Characterization and modeling of twinning superlattice structure in copper nanowires

Lee, Jheng-Syun; Weng, Wei-Lun; Liao, Chien-Neng

doi:10.1016/j.matlet.2017.02.017

Cited by 3 publications

(1 citation statement)

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“…In addition, when the twin lamella width reduces from 13.9 to 1.9 nm, the corresponding SAED pattern gradually turns diffusive and streaky (as illustrated with white arrows in the inset of Figure 1g). [30,31] This phenomenon also serves as a solid evidence to show that NTCu-5nm possesses a narrow distribution of twin lamella widths. as shown in Figure 2a and Figure S3a (Supporting Information).…”

Section: Catalyst Characterizationsmentioning

confidence: 70%

Twinning Enhances Efficiencies of Metallic Catalysts toward Electrolytic Water Splitting

Huang

Sasaki

Raja

et al. 2021

Advanced Energy Materials

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Presently, the most popular and economical commercial process of H 2 production is steam-methane reforming, which uses fossil fuels as the raw material and produces comparable amounts of CO 2 as the by-product. [1] It is definitely an environmental unfriendly and a non-sustainable H 2 production process, and development of green H 2 production is in urgent need. In this regard, renewable energy driven electrolytic water splitting has been gaining increasing popularity and is considered the most promising green H 2 production process for future hydrogen economy infrastructure. For electrolytic water splitting, H 2 is generated at cathodes from water reduction, the hydrogen evolution reaction (HER), and O 2 is generated at anodes from water oxidation, the oxygen evolution reaction (OER). To drive HER and OER at room temperature, a minimum thermodynamic cell voltage of 1.23 V is required. In practice, a cell voltage significantly higher than 1.23 V is required to overcome extra resistances existing in the water splitting system. [2] The extra cell voltage needed is the overpotential (η), which is the main target for electrocatalyst development to reduce its value for more efficient and thus more economically competitive hydrogen production for large-scale applications.Over the years, transition metals, particularly Fe, Ni, and Co based electrocatalysts, including alloys, [3] oxides, [4] phosphides, [5] sulfides, [6] etc. have been widely studied and exhibited excellent electrocatalytic performances toward water splitting reactions. Some of the metallic electrocatalysts showed excellent electrocatalytic activities for both HER and OER, and can be applied as bifunctional electrocatalysts for water splitting. Bifunctional electrocatalysts offer the advantage of material application convenience and many of them are multi-metal based materials such as NiFe and NiFeM. [7][8][9] Huang et al. fabricated NiFe nanotubes via a novel bubble-releasing assisted pulse electrodeposition method. These NiFe nanotubes exhibited outstanding bifunctional features in alkaline media with η 10 , η at 10 mA cm −2 , of 236 and 100 mV for the OER and HER, respectively. [7] Qin et al. used a hydrogen reduction method to coat NiFeMo alloy onto Ni foams, which showed impressive η 10 of 238 and 45 mV for the OER and HER, respectively. [8] Khalid et al. fabricated non-noble tri-metallic nanoparticles embedded Twinning is demonstrated to be an effective way of enhancing efficiencies of metallic catalysts toward electrolytic water splitting. Dendritic Cu possessing dense coherent nanotwin (NT) boundaries (NTCu-5nm) is successfully prepared with an organic-assisted electrodeposition at high pulse current densities. NT boundaries significantly improve electrocatalytic efficiencies and stability of NTCu-5nm over nanocrystalline Cu (NCCu), reducing overpotentials at 10 mA cm −2 for the oxygen evolution reaction (OER) from 378 to 281 mV and from 235 to 88 mV for the hydrogen evolution reaction (HER), with a small chronoamperometric decay of 5% after 100 ...

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Section: Catalyst Characterizationsmentioning

confidence: 70%