Synergetic Effect of NbH@h-BN on Dehydrogenation of LiBH4†

doi:10.7503/cjcu20160468

Abstract

Abstract:

NbH@h-BN was prepared by mechanically milling h-BN, NbCl₅ and LiH, and the samples were detected by X-ray diffraction(XRD), X-ray photoelectron spectroscopy(XPS), transmission electron microscopy(TEM) and energy dispersive spectrometry(EDS). The enhancement of NbH@h-BN on the dehydrogenation of LiBH₄ and its mechanism were investigated. The results showed that the onset dehydroge-nation temperature and the apparent activation energy(E_a) of LiBH₄ were reduced to 380 ℃ and 142.31 kJ/mol respectively after the addition of NbH@h-BN, and the dehydrogenation kinetics of LiBH₄ was improved significantly. These remarkable results are largely attributed to the nano NbH particles which were dispersed on the surface of h-BN stably.

Key words: Hydrogen storage material, LiBH4, Synergetic effect

CLC Number:

O611.6
O643

TrendMD:

TU Guoping, HE Jianling, XIAO Xuezhang, CHEN Lixin, REN Qianjiang, DU Xiyong, LUO Minger. Synergetic Effect of NbH@h-BN on Dehydrogenation of LiB $H 4 †$ [J]. Chem. J. Chinese Universities, 2016, 37(10): 1757.

Figures/Tables 9

Fig.1 XRD patterns of NbH@h-BN samples during preparationReaction time/h: a. 0; b. 1; c. 2; d. 4.

Fig.2 XPS spectra of NbH@h-BN samples during preparationReaction time/h: a. 0; b. 1; c. 2; d. 4.

Fig.3 TEM images of NbH@h-BN sample(A,B), neat h-BN(C) and HAADF-STEM image and the corresponding EDX spectrum of NbH@h-BN(D and the inset)

Fig.4 Dehydrogenation curves of samples S0, S1, S2 and S3

Fig.5 DSC curves(A) and MS spectra(B) of samples S0, S1, S2 and S3

Fig.6 DSC curves of samples S0(A), S1(B), S2(C) and S3(D) with different heating rates Heating rate/(K·min-1): a. 5.0; b. 7.5; c. 10.0; d. 12.5; e. 15.0.

Fig.7 Kissinger plots of different LiBH4 samplesa. Ball milled LiBH4, y=-23853x+20.7921, Ea=198.316 kJ/mol, R2=0.9890; b. LiBH4-0.03 NbHnano, y=-20645.6x+16.96, Ea=171.646 kJ/mol, R2=0.9977; c. LiBH4-0.03 h-BN, y=-18740x+14.7909, Ea=155.804 kJ/mol, R2=0.99863; d. LiBH4-0.03 NbH@h-BN, y=-17117x+14.84, Ea=142.31 kJ/mol, R2=0.99723.

Fig.8 Dehydrogenation curves of samples S0(a), S1(b), S2(c), S4(d) and S5(e) at 400 ℃

Fig.9 SEM images(A—C) and corresponding EDX elements map of Nb(D—F) of samples S4(A, D),S3(B, E) and S1(C, F) after dehydrogenation at 400 ℃Inset of (A) is the TEM image of NbHmicro. Inset of (B) is the TEM image of NbHnano.

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