Crystal structure and surface characteristics of Sr-doped GdBaCo2O6−δ double perovskites : oxygen evolution reaction and conductivity
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 wo...
| Main Authors: | , , , , , , , , , , , , |
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| Format: | Journal Article |
| Language: | English |
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2019
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| Online Access: | https://hdl.handle.net/10356/81762 http://hdl.handle.net/10220/47975 |
| _version_ | 1826115612593618944 |
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| author | Pramana, Stevin S. Cavallaro, Andrea Li, Cheng Handoko, Albertus D. Chan, Kuang Wen Walker, Robert J. Regoutz, Anna Herrin, Jason Scott Yeo, Boon Siang Payne, David J. Kilner, John A. Ryan, Mary P. Skinner, Stephen J. |
| author2 | Earth Observatory of Singapore |
| author_facet | Earth Observatory of Singapore Pramana, Stevin S. Cavallaro, Andrea Li, Cheng Handoko, Albertus D. Chan, Kuang Wen Walker, Robert J. Regoutz, Anna Herrin, Jason Scott Yeo, Boon Siang Payne, David J. Kilner, John A. Ryan, Mary P. Skinner, Stephen J. |
| author_sort | Pramana, Stevin S. |
| collection | NTU |
| description | 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 d 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 d with increasing Sr content was found to crystallise in the higher symmetry tetragonal P4/mmm space group in comparison with the undoped GdBaCo2O6 d 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. |
| first_indexed | 2024-10-01T03:58:20Z |
| format | Journal Article |
| id | ntu-10356/81762 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T03:58:20Z |
| publishDate | 2019 |
| record_format | dspace |
| spelling | ntu-10356/817622020-09-26T21:27:43Z Crystal structure and surface characteristics of Sr-doped GdBaCo2O6−δ double perovskites : oxygen evolution reaction and conductivity Pramana, Stevin S. Cavallaro, Andrea Li, Cheng Handoko, Albertus D. Chan, Kuang Wen Walker, Robert J. Regoutz, Anna Herrin, Jason Scott Yeo, Boon Siang Payne, David J. Kilner, John A. Ryan, Mary P. Skinner, Stephen J. Earth Observatory of Singapore DRNTU::Science::Chemistry Conductivity Crystal Structure 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 d 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 d with increasing Sr content was found to crystallise in the higher symmetry tetragonal P4/mmm space group in comparison with the undoped GdBaCo2O6 d 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. Published version 2019-04-04T06:46:23Z 2019-12-06T14:40:05Z 2019-04-04T06:46:23Z 2019-12-06T14:40:05Z 2018 Journal Article Pramana, S. S., Cavallaro, A., Li, C., Handoko, A. D., Chan, K. W., Walker, R. J., … Skinner, S. J. (2018). Crystal structure and surface characteristics of Sr-doped GdBaCo2O6−δ double perovskites : oxygen evolution reaction and conductivity. Journal of Materials Chemistry A, 6(13), 5335-5345. doi:10.1039/C7TA06817D 2050-7488 https://hdl.handle.net/10356/81762 http://hdl.handle.net/10220/47975 10.1039/C7TA06817D en Journal of Materials Chemistry A © 2018 The Authors (The Royal Society of Chemistry). This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. 11 p. application/pdf |
| spellingShingle | DRNTU::Science::Chemistry Conductivity Crystal Structure Pramana, Stevin S. Cavallaro, Andrea Li, Cheng Handoko, Albertus D. Chan, Kuang Wen Walker, Robert J. Regoutz, Anna Herrin, Jason Scott Yeo, Boon Siang Payne, David J. Kilner, John A. Ryan, Mary P. Skinner, Stephen J. Crystal structure and surface characteristics of Sr-doped GdBaCo2O6−δ double perovskites : oxygen evolution reaction and conductivity |
| title | Crystal structure and surface characteristics of Sr-doped GdBaCo2O6−δ double perovskites : oxygen evolution reaction and conductivity |
| title_full | Crystal structure and surface characteristics of Sr-doped GdBaCo2O6−δ double perovskites : oxygen evolution reaction and conductivity |
| title_fullStr | Crystal structure and surface characteristics of Sr-doped GdBaCo2O6−δ double perovskites : oxygen evolution reaction and conductivity |
| title_full_unstemmed | Crystal structure and surface characteristics of Sr-doped GdBaCo2O6−δ double perovskites : oxygen evolution reaction and conductivity |
| title_short | Crystal structure and surface characteristics of Sr-doped GdBaCo2O6−δ double perovskites : oxygen evolution reaction and conductivity |
| title_sort | crystal structure and surface characteristics of sr doped gdbaco2o6 δ double perovskites oxygen evolution reaction and conductivity |
| topic | DRNTU::Science::Chemistry Conductivity Crystal Structure |
| url | https://hdl.handle.net/10356/81762 http://hdl.handle.net/10220/47975 |
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