X-ray photoelectron spectroscopy of boron compounds

Il’inchik, E. A.; Волков, В. В.; Mazalov, L. N.

doi:10.1007/s10947-006-0133-y

Cited by 47 publications

(44 citation statements)

References 13 publications

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“…XPS analysis also confirmed a similar trend. As shown in Figure S5 in the Supporting Information, in as‐synthesized Ni/Nano‐AB components of the B(1s) spectrum corresponded to that of Bulk‐AB with binding energies at 190.01 and 188.40 eV related to BN and BH bonds in the H 3 BNH 3 structure, respectively. Upon hydrogen absorption and desorption, the binding energy related to BN in as‐synthesized Ni/Nano‐AB shifted from 190.01 eV to slightly higher values of 190.63 and 190.61 eV, respectively, and this was consistent with a oligo/polymeric (BH x NH x ) n structure .…”

Section: Resultsmentioning

confidence: 95%

Nanosizing Ammonia Borane with Nickel: A Path toward the Direct Hydrogen Release and Uptake of BNH Systems

Lai

Rawal

Quadir

et al. 2017

Advanced Sustainable Systems

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also favors hydrogen release at low temperatures.AB can release hydrogen through hydro lysis and thermolysis; and various attempts have been made to effectively extract hydrogen from both routes. [2][3][4][5][6] The activa tion energy for AB hydrolysis was meas ured to be between 21 and 87 kJ mol −1 , [7] compared to values ranging from 69.6 to 184 kJ mol −1 for thermolysis. [1,[8][9][10][11] Hence, the hydrolysis route following (1a) and/or (1b) is easier to activate with the assistance of a metalbased catalyst [12][13][14][15][16][17][18][19][20] NH BH 3H O NH B OH 3H 3 3 2 3 3 2 ( ) + → + + (1a) NH BH 4H O NH B OH 3H 3 3 2 4 4 2 ( )However, following (1a) and (1b) the maximum amount of hydrogen released is limited to 7.1 and 5.8 mass%, respectively owing to the remaining hydrogen in the NH 3 /NH 4 + products, [21] and this capacity is even lower in practical systems when considering any excess of H 2 O. The hydrolysis route also suffers from two major issues. In addition to the concomitant release of ammonia (NH 3 ) with hydrogen, the hydrolysis of AB is highly exothermic (≈−227 kJ mol −1 ) owing to the bond strength difference between BO and BN. [5] It is thus very difficult to regenerate NH 3 BH 3 from its hydrolyzed borate products, i.e., B(OH) 3 On the other hand the thermolysis of AB is a solid-gas reaction with potential of releasing a larger amount of hydrogen (theoret ically up to 19.6 mass%). It is generally proposed that through thermolysis hydrogen is released from AB via a multi step Ammonia borane (AB), with one of the highest hydrogen content (19.6 mass%), has attracted much attention as a potential hydrogen storage material. However, its complex and multistep thermal decomposition process has left the idea that AB can only be an irreversible hydrogen storage material. Herein, we demonstrate the potential of a novel nanosizing strategy in overcoming current drawbacks. By (a) successfully restricting the particle size of AB to the nanoscale (≈50 nm), and (b) discreetly encapsulating the synthesised nanosized AB particles within a nickel (Ni) matrix, AB showed unforeseen hydrogen reversibility along its decomposition path. Owing to the catalytic effect of Ni and the embedment of AB with the Ni matrix, this nanosizing approach reduced the hydrogen release temperature, suppressed the melting of AB and the production of volatiles by-products including diborane and borazine. But more remarkably, this approach enabled the reversible release and uptake of pure hydrogen at 200 °C and 6 MPa H 2 pressure, only. Reversibility is thought to occur through an iminoborane oligomer resulting from the initial decomposition of the nanosized AB/Ni matrix. This result demonstrates for the first time the possibility of tailoring.

