J. Mater. Sci. Technol. ›› 2025, Vol. 207: 1-9.DOI: 10.1016/j.jmst.2024.04.026

• Research article •     Next Articles

Triple-function Mn regulation of NiFe (oxy)hydroxide for oxygen evolution reaction

Hui Wan, Meng-Yuan Xiea, Bo Lia, Jian-Hang Niea, Tao Huanga, Lei Lia, Jing-Hui Shia, Ming-Hua Xiana, Jia-Rong Huanga, Wangyu Huc, Gui-Fang Huanga,*, Fei Gaod,*, Wei-Qing Huanga,*   

  1. aDepartment of Applied Physics, School of Physics and Electronics, Hunan University, Changsha 410082, China;
    bSchool of Materials and Environmental Engineering, Changsha University, Changsha 410082, China;
    cCollege of Materials Science and Engineering, Hunan University, Changsha 410082, China;
    dDepartment of Nuclear Engineering and Radiological Sciences, University of Michigan, Ann Arbor, MI 48109, USA
  • Received:2024-01-19 Revised:2024-04-15 Accepted:2024-04-16 Published:2025-02-01 Online:2024-05-12
  • Contact: *E-mail addresses: gfhuang@hnu.edu.cn (G.-F. Huang), gaofeium@umich.edu (F. Gao), wqhuang@hnu.edu.cn (W.-Q. Huang)

Abstract: Transition metal (oxy)hydroxides are potential oxygen evolution reaction (OER) electrocatalysts; however, simultaneously modulating multiple factors to enhance their performance is a grand challenge. Here, we report an incorporating heteroatom strategy via one-step hydrothermal approach to adjust more than one factor of Mn-doped NiFe (oxy)hydroxide (Mn-NiFeOOH/LDH) heterojunction. Mn doping regulates heterojunction morphology (reducing nanoparticles and becoming thinner and denser nanosheets), Ni/Fe ratio and valence states (Ni2+, Ni3+, and Ni3+Δ) of Ni ions. The former could effectively increase surface active sites, and the latter two reduce the content of Fe in the Mnx-NiFeOOH/LDH heterojunction, enabling more Ni2+ convert to Ni3+/3+Δ that have higher intrinsic OER activity. As a result, the first-rank Mn-NiFeOOH/LDH with ultra-low overpotential of 185 mV@20 mA cm-2 and 296 mV@500 mA cm-2, and the improved OER performance are outdo to those of commercial RuO2 catalyst for OER. Moreover, the Mn-NiFeOOH/LDH affords the earliest initial potential (1.392 V vs. RHE), corresponds to a recorded low overpotential (162 mV). Based on the density functional theory (DFT), Mn dopants can alter intermediate adsorption energy and effectively decrease *OOH's energy barrier. This research exhibits a feasible strategy to design low cost electrocatalysts and provide new possibilities for future industrialization.

Key words: Electrocatalysts, Triple-function, Heteroatoms adjusting, DFT, Oxygen evolution reaction