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Hire Rajat K.

India

USD 50 /hr

PhD | Battery Electrode Materials Expert (Li/Na-ion) | R&D Consultant | FET, Photodetector & Sensor Materials Specialist

Profile Summary

I am a PhD in Chemistry with extensive research and industrial experience in battery electrode materials development for Li-ion and Na-ion batteries, along with a strong background in electronic materials for advanced devices. My core expertise includes: Synthesis and characterization of electrode materials (anode and cathode for Li/Na-ion systems) Electrolyte formulation optimization for enhanced performance and cycle life Battery cell assembly, testing protocols (CV, EIS, charge-discharge cycling), and failure analysis Materials design for FETs, photodetectors, and chemical sensors Expertise in various material characterization techniques (XRD, SEM, TEM, Raman, FTIR, BET) Previous Research Experience: Development of advanced electrode materials for high-energy density and long-life Li-ion & Na-ion batteries Material synthesis and device fabrication for field-effect transistors (FETs) and photodetectors Sensor materials development for environmental and chemical detection applications

Subject Matter Expertise

• ☆ Chemical Reagent Development
• ☆ Catalysis
• ☆ Trace Elements
• ☆ Surface Science
• ☆ Coordination Compounds
• ☆ Inorganic Chemistry
• ☆ Natural Product Chemistry
• ☆ Physical Chemistry
• ☆ Electrochemistry
• ☆ Agricultural Chemistry
• ☆ Cosmochemistry
• ☆ Radiochemistry
• ☆ Petrochemistry
• ☆ Green Chemistry
• ☆ Organometallic Chemistry
• ☆ Photochemistry
• ☆ Quantum Chemistry
• ☆ Theoretical Chemistry
• ☆ Thermochemistry
• ☆ Sonochemistry
• ☆ Peptide Synthesis
• ☆ Physical Organic Chemistry
• ☆ Adhesion Technology
• ☆ Applied Chemistry

Services

• Writing
• Research
• Consulting
• Product Development

Writing Technical Writing

Research Market Research, Technology Scouting, Gray Literature Search

Consulting Business Strategy Consulting, Manufacturing Consulting

Product Development Formulation, Recipe Development, Manufacturing, Quality Assurance & Control (QA/QC), Concept Development, Prototyping, Reverse Engineering, Device Fabrication

Work Experience

Scientists

MKS-Atotech

April 2024 - Present

Research Associates

IISc Bangalore

January 2023 - April 2024

Research Scientist

Gegadyne Energy, Mumbai

March 2022 - October 2022

Research Associates

IISc Bangalore

April 2021 - March 2022

Education

PhD

Indian Institute of Science Bangalore

August 2014 - March 2021

MSc

Indian Institute of Technology Roorkee

July 2012 - May 2014

BSc (Hons)

Hansraj College, Delhi University

July 2009 - June 2012

Certifications

• PhD Certificate

  IISc Bangalore

  April 2022 - Present

Publications

JOURNAL ARTICLE

Rajat Kumar, Pankaj Pareek, Sathish Deshagani, Wondwossen Melaku Yimer, Sampath Srinivasan (2025). Zn Makes a Difference: Cubic ZnBi₃₈O₆₀ as a Durable and High-Rate Anode for Rechargeable Na-Ion Batteries . ACS Applied Materials & Interfaces.

Rajat Kumar, Debashis Tripathy, Pankaj Pareek, Srinivasan Sampath (2024). A Copper Phosphosulfide-Based Highly Sensitive Ammonia Gas Sensor at Room Temperature . IEEE Sensors Journal.

Rajat Kumar, Ramesh Naidu Jenjeti, Sampath Srinivasan (2024). Layered 2D MoSe_{2(1–<i>x</i>)}Te_2<i>x</i> Alloys: Promising Thermoelectric Material with Tunable Thermal and Electrical Transport . The Journal of Physical Chemistry C.

Rajat Kumar, Ramesh Naidu Jenjeti, Kiran Vankayala, Sampath Srinivasan (2024). Quaternary, layered, 2D chalcogenide, Mo_1−xW_xSSe: thickness dependent transport properties . Nanotechnology.

Rajat Kumar, Ranjan Kumar Patel, Ramesh Naidu Jenjeti, Nandana Bhattacharya, Siddharth Kumar, Shashank Kumar Ojha, Zhan Zhang, Hua Zhou, Ke Qu, Zhen Wang, et al. (2023). Thickness dependent OER electrocatalysis of epitaxial thin film of high entropy oxide . Applied Physics Reviews.

Rajat Kumar, Ramesh Naidu Jenjeti, Kiran Vankayala, Sampath Srinivasan(2022). Optothermal and electrical properties of ultrathin alloys of mixed dichalcogenides . Journal of Materials Science. 57. (30). p. 14339--14355. Springer Science and Business Media {LLC}

Conductometric NOx sensor based on exfoliated two-dimensional layered MnPSe3 @article{2021, doi = {10.1016/j.snb.2021.130633}, url = {https://doi.org/10.1016%2Fj.snb.2021.130633}, year = 2021, month = {nov}, publisher = {Elsevier {BV}}, volume = {347}, pages = {130633}, author = {Rajat Kumar and Ramesh Naidu Jenjeti and Venkata Surya Kumar Choutipalli and Venkatesan Subramanian and S. Sampath}, title = {Conductometric {NOx} sensor based on exfoliated two-dimensional layered {MnPSe}3}} . Sensors and Actuators B: Chemical.

