J. Mater. Sci. Technol. ›› 2023, Vol. 143: 20-29.DOI: 10.1016/j.jmst.2022.09.043

• Research Article • Previous Articles     Next Articles

Ligand-free monophasic CuPd alloys endow boosted reaction kinetics toward energy-efficient hydrogen fuel production paired with hydrazine oxidation

Yujeong Jeonga,1, Shreyanka Shankar Naika,1, Yiseul Yua,1, Jayaraman Theerthagiria, Seung Jun Leeb, Pau Loke Showc,d, Hyun Chul Choie,**, Myong Yong Choia,b,*   

  1. aDepartment of Chemistry (BK21 FOUR), Research Institute of Natural Sciences, Gyeongsang National University, Jinju 52828, Republic of Korea
    bCore-Facility Center for Photochemistry & Nanomaterials, Gyeongsang National University, Jinju 52828, Republic of Korea
    cZhejiang Provincial Key Laboratory for Subtropical Water Environment and Marine Biological Resources Protection, Wenzhou University, Wenzhou 325035, China
    dDepartment of Chemical and Environmental Engineering, Faculty of Science and Engineering, University of Nottingham Malaysia, Jalan Broga, 43500 Semenyih, Selangor Darul Ehsan, Malaysia
    eDepartment of Chemistry, Chonnam National University, Gwangju 61186, Republic of Korea
  • Received:2022-07-08 Revised:2022-07-08 Accepted:2022-07-08 Online:2023-04-14
  • Contact: *Department of Chemistry (BK21 FOUR), Research In-stitute of Natural Sciences, Gyeongsang National University, Jinju 52828, Republic of Korea.**E-mail addresses: chc12@chonnam.ac.kr (H.C. Choi), mychoi@gnu.ac.kr (M.Y. Choi).
  • About author:1These authors contributed equally to this work.

Abstract: Optimizing the structure and components is a prevalent strategy for increasing electrocatalytic energy-saving H2 fuel production. One of the sustainable and efficient techniques is electrocatalytic water splitting for H2 generation, but it is still restricted by the kinetically sluggish OER. Due to the lower standard oxidation potential of -0.33 V, replacing the OER with anodic hydrazine oxidation reaction (HzOR) is an effective way to extensively reduce the use of electricity in water electrolysis. Through alloying, the semiconductor and adsorption characteristics of Cu, interlaced by Pd2+ solution on the Pd surface by pulsed laser ablation (PLA) in methanol, are selectively altered to maximize cathodic HER and anodic HzOR performance. The optimal Cu1Pd3/C ratio demonstrates outstanding HER performance with a low overpotential of 0.315 V at 10 mA cm-2, as well as an ultralow overpotential of 0.560 V for HzOR in 0.5 M N2H4/1.0 M KOH. Furthermore, the constructed HzOR-assisted electrolyzer cell with Cu1Pd3/C ∥ Cu1Pd3/C as anode and cathode exhibits a cell voltage of 0.505 V at 10 mA cm-2 with exceptional endurance over 5 h. The current study advances competent CuPd alloys as multifunctional electrocatalysts for H2 fuel production using a HzOR-assisted energy-efficient electrolyzer.

Key words: PLA, CuPd alloy, Sonochemical process, HzOR, Hydrazine evolution reaction, Hydrazine splitting, Water splitting