SajiD Naeem (PhD)’s Post

Interesting paper!! "Electrochemical impedance spectroscopy (EIS) is a powerful technique widely used for characterizing electrochemical systems, especially in the investigation of ion diffusion, electrochemical reactions, and charge transfer within lithium-ion batteries. Solid-state batteries (SSBs), envisioned for their potential to achieve high energy density and enhanced safety, comprise essential components-namely, a high-voltage cathode, a solid-state electrolyte (SSE), and a Li metal anode. While SSBs hold great promise, the utilization of EIS in studying SSBs is still in its infancy. Since various SSB systems exhibit different electrolyte properties (e.g., ionic conductivity, ionic transport activation energy, and ionic transference number) and interface properties (e.g., interface impedance and charge transfer impedance), the assignment of EIS features is highly controversial. Herein, this review provides an overview of the various SSE types and introduces the applied fundamentals of EIS in SSBs, including EIS basic theory, cell design and modeling methods. Subsequently, a common physical model for SSBs is summarized based on EIS research examples in SSBs. The assignment of each EIS features is discussed, and the corresponding equivalent circuit is also offered. Lastly, the review introduces emerging EIS-related technologies, laying the groundwork for future application in SSBs investigations. This review aims to enhance the understanding of SSBs and EIS, fostering the acceleration of SSBs from laboratory-scale experimentation to practical commercial applications." https://lnkd.in/emzE-umX

**********Physical Insights into High-Pressure Electrochemistry ************** The applications of electrochemical synthesis at elevated pressure are increasing. For instance, water splitting at high H2 delivery pressures, Li-mediated N2 reduction to ammonia, and CO2 reduction to liquid products. However, little is known about the underlying theories and practices in implementing high-pressure electrochemical reactors. Learn about the physics of high-pressure electrochemistry and its implementation from our recent article, "High-Pressure Electrochemistry - A New Frontier in Decarbonization," which explores the potential of high-pressure to improve selectivities (Faradaic efficiency), enhance kinetic rate (current density), lower cell potential (high voltage efficiency), and better catalysts stability. Published in the EES Catalysis journal, this Perspective sheds light on fundamental theories and practices. 💡 Electrochemical synthesis at high pressures can: (1) Help reduce the electrical energy demand with a marginal (~2%) contribution from energy to pressurize the reactor. (2) Shift Pourbaix lines more for redox reactions with the lower number of electrons. (3) Directly impact the binding energies of reaction intermediates. (4) Improve gas solubilities in liquid as well as in polymer-matrix. (5) Improve selectivity by suppressing HER/OER. Due to the electrostriction effect. (6) Increase capacitance of the double layer, helping in stabilizing intermediates. (7) Increase activity coefficient of electrolytes but also increase viscosity. (8) Decrease CAPEX and OPEX costs 🔬 Advanced Reactor Designs: >> We explore various reactor designs for high-pressure synthesis and in-situ characterization studies. >> We also discuss differential pressure, dynamic operation, and safety considerations. 📖 Read the Full Open Access Article: https://lnkd.in/gUh2c-gn Congratulations to lead author Nishithan C. Kani, Samuel Olusegun, Dr. Rohit Chauhan, and corresponding author Joseph Gauthier. #sustainablechemistry #highpressure #electrochemistry #GreenChemicals #Innovation

Novel material increases efficiency and stability of perovskite solar cells . In an article published in the Journal of Materials Chemistry C, Brazilian researchers describe a strategy to enhance the efficiency and stability of solar cells made of perovskite, a semiconductor material produced in the laboratory. The results of the project could be highly positive for the future of the solar power sector. #TechTrends #TechInnovationsDaily #DigitalFrontiers #FutureTechInsights

The efficiency of single-junction solar cells is fundamentally limited by the Shockley-Queisser (SQ) limit. One of the approaches to surpass the SQ limit is Singlet Fission (SF). Singlet fission (SF) is an effective multi electron generation process in organic semiconductors by which a photoexcited high-energy singlet exciton is converted into two low-energy triplet excitons. However, only few organic molecules and polymers show SF phenomena requiring detailed study. Here, we have demonstrated an up-to-date account of the investigation of the SF process in polymers, including the preferred mechanism. Check our recent review in ACS Photonics! #singletfission #solarcells https://lnkd.in/g_AxU_wW

🌟 Academic back-catalogue Ep. 3 🌟 Following on from the last episode: I took the best vanadium-doped lithium iron phosphate (LFP) cathode from a lab-study and worked with Melanie Loveridge at WMG, University of Warwick to assess its suitability for larger (industrially-relevant) cells. The results can be found below in Scientific Reports: https://lnkd.in/ebcFAiSa Many years on, I'm still incredibly grateful for Mel's time and assistance with this project, and for the wider WMG team for beginning my journey and learnings in scale-up battery manufacture. Getting back to the project - This was a real labour of love, requiring >500 g of cathode material to be made using a pilot-scale reactor. This is more material than I produced in the rest of my PhD put together! The LFP electrodes I made from this material (using roll-to-roll processing!) performed extremely well in terms of rate performance in coin-cells. However, there was an issue - evidence of side reactions (a low coulombic efficiency) even beyond the first cycle. When these LFP electrodes were partnered against silicon-based anodes in a full-cell, the capacity fade higher than expected: active lithium was being consumed too quickly to enable a resilient full-cell with a high cycle life. Unfortunately, there wasn't time or scope in the project to resolve that specific issue and progress further. However, I still I learnt an incredibly valuable lesson from this study - there are factors that you can mitigate/avoid in simple lab tests, but cause you problems later down the line in development. What does this mean to me, in my current role at Addionics? 💡 Developing high-performance materials that function well in a small test is really just the start of the journey to implement them in a large, functional device 💡 It's important to have a view on later requirements and specifications, even in early stage development of a material 💡 Interface with knowledgeable people and facilities to validate your materials and ideas, and learn as much as you can from them! #battery #electrode #cyclelife #facilities #lessonslearnt

