Kevin Nathaniel Wood

Kevin Nathaniel Wood
San Diego State University | SDSU · Department of Mechanical Engineering

Materials Science, Ph.D.

About

48
Publications
13,940
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2,869
Citations
Introduction
Kevin N. Wood is a Professor at San Diego State University (SDSU) who specializes in electrochemical energy storage devices including lithium metal batteries, solid state batteries, Li-ion batteries and low temperature fuel cells. Before joining SDSU Dr. Wood was an adjunct professor in the Metallurgical and Materials Engineering department at the Colorado School of Mines and postdoctoral researcher at both the National Renewable Energy Laboratory and the University of Michigan. At SDSU Dr. Wood’s Interfacial Design Lab focuses on the areas of interfacial design, electrochemistry, and additive manufacturing.
Additional affiliations
July 2018 - present
San Diego State University
Position
  • Professor (Assistant)
January 2017 - July 2018
National Renewable Energy Laboratory
Position
  • PostDoc Position
November 2014 - January 2017
University of Michigan
Position
  • Research Associate

Publications

Publications (48)
Article
Full-text available
Solid-state electrolytes such as Li 2 S-P 2 S 5 compounds are promising materials that could enable Li metal anodes. However, many solid-state electrolytes are unstable against metallic lithium, and little is known about the chemical evolution of these interfaces during cycling, hindering the rational design of these materials. In this work, operan...
Article
Li metal anodes are often considered a “holy grail” in the field of rechargeable batteries. Accordingly, the research community continuously seeks new strategies to improve their cyclability and reduce interfacial degradation. However, many recent reports focus on approaches that mitigate the symptoms of poor performance due to dendrites without ad...
Article
Full-text available
Enabling ultra-high energy density rechargeable Li batteries would have widespread impact on society. However the critical challenges of Li metal anodes (most notably cycle life and safety) remain unsolved. This is attributed to the evolution of Li metal morphology during cycling, which leads to dendrite growth and surface pitting. Herein, we prese...
Article
Full-text available
Improvement of the performance of Li metal anodes is critical to enable high energy density rechargeable battery systems beyond Li-ion. However, a complete mechanistic understanding of electrode overpotential variations that occur during extended cycling of Li metal is lacking. Herein, we demonstrate that when using a Li metal electrode, the dynami...
Article
Full-text available
Heteroatom modification represents one of the largest studied areas of research related to nanostructured carbon materials, with integrated applications stretching from energy production and storage to sustainability and medical uses. While a wide variety of dopants (boron, phosphorus, iodine, fluorine, etc.) have been studied, doping carbon struct...
Article
Full-text available
Sulfide solid electrolytes (SEs) show promise for Li metal solid-state batteries due to their high ionic conductivities and relative ease of manufacturing. However, many sulfide SEs suffer from limited electrochemical stability against Li metal electrodes. In this work, we use a suite of operando analytical techniques to investigate the dynamics of...
Article
Full-text available
This work enables highly “uniform” and “reversible” deposition of Li metal in carbonate electrolytes through a one-time rapid oxidation and reduction (ROAR) treatment. Over the years, Li metal has been plagued with irreversible dendritic growths that create isolated and unusable structures called “dead Li”. Accumulation of dead Li negatively impact...
Article
Sulfide solid electrolyte (SE) materials show promise for high-performance solid-state batteries because of their high ionic conductivity and ease of processing. However, several sulfide electrolytes have suffered from chemical and electrochemical instability against Li metal anodes. Herein, we use a suite of operando microscopy and spectroscopy te...
Article
Because of the complexity, high reactivity, and continuous evolution of the silicon-electrolyte interphase (SiEI), "individual" constituents of the SiEI were investigated to understand their physical, electrochemical, and mechanical properties. For the analysis of these intrinsic properties, known SiEI components (i.e., SiO2, Li2Si2O5, Li2SiO3, Li3...
Article
Full-text available
Silicon anodes are promising for next-generation lithium-ion batteries due to high theoretical capacity. However, their performance and lifetime are currently limited by continuous electrolyte reduction and solid-electrolyte interphase (SEI) formation. Thus, SEI studies are important but often complicated due to the rough morphology of samples, bur...
Article
Silicon (Si) is a commonly studied candidate material for next-generation anodes in Li-ion batteries. A native oxide SiO2 on Si is often inevitable. However, it is not clear if this layer has positive or negative effect on the battery performance. This understanding is complicated by the lack of knowledge about the physical properties, and by convo...
Article
Full-text available
Accurate identification of chemical phases associated with the electrode and solid electrolyte interphase (SEI) is critical for understanding and controlling interfacial degradation mechanisms in lithium containing battery systems. To study these critical battery materials and interfaces X ray photoelectron spectroscopy (XPS) is a widely used techn...
Article
