A highly active oxygen evolution electrocatalyst: Ultrathin CoNi double hydroxide/CoO nanosheets synthesized via interface-directed assembly

Wu, Jun; Ren, Zhiyu; Du, Shichao; Kong, Lingjun; Liu, Bowen; Wu, Xi; Zhu, Jiaqing; Fu, Honggang

doi:10.1007/s12274-015-0950-4

Cited by 169 publications

(84 citation statements)

References 70 publications

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“…Similarly, the XPS peak of Ni 2p shows two distinct species, identified as Ni 2+ (2p 3/2 peak at 856.7 eV and 2p 1/2 peak at 872.3) and Ni 3+ (851.8 eV) . The other three peaks may be attributed to satellite peaks of Ni 2+ and Ni 3+ . These results imply that Fe and part of Ni in Ni−Fe LDH are existing at +3 oxidation state.…”

Section: Resultsmentioning

confidence: 72%

“…The presence of peaks corresponding to the binding energy of Fe 2p 1/2 (∼726.1 eV) and Fe 2p 3/2 (∼712.6 eV), indicates that the Fe species are in the +3 oxidation state ,. Similarly, the XPS peak of Ni 2p shows two distinct species, identified as Ni 2+ (2p 3/2 peak at 856.7 eV and 2p 1/2 peak at 872.3) and Ni 3+ (851.8 eV) . The other three peaks may be attributed to satellite peaks of Ni 2+ and Ni 3+ .…”

Section: Resultsmentioning

confidence: 97%

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Templated Synthesis of Nickel−Iron Layered Double Hydroxide for Enhanced Electrocatalytic Water Oxidation: Towards the Development of Non‐Precious‐Metal Catalysts

et al. 2017

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Layered double hydroxides (LDHs) have recently attracted intense research attention because of their applications in the development of highly active and cost‐effective electrocatalysts for the oxygen evolution reaction and in the fields of drug delivery, energy storage, for example. In this work, we report a cheap and simple route for the synthesis of nickel–iron LDH (Ni−Fe LDH) using an iron‐based metal−organic framework, Fe‐MIL‐88 as a template. The prepared Ni−Fe LDH is characterized by scanning electron microscopy, transmission electron microscopy, X‐ray photoelectron spectroscopy, Fourier‐transform infrared spectroscopy and X‐ray diffraction techniques. Ni−Fe LDH is found to be highly active and stable for water oxidation in alkaline solution as compared to commercial Pt/C. The concept of using a metal−organic framework as a structure‐directing agent to synthesize Ni−Fe LDH and the use of the material for the oxygen evolution reaction is explored for the first time.

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Section: Resultsmentioning

confidence: 72%

Section: Resultsmentioning

confidence: 97%

Templated Synthesis of Nickel−Iron Layered Double Hydroxide for Enhanced Electrocatalytic Water Oxidation: Towards the Development of Non‐Precious‐Metal Catalysts

et al. 2017

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“…Figure 6a represents the linear sweep voltammetry (LSV) curves at as can rate of 5mVs À1 .N otably,t he NiCo-LDH HNP delivers av ery low onset potentiala t1 .43 V( versus reversible hydrogen electrode, RHE), whereas the other two samples show much more positive onset potentials in the order of NF (1.48 V) < NP (1.49 V). [21,22,24,33,44,[53][54][55][56][57][58][59][60][61] To further study the electrocatalytic OER kinetics,T afel plots were derived from the linear regionso fL SV curves, and then fitted via the Ta fel empirical equation (h = b logj + a, where h is the overpotential, ji st he current density,a nd br efers to the Ta fel slope) ( Figure 6b). [11,26,33] Among three samples, NiCo-LDH HNP shows the lowest overpotential of 0.35 V @10 mA cm À2 ,w hich is much lower than those obtained with NF (0.39 V) and NP (0.46 V), revealing the nanosheet-assembled hollow architecture plays an important role for the high OER activity.I ti sw ell known that the reducedo verpotential of the electrode could enhancet he efficiency of energy harvest.…”

