Evaluating the effect of surface modifications on Ni based electrodes for alkaline water electrolysis

K. Zeng, Dongke Zhang

    Research output: Contribution to journalArticle

    40 Citations (Scopus)

    Abstract

    In an effort to improve the efficiency of alkaline water electrolysis for hydrogen production, surface modifications to Ni based electrodes were made by means of mechanical polishing using sandpapers of different sand grain sizes and chemical coating using electrochemical deposition of Ni and Co. The hydrogen evolution reaction was studied to reveal and compare the apparent and intrinsic activities of the electrodes, as indicated by the Tafel curves based on the geometric surface area and effective surface area, respectively. A relative roughness factor, which was estimated from the double layer capacitance in the impedance measurement, was introduced to characterise the effective surface area. The relative roughness factor of the six modified electrodes varied from 3.3 to 5.6. The electrode polished with the P400 sandpaper achieved the best apparent activity by possessing the lowest overpotential of 422 mV at the current density of 750 A m-2. For electrodes modified by the mechanical polishing, the Tafel curves collapsed into a narrow band when the current density was divided by the relative roughness factor, which validated the method of using the relative roughness factor for quantifying the effective surface area. The intrinsic activity of the hydrogen evolution reaction on Ni electrode can be expressed as η = 0.02 + 0.191·Log(j″), where j″ is the current density based on the effective surface area. For the electrodes modified by electrochemical depositions of Ni and Co, a variation in the intrinsic activity was observed for the different electrodes. This was attributed to their surface composition differences. © 2013 Elsevier Ltd. All rights reserved.
    Original languageEnglish
    Pages (from-to)692-698
    Number of pages7
    JournalFuel
    Volume116
    Early online date6 Sep 2013
    DOIs
    Publication statusPublished - 15 Jan 2014

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    Electrolysis
    Surface treatment
    Electrodes
    Water
    Surface roughness
    Current density
    Polishing
    Hydrogen
    Hydrogen production
    Surface structure
    Capacitance
    Sand
    Coatings

    Cite this

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    title = "Evaluating the effect of surface modifications on Ni based electrodes for alkaline water electrolysis",
    abstract = "In an effort to improve the efficiency of alkaline water electrolysis for hydrogen production, surface modifications to Ni based electrodes were made by means of mechanical polishing using sandpapers of different sand grain sizes and chemical coating using electrochemical deposition of Ni and Co. The hydrogen evolution reaction was studied to reveal and compare the apparent and intrinsic activities of the electrodes, as indicated by the Tafel curves based on the geometric surface area and effective surface area, respectively. A relative roughness factor, which was estimated from the double layer capacitance in the impedance measurement, was introduced to characterise the effective surface area. The relative roughness factor of the six modified electrodes varied from 3.3 to 5.6. The electrode polished with the P400 sandpaper achieved the best apparent activity by possessing the lowest overpotential of 422 mV at the current density of 750 A m-2. For electrodes modified by the mechanical polishing, the Tafel curves collapsed into a narrow band when the current density was divided by the relative roughness factor, which validated the method of using the relative roughness factor for quantifying the effective surface area. The intrinsic activity of the hydrogen evolution reaction on Ni electrode can be expressed as η = 0.02 + 0.191·Log(j″), where j″ is the current density based on the effective surface area. For the electrodes modified by electrochemical depositions of Ni and Co, a variation in the intrinsic activity was observed for the different electrodes. This was attributed to their surface composition differences. {\circledC} 2013 Elsevier Ltd. All rights reserved.",
    author = "K. Zeng and Dongke Zhang",
    year = "2014",
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    doi = "10.1016/j.fuel.2013.08.070",
    language = "English",
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    Evaluating the effect of surface modifications on Ni based electrodes for alkaline water electrolysis. / Zeng, K.; Zhang, Dongke.

    In: Fuel, Vol. 116, 15.01.2014, p. 692-698.

    Research output: Contribution to journalArticle

    TY - JOUR

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    AU - Zhang, Dongke

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    AB - In an effort to improve the efficiency of alkaline water electrolysis for hydrogen production, surface modifications to Ni based electrodes were made by means of mechanical polishing using sandpapers of different sand grain sizes and chemical coating using electrochemical deposition of Ni and Co. The hydrogen evolution reaction was studied to reveal and compare the apparent and intrinsic activities of the electrodes, as indicated by the Tafel curves based on the geometric surface area and effective surface area, respectively. A relative roughness factor, which was estimated from the double layer capacitance in the impedance measurement, was introduced to characterise the effective surface area. The relative roughness factor of the six modified electrodes varied from 3.3 to 5.6. The electrode polished with the P400 sandpaper achieved the best apparent activity by possessing the lowest overpotential of 422 mV at the current density of 750 A m-2. For electrodes modified by the mechanical polishing, the Tafel curves collapsed into a narrow band when the current density was divided by the relative roughness factor, which validated the method of using the relative roughness factor for quantifying the effective surface area. The intrinsic activity of the hydrogen evolution reaction on Ni electrode can be expressed as η = 0.02 + 0.191·Log(j″), where j″ is the current density based on the effective surface area. For the electrodes modified by electrochemical depositions of Ni and Co, a variation in the intrinsic activity was observed for the different electrodes. This was attributed to their surface composition differences. © 2013 Elsevier Ltd. All rights reserved.

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