Carbon core–shell Pt nanoparticle embedded porphyrin Co-MOF derived N-doped porous carbon for the alkaline AEM water electrolyzer application

Subramaniam, Mohan Raj; Ramakrishnan, Shanmugam; Sidra, Saleem; Karthikeyan, S. C.; Vijayapradeep, Subramanian; Huang, Jian; Mamlouk, Mohamed; Kim, Do Hwan; Yoo, Dong Jin

doi:10.1039/d3ta06745a

Cited by 7 publications

(2 citation statements)

References 78 publications

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“…Among many catalytic materials, metal–organic frameworks (MOFs) have been recognized as potential electrocatalysts owing to their periodic porous skeletons, uniformly dispersed metal active centers, and adjustable structures. − Unfortunately, the low electrical conductivity hinders its further application in electrocatalysis. Recently, considerable efforts have been made to develop strategies to improve the electrocatalytic performance and understand the structure–activity relationship of MOFs, such as noble metal loading onto MOFs, , defect engineering, , sulfurization, , heterostructures, , and theoretical calculation. − However, these strategies are difficult to control and time-consuming.…”

Section: Introductionmentioning

confidence: 99%

Shifting the Oxygen-Evolution Reaction Pathway via Cation Engineering to Activate Lattice Oxygen in Metal–Organic Frameworks

Zhao,

Zhong,

Fang

et al. 2024

ACS Appl. Mater. Interfaces

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Metal–organic frameworks (MOFs) as promising electrocatalysts have been widely studied, but their performance is limited by conductivity and coordinating saturation. This study proposes a cationic (V) modification strategy and evaluates its effect on the electrocatalytic performance of CoFe–MOF nanosheet arrays. The optimal V–CoFe–MOF/NF electrocatalyst exhibits excellent oxygen-evolution reaction (OER)/hydrogen-evolution reaction (HER) performance (231 mV at 100 mA cm–2/86 mV at 10 mA cm–2) in alkaline conditions, with its OER durability exceeding 400 h without evident degradation. Furthermore, as a bifunctional electrocatalyst for water splitting, a small cell voltage is achieved (1.60 V at 10 mA cm–2). The practicability of the catalyst is further evaluated by membrane electrode assembly (MEA), showing outstanding activity (1.53 V at 10 mA cm–2) and long-term stability (at 300 mA cm–2). Moreover, our results reveal the apparent reconstruction properties of V–CoFe–MOF/NF in alkaline electrolytes, where the partially dissolved V promotes the formation of more active β-MOOH. The mechanism study shows the OER mechanism shifts to a lattice oxygen oxidation mechanism (LOM) after V doping, which directly avoids complex multistep adsorption mechanism and reduces reaction energy. This study provides a cation mediated strategy for designing efficient electrocatalysts.

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Section: Introductionmentioning

confidence: 99%

Shifting the Oxygen-Evolution Reaction Pathway via Cation Engineering to Activate Lattice Oxygen in Metal–Organic Frameworks

Zhao,

Zhong,

Fang

et al. 2024

ACS Appl. Mater. Interfaces

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show abstract

“…Metal-organic frameworks (MOFs) represent an emerging class of materials, which possess a stable porous architecture by linking metal atoms with organic ligands via covalent bonds and other interactions [19]. Distinct from traditional materials, MOFs captivate attention due to their low density, extensive specific surface area, and wealth of metal active centers [20].…”

Section: Introductionmentioning

confidence: 99%

Shape–Preserved CoFeNi–MOF/NF Exhibiting Superior Performance for Overall Water Splitting across Alkaline and Neutral Conditions

Liu,

Li,

Wang

et al. 2024

Materials

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This study reported a multi–functional Co0.45Fe0.45Ni0.9–MOF/NF catalyst for oxygen evolution reaction (OER), hydrogen evolution reaction (HER), and overall water splitting, which was synthesized via a novel shape–preserving two–step hydrothermal method. The resulting bowknot flake structure on NF enhanced the exposure of active sites, fostering a superior electrocatalytic surface, and the synergistic effect between Co, Fe, and Ni enhanced the catalytic activity of the active site. In an alkaline environment, the catalyst exhibited impressive overpotentials of 244 mV and 287 mV at current densities of 50 mA cm−2 and 100 mA cm−2, respectively. Transitioning to a neutral environment, an overpotential of 505 mV at a current density of 10 mA cm−2 was achieved with the same catalyst, showing a superior property compared to similar catalysts. Furthermore, it was demonstrated that Co0.45Fe0.45Ni0.9–MOF/NF shows versatility as a bifunctional catalyst, excelling in both OER and HER, as well as overall water splitting. The innovative shape–preserving synthesis method presented in this study offers a facile method to develop an efficient electrocatalyst for OER under both alkaline and neutral conditions, which makes it a promising catalyst for hydrogen production by water splitting.

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Atomic Engineering of 3D Self‐Supported Bifunctional Oxygen Electrodes for Rechargeable Zinc‐Air Batteries and Fuel Cell Applications

Poudel,

Balanay,

Lohani

et al. 2024

Advanced Energy Materials

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The oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) are cornerstone half reactions involved in many renewable energy technologies. High‐density single‐atom catalysts maximize the atom utilization and isolated active sites. Furthermore, introduction of pyri‐N into the carbon‐based nanostructures as an oxygen electrocatalyst creates an abundance of active sites. Here, an innovative strategy is reported based on atomic scale dispersion of Co atoms into the pyri‐N enriched carbon nanotube encapsulated Ni nanoparticles grown on 3D electrospun carbon nanofiber nano‐assemblies. Notably, the CoSANi‐NCNT/CNF electrocatalyst exhibited excellent OER and ORR activity in terms of low overpotentials and higher half‐wave potentials. The atomically distributed Co allows the maximum exposure of active sites on the pyri‐N dominated multidimensional carbon skeleton, and synergistic effects with Ni nanoparticles greatly reduced the delocalization around the metal centers and provided an ideal environment for interactions with oxygen intermediates, thus facilitating the 4e− pathway, as evidenced by the DFT calculations. Moreover, Zn‐air batteries using a CoSANi‐NCNT/CNF air cathode exhibited a high‐power density and admirable specific capacity. This studies may provide an avenue for the rational modulation of single‐atom catalysts and cost‐effective, large‐scale synthesis of bifunctional oxygen electrocatalysts for rechargeable Zn‐air batteries and anion exchange membrane fuel cell.

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Carbon core–shell Pt nanoparticle embedded porphyrin Co-MOF derived N-doped porous carbon for the alkaline AEM water electrolyzer application

Abstract: Industrial clean hydrogen (H2) production using efficient and durable electrocatalysts is an essential goal for developing future renewable energy systems. Herein, we report the synthesis of carbon core-shell platinum (Pt)...

Cited by 7 publications

References 78 publications

Shifting the Oxygen-Evolution Reaction Pathway via Cation Engineering to Activate Lattice Oxygen in Metal–Organic Frameworks

Shifting the Oxygen-Evolution Reaction Pathway via Cation Engineering to Activate Lattice Oxygen in Metal–Organic Frameworks

Shape–Preserved CoFeNi–MOF/NF Exhibiting Superior Performance for Overall Water Splitting across Alkaline and Neutral Conditions

Atomic Engineering of 3D Self‐Supported Bifunctional Oxygen Electrodes for Rechargeable Zinc‐Air Batteries and Fuel Cell Applications

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