Nickel Nanoparticles Encapsulated in Few‐Layer Nitrogen‐Doped Graphene Derived from Metal–Organic Frameworks as Efficient Bifunctional Electrocatalysts for Overall Water Splitting

Xu, You; Tu, Wenguang; Zhang, Bowei; Yin, Shou-Wei; Huang, Yizhong; Kraft, Markus; Xu, Rong

doi:10.1002/adma.201605957

Cited by 541 publications

(377 citation statements)

References 67 publications

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“…To summarize,as eries of ultrathin MOF-74 nanosheets with abundant coordinatively unsaturated metal sites are synthesized through coordination assisted 2dOSA from their corresponding M-ONS,w hich cannot be obtained from the [39] a-CoSe/ Ti, [40] Co 9 S 8 /NOSC, [41] CoFePO, [42] CoP/NC, [43] CoNiP, [44] Ni-NiP, [44] Ni@NC-800/NF, [45] NiFeO x /CNF, [46] NiMo, [47] NiS/NF, [48] NiSe/NF, [49] N-Ni 3 S 2 -NF, [50] and Ni 5 P 4 . [51] delamination of their bulk counterparts or the conventional solvothermal method.…”

Section: Resultsmentioning

confidence: 99%

A Surfactant‐Free and Scalable General Strategy for Synthesizing Ultrathin Two‐Dimensional Metal–Organic Framework Nanosheets for the Oxygen Evolution Reaction

Zhuang

Liu

et al. 2019

Angewandte Chemie

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Metal-organic framework (MOFs) two-dimensional (2D) nanosheets have many coordinatively unsaturated metal sites that act as active centres for catalysis.T od ate,l imited numbers of 2D MOFs nanosheets can be obtained through topdown or bottom-up synthesis strategies.Herein, we report a2D oxide sacrifice approach (2dOSA) to facilely synthesizeultrathin MOF-74 and BTC MOF nanosheets with af lexible combination of metal sites,whichc annot be obtained through the delamination of their bulk counterparts (top-down)o rt he conventional solvothermal method (bottom-up). The ultrathin iron-cobalt MOF-74 nanosheets prepared are only 2.6 nm thick. The sample enriched with surface coordinatively unsaturated metal sites,e xhibits as ignificantly higher oxygen evolution reaction reactivity than bulk FeCo MOF-74 particles and the state-of-the-art MOF catalyst. It is believed that this 2dOSA could provideanew and simple way to synthesize various ultrathin MOF nanosheets for wide applications.

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Section: Resultsmentioning

confidence: 99%

A Surfactant‐Free and Scalable General Strategy for Synthesizing Ultrathin Two‐Dimensional Metal–Organic Framework Nanosheets for the Oxygen Evolution Reaction

Zhuang

Liu

et al. 2019

Angewandte Chemie

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“…Apart from ZIF-67, other Co-based MOFs, [67,[118][119][120] ZIF-8, [121] MOF-74, [53,122] Ni 2 (bdc) 2 ted (bdc = 1,4-benzenedicarboxylic acid; ted = triethylenediamine), [123] other Ni-based MOFs [124] and bimetallic MOFs (such as NiZn-MOF (ted as organic linkers), [125] NiFe-MOF (bdc as organic linkers), [126] NiCo-MOF (bdc as organic linkers) [65] ) are demonstrated as effective precursors for the fabrication of various interesting metal compounds and metal/ carbon composites for electrocatalytic water splitting. …”

