Travis M. Anderson

Sandia National Laboratories

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Harry D. Pratt

Lawrence Livermore National Laboratory

Craig L. Hill

Emory University

Kenneth I. Hardcastle

Emory University

Leo J. Small

Sandia National Laboratories

Chad Staiger

Sandia National Laboratories

Wade A. Neiwert

Emory University

Xikui Fang

Harbin Institute of Technology

May Nyman

Oregon State University

Bineta Keita

Centre National de la Recherche Scientifique

Rui Cao

Xi'an Jiaotong University

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Sandia National Laboratories

Sandia National Laboratories California

Emory University

National Technical Information Service

Los Alamos National Laboratory

University of New Mexico

Office of Scientific and Technical Information

Argonne National Laboratory

Centre National de la Recherche Scientifique

Center for Integrated Nanotechnologies

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Science (2012)

Travis M. Anderson Wade A. Neiwert Martin L. Kirk P.M.B. Piccoli Arthur J. Schultz

10.1126/science.337.6092.290-a

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Citations (6)

Through-Plane Conductivities of Membranes for Nonaqueous Redox Flow Batteries

Journal of The Electrochemical Society (2015)

Nicholas S. Hudak Leo J. Small Harry D. Pratt Travis M. Anderson

Nonaqueous redox flow batteries (RFB) leverage nonaqueous solvents to enable higher operating voltages compared to their aqueous counterparts. Most commercial components for flow batteries, however, are designed for aqueous use. One critical component, the ion-selective membrane, provides ionic conductance between electrodes while preventing crossover of electroactive species. Here we evaluate the area-specific conductances and through-plane conductivities of commercially available microporous separators (Celgard 2400, 2500) and anion exchange membranes (Neosepta AFX, Neosepta AHA, Fumasep FAP-450, Fumasep FAP-PK) soaked in acetonitrile, propylene carbonate, or two imidazolium-based ionic liquids. Fumasep membranes combined with acetonitrile-based electrolyte solutions provided the highest conductance values and conductivities by far. When tested in ionic liquids, all anion exchange membranes displayed conductivities greater than those of the Celgard microporous separators, though the separators' decreased thickness-enabled conductances on par with the most conductive anion exchange membranes. Ionic conductivity is not the only consideration when choosing an anion exchange membrane; testing of FAP-450 and FAP-PK membranes in a nonaqueous RFB demonstrated that the increased mechanical stability of PEEK-supported FAP-PK minimized swelling, in turn decreasing solvent mediated crossover and enabling greater electrochemical yields (40% vs. 4%) and Coulombic efficiencies (94% vs. 90%) compared to the unsupported, higher conductance FAP-450.

Limiting current

10.1149/2.0901510jes

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Citations (55)

Elucidating Instabilities Contributing to Capacity Fade in Bipyridine‐Based Materials for Non‐aqueous Flow Batteries

ChemElectroChem (2021)

Claudina X. Kolesnichenko Harry D. Pratt Leo J. Small Travis M. Anderson

Abstract Metal‐based non‐aqueous redox flow batteries have the potential for long‐term energy storage if stability requirements can be achieved. One such stability issue in metal coordination complexes arises from ligand shedding in the anolyte upon reduction. Recognizing that the free ligands are relatively more stable than the metal coordination complex under highly reducing conditions, we evaluated a family of metal‐free bipyridinium materials as flow battery anolytes with the corresponding iron coordination complex as the catholyte. Bipyridinium compounds were functionalized for increased electrochemical stability, cycled in flow cells to understand efficiencies, and analyzed for degradation products. Methylation of the bipyridine nitrogens increased electrochemical stability yet left the reduced molecule susceptible to radical‐induced bond cleavage. Subsequent functionalization of bipyridine with carbomethoxy groups resulted in good battery performance with 96 % Coulombic and 90 % voltage efficiency, and improved cycling stability over a methoxy‐substituted anolyte with 14 % vs 36 % capacity fade in the first charge‐discharge cycle.

Flow battery

Fade

Capacity loss

Bipyridine

10.1002/celc.202101490

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Citations (2)

Ionic Liquid Flow Batteries.

Travis M. Anderson Harry D. Pratt

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Citations (1)

Polyoxometalate flow battery

OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (2016)

Travis M. Anderson Harry D. Pratt

Polyoxometalate

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Lacunary Wells−Dawson Sandwich Complexes − Synthesis, Characterization, and Stability Studies of Multi‐Iron Species

European Journal of Inorganic Chemistry (2003)

