Particle size dependence of proton conduction in a cationic lanthanum phosphonate MOF

Daniel A. Levenson; Jinfeng Zhang; Benjamin S. Gelfand; Sanoop P. Kammampata; Venkataraman Thangadurai; George K.H. Shimizu

doi:10.1039/c9dt04229f

Particle size dependence of proton conduction in a cationic lanthanum phosphonate MOF

Daniel A. Levenson, Jinfeng Zhang, Benjamin S. Gelfand, Sanoop P. Kammampata, Venkataraman Thangadurai, George K.H. Shimizu^*

^*Corresponding author for this work

School of Chemistry

Research output: Contribution to journal › Article › peer-review

19 Citations (Scopus)

Abstract

A lanthanum(iii) metal-organic framework, PCMOF21-AcO [La₂(H₂L)_1.5(AcO)₃·(H₂O)_5.59], with a 3-D network linked by dicationic bis(dimethylphosphonato)bipiperidinium units and both coordinated and free acetate counter anions is reported. PCMOF21-AcO was water stable and showed very good proton conductivity >10^-3 S cm^-1 at 85 °C and 95% relative humidity. PCMOF21-AcO also showed a bimodal particle size distribution and so proton conductivity was further examined as a function of particle size. Large (≥220 μm), intermediate (125 ≤ x < 180 μm) and small (<38 μm) particles were sieved and proton conductivity compared. The larger particle samples showed better proton conduction, an observation that supports grain boundaries being a hurdle to proton conduction rather than an enabler (e.g. by degradation routes enabling ion mobility). Proton conductivity as a function of pelletization pressure was also studied and affirmed that, for this system, the single semicircular feature observed in impedance analysis accounted for bulk and grain boundary contributions.

Original language	English
Pages (from-to)	4022-4029
Number of pages	8
Journal	Dalton Transactions
Volume	49
Issue number	13
Early online date	23 Mar 2020
DOIs	https://doi.org/10.1039/c9dt04229f
Publication status	Published - 7 Apr 2020

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@article{caa6c909b0a94b71b94e9f8c049620da,

title = "Particle size dependence of proton conduction in a cationic lanthanum phosphonate MOF",

abstract = "A lanthanum(iii) metal-organic framework, PCMOF21-AcO [La2(H2L)1.5(AcO)3·(H2O)5.59], with a 3-D network linked by dicationic bis(dimethylphosphonato)bipiperidinium units and both coordinated and free acetate counter anions is reported. PCMOF21-AcO was water stable and showed very good proton conductivity >10-3 S cm-1 at 85 °C and 95% relative humidity. PCMOF21-AcO also showed a bimodal particle size distribution and so proton conductivity was further examined as a function of particle size. Large (≥220 μm), intermediate (125 ≤ x < 180 μm) and small (<38 μm) particles were sieved and proton conductivity compared. The larger particle samples showed better proton conduction, an observation that supports grain boundaries being a hurdle to proton conduction rather than an enabler (e.g. by degradation routes enabling ion mobility). Proton conductivity as a function of pelletization pressure was also studied and affirmed that, for this system, the single semicircular feature observed in impedance analysis accounted for bulk and grain boundary contributions.",

author = "Levenson, {Daniel A.} and Jinfeng Zhang and Gelfand, {Benjamin S.} and Kammampata, {Sanoop P.} and Venkataraman Thangadurai and Shimizu, {George K.H.}",

note = "Publisher Copyright: {\textcopyright} 2020 The Royal Society of Chemistry.",

year = "2020",

month = apr,

day = "7",

doi = "10.1039/c9dt04229f",

language = "English",

volume = "49",

pages = "4022--4029",

journal = "Dalton Transactions",

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T1 - Particle size dependence of proton conduction in a cationic lanthanum phosphonate MOF

AU - Levenson, Daniel A.

AU - Zhang, Jinfeng

AU - Gelfand, Benjamin S.

AU - Kammampata, Sanoop P.

AU - Thangadurai, Venkataraman

AU - Shimizu, George K.H.

PY - 2020/4/7

Y1 - 2020/4/7

N2 - A lanthanum(iii) metal-organic framework, PCMOF21-AcO [La2(H2L)1.5(AcO)3·(H2O)5.59], with a 3-D network linked by dicationic bis(dimethylphosphonato)bipiperidinium units and both coordinated and free acetate counter anions is reported. PCMOF21-AcO was water stable and showed very good proton conductivity >10-3 S cm-1 at 85 °C and 95% relative humidity. PCMOF21-AcO also showed a bimodal particle size distribution and so proton conductivity was further examined as a function of particle size. Large (≥220 μm), intermediate (125 ≤ x < 180 μm) and small (<38 μm) particles were sieved and proton conductivity compared. The larger particle samples showed better proton conduction, an observation that supports grain boundaries being a hurdle to proton conduction rather than an enabler (e.g. by degradation routes enabling ion mobility). Proton conductivity as a function of pelletization pressure was also studied and affirmed that, for this system, the single semicircular feature observed in impedance analysis accounted for bulk and grain boundary contributions.

AB - A lanthanum(iii) metal-organic framework, PCMOF21-AcO [La2(H2L)1.5(AcO)3·(H2O)5.59], with a 3-D network linked by dicationic bis(dimethylphosphonato)bipiperidinium units and both coordinated and free acetate counter anions is reported. PCMOF21-AcO was water stable and showed very good proton conductivity >10-3 S cm-1 at 85 °C and 95% relative humidity. PCMOF21-AcO also showed a bimodal particle size distribution and so proton conductivity was further examined as a function of particle size. Large (≥220 μm), intermediate (125 ≤ x < 180 μm) and small (<38 μm) particles were sieved and proton conductivity compared. The larger particle samples showed better proton conduction, an observation that supports grain boundaries being a hurdle to proton conduction rather than an enabler (e.g. by degradation routes enabling ion mobility). Proton conductivity as a function of pelletization pressure was also studied and affirmed that, for this system, the single semicircular feature observed in impedance analysis accounted for bulk and grain boundary contributions.

U2 - 10.1039/c9dt04229f

DO - 10.1039/c9dt04229f

M3 - Article

C2 - 32202280

AN - SCOPUS:85082736520

SN - 1477-9226

VL - 49

SP - 4022

EP - 4029

JO - Dalton Transactions

JF - Dalton Transactions

IS - 13

ER -

Particle size dependence of proton conduction in a cationic lanthanum phosphonate MOF

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