Facile synthesis of novel carbon dots@metal organic framework composite for remarkable and highly sustained oxygen evolution reaction

Rehman, Muhammad Yousaf ur; Manzoor, Sumaira; Nazar, Nosheen; Abid, Abdul Ghafoor; Qureshi, Ashfaq Mahmood; Chughtai, Adeel Hussain; Joya, Khurram Saleem; Shah, Afzal; Ashiq, Muhammad Naeem

doi:10.1016/j.jallcom.2020.158038

Cited by 47 publications

(25 citation statements)

References 66 publications

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“…In this case, the value of C dl can be obtained by plotting the slope against the change in current density vs scan rate (Figure d,f). Furthermore, the ECSA value can be calculated by dividing double-layer capacitance by the specific capacitance (0.04 mF/cm 2 ) as already reported . The calculated ECSA values for Sm 2 O 3 /GP, Fe 2 O 3 /GP, and Sm 2 O 3 /Fe 2 O 3 /GP were 0.787, 0.75, and 2.97 cm 2 , respectively.…”

Section: Resultsmentioning

confidence: 73%

“…Furthermore, the ECSA value can be calculated by dividing double-layer capacitance by the specific capacitance (0.04 mF/ cm 2 ) as already reported. 26 The calculated ECSA values for Sm 2 O 3 /GP, Fe 2 O 3 /GP, and Sm 2 O 3 /Fe 2 O 3 /GP were 0.787, 0.75, and 2.97 cm 2 , respectively. The larger value of ECSA for Sm 2 O 3 /Fe 2 O 3 /GP suggests numerous active sites due to the porous nature with oxygen-defective gyroid morphology.…”

Section: Electrochemical Studiesmentioning

confidence: 86%

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Scalable Synthesis of Sm₂O₃/Fe₂O₃ Hierarchical Oxygen Vacancy-Based Gyroid-Inspired Morphology: With Enhanced Electrocatalytic Activity for Oxygen Evolution Performance

et al. 2021

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Non-platinum-based critically and rationally fabricated electrocatalysts show promising efficiency in electrochemical oxygen evolution reaction (OER) due to their reliability and costeffectiveness. Herein, a hydrothermally designed oxygen-defective Sm 2 O 3 /Fe 2 O 3 composite with gyroid morphology provides superior active sites with high porosity and mass charge transport in a catalytic system. All of the fabricated materials were characterized via different analytical techniques. The Sm 2 O 3 / Fe 2 O 3 hierarchical composite displays an outstanding lower overpotential (272 mV) to attain a current density of 10 mA/ cm 2 and a lower Tafel slope (75 mV/dec) compared to the individual materials Sm 2 O 3 and Fe 2 O 3 in alkaline media. The remarkable electrocatalytic intrinsic OER performance of oxygendefective Sm 2 O 3 /Fe 2 O 3 is ascribed to the strong synergistic effect among both materials due to their unique gyroid structure, and such architecture exhibits extraordinary electrical properties due to its porous structure. Hierarchical Sm 2 O 3 /Fe 2 O 3 exhibits marvelous activity and stability at an applied potential (0.7 V) with a slight decrease in current density. All of the extraordinary results acquired from electrochemical activity make Sm 2 O 3 /Fe 2 O 3 a promising electrocatalyst for electrochemical energy generation.

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Section: Resultsmentioning

confidence: 73%

Section: Electrochemical Studiesmentioning

confidence: 86%

Scalable Synthesis of Sm₂O₃/Fe₂O₃ Hierarchical Oxygen Vacancy-Based Gyroid-Inspired Morphology: With Enhanced Electrocatalytic Activity for Oxygen Evolution Performance

et al. 2021

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“…To remove this misunderstanding, the overpotential was calculated by reverse scan (Figure S3, Supporting Information). The oxidation of Ni is the initial step of sluggish OER, which is the rate-determination step of overall water splitting …”

Section: Resultsmentioning

confidence: 99%

Template-Free Hydrothermal Growth of Nickel Sulfide Nanorods as High-Performance Electroactive Materials for Oxygen Evolution Reaction and Supercapacitors

et al. 2021

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Transition-metal sulfides with nanostructured features grown on a conductive substrate have been suggested as a promising alternative to precious metal-based electrocatalysts for energy conversion and storage. Here, we configure the facile and single-step growth of nickel sulfide nanorods on Ni mesh (NiS/Ni) via a template-free hydrothermal approach for the oxygen evolution reaction (OER) and supercapacitor applications. The surface morphology of NiS was strongly affected by changing the concentration of Ni and S precursors. X-ray photoelectron spectroscopy (XPS) and energy-dispersive X-ray spectroscopy (EDX) revealed the presence of NiS in the samples. Under optimized conditions, the NiS/Ni electrode displayed superior OER performance, demanding 330 mV overpotential to oxidize water at a current density of 10 mA cm–2 in 1.0 M KOH, with a Tafel slope of 67 mV dec–1. The material also demonstrated excellent charge storage capabilities, including specific capacitances of 1097 and 869 F g–1 at current densities of 2 and 20 mA cm–2, respectively. Moreover, the fabricated NiS/Ni exhibited appreciable energy and power densities (484 W h kg–1; 0.79 W kg–1). The superior OER performance and energy storage properties can be attributed to the large electrode/electrolyte interfacial area of the NiS/Ni electrode owing to the desirable nanorod-like surface morphology. This study thus presents a simple synthesis route for the preparation of highly active NiS/Ni as a potential electrode material for electrochemical energy conversion and storage devices.

