One-step electrosynthesis of ethylene and ethanol from CO2 in an alkaline electrolyzer

Sichao Ma, Masaaki Sadakiyo, Raymond Luo, Minako Heima, Miho Yamauchi, Paul J.A. Kenis

    研究成果: Contribution to journalArticle査読

    267 被引用数 (Scopus)

    抄録

    Electroreduction of CO2 has potential for storing otherwise wasted intermittent renewable energy, while reducing emission of CO2 into the atmosphere. Identifying robust and efficient electrocatalysts and associated optimum operating conditions to produce hydrocarbons at high energetic efficiency (low overpotential) remains a challenge. In this study, four Cu nanoparticle catalysts of different morphology and composition (amount of surface oxide) are synthesized and their activities towards CO2 reduction are characterized in an alkaline electrolyzer. Use of catalysts with large surface roughness results in a combined Faradaic efficiency (46%) for the electroreduction of CO2 to ethylene and ethanol in combination with current densities of ∼200 mA cm-2, a 10-fold increase in performance achieved at much lower overpotential (only < 0.7 V) compared to prior work. Compared to prior work, the high production levels of ethylene and ethanol can be attributed mainly to the use of alkaline electrolyte to improve kinetics and the suppressed evolution of H2, as well as the application of gas diffusion electrodes covered with active and rough Cu nanoparticles in the electrolyzer. These high performance levels and the gained fundamental understanding on Cu-based catalysts bring electrochemical reduction processes such as presented here closer to practical application.

    本文言語英語
    ページ(範囲)219-228
    ページ数10
    ジャーナルJournal of Power Sources
    301
    DOI
    出版ステータス出版済み - 1 1 2016

    All Science Journal Classification (ASJC) codes

    • 再生可能エネルギー、持続可能性、環境
    • エネルギー工学および電力技術
    • 物理化学および理論化学
    • 電子工学および電気工学

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