Section: Resultsmentioning

confidence: 99%

Multi‐Anion Intercalated Layered Double Hydroxide Nanosheet‐Assembled Hollow Nanoprisms with Improved Pseudocapacitive and Electrocatalytic Properties

Han

Cheng

et al. 2018

Chemistry An Asian Journal

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Electrochemically active hollow nanostructured materials hold great promise in diverse energy conversion and storage applications, however, intricate synthesis steps and poor control over compositions and morphologies have limited the realization of delicate hollow structures with advanced functional properties. In this study, we demonstrate a one-step wet-chemical strategy for co-engineering the hollow nanostructure and anion intercalation of nickel cobalt layered double hydroxide (NiCo-LDH) to attain highly electrochemical active energy conversion and storage functionalities. Self-templated pseudomorphic transformation of cobalt acetate hydroxide solid nanoprisms using nickel nitrate leads to the construction of well-defined NiCo-LDH hollow nanoprisms (HNPs) with multi-anion intercalation. The unique hierarchical nanosheet-assembled hollow structure and efficiently expanded interlayer spacing offer an increased surface area and exposure of active sites, reduced mass and charge transfer resistance, and enhanced stability of the materials. This leads to a significant improvement in the pseudocapacitive and electrocatalytic properties of NiCo-LDH HNP with respect to specific capacitance, rate and cycling performance, and OER overpotential, outperforming most of the recently reported NiCo-based materials. This work establishes the potential of manipulating sacrificial template transformation for the design and fabrication of novel classes of functional materials with well-defined nanostructures for electrochemical applications and beyond.

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“…Moreover, a 3D electrons or ions transport pathway was simultaneously created to exhibit high volumetric specific capacitance (38.9 F cm −3 ), good cycling performance and superb flexibility/mechanical stability. [229] Other types of ultrathin nanosheets were also used as supports to develop hybrids for better applications. [227] Recently, ultrathin nanosheets of multiple-component metal hydroxide were synthesized via the progressive decomposition of metal-boron nanocrystals (metals = Fe, Co, and Ni) to release boron species together with oxidized metal.…”

Section: Hybridization On Other Types Of Nanosheetsmentioning

confidence: 99%

Functionalized Hybridization of 2D Nanomaterials

Guan

Han

2019

Advanced Science

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The discovery of graphene and subsequent verification of its unique properties have aroused great research interest to exploit diversified graphene‐analogous 2D nanomaterials with fascinating physicochemical properties. Through either physical or chemical doping, linkage, adsorption, and hybridization with other functional species into or onto them, more novel/improved properties are readily created to extend/expand their functionalities and further achieve great performance. Here, various functionalized hybridizations by using different types of 2D nanomaterials are overviewed systematically with emphasis on their interaction formats (e.g., in‐plane or inter plane), synergistic properties, and enhanced applications. As the most intensely investigated 2D materials in the post‐graphene era, transition metal dichalcogenide nanosheets are comprehensively investigated through their element doping, physical/chemical functionalization, and nanohybridization. Meanwhile, representative hybrids with more types of nanosheets are also presented to understand their unique surface structures and address the special requirements for better applications. More excitingly, the van der Waals heterostructures of diverse 2D materials are specifically summarized to add more functionality or flexibility into 2D material systems. Finally, the current research status and faced challenges are discussed properly and several perspectives are elaborately given to accelerate the rational fabrication of varied and talented 2D hybrids.

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A highly active oxygen evolution electrocatalyst: Ultrathin CoNi double hydroxide/CoO nanosheets synthesized via interface-directed assembly

Cited by 169 publications

References 70 publications

Templated Synthesis of Nickel−Iron Layered Double Hydroxide for Enhanced Electrocatalytic Water Oxidation: Towards the Development of Non‐Precious‐Metal Catalysts

Templated Synthesis of Nickel−Iron Layered Double Hydroxide for Enhanced Electrocatalytic Water Oxidation: Towards the Development of Non‐Precious‐Metal Catalysts

Multi‐Anion Intercalated Layered Double Hydroxide Nanosheet‐Assembled Hollow Nanoprisms with Improved Pseudocapacitive and Electrocatalytic Properties

Functionalized Hybridization of 2D Nanomaterials

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