J. Mater. Sci. Technol. ›› 2024, Vol. 201: 157-165.DOI: 10.1016/j.jmst.2024.03.046

• Research Article • Previous Articles     Next Articles

FeNi alloys incorporated N-doped carbon nanotubes as efficient bifunctional electrocatalyst with phase-dependent activity for oxygen and hydrogen evolution reactions

Yu Zhanga, Boyuan Chena, Yanxin Qiaoa,*, Yurong Duanb, Xinyu Qic, Siqi Hea, Hu Zhoua,d,*, Junkang Chena, Aihua Yuane, Shunli Zhengb,*   

  1. aSchool of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China;
    bCollege & Hospital of Stomatology, Key Laboratory of Oral Diseases Research of Anhui Province, Anhui Medical University, Hefei 230032, China;
    cCollege of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China;
    dInstrumental Analysis Center of Jiangsu University of Science and Technology, Zhenjiang 212003, China;
    eSchool of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China
  • Received:2024-01-12 Revised:2024-02-28 Accepted:2024-03-04 Published:2024-12-01 Online:2024-04-06
  • Contact: * E-mail addresses: yxqiao@just.edu.cn (Y.X. Qiao), zhmiao119@sina.com (H. Zhou), zhengshunli1986@126.com (S. Zheng) .

Abstract: Electrochemical oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) are two important half-cell reactions for overall water splitting. The rational design and fabrication of efficient electrocatalysts involving nonprecious-metals and carbon matrix is highly attractive. Herein, a series of N-doped carbon nanotubes encapsulated FeNi alloy nanoparticles (FeNi@NCNTs) are synthesized via a simple pyrolysis treatment of Fe-doped Ni(OH)2 precursors under the assistance of dicyandiamine source. The results reveal that the Fe/Ni ratio has an obvious influence on the morphology and phase composition of FeNi@NCNTs series, thus affecting the electrocatalytic performance. The highest electrocatalytic activity is achieved for the Fe1Ni4@NCNTs product with a Fe/Ni molar ratio of 1:4, which delivers low overpotentials of 278 and 279 mV for OER and HER at 10 mA cm-2 in 1.0 mol/L KOH, respectively. The intriguing electrocatalytic performance is mainly ascribed to the advantageous integration of rambutan-like hierarchically porous structure and composition optimization, significantly facilitating the fast mass/charge transfer as well as promoting the adsorption ability for intermediates. The present method may open a facile avenue for developing cost-effective, high-activity, and stable electrocatalysts for the application of overall water splitting.

Key words: Electrocatalysts, FeNi alloy, Carbon nanotubes, Oxygen evolution reaction, Hydrogen evolution reaction