Imperial College London

ProfessorMaryRyan

Faculty of EngineeringDepartment of Materials

Vice-Dean (Research), Faculty of Engineering
 
 
 
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Contact

 

+44 (0)20 7594 6755m.p.ryan

 
 
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Location

 

B338Royal School of MinesSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Skinner:2017:10.1039/c7ta06817d,
author = {Skinner, SJ and ryan, MP and pramana, S and cavallaro, A and li, C and handoko, A and Chan, KW and walker, RJ and Regoutz, A and herrin, J and Yeo, BS and Payne, DJ and kilner, JA},
doi = {10.1039/c7ta06817d},
journal = {Journal of Materials Chemistry A},
pages = {5335--5345},
title = {Crystal structure and surface characteristics of Sr-doped GdBaCo2O6-δ double perovskites: oxygen evolution reaction and conductivity},
url = {http://dx.doi.org/10.1039/c7ta06817d},
volume = {6},
year = {2017}
}

RIS format (EndNote, RefMan)

TY  - JOUR
AB - A cheap and direct solution towards engineering better catalysts through identification of novel materials is required for a sustainable energy system. Perovskite oxides have emerged as potential candidates to replace the less economically attractive Pt and IrO2 water splitting catalysts. In this work, excellent electrical conductivity (980 S cm−1) was found for the double perovskite of composition GdBa0.6Sr0.4Co2O6−δ which is consistent with a better oxygen evolution reaction activity with the onset polarisation of 1.51 V with respect to a reversible hydrogen electrode (RHE). GdBa1−xSrxCo2O6−δ with increasing Sr content was found to crystallise in the higher symmetry tetragonal P4/mmm space group in comparison with the undoped GdBaCo2O6−δ which is orthorhombic (Pmmm), and yields higher oxygen uptake, accompanied by higher Co oxidation states. This outstanding electrochemical performance is explained by the wider carrier bandwidth, which is a function of Co–O–Co buckling angles and Co–O bond lengths. Furthermore the higher oxygen evolution activity was observed despite the formation of non-lattice oxides (mainly hydroxide species) and enrichment of alkaline earth ions on the surface.
AU - Skinner,SJ
AU - ryan,MP
AU - pramana,S
AU - cavallaro,A
AU - li,C
AU - handoko,A
AU - Chan,KW
AU - walker,RJ
AU - Regoutz,A
AU - herrin,J
AU - Yeo,BS
AU - Payne,DJ
AU - kilner,JA
DO - 10.1039/c7ta06817d
EP - 5345
PY - 2017///
SN - 2050-7496
SP - 5335
TI - Crystal structure and surface characteristics of Sr-doped GdBaCo2O6-δ double perovskites: oxygen evolution reaction and conductivity
T2 - Journal of Materials Chemistry A
UR - http://dx.doi.org/10.1039/c7ta06817d
UR - http://hdl.handle.net/10044/1/52086
VL - 6
ER -