Israël M. Mbomekallé Bineta Keita Louis Nadjo Wade A. Neiwert Lei Zhang

Abstract Reaction of α‐Na 12 (As 2 W 15 O 56 ) with Fe II in 1 M NaCl solution followed by air oxidation yields αααα‐H 2 Na 14 [(NaOH 2 ) 2 Fe III 2 (As 2 W 15 O 56 ) 2 ] (Na 2 ), the arsenic analogue of the divacant lacunary sandwich, αααα‐H 2 Na 14 [(NaOH 2 ) 2 Fe III 2 (P 2 W 15 O 56 ) 2 ] (Na 1 ). This complex (Na 2 ) consists of a Na 2 Fe 2 central unit sandwiched between two B‐α‐As 2 W 15 O 56 12− moieties. Both Na 1 and Na 2 react with one equivalent of Fe III to give ααβα‐Na 14 [(NaOH 2 )(Fe III OH 2 )(Fe III ) 2 (X 2 W 15 O 56 ) 2 ], where X = P (Na 3 ) or As (Na 4 ), or two equivalents of Mn II to give αββα‐Na 14 [(Mn II OH 2 ) 2 (Fe III ) 2 (X 2 W 15 O 56 ) 2 ], where X = P (Na 5 ) or As (Na 6 ). A single‐crystal X‐ray diffraction analysis of Na 5 has been carried out [ a = 13.5387(8) Å, b = 13.9327(9) Å, c = 21.3347(13) Å, α = 92.921(1) °, β = 94.367(1) °, γ = 118.154(1) °, triclinic, P $\bar 1$ , R 1 = 5.49%, based on 24662 independent reflections], which revealed a Mn 2 Fe 2 central unit sandwiched between two B‐α‐P 2 W 15 O 56 12− units. All of the new complexes have been characterized by FTIR spectroscopy, UV/Visible spectroscopy, elemental analyses, and cyclic voltammetry, and they are all stable for at least 24 h over a wide pH range (0−7), except for Na 4 , which is unstable below pH 2. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)

Lacunary function

Triclinic crystal system

10.1002/ejic.200300345

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Citations (54)

Estimation of Transport and Kinetic Parameters of Vanadium Redox Batteries Using Static Cells

ECS Transactions (2018)

Seong Beom Lee Harry D. Pratt Travis M. Anderson Kishalay Mitra Babu Chalamala

Mathematical models of Redox Flow Batteries (RFBs) can be used to analyze cell performance, optimize battery operation, and control the energy storage system efficiently. Among many other models, physics-based electrochemical models are capable of predicting internal states of the battery, such as temperature, state-of-charge, and state-of-health. In the models, estimating parameters is an important step that can study, analyze, and validate the models using experimental data. A common practice is to determine these parameters either through conducting experiments or based on the information available in the literature. However, it is not easy to investigate all proper parameters for the models through this way, and there are occasions when important information, such as diffusion coefficients and rate constants of ions, has not been studied. Also, the parameters needed for modeling charge-discharge are not always available. In this paper, an efficient way to estimate parameters of physics-based redox battery models will be proposed. This paper also demonstrates that the proposed approach can study and analyze aspects of capacity loss/fade, kinetics, and transport phenomena of the RFB system.

10.1149/08505.0043ecst

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Citations (4)

Cyclic Voltammetry Study of the Mn‐Substituted Polyoxoanions [Mn^II₄(H₂O)₂(H₄AsW₁₅O₅₆)₂]¹⁸⁻ and [((Mn^IIOH₂)Mn^II₂PW₉O₃₄)₂(PW₆O₂₆)]¹⁷⁻: Electrodeposition of Manganese Oxides Electrocatalysts for Dioxygen Reduction

Electroanalysis (2011)

Malika Ammam Bineta Keita Louis Nadjo Israël M. Mbomekallé Michelle D. Ritorto

Abstract The electrochemical behavior of two manganese (Mn)‐substituted polyoxoanions, the dissymmetrical Dawson sandwich‐type [Mn II 4 (H 2 O) 2 (H 4 AsW 15 O 56 ) 2 ] 18− and the Keggin sandwich banana‐shaped [((Mn II OH 2 )Mn II 2 PW 9 O 34 ) 2 (PW 6 O 26 )] 17− is investigated. At pH 5, the oxidation of the Mn II ‐centers results in one oxidation wave for [Mn II 4 (H 2 O) 2 (H 4 AsW 15 O 56 ) 2 ] 18− and two oxidation waves for [((Mn II OH 2 )Mn II 2 PW 9 O 34 ) 2 (PW 6 O 26 )] 17− . To the best of our knowledge, presence of the second Mn‐based wave is rarely observed in the electrochemistry of Mn‐containing polyoxometalates. Deposition of Mn‐oxides electrocatalysts for dioxygen reduction is noticed by cyclic voltammetry, which can be distinguished by the significant positive shift in potentials of the dioxygen reduction reaction.

10.1002/elan.201000735

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Citations (20)

Polyoxometalate‐Supported Y– and Yb^III–Hydroxo/Oxo Clusters from Carbonate‐Assisted Hydrolysis

Chemistry - A European Journal (2004)

Xikui Fang Travis M. Anderson Cristiano Benelli Craig L. Hill

Abstract Carbonate‐assisted hydrolysis of Y or Yb III ions in the presence of the trivacant Wells–Dawson polyoxoanion, α‐[P 2 W 15 O 56 ] 12− , produced two polyoxometalate‐supported Y– or Yb III –hydroxo/oxo clusters, which have been characterized by single‐crystal X‐ray structure determination. The structure of the Y complex consists of a distorted Y 4 (OH) 4 cubane cluster encapsulated by two lacunary α‐[P 2 W 15 O 56 ] 12− units, while the Yb cluster features a hexametallic core centered around a μ 6 ‐oxo atom with each ${{\rm Yb}{{{\rm III}\hfill \atop 3\hfill}}}$ triangular face capped by an oxo or a hydroxo group. Magnetization measurements of the ytterbium( III ) derivative suggested that intermolecular dipolar exchange is present at low temperatures (below 15 K). Despite its absence in the structures themselves, control experiments show that carbonate not only functions in the hydrolysis, it also influences the structure of the complexes by complexation to yttrium and the f‐block elements.

Polyoxometalate

Ytterbium

10.1002/chem.200400774

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Citations (123)

Electroactive Ionic Liquids: A New Approach To Flow Batteries.

Travis M. Anderson David Ingersoll Chad Staiger Karen Elizabeth Waldrip

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