Imperial College London
Alternate

Professor Jason Riley

Faculty of Engineering, Department of Materials

Vice-Dean (Education) for the Faculty of Engineering
 
 
 
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Contact

 

+44 (0)20 7594 6751jason.riley

 
 
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Location

 

B3.37Bessemer BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Zhang:2022:10.1002/advs.202200146,
author = {Zhang, H and Geng, S and Ouyang, M and Yadegari, H and Xie, F and Riley, DJ},
doi = {10.1002/advs.202200146},
journal = {Advanced Science},
pages = {1--15},
title = {A self-reconstructed bifunctional electrocatalyst of pseudo-amorphous nickel carbide @ iron oxide network for seawater splitting.},
url = {http://dx.doi.org/10.1002/advs.202200146},
volume = {9},
year = {2022}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Here, a sol-gel method is used to prepare a Prussian blue analogue (NiFe-PBA) precursor with a 2D network, which is further annealed to an Fe3 O4 /NiCx composite (NiFe-PBA-gel-cal), inheriting the ultrahigh specific surface area of the parent structure. When the composite is used as both anode and cathode catalyst for overall water splitting, it requires low voltages of 1.57 and 1.66 V to provide a current density of 100 mA cm-2 in alkaline freshwater and simulated seawater, respectively, exhibiting no obvious attenuation over a 50 h test. Operando Raman spectroscopy and X-ray photoelectron spectroscopy indicate that NiOOH2-x active species containing high-valence Ni3+ /Ni4+ are in situ generated from NiCx during the water oxidation. Density functional theory calculations combined with ligand field theory reveal that the role of high valence states of Ni is to trigger the production of localized O 2p electron holes, acting as electrophilic centers for the activation of redox reactions for oxygen evolution reaction. After hydrogen evolution reaction, a series of ex situ and in situ investigations indicate the reduction from Fe3+ to Fe2+ and the evolution of Ni(OH)2 are the origin of the high activity.
AU  - Zhang,H
AU  - Geng,S
AU  - Ouyang,M
AU  - Yadegari,H
AU  - Xie,F
AU  - Riley,DJ
DO  - 10.1002/advs.202200146
EP  - 15
PY  - 2022///
SN  - 2198-3844
SP  - 1
TI  - A self-reconstructed bifunctional electrocatalyst of pseudo-amorphous nickel carbide @ iron oxide network for seawater splitting.
T2  - Advanced Science
UR  - http://dx.doi.org/10.1002/advs.202200146
UR  - https://www.ncbi.nlm.nih.gov/pubmed/35338616
UR  - https://onlinelibrary.wiley.com/doi/10.1002/advs.202200146
UR  - http://hdl.handle.net/10044/1/96155
VL  - 9
ER  -
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