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...

Full description

Saved in:
Bibliographic Details
Main Authors: Wang, Jiong, Gan, Liyong, Zhang, Wenyu, Peng, Yuecheng, Yu, Hong, Yan, Qingyu, Xia, Xinghua, Wang, Xin
Other Authors: School of Chemical and Biomedical Engineering
Format: Article
Language:English
Published: 2018
Subjects:
Online Access:https://hdl.handle.net/10356/85601
http://hdl.handle.net/10220/45173
Tags: Add Tag
No Tags, Be the first to tag this record!
Institution: Nanyang Technological University
Language: English
id sg-ntu-dr.10356-85601
record_format dspace
spelling 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
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Oxygen Evolution Reaction (OER)
Heteroatom-doped Graphene
spellingShingle 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
description 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.
author2 School of Chemical and Biomedical Engineering
author_facet School of Chemical and Biomedical Engineering
Wang, Jiong
Gan, Liyong
Zhang, Wenyu
Peng, Yuecheng
Yu, Hong
Yan, Qingyu
Xia, Xinghua
Wang, Xin
format 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
publishDate 2018
url https://hdl.handle.net/10356/85601
http://hdl.handle.net/10220/45173
_version_ 1787136729749127168