Catalyst Support Effect on the Activity and Durability of Magnetic Nanoparticles: Toward Design of Advanced Electrocatalyst for Full Water Splitting

Fatemeh Davodi, Elisabeth Mühlhausen, Mohammad Tavakkoli, Jani Sainio, Hua Jiang, Bilal Gökce, Galina Marzun, Tanja Kallio*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

21 Citations (Scopus)
183 Downloads (Pure)

Abstract

Earth-abundant element-based inorganic-organic hybrid materials are attractive alternatives for electrocatalyzing energy conversion reactions. Such material structures do not only increase the surface area and stability of metal nanoparticles (NPs) but also modify the electrocatalytic performance. Here, we introduce, for the first time, multiwall carbon nanotubes (MWNTs) functionalized with nitrogen-rich emeraldine salt (ES) (denoted as ES-MWNT) as a promising catalyst support to boost the electrocatalytic activity of magnetic maghemite (γ-Fe2O3) NPs. The latter component has been synthesized by a simple and upscalable one-step pulsed laser ablation method on Ni core forming the core-shell Niγ-Fe2O3 NPs. The catalyst (Niγ-Fe2O3/ES-MWNT) is formed via self-assembly as strong interaction between ES-MWNT and Niγ-Fe2O3 results in NPs' encapsulation in a thin C-N shell. We further show that Ni does not directly function as an active site in the electrocatalyst but it has a crucial role in synthesizing the maghemite shell. The strong interaction between the NPs and the support improves notably the NPs' catalytic activity toward oxygen evolution reaction (OER) in terms of both onset potential and current density, ranking it among the most active catalysts reported so far. Furthermore, this material shows a superior durability to most of the current excellent OER electrocatalysts as the activity, and the structure, remains almost intact after 5000 OER stability cycles. On further characterization, the same trend has been observed for hydrogen evolution reaction, the other half-reaction of water splitting.

Original languageEnglish
Pages (from-to)31300-31311
Number of pages12
JournalACS Applied Materials and Interfaces
Volume10
Issue number37
DOIs
Publication statusPublished - 19 Sep 2018
MoE publication typeA1 Journal article-refereed

Keywords

  • carbon nanotubes
  • catalyst support
  • core-shell nanoparticles
  • maghemite (γ-FeO)
  • polymer functionalization
  • self-assembly
  • water splitting

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    Rational design of non-noble metal (electro)catalyst materials for energy conversion applications

    Kallio, T., Lahtinen, K., Davodi, F. & Mehrabimatin, B.

    01/01/201531/12/2018

    Project: Academy of Finland: Other research funding

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    Anna Rissanen (Manager)

    Aalto University

    Facility/equipment: Facility

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