Significant impact of individual surface and modulation structure on mechanical properties of NbN/NbB2 multilayers

Liu, Na; Dong, Lei; Jin, Shangxiao; Wan, Rongxin; Gu, Haitao; Li, Dejun

doi:10.1016/j.jallcom.2016.11.289

Cited by 17 publications

(6 citation statements)

References 31 publications

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“…For NbB 2 ‐MXene, two peaks located at 203.1 and 205.8 eV are corresponding to Nb bonded to B (NbB bonds). [ 27 ] And two pairs of peaks at 203.6 (206.5) and 207.2 eV (210.0) are related to Nb 5+ and Nb 2+ , which attributed to NbO bonds owing to the inevitable contamination of the surface exposure to air. Figure 2J displays the refined XPS spectrum of B 1s for NbB 2 ‐MXene and NbB 2 .…”

Section: Resultsmentioning

confidence: 99%

Expediting Stepwise Sulfur Conversion via Spontaneous Built‐In Electric Field and Binary Sulfiphilic Effect of Conductive NbB₂‐MXene Heterostructure in Lithium–Sulfur Batteries

Wang

et al. 2023

Adv Funct Materials

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Fabricating metal boride heterostructures and deciphering their interface interaction mechanism on accelerating polysulfide conversion at atomic levels are meaningful yet challenging in lithium–sulfur batteries (LSBs). Herein, novel highly‐conductive and binary sulfiphilic NbB2‐MXene heterostructures are elaborately designed with spontaneous built‐in electric field (BIEF) via a simple one‐step borothermal reduction strategy. Experimental and theoretical results reveal that Nb and B atoms can chemically bond with polysulfides, thereby enriching chemical anchor and catalytic active sites. Meanwhile, the spontaneous BIEF induces interfacial charge redistribution to make more electrons transferred to surface NbB2 sites, thereby weakening its strong adsorption property yet accelerating polysulfide transfer and electron diffusion on hetero‐interface, so providing moderate polysulfide adsorb‐ability yet decreasing sulfur‐species conversion energy barriers, further boosting the intrinsically catalytic activity of NbB2‐MXene for accelerated bidirectional sulfur conversion. Thus, S/NbB2‐MXene cathode presents high initial capacity of 1310.1 mAh g−1 at 0.1 C, stable long‐term lifespan with 500 cycles (0.076% capacity decay per cycle) at 1 C, and large areal capacity of 6.5 mAh cm−2 (sulfur loading: 7.0 mg cm−2 in lean electrolyte of 5 µL mgs−1) at 0.1 C. This work clearly unveils the mechanism of interfacial BIEF and binary sulfiphilic effect on accelerating stepwise sulfur conversion at atomic levels.

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Section: Resultsmentioning

confidence: 99%

Expediting Stepwise Sulfur Conversion via Spontaneous Built‐In Electric Field and Binary Sulfiphilic Effect of Conductive NbB₂‐MXene Heterostructure in Lithium–Sulfur Batteries

Wang

et al. 2023

Adv Funct Materials

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“…The deconvoluted Nb 3d spectra of the NbB 2 layer reveal the presence of five peaks (Figure 3A). The peaks located at 203.3 and 206.3 eV show the Nb–B bonding in NbB 2 , 36,37 and the peaks at 204.6, 208.0, and 210.6 eV indicate the presence of NbO, Nb 2 O 5 , and NbO x /Nb, respectively 37–39 . Deconvolution of the B 1s spectrum yields two peaks at 188.0 and 192.8 eV (Figure 3B).…”

Section: Resultsmentioning

confidence: 96%

“…Nb 3d spectra consist of four peaks at 205.5, 206.3, 208.0, and 210.6 eV corresponding to NbNO x , NbB 2 , Nb 2 O 5 , and NbO x /Nb, respectively 37,39,41 . Likewise, the high resolution N 1s spectra gives two peaks located at 396.6 and 398.5 eV, which can be attributed to N–B and Nb–N bonding, respectively 36,42 . The high‐resolution spectra of the Al 2p and O 1s of the Al 2 O 3 layer are shown in Figures 5A,B.…”

Section: Resultsmentioning

confidence: 98%

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Probing the spectrally selective property of NbB₂‐based tandem absorber coating for concentrated solar power application

