Cu–Fe–NH<sub>2</sub> based metal–organic framework nanosheets <i>via</i> drop-casting for highly efficient oxygen evolution catalysts durable at ultrahigh currents

Shrestha, Nabeen K.; Patil, Supriya A.; Cho, Sangeun; Jo, Young‐Heon; Kim, Hyungsang; Im, Hyunsik

doi:10.1039/d0ta07716j

Cited by 104 publications

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Section: D Mof Nanosheetsmentioning

confidence: 99%

“…By utilizing nickel foam substrates as a support, Shrestha et al prepared thin Cu-Fe-NH 2 MOF nanosheets (Figure 4f). [68] Both dropping bulk MOFs ink on the surface of the support or directly immersing the support in the ink could produce uniformly deposited MOF nanosheets with an average size of 390 nm. In another precedent, the in-situ deposition of MOF-74(Cu) nanosheets onto the carbon cloth surface was realized via the template-assisted synthetic approach.…”

Section: D Mof Nanosheetsmentioning

confidence: 99%

mentioning

confidence: 99%

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Applications of Metal‐Organic Frameworks in Water Treatment: A Review

Yang

Kai-liang

et al. 2021

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ions, synthetic dyes, antibiotics, and other substances in groundwater and wastewater discharged from factories have caused serious harm to the environment and human health. Therefore, it is vital to develop efficient water pollution treatment methods.The heavy metal ions discharged from factories into rivers and lakes can cause diffusion and pollution. Highly toxic heavy metal ions are easy to accumulate in organisms because they are not biodegradable. [1] Organic dyes and radioactive pollutants produced in industrial production will diffuse into soil and water resources, endangering the safety of animals, plants and human life. [2] The leakage of antibiotics in the fields of biology and medicine will destroy the balance and stability of the ecosystem. [3] An enormous number of pollutants are persistent and difficult to degrade. Scientists have been committed to developing various technologies and materials for removing pollutants from water environment. Nevertheless, effectively purifying sewage still remains a tough challenge.Various techniques are used for sewage purification to remove pollutants in the environment. Common methods include separation, [4] absorption, [5] photocatalytic degradation, [6] and membrane filtration. [7] However, traditional absorbents and catalysts such as zeolites, activated carbons, organic resins, etc. have poor pollutant removal capabilities. [8] Traditional adsorbents, such as carbons and clay minerals, exhibit weak ionic affinity and low adsorption efficiency for metals. [9] Furthermore, partial catalysts possess inferior charge separation efficiency, recyclability, and chemical stability, which is likely to cause secondary pollution to water sources, and does not meet the requirements of green, energy saving, and renewable in the field of modern environment protection. [10] Therefore, researchers have been trying to exploit an efficient and economical composite material with superb specific surface area, high separation and strong reusability. [11] Metal-organic framework (MOF) is a new type of composite material self-assembled by metal ions or metal clusters and organic linkers. [12] As a novel type porous material, MOF has adjustable pore size, superior specific surface area and excellent porosity, and its performance is more superiority than traditional materials such as zeolite and clay. [13] They have raisedThe ever-expanding scale of industry and agriculture has led to the gradual increase of pollutants (e.g., heavy metal ions, synthetic dyes, and antibiotics) in water resources, and the ecology and wastewater are grave problems that need to be solved urgently and has attracted widespread attention from the research community and industry in recent years. Metal-organic frameworks (MOFs) are a type of organic-inorganic hybrid material with a distinctive 3D network crystal structure. Lately, MOFs have made striking progress in the fields of adsorption, catalytic degradation, and biomedicine on account of their large specific surface and well-developed pore structure. This...

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Section: D Mof Nanosheetsmentioning

confidence: 99%

Section: D Mof Nanosheetsmentioning

confidence: 99%

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Applications of Metal‐Organic Frameworks in Water Treatment: A Review

Yang

Kai-liang

et al. 2021

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“…Great efforts have been made to search for noble-metal-free catalysts with high activity and durability. To date, transition metal dichalcogenides (TMDs) [ 6 ], metal phosphides [ 7 ], MXenes [ 8 ] and MOFs [ 9 , 10 ] have been explored as suitable alternatives of Pt for the hydrogen evolution reaction (HER). For example, non-noble metal-based compounds such as MoS 2 , WS 2 , CoS 2 , NiSe 2 , CoSe 2 [ 11 ], amorphous MoSx, VS 2 , CoP, Ni 2 P, FeP, WP, MoP|S, CoPS, NiP 1.93 Se 0.07 , and NiMo alloys have been studied as potential HER electrocatalysts [ 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

