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Active-Site-Enriched Iron-Doped Nickel/Cobalt Hydroxide Nanosheets for Enhanced Oxygen Evolution Reaction

Journal Article


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Abstract


  • Highly active, durable, and inexpensive nanostructured catalysts are crucial for achieving efficient and economical electrochemical water splitting. However, developing efficient approaches to further improve the catalytic ability of the well-defined nanostructured catalysts is still a big challenge. Herein, we report a facile and universal cation-exchange process for synthesizing Fe-doped Ni(OH)2 and Co(OH)2 nanosheets with enriched active sites toward enhanced oxygen evolution reaction (OER). In comparison with typical NiFe layered double hydroxide (LDH) nanosteets prepared by the conventional one-pot method, Fe-doped Ni(OH)2 nanosheets evolving from Ni(OH)2 via an Fe3+/Ni2+ cation-exchange process possess nanoporous surfaces with abundant defects. Accordingly, Fe-doped Ni(OH)2 nanosheets exhibit higher electrochemical active surface area (ECSA) and improved surface wettability in comparison to NiFe LDH nanosheets and deliver significantly enhanced catalytic activity over NiFe LDH. Specifically, a low overpotential of only 245 mV is required to reach a current density of 10 mA cm–2 for Ni0.83Fe0.17(OH)2 nanosheets with a low Tafel slope of 61 mV dec–1, which is greatly decreased in comparison with those of NiFe LDH (310 mV and 78 mV dec–1). Additionally, this cation-exchange process is successfully extended to prepare Fe-doped Co(OH)2 nanosheets with improved catalytic activity for oxygen evolution. The results suggest that this cation-exchange process should have great potential in the rational design of defect-enriched catalysts toward high-performance electrocatalysis.

Publication Date


  • 2018

Citation


  • Zhou, Q., Chen, Y., Zhao, G., Lin, Y., Yu, Z., Xu, X., Wang, X., Liu, H. Kun., Sun, W. & Dou, S. Xue. (2018). Active-Site-Enriched Iron-Doped Nickel/Cobalt Hydroxide Nanosheets for Enhanced Oxygen Evolution Reaction. ACS Catalysis, 8 5382-5390.

Scopus Eid


  • 2-s2.0-85046665467

Ro Full-text Url


  • https://ro.uow.edu.au/cgi/viewcontent.cgi?article=4671&context=aiimpapers

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/3617

Has Global Citation Frequency


Number Of Pages


  • 8

Start Page


  • 5382

End Page


  • 5390

Volume


  • 8

Place Of Publication


  • United States

Abstract


  • Highly active, durable, and inexpensive nanostructured catalysts are crucial for achieving efficient and economical electrochemical water splitting. However, developing efficient approaches to further improve the catalytic ability of the well-defined nanostructured catalysts is still a big challenge. Herein, we report a facile and universal cation-exchange process for synthesizing Fe-doped Ni(OH)2 and Co(OH)2 nanosheets with enriched active sites toward enhanced oxygen evolution reaction (OER). In comparison with typical NiFe layered double hydroxide (LDH) nanosteets prepared by the conventional one-pot method, Fe-doped Ni(OH)2 nanosheets evolving from Ni(OH)2 via an Fe3+/Ni2+ cation-exchange process possess nanoporous surfaces with abundant defects. Accordingly, Fe-doped Ni(OH)2 nanosheets exhibit higher electrochemical active surface area (ECSA) and improved surface wettability in comparison to NiFe LDH nanosheets and deliver significantly enhanced catalytic activity over NiFe LDH. Specifically, a low overpotential of only 245 mV is required to reach a current density of 10 mA cm–2 for Ni0.83Fe0.17(OH)2 nanosheets with a low Tafel slope of 61 mV dec–1, which is greatly decreased in comparison with those of NiFe LDH (310 mV and 78 mV dec–1). Additionally, this cation-exchange process is successfully extended to prepare Fe-doped Co(OH)2 nanosheets with improved catalytic activity for oxygen evolution. The results suggest that this cation-exchange process should have great potential in the rational design of defect-enriched catalysts toward high-performance electrocatalysis.

Publication Date


  • 2018

Citation


  • Zhou, Q., Chen, Y., Zhao, G., Lin, Y., Yu, Z., Xu, X., Wang, X., Liu, H. Kun., Sun, W. & Dou, S. Xue. (2018). Active-Site-Enriched Iron-Doped Nickel/Cobalt Hydroxide Nanosheets for Enhanced Oxygen Evolution Reaction. ACS Catalysis, 8 5382-5390.

Scopus Eid


  • 2-s2.0-85046665467

Ro Full-text Url


  • https://ro.uow.edu.au/cgi/viewcontent.cgi?article=4671&context=aiimpapers

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/3617

Has Global Citation Frequency


Number Of Pages


  • 8

Start Page


  • 5382

End Page


  • 5390

Volume


  • 8

Place Of Publication


  • United States