CeO2−δ as Electron Donor in Co0.07Ce0.93O2−δ Solid Solution Boosts Alkaline Water Splitting

CeO2−δ as Electron Donor in Co0.07Ce0.93O2−δ Solid Solution Boosts Alkaline Water Splitting

Abstract Optimizing the electronic structure with increasing intrinsic stability is a usual method to enhance the catalysts’ performance. Herein, a series of cerium dioxide (CeO2−δ) based solid solution materials is synthesized via substituting Ce atoms with transition metal (Co, Cu, Ni, etc.), in w...

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Bibliographic Details
Main Authors: Gege Su, Yichao Hou, Jie Yin, Jiayi Yang, Zhenglong Li, Xin Du, Xin Zhang, Pinxian Xi, Chun‐Hua Yan
Format: Article
Language:English
Published: Wiley 2025-01-01
Series:Advanced Science
Subjects:
alkaline water splitting
CeO2−δ
electronic structures
HER
solid solutions
Online Access:https://doi.org/10.1002/advs.202411845
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Summary:Abstract Optimizing the electronic structure with increasing intrinsic stability is a usual method to enhance the catalysts’ performance. Herein, a series of cerium dioxide (CeO2−δ) based solid solution materials is synthesized via substituting Ce atoms with transition metal (Co, Cu, Ni, etc.), in which Co0.07Ce0.93O2−δ shows optimized band structure because of electron transition in the reaction, namely Co3+ (3d64s0) + Ce3+ (4f15d 06s0) → Co2+ (3d74s0) + Ce4+ (4f05d06s0), with more stable electronic configuration. The in situ Raman spectra show a stable F2g peak at ≈452 cm−1 of Co0.07Ce0.93O2−δ, while the F2g peak in CeO2−δ almost disappeared during HER progress, demonstrating the charge distribution of *H adsorbed on Co0.07Ce0.93O2−δ is more stable than *H adsorbed on CeO2−δ. Density functional theory calculations reveal that Co0.07Ce0.93O2−δ solid solution increases protonation capacity and favors for formation of *H in alkaline media. General guidelines are formulated for optimizing adsorption capacity and the volcano plot demonstrates the excellent catalytic performance of Co0.07Ce0.93O2−δ solid solution. The alkaline anion exchange membrane water electrolysis based on Co0.07Ce0.93O2−δ/NiFe LDH realizes a current density of 1000 mA cm−2 at ≈1.86 V in alkaline seawater at 80 °C and exhibits long‐term stability for 450 h.
ISSN:2198-3844

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