Ionic Liquid-Assisted Synthesis of Ce-Doped NiCo-Based Composite Electrocatalysts for Hydrogen Evolution
- 1Shenyang Institute of Science and Technology , , , ,
- 2Liaoning University , , , ,
- 3Zaozhuang University , , , ,
Abstract
Developing efficient and low-cost electrocatalysts is an urgent need for water splitting. Water splitting relies on a wide range of catalysts. Owing to its flexible coordination chemistry and outstanding redox properties, cerium (Ce) not only functions as an active catalyst on its own but also serves as an effective promoter for other catalytic species. This paper prepared NiCo-PBA based on the “nanoregions” formed in an ionic liquid mixture system, synthesized Ce-doped nickel–cobalt-based Prussian blue analogues through ion exchange reactions, and successfully prepared porous composite materials CeNiCo@NC with different Ce contents by calcination in an inert atmosphere. The research results show that the resulting Ce-doped NiCo@NC materials with rationally optimized Ce contents deliver remarkable HER activity, making them promising candidates as efficient water-splitting catalysts. In particular, CeNiCo@NC-3 exhibits the highest electrocatalytic performance among the series, delivering 10 mA cm–2 at only 99 mV overpotential, 57 mV (36.5%) lower than that of Ce-free NiCo@NC-500. Additionally, its Tafel slope of 61 mV dec–1 corresponds to a 15.3% improvement over NiCo@NC-500. The origin of this enhanced activity lies in the enlarged electrochemically active surface area, expedited charge transfer, and the promotion of Ce3+ ↔ Ce4+ conversion in CeO2 after the introduction of Ce.
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BibTeX
@article{fu2026ionic,
title = {{Ionic Liquid-Assisted Synthesis of Ce-Doped NiCo-Based Composite Electrocatalysts for Hydrogen Evolution}},
author = {Donglu Fu and Sile Liu and Feng Yan and Yi Shan and Xin He and Huan Wang and Yuna Zhang and Zongren Song and Kunhao Liang},
journal = {ACS Omega},
year = {2026},
month = oct,
doi = {10.1021/acsomega.6c08881},
url = {https://pubs.acs.org/acsodf/article/11/42/65691/5452302/Ionic-Liquid-Assisted-Synthesis-of-Ce-Doped-NiCo},
note = {CC BY-NC-ND 4.0},
}
RIS
TY - JOUR
TI - Ionic Liquid-Assisted Synthesis of Ce-Doped NiCo-Based Composite Electrocatalysts for Hydrogen Evolution
AU - Donglu Fu
AU - Sile Liu
AU - Feng Yan
AU - Yi Shan
AU - Xin He
AU - Huan Wang
AU - Yuna Zhang
AU - Zongren Song
AU - Kunhao Liang
PY - 2026
DA - 2026/10/15
JO - ACS Omega
DO - 10.1021/acsomega.6c08881
UR - https://pubs.acs.org/acsodf/article/11/42/65691/5452302/Ionic-Liquid-Assisted-Synthesis-of-Ce-Doped-NiCo
AB - Developing efficient and low-cost electrocatalysts is an urgent need for water splitting. Water splitting relies on a wide range of catalysts. Owing to its flexible coordination chemistry and outstanding redox properties, cerium (Ce) not only functions as an active catalyst on its own but also serves as an effective promoter for other catalytic species. This paper prepared NiCo-PBA based on the “nanoregions” formed in an ionic liquid mixture system, synthesized Ce-doped nickel–cobalt-based Prussian blue analogues through ion exchange reactions, and successfully prepared porous composite materials CeNiCo@NC with different Ce contents by calcination in an inert atmosphere. The research results show that the resulting Ce-doped NiCo@NC materials with rationally optimized Ce contents deliver remarkable HER activity, making them promising candidates as efficient water-splitting catalysts. In particular, CeNiCo@NC-3 exhibits the highest electrocatalytic performance among the series, delivering 10 mA cm–2 at only 99 mV overpotential, 57 mV (36.5%) lower than that of Ce-free NiCo@NC-500. Additionally, its Tafel slope of 61 mV dec–1 corresponds to a 15.3% improvement over NiCo@NC-500. The origin of this enhanced activity lies in the enlarged electrochemically active surface area, expedited charge transfer, and the promotion of Ce3+ ↔ Ce4+ conversion in CeO2 after the introduction of Ce.
SN - 2470-1343
ER -