It always feels good to present your research work in front of good people. So here is our work on understanding dynamic processes in electrochemical reactions, which remains lacking, hindering efficient catalyst design in water electrolysis. This work focuses on understanding electrochemical reactions through in-situ Raman characterization and ICP-MS analysis, shedding light on catalyst performance and degradation, particularly in OER and HER. In situ Raman spectroscopy offers real-time insights into membrane electrolyzer cell dynamics. We designed a three-electrode cell for in-situ Raman experiments, revealing changes in iridium-oxygen bonds and electronic structure. ICP-MS analysis quantifies catalyst dissolution, showing time and potential-dependent factors. This integrated approach enhances understanding of PEM water electrolysis cells, aiding in catalyst optimization for sustainable hydrogen production. #waterelectrolysis #insitucherecterization #ICPMS #catalyst #OER #HER #energy #InsituRAMAN #fuelcell #MEA #electrolysis

Dual-Electrode in situ Infrared Spectroscopy for Fuel Cells and Batteries   🔋  Georgetown University researchers, led by Dr. YUYE J. TONG, developed a new solution for in situ measurement of fuel cell and battery activity by using dual electrode infrared spectroscopy to provide a comprehensive view of fuel cells and batteries.   🎯 Why It Matters: Allows for the measurements of (1) chemical species in anodic reactions such as methanol oxidation and in cathodic reactions such as oxygen reduction reaction (ORR) and (2) chemical processes of forming and deteriorating solid-electrolyte interphase (SEI) through use of ATR-IRS measurements.   💡 How It Works: The technology utilizes a rotating dual electrode cell to measure in situ electrochemical attenuated-total-refection infrared spectroscopy (ATR-IRS) of fuel cells and batteries.   🚀 Advantages: - Measure the chemical processes at the anode and the cathode in operating fuel cells or rechargeable batteries during operation. - May lead to a better understanding of the operational chemistry of fuel cells and rechargeable batteries by allowing for a study of full components of fuel cells or rechargeable batteries during operation.  - Potentially enhance research on fuel cells and rechargeable batteries. 🔒 IP: This technology is protected by a US patent and available for licensing. Learn more:[https://lnkd.in/emXFAC4h] #FuelCells, #Batteries, #PowerSource, #Innovation, #Research

⚡️Ferroelectric materials are amazing. They have a very interesting and useful property: their surface chemistry is impacted in a pronounced way through a bulk parameter of theirs: electric polarization vector, which is controllable via external knobs including electric field, temperature, and light! This makes their surface chemistry dynamically controllable, tunable, and switchable! 👆This is cool and relatively-speaking unique! 📖 Back in 2015, using DFT-based quantum chemical calculations, we showed that using this property and via a dynamic catalytic process we can use ferroelectric materials to perform otherwise prohibited whole chemical reactions, with the specific example of direct decomposition of NO in oxygen-rich environment (important for automotive industry). In technical terms, this is catalysis beyond the Sabatier principle. Below, check this paper of ours out to get an idea of the huge potential here. ❕This class of materials has not yet received enough attention from the broader catalysis community, so the research here can be impactful and eye-opening. https://lnkd.in/e6khJ5mC #catalysis #materials #chemitry

“Cost-effective #nanorodelectrodes for #molecular #hydrogenproduction “ by Colleges of #Nanoscale Science and Engineering “Graphical abstract. Credit: Journal of Applied Electrochemistry (2024). DOI: 10.1007/s10800-023-02064-x” “SUNY Polytechnic Institute (SUNY Poly) Associate Professor of Electrical and Computer Engineering Technology Dr. Iulian Gherasoiu and peers have published research in the Journal of Applied Electrochemistry titled "MoVN-coated MoNi4-MoO2 #nanorods as a #bifunctionalelectrode for #electrochemical #watersplitting ."” “The emerging need for #clean and #renewableenergy drives the exploration of effective strategies to produce #molecularhydrogen , Gherasoiu explains. With the assistance of highly active, #nonnoblemetalelectrocatalysts , #electrolysis of water is a promising candidate to generate #purehydrogen with high efficiency.” “This research uncovers the properties of cost-effective MoVN/MoNi4-MoO2 nanorods that are synthesized using a two-step facile #hydrothermal method.” https://lnkd.in/eYbaqVwy Source - original post Read all my posts #MariusPreston

Sharing the link of my recent work- Title: Electrochemical impedance spectroscopy analysis and thermal mapping of different cross-sectional cathode channels in open-cathode polymer electrolyte membrane fuel cell stack. Link: https://lnkd.in/gmwqxV45 The key highlights of the research work are: 1. Understanding the fundamental mechanism for open cathode PEMFC 2. detailed parametric optimization utilizing EIS method 3. A hybrid EIS-AI algorithm for fault detection with an RMSE value of 0.98 I hope this work will motivate peers to come up with new ideas. In the future, I plan to enhance this work with more advanced and accurate methods that can be applied to real-life scenarios.