SENGENI, Anantharaj

写真a

Affiliation

Faculty of Science and Engineering, Waseda Research Institute for Science and Engineering

Job title

Junior Researcher(Assistant Professor)
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Concurrent Post 【 display / non-display 】

  • Faculty of Science and Engineering   School of Advanced Science and Engineering

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Education 【 display / non-display 】

  • 2014.05
    -
    2018.11

    Academy of Scientific and Innovative Research (AcSIR), Lab: CSIR - CECRI, Karaikudi, India   Science (Chemical)   Doctor of Philosophy  

  • 2011.06
    -
    2013.06

    The Presidency College, Chennai   Chemistry   Master of Science  

  • 2008.06
    -
    2011.05

    The Presidency College, Chennai   Chemistry   Bachelor of Science  

  • 2005.10
    -
    2007.11

    District Institute for Education and Training, Chennai   Teacher Education  

  • 2004.06
    -
    2005.05

    HSC, Tamil Nadu State Board  

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Research Experience 【 display / non-display 】

  • 2021.04
    -
    Now

    Waseda University   Department of Applied Chemistry   Assistant Professor   Part-time Lecturer

  • 2021.04
    -
    Now

    Waseda University   Research Institute for Science and Engineering   Assistant Professor   Junior Researcher

  • 2019.01
    -
    2021.03

    Waseda University   Department of Applied Chemistry   JSPS Postdoctoral Fellow

    22 months with 5 months paternity break

  • 2016.04
    -
    2018.10

    CSIR - Central Electrochemical Research Institute   Materials Electrochemistry   Senior Research Fellow (SRF) - CSIR

  • 2014.04
    -
    2016.04

    CSIR - Central Electrochemical Research Institute   Materials Electrochemistry   Junior Research Fellow (JRF) - CSIR

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Professional Memberships 【 display / non-display 】

  • 2019.07
    -
    Now

    American Chemical Society, USA

  • 2017.12
    -
    2018.12

    The Electrochemical Society, USA

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Research Areas 【 display / non-display 】

  • Nanomaterials

  • Fundamental physical chemistry

  • Energy chemistry

  • Analytical chemistry

  • Biophysics, chemical physics and soft matter physics

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Research Interests 【 display / non-display 】

  • Water Electrosplitting

  • Materials and Interfaces

  • Electrocatalysis

  • Electrochemistry

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Papers 【 display / non-display 】

  • Ru-tweaking of non-precious materials: The tale of a strategy that ensures both cost and energy efficiency in electrocatalytic water splitting

    S. Anantharaj

    Journal of Materials Chemistry A   9 ( 11 ) 6710 - 6731  2021.03  [Refereed]

    Authorship：Lead author, Corresponding author

    　View Summary

    Most better performing water splitting electrocatalysts are scarce, and their use increases the cost of production of H viaelectrolysis. Among the best performing noble/precious metal electrocatalysts, Ru is most notable because it acts as an excellent electrocatalyst for both oxidation and reduction reactions of water responsible for the H production. In fact, Ru outperforms Pt/C as the state-of-the-art water reduction electrocatalyst in alkali. However, the cost-wise more expensive Ru (than Pt and Ir) could not be extensively used in water electrolysis to avoid further increase in the cost of H production. Recently, there has been a renewed interest in Ru and is being intensively investigated with various structural and chemical modifications at the nano-level for catalytic water electrolysis with and without other materials. However, there is no comprehensive review that summarizes and analyzes recent developments in water splitting electrocatalysts that are modulated with Ru. Hence, this review is devoted to bringing out the strategies involved in harvesting the best of water splitting electrocatalysts by Ru-tweaking. The same is also benchmarked against their performance at different conditions. Besides, a detailed note on water splitting electrocatalysis and mechanisms involving Ru are given with insights on the phenomena that make it an active interface for water electrolysis. 2 2 2

    DOI

  • Surface amorphized nickel hydroxy sulphide for efficient hydrogen evolution reaction in alkaline medium

    Sengeni Anantharaj, Hisashi Sugime, Suguru Noda

    Chemical Engineering Journal   408  2021.03  [Refereed]

    Authorship：Lead author, Corresponding author

    　View Summary

    Non-oxide/hydroxide hydrogen evolution reaction (HER) catalysts undergo hydroxylation to a significant extent even under reductive condition when exposed to alkali. Actual role of such hydroxylation in alkaline HER electrocatalysis is not previously given any significance. In this study, we report an intriguing finding that nickel sulfide a well-known HER electrocatalyst when subjected to anodic potential cycling covering Ni and Ni redox couple led to accelerated hydroxylation accompanying surface amorphization. As a result, improved electrochemical surface, better HER kinetics, and better charge transfer were achieved that lowering the HER overpotential by 110 mV at 100 mA cm . This surface amorphized and hydroxylated nickel sulfide exhibited excellent stability upon both galvanostatic and potentiostatic electrolysis for over 50 h. Besides, it also showed a lower Tafel slope (120 mV dec ), higher relative ECSA in terms of 2C (3.85 µF cm ), and higher electrochemical accessibility for Ni sites (3.7 × 10 cm ) which further advocate the superiority of our way of improving HER activity of a non-oxide/hydroxide catalyst. Thus, this study open up new avenues for re-examining other non-oxide/hydroxide catalysts in alkaline HER for benefiting the energy and cost-efficient hydrogen generation. 2+ 3+ 2 -1 −2 17 −2 dl

    DOI

  • A bifunctional hexa-filamentous microfibril multimetallic foam: an unconventional high-performance electrode for total water splitting under industrial operation conditions

    Hashikaa Rajan, Maria Christy, Vasanth Rajendiran Jothi, S. Anantharaj, Sung Chul Yi

