A hierarchically porous and hydrophilic 3D nickel–iron/MXene electrode for accelerating oxygen and hydrogen evolution at high current densities

Yu, Mengzhou; Wang, Zhiyu; Liu, Junshan; Sun, Fu; Yang, Pengju; Qiu, Jieshan

doi:10.1016/j.nanoen.2019.103880

Cited by 286 publications

(193 citation statements)

References 77 publications

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“…The contact angle testing confirms the excellent hydrophilic property of the as‐prepared materials (Figure S3, Supporting Information), demonstrating the good immersion wetting which accelerate the electrocatalytic reaction. [ 43 ] Figure 1d displays the high‐resolution TEM (HRTEM) image of the CoMn 2 O 4 nanoflake, in which the inter‐planar distance of about 2.47 Å could be indexed well to the (311) plane of CoMn 2 O 4 .…”

Section: Resultsmentioning

confidence: 99%

Bimetal Schottky Heterojunction Boosting Energy‐Saving Hydrogen Production from Alkaline Water via Urea Electrocatalysis

Wang

Mao

et al. 2020

Adv Funct Materials

227

163

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Hydrogen production via water electrocatalysis is limited by the sluggish anodic oxygen evolution reaction (OER) that requires a high overpotential. In response, a urea-assisted energy-saving alkaline hydrogen-production system has been investigated by replacing OER with a more oxidizable urea oxidation reaction (UOR). A bimetal heterostructure CoMn/CoMn 2 O 4 as a bifunctional catalyst is constructed in an alkaline system for both urea oxidation and hydrogen evolution reaction (HER). Based on the Schottky heterojunction structure, CoMn/CoMn 2 O 4 induces self-driven charge transfer at the interface, which facilitates the absorption of reactant molecules and the fracture of chemical bonds, therefore triggering the decomposition of water and urea. As a result, the heterostructured electrode exhibits ultralow potentials of −0.069 and 1.32 V (vs reversible hydrogen electrode) to reach 10 mA cm −2 for HER and UOR, respectively, in alkaline solution, and the full urea electrolysis driven by CoMn/CoMn 2 O 4 delivers 10 mA cm −2 at a relatively low potential of 1.51 V and performs stably for more than 15 h. This represents a novel strategy of Mott-Schottky hybrids in electrocatalysts and should inspire the development of sustainable energy conversion by combining hydrogen production and sewage treatment.

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Section: Resultsmentioning

confidence: 99%

Bimetal Schottky Heterojunction Boosting Energy‐Saving Hydrogen Production from Alkaline Water via Urea Electrocatalysis

Wang

Mao

et al. 2020

Adv Funct Materials

227

163

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“…In recent years, several studies are conducted to combine the MXene substrates with 0D nanomaterials (eg, Pt, P, Ag, TiO 2 , SnO 2 , Mn 3 O 4 , and Sb 2 O 3 ), 57,[80][81][82][83][84][85][86] 1D nanomaterials (eg, CNTs, and bacterial cellulose), [87][88][89] and 2D nanomaterials (eg, Layered double hydroxides (LDHs), Transition metal dichalcogenides (TMDs), and Metal-organic frameworks (MOFs)). [90][91][92][93] Furthermore, their applications in the field of electrochemical energy storage and conversion are systematically investigated. Hence, in this section, representative examples about nanostructures designed by 0D/1D/2D and MXene matrix are analyzed, and their energy storage and electrocatalysis mechanisms are discussed in detail.…”

Section: Mxene-based Hybrid Nanostructuresmentioning

confidence: 99%

“…Qiu and his coworkers used electrochemical deposition to synthesize mesoporous NiFelayered double hydroxides (NiFe-LDHs) nanosheets on Ti 3 C 2 MXene scaffolded by nickel foam (NF) (Ni-Fe-LDH/MXene/ NF). 92 The 3D MXene frame has high conductivity and hydrophilic property, which not only assists the mass/ charge transport across the catalyst, but also enhances the OER and hydrogen evolution reactions (HER) kinetics. Used as a binder-free electrocatalytic electrode, the Ni-Fe-LDH/MXene/NF achieves high current density of 500 mA cm −2 at low overpotential for OER (300 mV) and HER (205 mV) in 1.0 M KOH.…”

