Journal of Jilin University(Engineering and Technology Edition) ›› 2025, Vol. 55 ›› Issue (10): 3162-3168.doi: 10.13229/j.cnki.jdxbgxb.20231459

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Effect of Ni content on performance of Ni/3YSZ electrolyte fabricated by fast hot-pressing sintering

Yue YANG(),En-ze LI,Zheng ZHANG   

  1. School of Materials Science and Engineering，Changchun University of Technology，Changchun 130012，China
  • Received:2023-12-11 Online:2025-10-01 Published:2026-02-03

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Abstract:

In this paper， fast hot-pressing sintering process assisted by an electric field was employed to fabricate Ni-doped 3 mol% yttria-stabilized zirconia（3YSZ） solid-state electrolytes. The effects of Ni doping content ranging from 3% to 8% on the phase composition， microstructure， densification， and ionic conductivity of the sintered products were investigated. The research findings indicate that when the Ni doping content is 5%， under process parameters of constant pressure at 20 MPa， heating rate 60 ℃/min to 1 200 ℃， hold for 10 min， the Ni/3YSZ grains are tightly packed with a relative density of up to 98%. At a test temperature of 300 ℃， the ionic conductivity reaches 6.24 μS/cm. By utilizing the multiphysics coupling software COMSOL， a three-dimensional multi-channel cross-flow steady-state single cell model was established， taking the multi-channel planar anode-supported solid oxide fuel cell（SOFC） as the research subject. The electrical conductivity of the prepared 3YSZ/Ni solid-state electrolytes with different Ni contents was evaluated， and the power density achieved could reach 22 W/m2. This provides a new approach to enhancing the low-temperature performance of SOFC electrolytes.

Key words: materials processing technology, solid-state electrolyte, fast hot-pressing sintering, ionic conductivity, doping

CLC Number: 

  • TB34

Fig.1

XRD spectra of 3YSZ samples sintered at different Ni concentrations"

Fig.2

Low magnification SEM of sintered sample cross-sections with different Ni concentrations"

Table 1

Ionic conductivity and relative density of sintered 3YSZ samples at different Ni concentrations"

掺杂浓度/%离子电导率/（s·cm-1）相对密度/%
32.6193.5
56.2498.0
82.0495.4

Fig.3

Typical electrochemical impedance spectra of sintered samples at different Ni concentrations"

Fig.4

NiO-5% sample parameter simulation potential distribution"

Fig.5

Velocity field distribution under NiO-5% sample parameter simulation"

Fig.6

Temperature and isothermal lines distribution of NiO-5% sample parameter simulation"

Fig.7

Gas concentration distribution diagram of NiO-5% sample parameter simulation"

Fig.8

Simulation results of single-cell performanceunder different Ni content sampleparameters simulation"

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