    Journal of Materials Chemistry A   9 ( 8 ) 4971 - 4983  2021.02  [Refereed]

    Authorship：Corresponding author

    　View Summary

    Cellulose in various forms possesses high strength, low density, and high aspect ratio with a three-dimensional open network structure, making them ideal candidates as current collectors in energy conversion application. Herein, a surface rough-cellulose-based bamboo fiber with unique and naturally-convoluted morphology is adopted for the fabrication of catalytically active cobalt substrates for water splitting. For the efficient evolution of hydrogen and oxygen, cobalt-based bimetallic alloys, namely, cobalt-molybdenum and cobalt-iron, were electrodeposited. The proposed system possesses a highly macro-porous network of hexa-filament micro-fibrils that demonstrate exceptional catalytic activities. In quantitative terms, the anodic and cathodic current density of 50 and −10 mA cm at respective overpotentials (η) of 250 and 46 mV with a low activation energy (E ) of 28 kJ mol were achieved. Moreover, when operated under harsh industrial standards of 5 M KOH@343 K, electrodes demonstrate excellent water electrolyzing catalytic activities (η = 147 mV;η = 209 mV). This work, thus, promises a new strategy for designing electrode systems that are highly efficient as well as economical as the substrate was obtained from a ubiquitous earth-friendly material for energy conversion application. −2 −1 a -100(HER) 100(OER)

    DOI

  • “The Fe Effect”: A review unveiling the critical roles of Fe in enhancing OER activity of Ni and Co based catalysts

    Sengeni Anantharaj, Subrata Kundu, Suguru Noda

    Nano Energy   80  2021.02  [Refereed]

    Authorship：Lead author, Corresponding author

    　View Summary

    Electrocatalytic oxygen evolution reaction (OER) catalyzed by non-precious metals and their compounds in alkaline medium is an attractive area of energy research for the generation of hydrogen from water. The 3d transition metals, particularly, Ni and Co show better OER activity than others in alkaline medium. Ni and Co based oxygen-evolving catalysts (OECs) experience an enormous enhancement in the OER activity either by incidental or intentional Fe doping/incorporation. To account for this, different roles of Fe that it exerts when incorporated into these OECs are reported to be responsible. Unfortunately, the conclusions drawn in many related studies are often contradictory to one another. Important contradictory conclusions are: 1) a few studies claim Fe is the active site and Ni/Co are inactive while other studies claim Ni/Co and Fe act together in OER, 2) a few studies claim Fe stays unoxidized while a few shows evidence for the existence of Fe , and 3) a few studies suggest Fe is the faster site in Ni/Co OEC matrices for OER but fail to explain similar effects observed with other OER matrices. Many critical experimental and theoretical investigations have been made recently to reveal this magical Fe effect and the results of those studies are coherently presented here with critical discussion. This review is presented as it is inevitable to know the critical roles of Fe effect in Ni/Co based OECs to succeed in energy efficient hydrogen generation in alkaline medium. 3+ 4+ 3+

    DOI

  • Pushing the Limits of Rapid Anodic Growth of CuO/Cu(OH)<inf>2</inf>Nanoneedles on Cu for the Methanol Oxidation Reaction: Anodization pH Is the Game Changer

    Sengeni Anantharaj, Hisashi Sugime, Shohei Yamaoka, Suguru Noda

    ACS Applied Energy Materials   4 ( 1 ) 899 - 912  2021.01  [Refereed]

    Authorship：Lead author, Corresponding author

    　View Summary

    We recently reported the fastest anodization method (just 80 s) of all for accessing a denser array of Cu(OH)2-CuO nanoneedles on a Cu foil substrate by applying a constant potential of 0.864 V vs a reversible hydrogen electrode in 1.0 M KOH that delivered a better activity for the methanol oxidation reaction (MOR). In this study, we show that the strength of the KOH solution used for anodization alters the size, morphology, surface chemistry, electrochemical accessibility of Cu sites, and the subsequent MOR activity trend. Intriguingly, an increase in KOH solution strength shortens the time of anodization from 80 s (1.0 M KOH) to 20 s with 3.0 M KOH, which in turn drastically reduces to just 6 s with 6.0 M KOH. As of now, this is the shortest time ever achieved for the anodic growth of Cu-OH/O nanoneedles on a Cu substrate. A set of detailed and comparative physical and electrochemical characterizations reveal positive relationships between anodization pH and anodization current, the size of Cu-OH/O nanoneedles grown, rate of growth, electrochemical accessibility of Cu sites, and electrocatalytic MOR activity. Thus, this study provides a universal approach to control the size of Cu-OH/O nanoneedles, electrochemical accessibility of Cu sites, and their subsequent MOR activity.

    DOI

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Awards 【 display / non-display 】

  • Distinguished Professor

    2021.03   Yangzhou University, China  

  • Favorite Tutor Award

    2020.09   Manonmanium Sundaranar University, Nellai, India  

  • JSPS Standard Postdoc Fellowship

    2018.08   JSPS, Japan  

  • ECS India Section S. K. Rangarajan Graduate Student Award

    2017.12   The Electrochemical Society, USA  

  • Senior Research Fellowship

    2016.01   CSIR, India  

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Research Projects 【 display / non-display 】

  • Mechanistic study on metal chalcogenides catalyzed water splitting for efficient hydrogen production

    Grant-in-Aid for JSPS Fellows

    Project Year :

    2019.04
    -
    2021.03
     

  • Mechanistic study on metal chalcogenides catalyzed water splitting for efficient hydrogen production

    Grant-in-Aid for JSPS Fellows

    Project Year :

    2018.11
    -
    2021.03
     

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Syllabus 【 display / non-display 】

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Teaching Experience 【 display / non-display 】

  • Chemistry

    2021.04
    -
    Now
     

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