Hierarchical Layered Double Hydroxide Microspheres with Largely Enhanced Performance for Ethanol Electrooxidation

Shao, Mingfei; Ning, Fanyu; Zhao, Jingwen; Wei, Min; Evans, David G.; Duan, Xue

doi:10.1002/adfm.201202825

Cited by 113 publications

(79 citation statements)

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“…[36][37][38][39] Thus, NPCs were examined as metal-free catalysts for the ORR. [40][41][42][43][44][45] Correspondingly, the cyclic voltammogram (CV) curves of the NPCs were recorded in 0.1 M KOH solutions saturated with nitrogen or oxygen by using Ag/AgCl as the reference electrode.…”

Section: Communicationmentioning

confidence: 99%

Nitrogen‐Doped Porous Carbon Superstructures Derived from Hierarchical Assembly of Polyimide Nanosheets

et al. 2016

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3D carbon superstructures are fabricated through the hierarchical assembly of polyimide nanosheets and thermal treatment. Benefiting from the ultrahigh surface area and the hierarchically porous structure, along with the well-distributed highly electroactive sites, the flower-like carbon material exhibits outstanding catalytic activity toward the oxygen reduction reaction and also serves as a highly stable electrode material in supercapacitors.

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Section: Communicationmentioning

confidence: 99%

Nitrogen‐Doped Porous Carbon Superstructures Derived from Hierarchical Assembly of Polyimide Nanosheets

et al. 2016

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“…50,51 Fig. 4D shows the plots of k app and conversion versus the number of successive MO degradation that repeatedly employed the HAuNFs (concentration: 8 mg I −1 ) as catalyst.…”

Section: Catalytic Performances Of Haunfsmentioning

confidence: 99%

One-step fabrication of hollow-channel gold nanoflowers with excellent catalytic performance and large single-particle SERS activity

Benz

Wheeler

et al. 2016

Nanoscale

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Hollow metallic nanostructures have shown potential in various applications including catalysis, drug delivery and phototherapy, owing to their large surface areas, reduced net density, and unique optical properties. In this study, novel hollow gold nanoflowers (HAuNFs) consisting of an open hollow channel in the center and multiple branches/tips on the outer surface are fabricated for the first time, via a facile one-step synthesis using an auto-degradable nanofiber as a bifunctional template. The one-dimensional (1D) nanofiber acts as both a threading template as well as a promoter of the anisotropic growth of the gold crystal, the combination of which leads to the formation of HAuNFs with a hollow channel and nanospikes. The synergy of favorable structural/surface features, including sharp edges, open cavity and high-index facets, provides our HAuNFs with excellent catalytic performance (activity and cycling stability) coupled with large single-particle SERS activity (including ∼30 times of activity in ethanol electro-oxidation and ∼40 times of single-particle SERS intensity, benchmarked against similar-sized solid gold nanospheres with smooth surfaces, as well as retaining 86.7% of the initial catalytic activity after 500 cycles in ethanol electro-oxidation). This innovative synthesis gives a nanostructure of the geometry distinct from the template and is extendable to fabricating other systems for example, hollow-channel silver nanoflowers (HAgNFs). It thus provides an insight into the design of hollow nanostructures via template methods, and offers a versatile synthetic strategy for diverse metal nanomaterials suited for a broad range of applications.

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“…To overcome these problems, a broad range of non-precious metal catalysts have been actively pursued including metal [12], metal oxides [13], hydroxides [14] and sulfides [15]. Recently, layered double hydroxides (LDHs) have been reported as a promising candidate for various electrocatalytic systems [16–19] including EOR [18,19] owing to their novel structure and desirable properties. Nevertheless, the limited number of active sites due to the thick bulk form and the poor conductivity have hindered the further development of LDHs as EOR electrocatalysts.…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, the limited number of active sites due to the thick bulk form and the poor conductivity have hindered the further development of LDHs as EOR electrocatalysts. Several strategies such as fabricating hierarchical structured LDHs with enhanced surface area [18] and synthesizing their composites [19,20] have been developed. Although the enhanced EOR performances are obtained based on above methods, the results are still not so satisfactory for the application of DEFCs.…”

Section: Introductionmentioning

confidence: 99%

Ultrathin layered double hydroxide nanosheets with Ni(III) active species obtained by exfoliation for highly efficient ethanol electrooxidation

Wang

Chen

et al. 2018

Electrochimica Acta

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The development of non-precious metal electrocatalysts for renewable energy conversion and storage is compelling but greatly challenging due to low activity of the existing catalysts. Herein, the ultrathin NiAl-layered double hydroxide nanosheets (NiAl-LDH-NSs) are prepared by simple liquid-exfoliation of bulk NiAl-LDHs and first used as ethanol electrooxidation catalysts. The ultrathin two-dimensional (2D) structure ensures that the LDH nanosheets expose a greater number of active sites. More importantly, much Ni(III) active species (NiOOH) in the ultrathin nanosheets are formed by the exfoliation process, which play an authentic catalytic role in the ethanol oxidation reaction (EOR). The presence of NiOOH remarkably improves the reactivity and electrical conductivity of LDH nanosheets. These synergistic effects lead to strikingly more than 30 times enhanced EOR activity of NiAl-LDH-NSs compared to bulk NiAl-LDHs. The obtained electrocatalytic activity is also much better than those of most Ni- and LDH-based EOR catalysts reported to date. In addition, the ultrathin NiAl-LDH-NS electrocatalyst also exhibits good long-term stability (maintain 81.8% of the original value after 10000 s). This study not only provides a highly competitive EOR catalyst, but also opens new avenues toward the design of highly efficient electrode materials that have various potential applications in supercapacitor, Ni-MH battery and other electrocatalytic systems.

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Hierarchical Layered Double Hydroxide Microspheres with Largely Enhanced Performance for Ethanol Electrooxidation

Cited by 113 publications

References 50 publications

Nitrogen‐Doped Porous Carbon Superstructures Derived from Hierarchical Assembly of Polyimide Nanosheets

Nitrogen‐Doped Porous Carbon Superstructures Derived from Hierarchical Assembly of Polyimide Nanosheets

One-step fabrication of hollow-channel gold nanoflowers with excellent catalytic performance and large single-particle SERS activity

Ultrathin layered double hydroxide nanosheets with Ni(III) active species obtained by exfoliation for highly efficient ethanol electrooxidation

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