Alternative Support Material to Platinum Catalyst Used for Oxygen Reduction Reaction: Nonporous Carbon

IF 1 Q3 MULTIDISCIPLINARY SCIENCES gazi university journal of science Pub Date : 2022-09-28 DOI:10.35378/gujs.1054803
Ayşenur Öztürk, Ayşe Bayrakçeken
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Abstract

In this study, unlike the porous carbon as a conventional catalyst support material in fuel cells, nonporous carbon was synthesized in the presence of different acid concentrations (0.2 M-1 M) and investigated as a support material for platinum (Pt) catalysts in the oxygen reduction reaction (ORR). Since the micropore volume of the synthesized carbons is negligible, the detected surface areas with Brunauer-Emmett-Teller (BET) method were in the range of 19-23 m2/g. Among the support materials, the carbon-supported Pt catalyst synthesized in the presence of 1 M acid was investigated electrochemically in terms of hydrogen oxidation (HOR) and ORR half-cell reactions in the three-electrode system. The Pt catalyst supported with nonporous carbon, synthesized using 1 M acid, reached the maximum limiting current value of -0.25 mA/cm2 (@2500 rpm) at ORR hydrodynamic curves. Low internal and charge transfer resistances of the same catalyst in electrochemical impedance spectroscopy (EIS) analysis are attributable to its nonporous structure.
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用于氧还原反应的铂催化剂的替代支撑材料:无孔碳
在本研究中,与多孔碳作为燃料电池中传统的催化剂载体材料不同,非多孔碳在不同酸浓度(0.2 M-1 M)下合成,并在氧还原反应(ORR)中作为铂(Pt)催化剂的载体材料进行了研究。由于合成的碳的微孔体积可以忽略不计,因此用brunauer - emmet - teller (BET)法检测到的比表面积在19-23 m2/g范围内。在载体材料中,对1 M酸存在下合成的碳负载Pt催化剂在三电极体系中进行了氢氧化(HOR)和ORR半电池反应的电化学研究。用1 M酸合成的无孔碳负载Pt催化剂在ORR流体动力学曲线上达到了-0.25 mA/cm2 (@2500 rpm)的最大极限电流值。在电化学阻抗谱(EIS)分析中,同一催化剂具有较低的内部电阻和电荷转移电阻,这是由于其无孔结构。
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来源期刊
gazi university journal of science
gazi university journal of science MULTIDISCIPLINARY SCIENCES-
CiteScore
1.60
自引率
11.10%
发文量
87
期刊介绍: The scope of the “Gazi University Journal of Science” comprises such as original research on all aspects of basic science, engineering and technology. Original research results, scientific reviews and short communication notes in various fields of science and technology are considered for publication. The publication language of the journal is English. Manuscripts previously published in another journal are not accepted. Manuscripts with a suitable balance of practice and theory are preferred. A review article is expected to give in-depth information and satisfying evaluation of a specific scientific or technologic subject, supported with an extensive list of sources. Short communication notes prepared by researchers who would like to share the first outcomes of their on-going, original research work are welcome.
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