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. 2022 Oct 7:10:996560.
doi: 10.3389/fchem.2022.996560. eCollection 2022.

A facile synthesis of CeO2 from the GO@Ce-MOF precursor and its efficient performance in the oxygen evolution reaction

Wasif Mahmood Ahmed Malik  1   2 , Sheereen Afaq  1 , Azhar Mahmood  3 , Li Niu  3 , Muhammad Yousaf Ur Rehman  1 , Muhammad Ibrahim  4 , Abrar Mohyuddin  2 , Ashfaq Mahmood Qureshi  5 , Muhammad Naeem Ashiq  1 , Adeel Hussain Chughtai  1
Affiliations

A facile synthesis of CeO2 from the GO@Ce-MOF precursor and its efficient performance in the oxygen evolution reaction

Wasif Mahmood Ahmed Malik et al. Front Chem. .

Abstract

Electrochemical water splitting has enticed fascinating consideration as a key conduit for the advancement of renewable energy systems. Fabricating adequate electrocatalysts for water splitting is fervently preferred to curtail their overpotentials and hasten practical utilizations. In this work, a series of Ce-MOF, GO@Ce-MOF, calcinated Ce-MOF, and calcinated GO@Ce-MOF were synthesized and used as high-proficient electrocatalysts for the oxygen evolution reaction. The physicochemical characteristics of the prepared samples were measured by diverse analytical techniques including SEM, HRTEM, FTIR, BET, XPS, XRD, and EDX. All materials underwent cyclic voltammetry tests and were evaluated by electrochemical impedance spectroscopy and oxygen evolution reaction. Ce-MOF, GO@Ce-MOF, calcinated Ce-MOF, and calcinated GO@Ce-MOF have remarkable properties such as enhanced specific surface area, improved catalytic performance, and outstanding permanency in the alkaline solution (KOH). These factors upsurge ECSA and intensify the OER performance of the prepared materials. More exposed surface active-sites present in calcinated GO@Ce-MOF could be the logic for superior electrocatalytic activity. Chronoamperometry of the catalyst for 15°h divulges long-term stability of Ce-MOF during OER. Impedance measurements indicate higher conductivity of synthesized catalysts, facilitating the charge transfer reaction during electrochemical water splitting. This study will open up a new itinerary for conspiring highly ordered MOF-based surface active resources for distinct electrochemical energy applications.

Keywords: GO composites; MOF (metal–organic framework); cerium (3+); oxygen evolution reaction; water splitting.

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Conflict of interest statement

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Figures

SCHEME 1
SCHEME 1
Schematic of Ce-MOF, GO@Ce-MOF, calcinated Ce-MOF, and calcinated GO@Ce-MOF and their OER study.
FIGURE 1
FIGURE 1
(A) FTIR of BTC linker (b) and Ce-MOF, (B) FTIR of Ce-MOF, GO, and GO@Ce- MOF, and (C) FTIR of Ce-MOF, GO@Ce-MOF, and calcinated GO@Ce-MOF (CeO2).
FIGURE 2
FIGURE 2
Powder X-ray diffraction patterns of GO, Ce-MOF, GO@Ce-MOF, and CeO2.
FIGURE 3
FIGURE 3
SEM images for (A,B) Ce-MOF and (C,D) GO@Ce-MOF composite.
FIGURE 4
FIGURE 4
HRTEM images of Ce-MOF (A,B) and EDS elemental mapping (C–F).
FIGURE 5
FIGURE 5
HRTEM images of GO@Ce-MOF composite (A,B) and EDS elemental mapping (C–F).
FIGURE 6
FIGURE 6
Nitrogen sorption isotherm of Ce-MOF.
FIGURE 7
FIGURE 7
BET surface area plot of Ce-MOF representing surface area, slope: Y-intercept, and correlation coefficient.
FIGURE 8
FIGURE 8
XPS survey spectra for Ce-MOF (A) and spectra of O1s (B), C1s (C), and Ce3d (D).
FIGURE 9
FIGURE 9
(A) CV, (B) LSV, and (C) Tafel slopes.
FIGURE 10
FIGURE 10
(A) Stability of calcinated Ce-MOF and (B) electrochemical impedance studies.
FIGURE 11
FIGURE 11
ECSA graph of Ce-MOF and straight line plot of scan rate vs. Δj (A,B) and ECSA graph of calcinated Ce-MOF and straight line plot of scan rate vs. Δj (C,D).
See this image and copyright information in PMC

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