continuously sensing oxygen for 250 h. After aging, the sensitivities of the Pt/C/Nafion{\textregistered} electrode and the Cr-modified Pt/C/Nafion{\textregistered} electrode decrease by 81 and 65%, respectively. Generally, both the response and the recovery times decrease significantly with increasing gases concentrations. A sensing model was also proposed to illustrate the sensing phenomenon.",

keywords = "Amperometric sensor, Chromium, Pt/C/Nafion{\textregistered}",

author = "Liu, {Yu Chuan} and Hwang, {Bing Joe} and Tzeng, {Iou Jeng}",

year = "2002",

month = sep,

day = "20",

doi = "10.1016/S0022-0728(02)01058-6",

language = "English",

volume = "533",

pages = "85--90",

journal = "Journal of Electroanalytical Chemistry",

issn = "0022-0728",

publisher = "Elsevier Sequoia",

number = "1-2",

}

TY - JOUR

T1 - Improvements in sensitivity and in anti-aging of Pt/C/Nafion® gases sensors modified by chromium

AU - Liu, Yu Chuan

AU - Hwang, Bing Joe

AU - Tzeng, Iou Jeng

PY - 2002/9/20

Y1 - 2002/9/20

N2 - Pt/C/Nafion® composite electrodes prepared by a hot-pressed method were modified by chromium (Cr) for sensing hydrogen and oxygen in this study. The results indicate that the sensitivities of the Cr-modified electrodes in sensing hydrogen and oxygen rise markedly from 0.716 to 0.771 and from 0.414 to 0.533 μA per ppm, respectively, and the response and the recovery times on the Cr-modified electrode are shortened. Meanwhile, the Cr-modified Pt/C/Nafion® electrode can depress the aging in continuously sensing oxygen for 250 h. After aging, the sensitivities of the Pt/C/Nafion® electrode and the Cr-modified Pt/C/Nafion® electrode decrease by 81 and 65%, respectively. Generally, both the response and the recovery times decrease significantly with increasing gases concentrations. A sensing model was also proposed to illustrate the sensing phenomenon.

AB - Pt/C/Nafion® composite electrodes prepared by a hot-pressed method were modified by chromium (Cr) for sensing hydrogen and oxygen in this study. The results indicate that the sensitivities of the Cr-modified electrodes in sensing hydrogen and oxygen rise markedly from 0.716 to 0.771 and from 0.414 to 0.533 μA per ppm, respectively, and the response and the recovery times on the Cr-modified electrode are shortened. Meanwhile, the Cr-modified Pt/C/Nafion® electrode can depress the aging in continuously sensing oxygen for 250 h. After aging, the sensitivities of the Pt/C/Nafion® electrode and the Cr-modified Pt/C/Nafion® electrode decrease by 81 and 65%, respectively. Generally, both the response and the recovery times decrease significantly with increasing gases concentrations. A sensing model was also proposed to illustrate the sensing phenomenon.

KW - Amperometric sensor

KW - Chromium

KW - Pt/C/Nafion®

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U2 - 10.1016/S0022-0728(02)01058-6

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JF - Journal of Electroanalytical Chemistry

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ER -

Improvements in sensitivity and in anti-aging of Pt/C/Nafion® gases sensors modified by chromium

Abstract

Keywords

ASJC Scopus subject areas

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