2021

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Solar selective coating with good thermal stability is the primary requirement for a concentrated solar power (CSP) plant to function with better photothermal efficiency. In recent years, ultra-high-temperature ceramic-based coatings have been explored as potential materials for solar selective coatings. In this context, NbB 2 /Nb(BN)/Al 2 O 3 tandem absorber coating was designed to be fabricated on a stainless-steel substrate by the radio frequency magnetron sputtering of spark plasma sintered ceramic target. In the bulk form, the NbB 2 ceramic exhibits high solar absorptance (α = 0.756) and thermal emissivity (ε = 0.43), whereas the amorphous single NbB 2 coating exhibits α/ε = 0.716/0.13. Reactive sputtering of NbB 2 in nitrogen produced a semi-transparent coating with an optical bandgap of ∼2.80 eV and was used as the secondary absorber layer. Raman and X-ray photoelectron spectroscopy analyses reveal mild oxygen incorporation in the absorber layers. The developed SS/NbB 2 /Nb(BNO)/Al 2 O 3 tandem absorber exhibits a good solar absorptance of 0.950 and a moderate thermal emissivity of 0.15 at room temperature. The coatings exhibited good thermal stability when heated in vacuum for 5 h up to 700 • C, and the selectivity (α/ε) remains above 6. The present work shows the possibility of exploring NbB 2 -based tandem absorber coatings for CSP applications.

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“…The best fit deconvolution yielded three doublets, the component with lower binding energy (203.3 -206.8 eV) was attributed to Nb 3d 5/2 -Nb 3d 3/2 electrons of NbN compound19,20 . The doublet component at binding energy 204.0 eV (Nb 3d 5/2 ) was assigned to Nb-O-N oxynitrides17,20,21 . It could also be identified a small contribution from Nb-O oxide phases at 206 eV for Nb 3d 5/2 and 208.8 eV for Nb 3d 3/2 20,22,23…”

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confidence: 99%

Interrelation Among Morphology, Mechanical Properties and Oxidation Behavior of NbxAlyNz Thin Films

et al. 2019

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Nb x Al y N z thin films were deposited by magnetron sputtering reactive technique with (y/x+y) ratio varying from 0 to 0.4, in order to maintain aluminum atoms inside NbN matrix in solid solution. GAXRD analyses revealed that the crystalline phase obtained for Nb x Al y N z thin films was B1-NbN with a lattice constant shrinkage as Al concentration at these coatings was increased. Due to similarity in electro negativity values between Nb and Al, XPS analyses could not verify pronounced changes among as deposited Nb x Al y N z coatings. The average hardness values evidenced that solid solution strengthening mechanism did not increase hardness significantly. The oxidation resistance increased with Al content and no oxide phases were registered by GAXRD analyses for coating with more aluminum added. However, SEM images revealed bubbles after oxidation at high temperatures for all samples.

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Significant impact of individual surface and modulation structure on mechanical properties of NbN/NbB2 multilayers

Cited by 17 publications

References 31 publications

Expediting Stepwise Sulfur Conversion via Spontaneous Built‐In Electric Field and Binary Sulfiphilic Effect of Conductive NbB₂‐MXene Heterostructure in Lithium–Sulfur Batteries

Expediting Stepwise Sulfur Conversion via Spontaneous Built‐In Electric Field and Binary Sulfiphilic Effect of Conductive NbB₂‐MXene Heterostructure in Lithium–Sulfur Batteries

Probing the spectrally selective property of NbB₂‐based tandem absorber coating for concentrated solar power application

Interrelation Among Morphology, Mechanical Properties and Oxidation Behavior of NbxAlyNz Thin Films

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Significant impact of individual surface and modulation structure on mechanical properties of NbN/NbB2 multilayers

Cited by 17 publications

References 31 publications

Expediting Stepwise Sulfur Conversion via Spontaneous Built‐In Electric Field and Binary Sulfiphilic Effect of Conductive NbB2‐MXene Heterostructure in Lithium–Sulfur Batteries

Expediting Stepwise Sulfur Conversion via Spontaneous Built‐In Electric Field and Binary Sulfiphilic Effect of Conductive NbB2‐MXene Heterostructure in Lithium–Sulfur Batteries

Probing the spectrally selective property of NbB2‐based tandem absorber coating for concentrated solar power application

Interrelation Among Morphology, Mechanical Properties and Oxidation Behavior of NbxAlyNz Thin Films

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Expediting Stepwise Sulfur Conversion via Spontaneous Built‐In Electric Field and Binary Sulfiphilic Effect of Conductive NbB₂‐MXene Heterostructure in Lithium–Sulfur Batteries

Expediting Stepwise Sulfur Conversion via Spontaneous Built‐In Electric Field and Binary Sulfiphilic Effect of Conductive NbB₂‐MXene Heterostructure in Lithium–Sulfur Batteries

Probing the spectrally selective property of NbB₂‐based tandem absorber coating for concentrated solar power application