Section: Mxene-based Hybrid Nanostructuresmentioning

confidence: 99%

Interfacial structure design of MXene‐based nanomaterials for electrochemical energy storage and conversion

Luo

Matios

Wang

et al. 2020

InfoMat

155

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2D transition metal carbides, carbonitrides, and nitrides known as MXenes possess high electrical conductivity, large redox active surface area, rich surface chemistry, and tunable structures. Benefiting from these exceptional chemical and physical properties, the applications of MXenes for electrochemical energy storage and conversion have attracted increasing research interests around the world. Notably, the electrochemical performances of MXenes are directly dependent on their synthesis conditions, interfacial chemistries and structural configurations. In this review, we summarize the synthesis techniques of MXenes, as well as the recent advances in the interfacial structure design of MXene‐based nanomaterials for electrochemical energy storage and conversion applications. Additionally, we provide an in‐depth discussion on the relationship between interfacial structure and electrochemical performance from the perspectives of energy storage and electrocatalysis mechanisms. Finally, the challenges and insights for the future research of interfacial structure design of MXenes are outlined.

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“…Utilizing the density functional calculation, Du and colleagues have concluded that 2D MXenes, such as Ti 2 C, V 2 C, and Ti 3 C 2 , are terminated by a mixture of oxygen and hydroxyl, while Nb 2 C and Nb 4 C 3 O 2 are completely terminated by oxygen under standard conditions . Qiu's group developed a method applying 3D MXene as a multi‐functional support for water decomposition . (Figure b) The macroporous 3D MXene framework can not only promote the mass/charge transfer rate, but also accelerate the OER redox procedure.…”

Section: Electrochemical Energy Conversion and Storage Applicationsmentioning

confidence: 99%

MXene‐Based Nanocomposites for Energy Conversion and Storage Applications

Zhang

Tian

et al. 2020

Chemistry A European J

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Novel nanomaterials and advanced nanotechnology continuously push forwardt he rapid development of sustainable energy conversion and storage equipment. An emerging family of two-dimensional transition-metal carbides, nitrides and carbonitrides, also known as MXenes, have attracted increasing attention and in depth investigation. Benefitting from their unique intrinsic properties, MXenes have attracted significant attention and they have been considered as promising candidate materials for the development of environmentally friendly energy resources. Al arge number of studies show that MXenes have great potential in energy conversiona nd storagef ields. Despite of their exceptional properties, MXenes also have some inher-ent characteristics, such as low capacities and unstabler etention performances, which severely hinder their prospect applicationsi ne nergy conversion and storage fields. In this Minireview,t he latest progress on MXenes and their hybrid composites with small molecules, polymers, carbon or metal ions, and their applicationsinenergy conversionand storage fields is highlighted, including their use in different types of batteries, supercapacitors, hydrogen/oxygene volution reactions, electromagnetic interference absorption/shielding and solar steam generation. In addition, the critical challenges and further development prospects of MXene-based materials are also introduced.The ORCID identification number(s) for the author(s) of this articlecan be found under: https://doi.

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A hierarchically porous and hydrophilic 3D nickel–iron/MXene electrode for accelerating oxygen and hydrogen evolution at high current densities

Cited by 286 publications

References 77 publications

Bimetal Schottky Heterojunction Boosting Energy‐Saving Hydrogen Production from Alkaline Water via Urea Electrocatalysis

Bimetal Schottky Heterojunction Boosting Energy‐Saving Hydrogen Production from Alkaline Water via Urea Electrocatalysis

Interfacial structure design of MXene‐based nanomaterials for electrochemical energy storage and conversion

MXene‐Based Nanocomposites for Energy Conversion and Storage Applications

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