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N7-(carboxymethyl)guanine-Lithium Crystalline Complex: A Bioinspired Solid Electrolyte.

Dutta D, Nagapradeep N, Zhu H, Forsyth M, Verma S, Bhattacharyya AJ - Sci Rep (2016)

Bottom Line: G7Li, with it's in-built supply of Li(+)-ions, exhibited remarkably high lithium-ion transference number (= 0.75) and tunable room temperature ionic conductivity spanning three decades (≈10(-7) to 10(-3) Ω(-1) cm(-1)) as a function of moisture content.The ionic conductivity show a distinct reversible transition around 80-100 °C, from a dual Li(+) and H(+) (<100 °C) to a pure Li(+) conductor (>100 °C).Systematic studies reveal a transition from water-assisted Li-ion transport to Li hopping-like mechanism involving guanine-Li coordination.

View Article: PubMed Central - PubMed

Affiliation: Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore-560012 (Karnataka), India.

ABSTRACT
Electrochemical device with components having direct significance to biological life processes is a potent futuristic strategy for the realization of all-round green and sustainable development. We present here synthesis design, structural analysis and ion transport of a novel solid organic electrolyte (G7Li), a compound reminiscent of ion channels, derived from regioisomeric N7-guanine-carboxylate conjugate and Li-ions. G7Li, with it's in-built supply of Li(+)-ions, exhibited remarkably high lithium-ion transference number (= 0.75) and tunable room temperature ionic conductivity spanning three decades (≈10(-7) to 10(-3) Ω(-1) cm(-1)) as a function of moisture content. The ionic conductivity show a distinct reversible transition around 80-100 °C, from a dual Li(+) and H(+) (<100 °C) to a pure Li(+) conductor (>100 °C). Systematic studies reveal a transition from water-assisted Li-ion transport to Li hopping-like mechanism involving guanine-Li coordination. While as-synthesized G7Li has potential in humidity sensors, the anhydrous G7Li is attractive for rechargeable batteries.

No MeSH data available.


Related in: MedlinePlus

(a) TGA profile of G7Li(33–800 °C; heating rate5 °C/min, N2 atmosphere) (inset: DSCprofile of G7Li (heating rate 5 °C/min,N2 atmosphere)). SEM images of (b) as-synthesized G7Liand (c) after heating the sample to 300 °C(Scale: 2 μm).
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f3: (a) TGA profile of G7Li(33–800 °C; heating rate5 °C/min, N2 atmosphere) (inset: DSCprofile of G7Li (heating rate 5 °C/min,N2 atmosphere)). SEM images of (b) as-synthesized G7Liand (c) after heating the sample to 300 °C(Scale: 2 μm).

Mentions: Thermal behaviour of G7Li is studied by thermogravimetric analysis (TGA) which isdepicted in Fig. 3a. The initial weight loss of 6.2% (at80.5 °C) corresponds to the loss of two water molecules fromthe complex. On further heating, a cusp is observed at around100 °C, followed by rapid decomposition after300 °C (stable up to~375 °C). The thermal (decomposition) propertiesof G7Li are better than many of the reported promising soft-matter (polymer)electrolytes414243. The thermal stability of G7Li up to~375 °C, which is sufficient for majority of theelectrochemical applications, however, is appreciably lower than any typical ceramicconductor. We envisage that this lower thermal stability range of G7Li is not goingto be a major disadvantage as this will be easily offset by its’ higherdegree of biocompatibility and sustainability compared to majority of the prevalentelectrolytes. Room temperature (RT) powder X-ray diffraction (PXRD) patterns ofas-synthesized G7Li and sample pre-heated to 300 °C are ingood agreement with the simulated diffraction patterns (c/f Figure S5 in the ESI).Subsequent SEM analysis revealed a rod-like morphology for the as-synthesized G7Lisample which is completely destroyed on heating the sample at300 °C (c/f Fig. 3b,c). However, thedestruction of the rod-like morphology does not imply the loss of crystallinity ofthe sample. This is confirmed by the PXRD pattern (Figure S5), DSC and ionicconductivity results (vide infra).