High Stability of 1T-Phase MoS2xSe2(1–x) Monolayers Under Ambient Conditions @article{2021, doi = {10.1021/acs.jpcc.1c00212}, url = {https://doi.org/10.1021%2Facs.jpcc.1c00212}, year = 2021, month = {apr}, publisher = {American Chemical Society ({ACS})}, volume = {125}, number = {15}, pages = {8407--8417}, author = {Ramesh Naidu Jenjeti and Rajat Kumar and A. Sellam and S. Sampath}, title = {High Stability of 1T-Phase {MoS}2xSe2(1{\textendash}x) Monolayers Under Ambient Conditions}} . The Journal of Physical Chemistry C.

Two-Dimensional, Few-Layer MnPS3 for Selective NO2 Gas Sensing under Ambient Conditions @article{2020, doi = {10.1021/acssensors.9b02064}, url = {https://doi.org/10.1021%2Facssensors.9b02064}, year = 2020, month = {jan}, publisher = {American Chemical Society ({ACS})}, volume = {5}, number = {2}, pages = {404--411}, author = {Rajat Kumar and Ramesh Naidu Jenjeti and S. Sampath}, title = {Two-Dimensional, Few-Layer {MnPS}3 for Selective {NO}2 Gas Sensing under Ambient Conditions}} . ACS Sensors.

Bulk and Few‐Layer 2D, p‐MnPS 3 for Sensitive and Selective Moisture Sensing @article{2019, doi = {10.1002/admi.201900666}, url = {https://doi.org/10.1002%2Fadmi.201900666}, year = 2019, month = {aug}, publisher = {Wiley}, volume = {6}, number = {20}, pages = {1900666}, author = {Rajat Kumar and Ramesh Naidu Jenjeti and Srinivasan Sampath}, title = {Bulk and Few-Layer 2D, p-{MnPS} 3 for Sensitive and Selective Moisture Sensing}} . Advanced Materials Interfaces.

Bulk and few-layer MnPS3: a new candidate for field effect transistors and UV photodetectors @article{2019, doi = {10.1039/c8tc05011b}, url = {https://doi.org/10.1039%2Fc8tc05011b}, year = 2019, publisher = {Royal Society of Chemistry ({RSC})}, volume = {7}, number = {2}, pages = {324--329}, author = {Rajat Kumar and Ramesh Naidu Jenjeti and Muthu P. Austeria and S. Sampath}, title = {Bulk and few-layer {MnPS}3: a new candidate for field effect transistors and {UV} photodetectors}} . Journal of Materials Chemistry C.

Two-dimensional, few-layer NiPS3 for flexible humidity sensor with high selectivity @article{2019, doi = {10.1039/c9ta03214b}, url = {https://doi.org/10.1039%2Fc9ta03214b}, year = 2019, publisher = {Royal Society of Chemistry ({RSC})}, volume = {7}, number = {24}, pages = {14545--14551}, author = {Ramesh Naidu Jenjeti and Rajat Kumar and S. Sampath}, title = {Two-dimensional, few-layer {NiPS}3 for flexible humidity sensor with high selectivity}} . Journal of Materials Chemistry A.

Rajat Kumar, Ramesh Naidu Jenjeti, S. Sampath (2019). Two-dimensional, few-layer NiPS3 for flexible humidity sensor with high selectivity . Journal of Materials Chemistry A.

Field Effect Transistor Based on Layered NiPS 3 @article{2018, doi = {10.1038/s41598-018-26522-1}, url = {https://doi.org/10.1038%2Fs41598-018-26522-1}, year = 2018, month = {jun}, publisher = {Springer Science and Business Media {LLC}}, volume = {8}, number = {1}, author = {Ramesh Naidu Jenjeti and Rajat Kumar and Muthu P. Austeria and S. Sampath}, title = {Field Effect Transistor Based on Layered {NiPS} 3}} . Scientific Reports.

A Facile Bottom-Up Approach to Construct Hybrid Flexible Cathode Scaffold for High-Performance Lithium–Sulfur Batteries @article{2016, doi = {10.1021/acsami.6b11180}, url = {https://doi.org/10.1021%2Facsami.6b11180}, year = 2016, month = {dec}, publisher = {American Chemical Society ({ACS})}, volume = {8}, number = {49}, pages = {33775--33785}, author = {Arnab Ghosh and Revanasiddappa Manjunatha and Rajat Kumar and Sagar Mitra}, title = {A Facile Bottom-Up Approach to Construct Hybrid Flexible Cathode Scaffold for High-Performance Lithium{\textendash}Sulfur Batteries}} . ACS Applied Materials & Interfaces.