Introducing oxygen vacancies to NiFe LDH through electrochemical reduction to promote the oxygen evolution reaction

Hou, Xiaoman; Li, Jing; Zheng, Jian; Li, Luming; Chu, Wei

doi:10.1039/d2dt00749e

Cited by 23 publications

(10 citation statements)

References 67 publications

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“… [40,42] The HR‐XPS spectrum of O 1s could be deconvolved into four peaks: at 533.5, 532.0, 530.8 and 530.0 eV, ascribed to adsorbed H 2 O, oxygen vacancies (OVs), −OH and Co−O, respectively (Figure S5) [43] . The OVs could endow the catalyst surface with hydrophilicity thus boosting the electrochemical performances [38,44] . All the XPS results were consistent with the XRD and TEM analysis, indicating the successful fabrication of Co‐NP/MNCF.…”

Section: Resultssupporting

confidence: 75%

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Co Nanoparticles Confined in Mesoporous Mo/N Co‐Doped Polyhedral Carbon Frameworks towards High‐Efficiency Oxygen Reduction

Wang

Gao

Wei

et al. 2023

Chemistry A European J

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Exploiting effective non-noble metal electrocatalysts for oxygen reduction reaction (ORR) is crucial for fuel cells and metal-air batteries. Herein, we designed and fabricated Co nanoparticles confined in Mo/N co-doped polyhedral carbon frameworks (Co-NP/MNCF) derived from polyoxometalate-encapsuled metal-organic framework, which showed comparable ORR performance with commercial Pt/C and a larger diffusion-limited current density. Moreover, the Co-NP/ MNCF also exhibited excellent ORR stability and methanol tolerance. These appealing performances can be attributed to the porosity regulation and heteroatom doping of metalorganic framework derived polyhedral carbon frameworks, which could be beneficial for the exposure of more active sites, the optimization of electronic structure and the mass transfer of electrolyte/electron/ion.

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Section: Resultssupporting

confidence: 75%

“…[43] The OVs could endow the catalyst surface with hydrophilicity thus boosting the electrochemical performances. [38,44] All the XPS results were consistent with the XRD and TEM analysis, indicating the successful fabrication of Co-NP/MNCF. 3a, implying favorable responses to ORR.…”

Section: Chemistry-a European Journalsupporting

confidence: 72%

Co Nanoparticles Confined in Mesoporous Mo/N Co‐Doped Polyhedral Carbon Frameworks towards High‐Efficiency Oxygen Reduction

Wang

Gao

Wei

et al. 2023

Chemistry A European J

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“…[75] The OVs and Co 2 + could serve as the adsorption sites of H 2 O and oxygen ion, thereby improving the OER performance. [76] All the XPS results are consistent with XRD and TEM analysis, demonstrating the successful fabrication of PW-NiCo-NC.…”

Section: Chemcatchemsupporting

confidence: 77%

“…The synergistic effect between cobalt oxide (CoO x ) and Co nanoparticles could make noteworthy contributions to the electrochemical performance [75] . The OVs and Co 2+ could serve as the adsorption sites of H 2 O and oxygen ion, thereby improving the OER performance [76] . All the XPS results are consistent with XRD and TEM analysis, demonstrating the successful fabrication of PW‐NiCo‐NC.…”

Section: Resultssupporting

confidence: 57%

Hollow Carbon Cages Derived from Polyoxometalate‐Encapsuled Metal‐Organic Frameworks for Energy‐Saving Hydrogen Production

et al. 2023

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The electrocatalytic conversion of water‐to‐hydrogen powered by renewable energy is one of the promising strategies to unravel the energy and environment crises. However, a such process usually costs large energy consumption owing to the low efficiency of anodic oxygen evolution reaction (OER), which is another vital half reaction of the overall water splitting (OWS) system. Herein, we designed and fabricated hollow nitrogen‐doped carbon nanocages loaded with Ni3N and Co nanoparticles derived from polyoxometalate‐encapsuled metal‐organic frameworks. The catalyst exhibited appealing dual functions for both OER and hydrogen evolution reaction (HER), outperforming the Ni‐free and solid samples. Notably, the designed catalyst also showed much enhanced electrochemical performance for glycerol/glucose oxidation reaction when compared with OER. The home‐made two‐electrode electrolyzer, coupled HER with polyalcohol or glucose oxidation reaction, only needs cell voltages of 1.125 and 1.557 V to reach 10 mA cm−2, respectively, which are much smaller than that in 1 M KOH (2.087 V), demonstrating a large amount of energy saving for hydrogen production.

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“…However, it exhibits sluggish kinetics and needs a large overpotential to drive, since the OER process concerns the formation of oxygen–oxygen bond and contains the complicated four‐electron‐transfer process 5–8 . Considering that, efficient OER electrocatalysts are desirable to facilitate reaction kinetics and reduce overpotential 9–13 . Some noble metal oxides as electrocatalysts, such as Ir and Ru oxides, can significantly promote the OER kinetics, whereas their high price and lack of availability have seriously restricted their large‐scale applications 14–19 .…”

Section: Introductionmentioning

confidence: 99%

Prussian blue analog‐derived bimetallic phosphide nanoparticles anchored in nitrogen‐doped porous electrospun carbon nanofibers for efficient oxygen evolution reaction

Ren,

Yu,

Liu

2023

Applied Organom Chemis

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Prussian blue analogs (PBAs) and their derivatives have been extensively investigated as potential oxygen evolution reaction (OER) electrocatalysts due to their high specific surface areas, adjustable composition, and controllable morphology, yet they suffer from easy aggregation and poor electrical conductivity. Herein, we successfully synthesized PBA‐derived NiFe bimetallic phosphide nanoparticles encapsulated in porous nitrogen‐doped electrospun carbon nanofibers by sequential electrospinning, carbonization, and phosphorization. By exploring the effects of different phosphating temperatures on electrocatalytic performance, the obtained electrocatalyst possesses a low overpotential of 262 mV at 10 mA cm−2 for OER in 1.0 M KOH. The electrospun carbon nanofibers can not only address the problem of poor electrical conductivity of PBA derivatives but also provide confinement effect, which could reduce PBA aggregation and collapse. Furthermore, the coupling effect of porous nitrogen‐doped electrospun carbon nanofibers and PBA‐derived bimetallic phosphide nanoparticles facilitates sufficient exposure of active species, expedites electron transfer, accelerates reaction kinetics, and improves durability.

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Introducing oxygen vacancies to NiFe LDH through electrochemical reduction to promote the oxygen evolution reaction

Abstract: The transition metal hydroxide NiFe LDH is a promising oxygen evolution reaction (OER) catalyst. Surface engineering, such as the introduction of oxygen vacancies into NiFe LDH, has been reported to...

Cited by 23 publications

References 67 publications

Co Nanoparticles Confined in Mesoporous Mo/N Co‐Doped Polyhedral Carbon Frameworks towards High‐Efficiency Oxygen Reduction

Co Nanoparticles Confined in Mesoporous Mo/N Co‐Doped Polyhedral Carbon Frameworks towards High‐Efficiency Oxygen Reduction

Hollow Carbon Cages Derived from Polyoxometalate‐Encapsuled Metal‐Organic Frameworks for Energy‐Saving Hydrogen Production

Prussian blue analog‐derived bimetallic phosphide nanoparticles anchored in nitrogen‐doped porous electrospun carbon nanofibers for efficient oxygen evolution reaction

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