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Section: Resultsmentioning

confidence: 95%

Nanosizing Ammonia Borane with Nickel: A Path toward the Direct Hydrogen Release and Uptake of BNH Systems

Lai

Rawal

Quadir

et al. 2017

Advanced Sustainable Systems

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“…The only known bonds resulting in similar binding energies are BePh-, BeCl-, BeN-or complex boronamide-groups. [22] Thus, the initial fraction of the second boron state should represent residuals from the production process, which are mainly chlorine anions according to the manufacturer. The PEI molecule contains many functional NH-and NH 2 -groups (c.f.…”

Section: Discussionmentioning

confidence: 99%

“…The XPS B 1s peak corresponding to SBH has been reported to be found at 187.4 eV [21,22]. The main features (I) of the spectra presented in Fig.…”

Section: Xpsmentioning

confidence: 91%

Interaction mechanism of hydrogen storage materials with layer-by-layer applied protective polyelectrolyte coatings

Sourkouni

Voigts

Namyslo

et al. 2014

International Journal of Hydrogen Energy

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“…29 The C1s graphite (C-C) peak at 284.3 eV was used to confirm the binding energy scale and the F1s peak for LiF at 685.0 eV was used as a secondary reference. 14,21,33 …”

Section: Methodsmentioning

confidence: 99%

Carbonate Free Electrolyte for Lithium Ion Batteries Containing γ-Butyrolactone and Methyl Butyrate

Lazar

Lucht

2015

J. Electrochem. Soc.

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A novel carbonate free electrolyte, 1 M lithium difluoro(oxalato) borate (LiDFOB) in 1:1 gamma-butyrolactone (GBL)/methyl butyrate (MB), has been compared to a standard electrolyte, 1 M LiPF 6 in 1:1:1 EC/DMC/DEC, and a 1 M LiDFOB in 1:1:1 EC/DMC/DEC electrolyte. The conductivity of 1 M LiDFOB in GBL/MB is higher at low temperature, but slightly lower at higher temperature compared to the standard electrolyte. The 1 M LiDFOB in GBL/MB electrolyte has comparable cycling performance to the standard electrolyte, and better cycling performance than the 1 M LiDFOB in EC/DMC/DEC electrolyte. The reversible cycling performance suggests that the LiDFOB in GBL/MB electrolyte forms a stable anode solid electrolyte interface (SEI) in the presence of GBL. Ex-situ surface analysis of the extracted electrodes has been conducted via a combination of XPS, FTIR-ATR and SEM which suggests that the stable anode SEI results is primarily composed of reduction products of LiDFOB. The widespread implementation of electric vehicles (EVs) requires further improvements in lithium ion batteries.1-3 Some of the biggest challenges for lithium ion batteries in EVs are cost, low temperature performance and battery lifetime.2,3 Improvements in the electrolyte can assist in the resolution of each of these problems.1,4,5 Most commercial electrolytes are composed of LiPF 6 in a mixture of carbonate solvents.5 However, the high cost and poor thermal and hydrolytic stability of LiPF 6 is problematic for the electrolyte.6-8 In addition, ethylene carbonate (EC) is typically a required component of the electrolyte due to the role of EC in the formation of the solid electrolyte interphase (SEI) on the anode. 5,9-14 Since EC is a solid at room temperature, electrolytes containing EC frequently have poor performance at low temperature.15 Despite the shortcomings of LiPF 6 / EC based electrolytes, these formulations have proven very difficult to replace. While there have been significant efforts to develop novel electrolytes with superior performance to LiPF 6 in carbonates, there has been limited success. The development of novel solvent systems has been more limited and frequently targeted toward specific problems such as high voltage cathodes, salt solubility, or reactivity issues. [16][17][18][19][20][21] The development of novel salts has encountered problems related to salt solubility and corrosion of the aluminum current collector on the cathode. 21,22 One of the more interesting and promising alternative salts is lithium difluoro(oxalato) borate (LiDFOB). 1,4,23,24 LiDFOB is promising due to good solubility, thermal stability, passivation of the aluminum current collector, stable SEI formation, and potentially lower cost. While there have been a limited number of investigations of LiD-FOB as the conducting salt in the electrolyte, 4,16,25 there have been several reports of the use of LiDFOB and the related salts lithium bis(oxalato) borate (LiBOB) and lithium tetrafluoro(oxalato) phosphate (LiTFOP) as additives to LiPF 6 based electrolytes to form...

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X-ray photoelectron spectroscopy of boron compounds

Cited by 47 publications

References 13 publications

Nanosizing Ammonia Borane with Nickel: A Path toward the Direct Hydrogen Release and Uptake of BNH Systems

Nanosizing Ammonia Borane with Nickel: A Path toward the Direct Hydrogen Release and Uptake of BNH Systems

Interaction mechanism of hydrogen storage materials with layer-by-layer applied protective polyelectrolyte coatings

Carbonate Free Electrolyte for Lithium Ion Batteries Containing γ-Butyrolactone and Methyl Butyrate

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