化工进展 ›› 2023, Vol. 42 ›› Issue (2): 907-916.DOI: 10.16085/j.issn.1000-6613.2022-0762

• 材料科学与技术 • 上一篇    下一篇

颗粒状NiO的制备及其电化学性能和CO2吸附性能

杨泛明(), 贺国文   

  1. 湖南城市学院材料与化学工程学院,湖南 益阳 413000
  • 收稿日期:2022-04-26 修回日期:2022-05-26 出版日期:2023-02-25 发布日期:2023-03-13
  • 通讯作者: 杨泛明
  • 作者简介:杨泛明(1988—),男,博士,研究方向为新能源材料与新型吸附剂合成。E-mail:ychufei@163.com
  • 基金资助:
    湖南省自然科学基金(2019JJ50026)

Preparation of granular NiO for the electrochemical performance and CO2 adsorption performance

YANG Fanming(), HE Guowen   

  1. College of Materials and Chemical Engineering, Hunan City University, Yiyang 413000, Hunan, China
  • Received:2022-04-26 Revised:2022-05-26 Online:2023-02-25 Published:2023-03-13
  • Contact: YANG Fanming

摘要:

利用乙醇和去离子水的混合溶液为溶剂,通过静态水热处理合成NiO,并对其在KOH电解液中的电化学行为与CO2吸附性能进行探究。采用X射线衍射、X射线光电子能谱、扫描电子显微镜、能量色散谱和N2吸附-脱附技术对NiO的物相、形貌、组成和孔结构进行分析。结果表明,NiO为颗粒状介孔材料,属于立方系晶体。NiO中,Ni以Ni2+、Ni3+形式存在。以NiO为活性材料、6mol/L KOH为电解液组装三电极,可以产生赝电容。电流密度为1A/g,电压窗口为0.1~0.5V时,首次放电效率为93.5%,放电比容量为254.5F/g,能量密度为5.7Wh/kg,功率密度为200W/kg;循环1000次,放电比容量仅降低3.93%。NiO表面的CO2吸附过程符合Bangham模型;温度为25℃、气体流速为10mL/min时,CO2吸附量可达103.2mg/g;循环20次,吸附量保持稳定。

关键词: 氧化镍, 颗粒, 介孔, 赝电容, 吸附

Abstract:

NiO was synthesized by a static hydrothermal treatment in the mixed solvent of ethanol and deionized water. Besides, the electrochemical behavior of NiO in the KOH solution and CO2 adsorption performance were investigated. The phase, morphology, composition and pore structure of NiO were analyzed by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, energy dispersive spectroscopy and N2 adsorption-desorption techniques. The results showed that NiO was granular mesoporous material and belonged to cubic crystal. In NiO, Ni was in the form of Ni2+ and Ni3+. A pseudocapacitance behavior was detected in the three electrodes which was made up of the active substance of NiO and the electrolyte of KOH (6mol/L). When the current density was 1A/g and the voltage window was in the 0.1—0.5V range, an initial discharge efficiency of 93.5%, specific discharge capacity of 254.5F/g, the energy density of 5.7Wh/kg and the power density of 200W/kg were achieved. After 1000 cycles, the discharge specific capacity decreased only 3.93%. CO2 adsorption process on the surface of NiO was in accordance with the Bangham model. At 25℃, the adsorption capacity of 103.2mg/g could be achieved in the gas flow rate of 10mL/min. After 20 cycles, the capacity remained stable.

Key words: nickel oxide, granule, mesoporous, constraint capacitance, adsorption

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