| Citation: |
Xueting Wu, Lingling Li, Jing Pan, Xiao Wang, Huabin Zhang, et al. CeO2 Modified Ni-MOF as an Efficient Catalyst for Electrocatalytic Urea Oxidation. Materials Lab 2022, 1, 220009. doi: 10.54227/mlab.20220009
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CeO2 Modified Ni-MOF as an Efficient Catalyst for Electrocatalytic Urea Oxidation
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Abstract
The development of cost-efficient electrocatalysts for urea oxidation reaction (UOR) is a challenge due to the slow kinetics. In this work, we demonstrated a one-pot hydrothermal synthetic method to fabricate CeO2 modified Ni-MOF nanosheets (NSs). When evaluted as UOR catalysts, the 3% CeO2/Ni-MOF possesses outstanding catalytic activity, achieving the current density of 10 mA cm−2 at a low potential of 1.356 V with a small Tafel slope of 13.83 mV dec−1. It is considered that the unique interactions between CeO2 nanoparticles (NPs) and Ni-MOF NSs play the significant role in the enhancement of the catalytic performance by inducing the formation of abundant defects and optimized surface states.
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Keywords:
- CeO2 /
- electrocatalyst /
- Ni-MOFs /
- hybrid /
- UOR
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References
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Xueting Wu, Lingling Li, Jing Pan, Xiao Wang, Huabin Zhang, et al. CeO2 Modified Ni-MOF as an Efficient Catalyst for Electrocatalytic Urea Oxidation. Materials Lab 2022, 1, 220009. doi: 10.54227/mlab.20220009
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Figure 1.
(a) Schematic illustration of the formation of CeO2/Ni-MOF. (b, c) SEM images, (d, e) TEM images, (f) HRTEM image and (g) elemental mapping images of 3% CeO2/Ni-MOF.
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Figure 2.
(a) XRD patterns and (b) FT-IR spectra of different catalysts. (c) XPS Ni 2p spectra of Ni-MOF and 3% CeO2/Ni-MOF. (d) XPS Ce 3d spectra of 3% CeO2/Ni-MOF.
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Figure 3.
(a) LSV curves of 3% CeO2/Ni-MOF in 1 M KOH electrolyte with and without 0.33 M urea. (b) LSV curves of CeO2 NPs, Ni-MOF, 1% CeO2/Ni-MOF, 3% CeO2/Ni-MOF and 5% CeO2/Ni-MOF in 1 M KOH electrolyte with 0.33 M urea. (c) Tafel plots, (d) potentials at 10 mA cm−2, (e) mass activity at η = 1.356 V, (f) TOF at η = 1.356 V, (g) current density differences at 0.25 V plotted against scan rate in a non-Faradaic and (h) Nyquist plots recorded at 0.483 V of Ni-MOF, 1% CeO2/Ni-MOF, 3% CeO2/Ni-MOF and 5% CeO2/Ni-MOF. (i) Chronopotentiometry curves of 3% CeO2/Ni-MOF at 10 mA cm−2.
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Figure 4.
XRD patterns of 3% CeO2/Ni-MOF during UOR process.
