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Title: Metal–Organic Frameworks as Highly Active Electrocatalysts for High-Energy Density, Aqueous Zinc-Polyiodide Redox Flow Batteries

Abstract

This paper presents MOFs serving as catalysts are applicable in zinc-ployioidide redox flow batteries.

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE Office of Electricity Delivery and Energy Reliability (OE)
OSTI Identifier:
1324900
Report Number(s):
PNNL-SA-116994
Journal ID: ISSN 1530-6984; TE1400000
DOE Contract Number:
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Nano Letters; Journal Volume: 16; Journal Issue: 7
Country of Publication:
United States
Language:
English

Citation Formats

Li, Bin, Liu, Jian, Nie, Zimin, Wang, Wei, Reed, David, Liu, Jun, McGrail, Pete, and Sprenkle, Vincent. Metal–Organic Frameworks as Highly Active Electrocatalysts for High-Energy Density, Aqueous Zinc-Polyiodide Redox Flow Batteries. United States: N. p., 2016. Web. doi:10.1021/acs.nanolett.6b01426.
Li, Bin, Liu, Jian, Nie, Zimin, Wang, Wei, Reed, David, Liu, Jun, McGrail, Pete, & Sprenkle, Vincent. Metal–Organic Frameworks as Highly Active Electrocatalysts for High-Energy Density, Aqueous Zinc-Polyiodide Redox Flow Batteries. United States. doi:10.1021/acs.nanolett.6b01426.
Li, Bin, Liu, Jian, Nie, Zimin, Wang, Wei, Reed, David, Liu, Jun, McGrail, Pete, and Sprenkle, Vincent. Wed . "Metal–Organic Frameworks as Highly Active Electrocatalysts for High-Energy Density, Aqueous Zinc-Polyiodide Redox Flow Batteries". United States. doi:10.1021/acs.nanolett.6b01426.
@article{osti_1324900,
title = {Metal–Organic Frameworks as Highly Active Electrocatalysts for High-Energy Density, Aqueous Zinc-Polyiodide Redox Flow Batteries},
author = {Li, Bin and Liu, Jian and Nie, Zimin and Wang, Wei and Reed, David and Liu, Jun and McGrail, Pete and Sprenkle, Vincent},
abstractNote = {This paper presents MOFs serving as catalysts are applicable in zinc-ployioidide redox flow batteries.},
doi = {10.1021/acs.nanolett.6b01426},
journal = {Nano Letters},
number = 7,
volume = 16,
place = {United States},
year = {Wed Jul 13 00:00:00 EDT 2016},
month = {Wed Jul 13 00:00:00 EDT 2016}
}
  • Large-scale energy storage systems are crucial for substantial deployment of renewable energy sources. Energy storage systems with high energy density, high safety, and low cost and environmental friendliness are desired. To overcome the major limitations of the current aqueous redox flow battery systems, namely lower energy density (~25 Wh L -1) and presence of strong acids and/or other hazardous, a high energy density aqueous zinc/polyiodide flow battery (ZIB) is designed with near neutral ZnI 2 solutions as catholytes. The energy density of ZIB could reach 322 Wh L -1 at the solubility limit of ZnI 2 in water (~7 M).more » We demonstrate charge and discharge energy densities of 245.9 Wh/L and 166.7 Wh L-1 with ZnI 2 electrolyte at 5.0 M, respectively. The addition of ethanol (EtOH) in ZnI 2 electrolyte can effectively mitigate the growth of zinc dendrite at the anode and improve the stability of catholytes with wider temperature window (-20 to 50°C), which enable ZIB system to be a promising alternative as a high-energy and high- safety stationary energy storage system.« less
  • Improved metal-based redox flow batteries (RFBs) can utilize a metal and a divalent cation of the metal (M.sup.2+) as an active redox couple for a first electrode and electrolyte, respectively, in a first half-cell. For example, the metal can be Zn. The RFBs can also utilize a second electrolyte having I.sup.-, anions of I.sub.x (for x.gtoreq.3), or both in an aqueous solution, wherein the I.sup.- and the anions of I.sub.x (for x.gtoreq.3) compose an active redox couple in a second half-cell.
  • Intermittent energy sources, including solar and wind, require scalable, low-cost, multi-hour energy storage solutions in order to be effectively incorporated into the grid. All-Organic non-aqueous redox-flow batteries offer a solution, but suffer from rapid capacity fade and low Coulombic efficiency due to the high permeability of redox-active species across the battery's membrane. In this paper, we show that active-species crossover is arrested by scaling the membrane's pore size to molecular dimensions and in turn increasing the size of the active material above the membrane's pore-size exclusion limit. When oligomeric redox-active organics (RAOs) were paired with microporous polymer membranes, the ratemore » of active-material crossover was reduced more than 9000-fold compared to traditional separators at minimal cost to ionic conductivity. This corresponds to an absolute rate of RAO crossover of less than 3 μmol cm -2 day -1 (for a 1.0 m concentration gradient), which exceeds performance targets recently set forth by the battery industry. Finally, this strategy was generalizable to both high and low-potential RAOs in a variety of non-aqueous electrolytes, highlighting the versatility of macromolecular design in implementing next-generation redox-flow batteries.« less