N7-(carboxymethyl)guanine-Lithium Crystalline Complex: A Bioinspired Solid Electrolyte.

Dutta D, Nagapradeep N, Zhu H, Forsyth M, Verma S, Bhattacharyya AJ - Sci Rep (2016)

(a) TGA profile of G7Li(33–800 °C; heating rate5 °C/min, N2 atmosphere) (inset: DSCprofile of G7Li (heating rate 5 °C/min,N2 atmosphere)). SEM images of (b) as-synthesized G7Liand (c) after heating the sample to 300 °C(Scale: 2 μm).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4835778&req=5

f3: (a) TGA profile of G7Li(33–800 °C; heating rate5 °C/min, N2 atmosphere) (inset: DSCprofile of G7Li (heating rate 5 °C/min,N2 atmosphere)). SEM images of (b) as-synthesized G7Liand (c) after heating the sample to 300 °C(Scale: 2 μm).
Mentions: Thermal behaviour of G7Li is studied by thermogravimetric analysis (TGA) which isdepicted in Fig. 3a. The initial weight loss of 6.2% (at80.5 °C) corresponds to the loss of two water molecules fromthe complex. On further heating, a cusp is observed at around100 °C, followed by rapid decomposition after300 °C (stable up to~375 °C). The thermal (decomposition) propertiesof G7Li are better than many of the reported promising soft-matter (polymer)electrolytes414243. The thermal stability of G7Li up to~375 °C, which is sufficient for majority of theelectrochemical applications, however, is appreciably lower than any typical ceramicconductor. We envisage that this lower thermal stability range of G7Li is not goingto be a major disadvantage as this will be easily offset by its’ higherdegree of biocompatibility and sustainability compared to majority of the prevalentelectrolytes. Room temperature (RT) powder X-ray diffraction (PXRD) patterns ofas-synthesized G7Li and sample pre-heated to 300 °C are ingood agreement with the simulated diffraction patterns (c/f Figure S5 in the ESI).Subsequent SEM analysis revealed a rod-like morphology for the as-synthesized G7Lisample which is completely destroyed on heating the sample at300 °C (c/f Fig. 3b,c). However, thedestruction of the rod-like morphology does not imply the loss of crystallinity ofthe sample. This is confirmed by the PXRD pattern (Figure S5), DSC and ionicconductivity results (vide infra).

Bottom Line: G7Li, with it's in-built supply of Li(+)-ions, exhibited remarkably high lithium-ion transference number (= 0.75) and tunable room temperature ionic conductivity spanning three decades (≈10(-7) to 10(-3) Ω(-1) cm(-1)) as a function of moisture content.The ionic conductivity show a distinct reversible transition around 80-100 °C, from a dual Li(+) and H(+) (<100 °C) to a pure Li(+) conductor (>100 °C).Systematic studies reveal a transition from water-assisted Li-ion transport to Li hopping-like mechanism involving guanine-Li coordination.

View Article: PubMed Central - PubMed

Affiliation: Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore-560012 (Karnataka), India.

ABSTRACT
Electrochemical device with components having direct significance to biological life processes is a potent futuristic strategy for the realization of all-round green and sustainable development. We present here synthesis design, structural analysis and ion transport of a novel solid organic electrolyte (G7Li), a compound reminiscent of ion channels, derived from regioisomeric N7-guanine-carboxylate conjugate and Li-ions. G7Li, with it's in-built supply of Li(+)-ions, exhibited remarkably high lithium-ion transference number (= 0.75) and tunable room temperature ionic conductivity spanning three decades (≈10(-7) to 10(-3) Ω(-1) cm(-1)) as a function of moisture content. The ionic conductivity show a distinct reversible transition around 80-100 °C, from a dual Li(+) and H(+) (<100 °C) to a pure Li(+) conductor (>100 °C). Systematic studies reveal a transition from water-assisted Li-ion transport to Li hopping-like mechanism involving guanine-Li coordination. While as-synthesized G7Li has potential in humidity sensors, the anhydrous G7Li is attractive for rechargeable batteries.

No MeSH data available.


Related in: MedlinePlus