A Facile Design of Solution-Phase Based VS2 Multifunctional Electrode for Green Energy Harvesting and Storage

et al. 2022

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This work reports the fabrication of vanadium sulfide (VS2) microflower via one-step solvo-/hydro-thermal process. The impact of ethylene glycol on the VS2 morphology and crystal structure as well as the ensuing influences on electrocatalytic hydrogen evolution reaction (HER) and supercapacitor performance are explored and compared with those of the VS2 obtained from the standard pure-aqueous and pure-ethylene glycol solvents. The optimized VS2 obtained from the ethylene glycol and water mixed solvents exhibits a highly ordered unique assembly of petals resulting a highly open microflower structure. The electrode based on the optimized VS2 exhibits a promising HER electrocatalysis in 0.5 M H2SO4 and 1 M KOH electrolytes, attaining a low overpotential of 161 and 197 mV, respectively, at 10 mA.cm−2 with a small Tafel slope 83 and 139 mVdec−1. In addition, the optimized VS2 based electrode exhibits an excellent electrochemical durability over 13 h. Furthermore, the superior VS2 electrode based symmetric supercapacitor delivers a specific capacitance of 139 Fg−1 at a discharging current density of 0.7 Ag−1 and exhibits an enhanced energy density of 15.63 Whkg−1 at a power density 0.304 kWkg−1. Notably, the device exhibits the capacity retention of 86.8% after 7000 charge/discharge cycles, demonstrating a high stability of the VS2 electrode.

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“…Hydrogen is a very important candidate for replacing non‐renewable fossil fuels due to its outstanding properties such as high energy density, zero carbon emission, good recyclability, and high conversion efficiency 2,3 . It can be produced using environmentally friendly electrochemical water splitting or electrocatalysis consisting of two electrochemical processes 4‐7 : the anodic oxygen evolution reaction (OER) and the cathodic hydrogen evolution reaction (HER). Water electrolysis is the process by which the strong covalent bond between oxygen and hydrogen in H 2 O is broken, thereby producing oxygen and hydrogen molecules.…”

Section: Introductionmentioning

confidence: 99%

Nonprecious bimetallic NiFe ‐layered hydroxide nanosheets as a catalyst for highly efficient electrochemical water splitting

Chavan

et al. 2021

Int J Energy Res

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Summary It has become highly necessary to advance stable, cost‐effective, and energy‐efficient hydrogen production using non‐precious metal‐based water electrolysis to replace the increasing demand for fossil fuels and maintain environmental safety. Herein, we present the synthesis of non‐precious bimetallic Ni1‐xFex‐layered hydroxide nanosheet films by using a chemical‐bath deposition technique for use as oxygen evolution reaction (OER) catalysts for electrochemical water electrolysis. Remarkably, the optimized Ni0.50Fe0.50‐layered hydroxide electrode exhibited excellent OER activity in 1 M potassium hydroxide electrolyte while having a low overpotential of 239.7 mV at a current density of 10 mA cm−2 with a small Tafel slope of 38.02 mV dec−1. It was electrochemically stable over 100 hours of continuous OER operation, thereby showing its excellent electrochemical stability. The results from a post‐OER study reveal that catalytically active OER sites are associated with the formation of a nickel oxyhydroxide intermediate on the surface of the electrode. The maximum synergy among good electronic conductivity, high diffusion coefficient, and enlarged electrochemically active sites was obtained by optimizing the Ni/Fe ratio and thereby, the OER activity.

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Cu–Fe–NH₂ based metal–organic framework nanosheets via drop-casting for highly efficient oxygen evolution catalysts durable at ultrahigh currents

Abstract: A scalable and economical drop-cast aided approach for the synthesis of a self-supportive thin-film of Cu–Fe–NH2 based MOF nanosheets as a highly efficient and durable electrocatalyst for water-splitting at high currents.

Cited by 104 publications

References 56 publications

Applications of Metal‐Organic Frameworks in Water Treatment: A Review

Applications of Metal‐Organic Frameworks in Water Treatment: A Review

A Facile Design of Solution-Phase Based VS2 Multifunctional Electrode for Green Energy Harvesting and Storage

Nonprecious bimetallic NiFe ‐layered hydroxide nanosheets as a catalyst for highly efficient electrochemical water splitting

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Cu–Fe–NH2 based metal–organic framework nanosheets via drop-casting for highly efficient oxygen evolution catalysts durable at ultrahigh currents

Abstract: A scalable and economical drop-cast aided approach for the synthesis of a self-supportive thin-film of Cu–Fe–NH2 based MOF nanosheets as a highly efficient and durable electrocatalyst for water-splitting at high currents.

Cited by 104 publications

References 56 publications

Applications of Metal‐Organic Frameworks in Water Treatment: A Review

Applications of Metal‐Organic Frameworks in Water Treatment: A Review

A Facile Design of Solution-Phase Based VS2 Multifunctional Electrode for Green Energy Harvesting and Storage

Nonprecious bimetallic NiFe ‐layered hydroxide nanosheets as a catalyst for highly efficient electrochemical water splitting

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Product

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Cu–Fe–NH₂ based metal–organic framework nanosheets via drop-casting for highly efficient oxygen evolution catalysts durable at ultrahigh currents