In situ formation of molecular Ni-Fe active sites on heteroatom-doped graphene as a heterogeneous electrocatalyst toward oxygen evolution
Molecularly well-defined Ni sites at heterogeneous interfaces were derived from the incorporation of Ni2+ ions into heteroatom-doped graphene. The molecular Ni sites on graphene were redox-active. However, they showed poor activity toward oxygen evolution reaction (OER) in KOH aqueous solution. We d...
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sg-ntu-dr.10356-856012023-12-29T06:51:34Z In situ formation of molecular Ni-Fe active sites on heteroatom-doped graphene as a heterogeneous electrocatalyst toward oxygen evolution Wang, Jiong Gan, Liyong Zhang, Wenyu Peng, Yuecheng Yu, Hong Yan, Qingyu Xia, Xinghua Wang, Xin School of Chemical and Biomedical Engineering School of Materials Science & Engineering Oxygen Evolution Reaction (OER) Heteroatom-doped Graphene Molecularly well-defined Ni sites at heterogeneous interfaces were derived from the incorporation of Ni2+ ions into heteroatom-doped graphene. The molecular Ni sites on graphene were redox-active. However, they showed poor activity toward oxygen evolution reaction (OER) in KOH aqueous solution. We demonstrated for the first time that the presence of Fe3+ ions in the solution could bond at the vicinity of the Ni sites with a distance of 2.7 Å, generating molecularly sized and heterogeneous Ni-Fe sites anchored on doped graphene. These Ni-Fe sites exhibited markedly improved OER activity. The Pourbaix diagram confirmed the formation of the Ni-Fe sites and revealed that the Ni-Fe sites adsorbed HO− ions with a bridge geometry, which facilitated the OER electrocatalysis. NRF (Natl Research Foundation, S’pore) MOE (Min. of Education, S’pore) Published version 2018-07-23T06:19:44Z 2019-12-06T16:06:55Z 2018-07-23T06:19:44Z 2019-12-06T16:06:55Z 2018 Journal Article Wang, J., Gan, L., Zhang, W., Peng, Y., Yu, H., Yan, Q., et al. (2018). In situ formation of molecular Ni-Fe active sites on heteroatom-doped graphene as a heterogeneous electrocatalyst toward oxygen evolution. Science Advances, 4(3), eaap7970-. https://hdl.handle.net/10356/85601 http://hdl.handle.net/10220/45173 10.1126/sciadv.aap7970 en Science Advances © 2018 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC). This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license, which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited. 8 p. application/pdf |
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Oxygen Evolution Reaction (OER) Heteroatom-doped Graphene |
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Oxygen Evolution Reaction (OER) Heteroatom-doped Graphene Wang, Jiong Gan, Liyong Zhang, Wenyu Peng, Yuecheng Yu, Hong Yan, Qingyu Xia, Xinghua Wang, Xin In situ formation of molecular Ni-Fe active sites on heteroatom-doped graphene as a heterogeneous electrocatalyst toward oxygen evolution |
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Molecularly well-defined Ni sites at heterogeneous interfaces were derived from the incorporation of Ni2+ ions into heteroatom-doped graphene. The molecular Ni sites on graphene were redox-active. However, they showed poor activity toward oxygen evolution reaction (OER) in KOH aqueous solution. We demonstrated for the first time that the presence of Fe3+ ions in the solution could bond at the vicinity of the Ni sites with a distance of 2.7 Å, generating molecularly sized and heterogeneous Ni-Fe sites anchored on doped graphene. These Ni-Fe sites exhibited markedly improved OER activity. The Pourbaix diagram confirmed the formation of the Ni-Fe sites and revealed that the Ni-Fe sites adsorbed HO− ions with a bridge geometry, which facilitated the OER electrocatalysis. |
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School of Chemical and Biomedical Engineering |
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School of Chemical and Biomedical Engineering Wang, Jiong Gan, Liyong Zhang, Wenyu Peng, Yuecheng Yu, Hong Yan, Qingyu Xia, Xinghua Wang, Xin |
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Article |
author |
Wang, Jiong Gan, Liyong Zhang, Wenyu Peng, Yuecheng Yu, Hong Yan, Qingyu Xia, Xinghua Wang, Xin |
author_sort |
Wang, Jiong |
title |
In situ formation of molecular Ni-Fe active sites on heteroatom-doped graphene as a heterogeneous electrocatalyst toward oxygen evolution |
title_short |
In situ formation of molecular Ni-Fe active sites on heteroatom-doped graphene as a heterogeneous electrocatalyst toward oxygen evolution |
title_full |
In situ formation of molecular Ni-Fe active sites on heteroatom-doped graphene as a heterogeneous electrocatalyst toward oxygen evolution |
title_fullStr |
In situ formation of molecular Ni-Fe active sites on heteroatom-doped graphene as a heterogeneous electrocatalyst toward oxygen evolution |
title_full_unstemmed |
In situ formation of molecular Ni-Fe active sites on heteroatom-doped graphene as a heterogeneous electrocatalyst toward oxygen evolution |
title_sort |
in situ formation of molecular ni-fe active sites on heteroatom-doped graphene as a heterogeneous electrocatalyst toward oxygen evolution |
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2018 |
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https://hdl.handle.net/10356/85601 http://hdl.handle.net/10220/45173 |
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1787136729749127168 |