ZnSnN <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> (ZTN) has been proposed as a new earth abundant absorber material for photovoltaic (PV) applications. While carrier concentration has been reduced to values suitable for device implementation, other properties such as ionization potential, e...
Article
Succinic acid is a biomass-derived platform chemical that can be catalytically converted in the aqueous phase to 1,4-butanediol (BDO), a prevalent building block used in the polymer and chemical industry. Despite significant interest, limited work has been reported regarding sustained catalyst performance and stability under continuous aqueous phas...
Article
Full-text available
Lithium solid electrolytes are a promising platform for achieving high energy density, long-lasting, and safe rechargeable batteries, which could have widespread societal impact. In particular, the ceramic oxide garnet Li7La3Zr2O12 (LLZO) has been shown to be a promising electrolyte due to its stability and high ionic conductivity. Two major challe...
Article
Carbon materials are used in a diverse set of applications ranging from pharmaceuticals to catalysis. Nitrogen modification of car-bon powders has shown to be an effective method for enhancing both surface and bulk properties of as-received material for a number of applications. Unfortunately, control of the nitrogen modification process is challen...
Article
Full-text available
Improving the cycle life and failure resistance of lithium metal anodes is critical for next-generation rechargeable batteries. Here, we show that treating Li metal foil electrodes with ultrathin (∼2 nm) Al 2 O 3 layers using atomic layer deposition (ALD) without air exposure can prevent dendrite formation upon cycling at a current density of 1 mA/...
Article
The ability to synthesize semiconductor nanowires with deterministic and tunable control of orientation and morphology on a wide range of substrates, while high precision and repeatability are maintained, is a challenge currently faced for the development of many nanoscale material systems. Here we show that atomic layer deposition (ALD) presents a...
Article
Full-text available
This work compares the methanol oxidation performance and stability of a commercial PtRu/Carbon catalyst post modified with nitrogen against an unmodified counterpart in alkaline media. Commercially available Hi-Spec JM10000 (PtRu) was modified with nitrogen via ion implantation in order to modify those areas not shielded by the pre-existing cataly...
Article
A commercial PtRu/C catalyst postdoped with nitrogen demonstrates a significantly higher performance (∼10-20 % improvement) in the anode of an alkaline direct methanol fuel cell than an unmodified commercial PtRu/C catalyst control. The enhanced performance shown herein is attributed at least partially to the increased electrochemical surface area...
Thesis
Full-text available
Carbon materials represent one of the largest areas of studied research today, having integrated applications stretching from energy production and storage to medical use and far beyond. One of these many intriguing applications is fuel cells, which offers the promise of clean electricity through a direct electrochemical energy conversion process....
Article
This work investigates the effect of a high anodic potential treatment protocol on the performance of a direct methanol fuel cell (DMFC). DMFC membrane electrode assemblies (MEAs) with PtRu/C (Hi-spec 5000) anode catalyst are subjected to anodic treatment (AT) at 0.8 V vs. DHE using potentiostatic method. Despite causing a slight decrease in the el...
Article
This work illustrates the utility and improved performance of nitrogen-modified catalyst supports for direct methanol fuel cell (DMFC) applications. A unique two-step vapor-phase synthesis procedure is used to achieve the N-modification and Pt-Ru decoration of high surface-area carbon powders relevant to integration as electrocatalysts in fuel cell...
Article
Modification of physiochemical and structural properties of carbon-based materials though targeted functionalization is a useful way to improve the properties and performance of such catalyst materials. This work explores incorporation of dopants, including nitrogen, iodine and fluorine into the carbon structure of highly-oriented pyrolytic graphit...
Article
The performance and long-term stability of a direct-methanol fuel cell (DMFC) employing PtRu supported on nitrogen-modified carbon is compared with that of PtRu/C (Hi-spec 5000). The long-term stability test is carried by means of accelerated degradation testing (ADT) at an anodic potential of 0.8 V vs. DHE for 640h. The initial DMFC performance of...
Article
In situ small-angle x-ray scattering (SAXS) is used to investigate the electrochemical durability of Pt-Metal (Pt-M) catalysts sputtered onto nitrogen-modified high surface area carbon powder. The results demonstrate that nitrogen modification promotes catalyst durability through reduction of nanoparticle dissolution and coarsening. Although partic...
Article
Liquid crystalline materials are an attractive medium for many devices because they produce large electrically controllable shifts of the phase retardation. Relatively thick (10-100 micron) liquid crystal layers are needed for modern devices. However, the speed of these devices is inversely proportional to the square of the LC layer thickness. We m...

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Project
Develop catalytic processes and materials to extend the carbon chain length and and selectively remove oxygen to produce renewable hydrocarbon fuels and chemicals from microbial anaerobic acids. Technical focus on the performance of commercial and advanced catalyst materials, impact of biogenic impurities, and validation of final fuel and chemical properties through linked demonstration.