Fast Proton Insertion in Layered H2W2O7 via Selective Etching of an Aurivillius Phase
- North Carolina State Univ., Raleigh, NC (United States)
- Univ. of California, Riverside, CA (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Abstract H 2 W 2 O 7 , a metastable material synthesized via selective etching of the Aurivillius‐related Bi 2 W 2 O 9 , is demonstrated as an electrode for high power proton‐based energy storage. Comprehensive structural characterization is performed to obtain a high‐fidelity crystal structure of H 2 W 2 O 7 using an iterative approach that combines X‐ray diffraction, neutron pair distribution function, scanning transmission electron microscopy, Raman spectroscopy, and density functional theory modeling. Electrochemical characterization shows a capacity retention of ≈80% at 1000 mV s –1 (1.5‐s charge/discharge time) as compared to 1 mV s –1 (≈16‐min charge/discharge time) with cyclability for over 100 000 cycles. Energetics from density functional theory calculations indicate that proton storage occurs at the terminal oxygen sites within the hydrated interlayer. Last, optical micrographs collected during in situ Raman spectroscopy show reversible, multicolor electrochromism, with color changes from pale yellow to blue, purple, and last, orange as a function of proton content. These results highlight the use of selective etching of layered perovskites for the synthesis of metastable transition metal oxide materials and the use of H 2 W 2 O 7 as an anode material for proton‐based energy storage or electrochromic applications.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS); Energy Frontier Research Centers (EFRC) (United States). Fluid Interface Reactions, Structures and Transport (FIRST) Center; Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
- Grant/Contract Number:
- AC05-00OR22725; ECCS-1542015; AC02-05CH11231; DEAC05‐00OR22725; DE‐AC02‐05CH11231
- OSTI ID:
- 1782035
- Alternate ID(s):
- OSTI ID: 1785561
- Journal Information:
- Advanced Energy Materials, Vol. 11, Issue 1; ISSN 1614-6832
- Publisher:
- WileyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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