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“…[54] The CDs@MOFs composite catalysts provide a new idea for the development of new electrocatalysts. Rehman and coworkers [55] reported a novel CDs@MOFs (Ni) electrocatalyst containing two ligands, 1, 3, 5-benzenetricarboxylic acid (BTC) and 4, 4-bipyridine (bpy) (Figure 5b). CDs@MOFs composite catalysts not only exhibits ultra-high stability in 1000 CV cycles of cyclic voltammetric scans and over a long period of 40 h operation, but also exhibits the same starting voltage as other MOF-based electrocatalysts (1.50 V vs. RHE) and overpotential (1.55 V (320 mV) vs. RHE).…”

Section: Application Of Cds@mofs Materials For Electrocatalysismentioning

confidence: 99%

“…Therefore, CDs@MOFs can be used as a potential excellent electrocatalyst for water electrolysis to obtain hydrogen energy. [55]…”

Section: Application Of Cds@mofs Materials For Electrocatalysismentioning

confidence: 99%

Recent Advances in the Application and Mechanism of Carbon Dots/Metal‐Organic Frameworks Hybrids in Photocatalysis and the Detection of Environmental Pollutants

Jiang

Xie

et al. 2022

Chemistry An Asian Journal

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Metal-organic frameworks (MOFs) are a class of crystalline porous materials with simple synthesis conditions, large specific surface area, structural diversity, and a wide range of interesting properties. The integration of MOFs with other materials can provide new multifunctional composites that exhibit both component properties and new characteristics. In recent years, the integration of carbon dots (CDs) into MOFs to form composites has shown improved optical properties and fascinating new characteristics. This review focuses on the design and synthesis strategies of CDs@MOFs composites (including pore-confined synthesis, in situ encapsulation, post-synthesis modification and impregnation method) and their recent research progress in photocatalysis and detection of environmental pollutants. Both the achievements and problems are evaluated and proposed, and the opportunities and challenges of CDs@MOF composite are discussed.

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Facile synthesis of novel carbon dots@metal organic framework composite for remarkable and highly sustained oxygen evolution reaction

Cited by 47 publications

References 66 publications

Scalable Synthesis of Sm₂O₃/Fe₂O₃ Hierarchical Oxygen Vacancy-Based Gyroid-Inspired Morphology: With Enhanced Electrocatalytic Activity for Oxygen Evolution Performance

Scalable Synthesis of Sm₂O₃/Fe₂O₃ Hierarchical Oxygen Vacancy-Based Gyroid-Inspired Morphology: With Enhanced Electrocatalytic Activity for Oxygen Evolution Performance

Template-Free Hydrothermal Growth of Nickel Sulfide Nanorods as High-Performance Electroactive Materials for Oxygen Evolution Reaction and Supercapacitors

Recent Advances in the Application and Mechanism of Carbon Dots/Metal‐Organic Frameworks Hybrids in Photocatalysis and the Detection of Environmental Pollutants

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Facile synthesis of novel carbon dots@metal organic framework composite for remarkable and highly sustained oxygen evolution reaction

Cited by 47 publications

References 66 publications

Scalable Synthesis of Sm2O3/Fe2O3 Hierarchical Oxygen Vacancy-Based Gyroid-Inspired Morphology: With Enhanced Electrocatalytic Activity for Oxygen Evolution Performance

Scalable Synthesis of Sm2O3/Fe2O3 Hierarchical Oxygen Vacancy-Based Gyroid-Inspired Morphology: With Enhanced Electrocatalytic Activity for Oxygen Evolution Performance

Template-Free Hydrothermal Growth of Nickel Sulfide Nanorods as High-Performance Electroactive Materials for Oxygen Evolution Reaction and Supercapacitors

Recent Advances in the Application and Mechanism of Carbon Dots/Metal‐Organic Frameworks Hybrids in Photocatalysis and the Detection of Environmental Pollutants

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Scalable Synthesis of Sm₂O₃/Fe₂O₃ Hierarchical Oxygen Vacancy-Based Gyroid-Inspired Morphology: With Enhanced Electrocatalytic Activity for Oxygen Evolution Performance

Scalable Synthesis of Sm₂O₃/Fe₂O₃ Hierarchical Oxygen Vacancy-Based Gyroid-Inspired Morphology: With Enhanced Electrocatalytic Activity for Oxygen Evolution Performance