Nanostructure Engineering of Metal–Organic Derived Frameworks: Cobalt Phosphide Embedded in Carbon Nanotubes as an Efficient ORR Catalyst

Heteroatom doping is considered an efficient strategy when tuning the electronic and structural modulation of catalysts to achieve improved performance towards renewable energy applications. Herein, we synthesized a series of carbon-based hierarchical nanostructures through the controlled pyrolysis...

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Autores principales:	Syed Shoaib Ahmad Shah, Tayyaba Najam, Costas Molochas, Muhammad Altaf Nazir, Angeliki Brouzgou, Muhammad Sufyan Javed, Aziz ur Rehman, Panagiotis Tsiakaras
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	MOFs nanostructure engineering heteroatom doping cobalt phosphide oxygen reduction reaction Organic chemistry QD241-441
Acceso en línea:	https://doaj.org/article/1739b908889a47888ea51808c6aaac91
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spelling	oai:doaj.org-article:1739b908889a47888ea51808c6aaac912021-11-11T18:37:59ZNanostructure Engineering of Metal–Organic Derived Frameworks: Cobalt Phosphide Embedded in Carbon Nanotubes as an Efficient ORR Catalyst10.3390/molecules262166721420-3049https://doaj.org/article/1739b908889a47888ea51808c6aaac912021-11-01T00:00:00Zhttps://www.mdpi.com/1420-3049/26/21/6672https://doaj.org/toc/1420-3049Heteroatom doping is considered an efficient strategy when tuning the electronic and structural modulation of catalysts to achieve improved performance towards renewable energy applications. Herein, we synthesized a series of carbon-based hierarchical nanostructures through the controlled pyrolysis of Co-MOF (metal organic framework) precursors followed by in situ phosphidation. Two kinds of catalysts were prepared: metal nanoparticles embedded in carbon nanotubes, and metal nanoparticles dispersed on the carbon surface. The results proved that the metal nanoparticles embedded in carbon nanotubes exhibit enhanced ORR electrocatalytic performance, owed to the enriched catalytic sites and the mass transfer facilitating channels provided by the hierarchical porous structure of the carbon nanotubes. Furthermore, the phosphidation of the metal nanoparticles embedded in carbon nanotubes (P-Co-CNTs) increases the surface area and porosity, resulting in faster electron transfer, greater conductivity, and lower charge transfer resistance towards ORR pathways. The P-Co-CNT catalyst shows a half-wave potential of 0.887 V, a Tafel slope of 67 mV dec<sup>−1</sup>, and robust stability, which are comparatively better than the precious metal catalyst (Pt/C). Conclusively, this study delivers a novel path for designing multiple crystal phases with improved catalytic performance for energy devices.Syed Shoaib Ahmad ShahTayyaba NajamCostas MolochasMuhammad Altaf NazirAngeliki BrouzgouMuhammad Sufyan JavedAziz ur RehmanPanagiotis TsiakarasMDPI AGarticleMOFsnanostructure engineeringheteroatom dopingcobalt phosphideoxygen reduction reactionOrganic chemistryQD241-441ENMolecules, Vol 26, Iss 6672, p 6672 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	MOFs nanostructure engineering heteroatom doping cobalt phosphide oxygen reduction reaction Organic chemistry QD241-441
spellingShingle	MOFs nanostructure engineering heteroatom doping cobalt phosphide oxygen reduction reaction Organic chemistry QD241-441 Syed Shoaib Ahmad Shah Tayyaba Najam Costas Molochas Muhammad Altaf Nazir Angeliki Brouzgou Muhammad Sufyan Javed Aziz ur Rehman Panagiotis Tsiakaras Nanostructure Engineering of Metal–Organic Derived Frameworks: Cobalt Phosphide Embedded in Carbon Nanotubes as an Efficient ORR Catalyst
description	Heteroatom doping is considered an efficient strategy when tuning the electronic and structural modulation of catalysts to achieve improved performance towards renewable energy applications. Herein, we synthesized a series of carbon-based hierarchical nanostructures through the controlled pyrolysis of Co-MOF (metal organic framework) precursors followed by in situ phosphidation. Two kinds of catalysts were prepared: metal nanoparticles embedded in carbon nanotubes, and metal nanoparticles dispersed on the carbon surface. The results proved that the metal nanoparticles embedded in carbon nanotubes exhibit enhanced ORR electrocatalytic performance, owed to the enriched catalytic sites and the mass transfer facilitating channels provided by the hierarchical porous structure of the carbon nanotubes. Furthermore, the phosphidation of the metal nanoparticles embedded in carbon nanotubes (P-Co-CNTs) increases the surface area and porosity, resulting in faster electron transfer, greater conductivity, and lower charge transfer resistance towards ORR pathways. The P-Co-CNT catalyst shows a half-wave potential of 0.887 V, a Tafel slope of 67 mV dec<sup>−1</sup>, and robust stability, which are comparatively better than the precious metal catalyst (Pt/C). Conclusively, this study delivers a novel path for designing multiple crystal phases with improved catalytic performance for energy devices.
format	article
author	Syed Shoaib Ahmad Shah Tayyaba Najam Costas Molochas Muhammad Altaf Nazir Angeliki Brouzgou Muhammad Sufyan Javed Aziz ur Rehman Panagiotis Tsiakaras
author_facet	Syed Shoaib Ahmad Shah Tayyaba Najam Costas Molochas Muhammad Altaf Nazir Angeliki Brouzgou Muhammad Sufyan Javed Aziz ur Rehman Panagiotis Tsiakaras
author_sort	Syed Shoaib Ahmad Shah
title	Nanostructure Engineering of Metal–Organic Derived Frameworks: Cobalt Phosphide Embedded in Carbon Nanotubes as an Efficient ORR Catalyst
title_short	Nanostructure Engineering of Metal–Organic Derived Frameworks: Cobalt Phosphide Embedded in Carbon Nanotubes as an Efficient ORR Catalyst
title_full	Nanostructure Engineering of Metal–Organic Derived Frameworks: Cobalt Phosphide Embedded in Carbon Nanotubes as an Efficient ORR Catalyst
title_fullStr	Nanostructure Engineering of Metal–Organic Derived Frameworks: Cobalt Phosphide Embedded in Carbon Nanotubes as an Efficient ORR Catalyst
title_full_unstemmed	Nanostructure Engineering of Metal–Organic Derived Frameworks: Cobalt Phosphide Embedded in Carbon Nanotubes as an Efficient ORR Catalyst
title_sort	nanostructure engineering of metal–organic derived frameworks: cobalt phosphide embedded in carbon nanotubes as an efficient orr catalyst
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/1739b908889a47888ea51808c6aaac91
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Nanostructure Engineering of Metal–Organic Derived Frameworks: Cobalt Phosphide Embedded in Carbon Nanotubes as an Efficient ORR Catalyst

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