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Carbonized Polydopamine-Based Nanocomposites: The Effect of Transition Metals on the Oxygen Electrocatalytic Activity.
| Content Provider | Europe PMC |
|---|---|
| Author | Cebollada, Jesús Sebastián, David Lázaro, María Jesús Martínez-Huerta, Maria Victoria |
| Editor | Mamontov, Grigory V. Gordeeva, Larisa G. Cortes Corberan, Vicente |
| Copyright Year | 2023 |
| Abstract | The electrochemical oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are the most critical processes in renewable energy-related technologies, such as fuel cells, water electrolyzers, and unitized regenerative fuel cells. N-doped carbon composites have been demonstrated to be promising ORR/OER catalyst candidates because of their excellent electrical properties, tunable pore structure, and environmental compatibility. In this study, we prepared porous N-doped carbon nanocomposites (NC) by combining mussel-inspired polydopamine (PDA) chemistry and transition metals using a solvothermal carbonization strategy. The complexation between dopamine catechol groups and transition metal ions (Fe, Ni, Co, Zn, Mn, Cu, and Ti) results in hybrid structures with embedded metal nanoparticles converted to metal–NC composites after the carbonization process. The influence of the transition metals on the structural, morphological, and electrochemical properties was analyzed in detail. Among them, Cu, Co, Mn, and Fe N-doped carbon nanocomposites exhibit efficient catalytic activity and excellent stability toward ORR. This method improves the homogeneous distribution of the catalytically active sites. The metal nanoparticles in reduced (MnO, Fe3C) or metallic (Cu, Co) oxidation states are protected by the N-doped carbon layers, thus further enhancing the ORR performance of the composites. Still, only Co nanocomposite is also effective toward OER with a potential bifunctional gap (ΔE) of 0.867 V. The formation of Co-N active sites during the carbonization process, and the strong coupling between Co nanoparticles and the N-doped carbon layer could promote the formation of defects and the interfacial electron transfer between the catalyst surface, and the reaction intermediates, increasing the bifunctional ORR/OER performance. |
| Journal | Nanomaterials (Basel, Switzerland) |
| Volume Number | 13 |
| PubMed Central reference number | PMC10180844 |
| Issue Number | 9 |
| PubMed reference number | 37177094 |
| e-ISSN | 20794991 |
| DOI | 10.3390/nano13091549 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2023-05-05 |
| Access Restriction | Open |
| Rights License | Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). © 2023 by the authors. |
| Subject Keyword | nitrogen-doped carbon oxygen reduction reaction oxygen evolution reaction bifunctional catalyst polydopamine noble metal-free |
| Content Type | Text |
| Resource Type | Article |
| Subject | Chemical Engineering Materials Science |