Section: Overall Water Splittingmentioning

confidence: 99%

Metal–Organic Framework Based Catalysts for Hydrogen Evolution

Zhu

Zou

2018

Advanced Energy Materials

390

199

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society is still heavily relying on chemical fuels. Therefore, the essential and realistic approaches to environmental and energy issues remain to be the exploration of clean and sustainable energy sources, in order to meet the ever-increasing energy demand. Thanks to its high energy density and environmental friendliness, hydrogen fuel comes into play as a muchanticipated new energy carrier, which is under intensive studies in the academic field. [4] Furthermore, we are already in the new era witnessing the transformation of hydrogen-powered technologies from science fictions to realities. UK is already in the process of replacing their traditional diesel-powered double decker buses with the hydrogen-powered version, which aims to phase out the former by 2018. [5] China announced its world's first hydrogen-powered tram, which was put into business service in the latter half of 2017. [6] Mercedes-Benz had even started its development of personal hydrogen-powered car, and Toyota had commercialized its hydrogen fuel-cell car branded "Mirai." [7,8] However, one critical issue remains to be the conflict between the hydrogen production efficiency and the demand for the mass distribution of hydrogen-powered technologies.Current industrial hydrogen production methods include coal gasification (followed by water-gas shift reaction), steam reforming, cryogenic distillation, and water splitting. [9] Coal gasification and steam reforming utilize the reaction between conventional fossil fuels and water to produce syngas (primarily CO and H 2 ) or CO 2 and H 2 mixture. However, both reactions require high temperatures (can be over 1000 °C) and pressures, which is an energy intensive process and has strict requirements on infrastructures. [10] The reaction products also need to be further separated to obtain relatively high-concentration of hydrogen. Cryogenic distillation takes the advantage of difference in gas boiling points, which can be applied to separate hydrogen from other gas components in the former two hydrogen production methods. However, cryogenic distillation is also an energy intensive process for low-temperature gas liquification. In comparison, hydrogen evolution reaction (HER) through water splitting is much-favored because of the following three prominent advantages: 1) Water splitting can be carried out at room temperature and ambient pressure, which is less restricted by infrastructure requirements. 2) Oxygen and hydrogen can be produced separately or selectively, which eliminate the need for gas separation. 3) Both the hydrogen source Highly efficient hydrogen evolution reactions (HERs) will determine the mass distributions of hydrogen-powered clean technologies in the future. Metal-organic frameworks (MOFs) are emerging as a class of crystalline porous materials. Along with their derivatives, MOFs have recently been under intense study for their applications in various hydrogen production techniques. MOF-based materials possess unique advantages, such as high specific surface area, crystalline porous str...

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“…And NiFe NP posesses au nit cell of a = b = 2.64851 , c = 4.3423 . [15] X-ray photoelectron spectroscopy (XPS) was applied to determine the surface composition and chemical state of each element of hcp-NiFe@NC.F ive elements including Ni, Fe,C , N, and Oare identified from the XPS full spectra in Figure S6. Thefurther structural information of NiFeN Pw as acquired by the selected area electron diffraction (SAED).…”

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confidence: 99%

NiFe Alloy Nanoparticles with hcp Crystal Structure Stimulate Superior Oxygen Evolution Reaction Electrocatalytic Activity

et al. 2019

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Tuning the crystal phase of metal alloy nanomaterials has been proved as ignificant way to alter their catalytic properties based on crystal structure and electronic property. Herein, we successfully developed as imple strategy to controllably synthesize ar are crystal structure of hexagonal close-packed (hcp) NiFen anoparticle (NP) encapsulated in aN -doped carbon (NC) shell (hcp-NiFe@NC). Then, we systemically investigated the oxygen evolution reaction (OER) performance of the samples under alkaline conditions,i n which the hcp-NiFe@NC exhibits superior OER activity compared to the conventional face-centered cubic (fcc) NiFe encapsulated in aN-doped carbon shell (fcc-NiFe@NC). At the current densities of 10 and 100 mA cm À2 ,t he hcp-NiFe@NC with Fe/Ni ratio of % 5.4 %only needs ultralow overpotentials of 226 mV and 263 mV versus reversible hydrogen electrode in 1.0 m KOHe lectrolyte,r espectively,w hich were extremely lower than those of fcc-NiFe@NC and most of other reported NiFe-based electrocatalysts.W ep roposed that hcp-NiFep ossesses favorable electronic property to expedite the reaction on the NC surface,r esulting higher catalytic activity for OER. This researchp rovides an ew insight to design more efficient electrocatalysts by considering the crystal phase correlated electronic property.

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Nickel Nanoparticles Encapsulated in Few‐Layer Nitrogen‐Doped Graphene Derived from Metal–Organic Frameworks as Efficient Bifunctional Electrocatalysts for Overall Water Splitting

Cited by 541 publications

References 67 publications

A Surfactant‐Free and Scalable General Strategy for Synthesizing Ultrathin Two‐Dimensional Metal–Organic Framework Nanosheets for the Oxygen Evolution Reaction

A Surfactant‐Free and Scalable General Strategy for Synthesizing Ultrathin Two‐Dimensional Metal–Organic Framework Nanosheets for the Oxygen Evolution Reaction

Metal–Organic Framework Based Catalysts for Hydrogen Evolution

NiFe Alloy Nanoparticles with hcp Crystal Structure Stimulate Superior Oxygen Evolution Reaction Electrocatalytic Activity

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