碳纸负载钴氧化物的制备及电催化析氧性能研究

doi:10.11962/1006-4990.2019-0121

摘要/Abstract

摘要：

高效且廉价的电催化析氧反应（OER）电极材料的制备对其在电化学能源转化和储存系统中的应用具有重要的研究意义。通过溶剂热法和不同气氛焙烧,分别制得碳纤维纸（碳纸）负载的两种钴氧化物（一氧化钴和四氧化三钴）,并将其用作OER电极的催化剂。运用X射线衍射仪（XRD）、场发射扫描电镜（FESEM）和X射线光电子能谱（XPS）技术分别对两种材料的物相、形貌和表面价态进行了表征及分析。结果表明：在氮气气氛下焙烧得到一氧化钴纳米片,而在空气下焙烧得到四氧化三钴纳米片。通过线性扫描伏安法（LSV）、循环伏安曲线（CV）、电化学交流阻抗测试（EIS）和计时电位法对两种材料的电催化析氧性能进行了研究。结果表明：一氧化钴电极比四氧化三钴电极具有更优异的析氧反应催化活性和稳定性。在1 mol/L 氢氧化钾电解液中,一氧化钴和四氧化三钴电极在10 mA/cm ²电流密度下对应的电位分别为1.568 V和1.617 V。

关键词: 碳纤维纸, 四氧化三钴, 一氧化钴, 电催化

Abstract:

The design of electrocatalytic oxygen evolution reaction（OER） electrodes materials with high efficiency and low cost is of great significance to enhance the performance of electrochemical energy conversion and storage systems in large scale.Two kinds of cobalt oxides,such as CoO and Co₃O₄,on carbon fiber paper （CFP） were synthesized via solvothermal method and calcination in different atmosphere and applied them as OER electrodes.X-ray diffraction（XRD）,field emission scanning electron microscope（FESEM） and X-ray photoelectron spectroscopy（XPS） were used to characterize and analyze the phases,morphology and surface valence of the as-prepared cobalt oxides samples.Results showed that CoO nanosheet was obtained by calcination in nitrogen atmosphere,while Co₃O₄ nanosheet was obtained in air atmosphere.Linear sweep voltammetry（LSV）,cyclic voltammgrams（CV）,electrochemical impedance spectroscopy（EIS） and chronopotentiometric measurements were used to investigate the as-prepared cobalt oxides samples for OER performance.Results indicated that CoO electrode exhibited better OER activity and stability compared to that of Co₃O₄ electrode.In 1 mol/L KOH electrolyte,CoO and Co₃O₄ electrodes require 1.568 V and 1.617 V at a current density of 10 mA/cm ²,respectively.

Key words: carbon fiber paper, Co₃O₄, CoO, electrocatalytic

中图分类号:

TQ138.12

麦诗欣,程高,余林,孙明. 碳纸负载钴氧化物的制备及电催化析氧性能研究[J]. 无机盐工业, 2020, 52(1): 87-92.

Mai Shixin,Cheng Gao,Yu Lin,Sun Ming. Preparation of cobalt oxides on carbon fiber paper and its application in electrocatalytic oxygen evolution reaction[J]. Inorganic Chemicals Industry, 2020, 52(1): 87-92.

图/表 7

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催化剂	基底	电解液	10 mA/cm²下的过电势/mV	Tafel 斜率/ （mV·dec^-1）
CoO纳米片	碳纸	1.0 mol/L KOH	338	73.9
Co₃O₄纳米片	碳纸	1.0 mol/L KOH	387	85.0
CoO 纳米片^[9]	玻碳电极	1.0 mol/L KOH	320	70.0
CoO 纳米片/石墨烯^[10]	泡沫镍	0.1mol/L KOH	330	79.0
CoO/Mn₃O₄^[11]	玻碳电极	1.0 mol/L KOH	378	95.0
Co₃O₄纳米线^[12]	泡沫镍	1.0 mol/L KOH	339	82.0
Co₃O₄ 纳米棒^[13]	碳纸	1.0 mol/L KOH	370	105.0
还原氧化石墨烯- Co₃O₄ 纳米笼^[14]	玻碳电极	0.1mol/L KOH	410	84.9

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