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PhD (IIT Kanpur), FASc
CSIR Emeritus Scientist
Convener,Talent Development Centre, IISc Kudapura
E-mail:  mshegde@sscu.iisc.ernet.in
Tel:  +91(0) 80 22932614
+91 (0) 80 22932336 Extn 2062
Lab: +91(0) 80 22932336 Extn. 2059, 2061, 2072

Solid State Chemistry and Catalysis, Electron Spectroscopy and Surface Science

Our research interest is broadly in the area of synthesis, structure and properties of new oxide materials, transition metal nitrides, epitaxial oxide films by pulsed laser deposition for electronic and ionic transport and heterogeneous catalysis. Study of electronic structure of solids and surfaces by X-ray photoelectron spectroscopy and their theoretical understanding by Density Functional Theory (DFT) calculations are our main research interests. Recently, we have pursued synthesis of nanocrystalline oxide materials by a novel solution combustion method. Substitution of noble metal ions in reducible oxides such as CeO2, TiO2, SnO2 and their derivatives are shown to be the best auto exhaust catalysts for CO and hydrocarbon oxidation and NO reduction. Solid solutions of the type Ce1-xMxO2-δ (noble metal, M = Pt, Pd, Rh, Ru, Cu, Ag, Au) made by solution combustion method showed orders of magnitude higher catalytic activity compared to the corresponding metal nano-crystallites  for a number of catalytic reactions such as hydrogen generation by water gas shift reaction, hydrogen-oxygen recombination, auto exhaust catalysis. The idea of noble metal ions associated with oxide ion vacancy as active sites for reducing and oxidizing molecules in these ionic catalysts  against only the metal atoms in metal nano particles  has opened up new ways to generate novel redox catalysts hitherto unknown in the literature.

Representative publications:

  1. ‘‘Noble Metal Ionic Catalysts”, M. S. Hegde, G. Madras, K. C. Patil, Acc. Chem. Res. 2009, 42(6), 704 (Cover Article).
  2. ‘‘Noble metal ionic catalysts: correlation of increase in CO oxidation activity with increasing effective charge on Pd ion in Pd ion substituted Ce1-xMxO2-δ (M = Ti, Zr and Hf)’’, Tinku Baidya, G. Dutta, M. S. Hegde, U. V. Waghmare, Dalton Trans.,2009, 3, 455.
  3. ‘‘High Oxygen Storage Capacity and High Rates of CO Oxidation and NO Reduction Catalytic Properties of Ce1-xSnxO2 and Ce0.78Sn0.2Pd0.02O2-δ’’, Tinku Baidya, Asha, Gupta, P. A. Deshpandey, G. Madras, M. S. Hegde, J. Phys. Chem. C , 2009, 113(10), 4059. 
  4. ‘‘Pt metal-CeO2 interaction: Direct observation of redox coupling between Pt0/Pt2+/Pt4+ and Ce4+/Ce3+ states in Ce0.98Pt0.02O2-δ catalyst by a combined electrochemical and x-ray photoelectron   spectroscopy study’’,  Sudhanshu Sharma, M. S. Hegde, J. Chem. Phys. 2009, 130(11), 114706.
  5.  “Ionic dispersion of Pt and Pd on CeO2 by combustion method: effect of metal ceria interaction on catalytic activities for NO reduction and CO oxidation and hydrocarbon oxidation”, Parthasarathi Bera; K.C. Patil; V. Jayaram; G.N. Subbanna; M.S. Hegde, J. Catal. (2000) 196, 293.
  6. “Structural investigation of combustion synthesized Cu/CeO2 catalysts by EXAFS and other physical techniques: formation of a Ce1-xCuxO2-d solid solution”, Parthasarathi Bera; K.R. Priolkar; P.R. Sarode; M.S. Hegde;  S. Emura; R. Kumashiro; N.P. Lalla,  Chem. Mater. (2002) 14, 3591.
  7. “Ce1-xRhXO2-δ solid solution formation in combustion synthesizedRh/CeO2 catalyst studied by XRD, TEM, XPS and EXAFS”, A.Gayen; K.R. Priolkar; P.R.Sarode; V. Jayaram; M.S. Hegde;
    S. Emura, Chem. Mater. (2004) 16, 2317.
  8. ‘‘Pd ion substituted CeO2: A superior de-NOx catalyst to Pt or Rh metal ion doped ceria’’, Sounak Roy, M. S. Hegde, Catal. Commun. 2008, 9(5), 811.
  9. ‘‘Ce2/3Cr1/3O2+y: A New Oxygen Storage Material Based on the Fluorite Structure’’, Preetam Singh, M. S. Hegde, J. Gopalakrishnan, Chem. Mater. 2008, 20(23), 7268.
  10.  ‘‘Ce1-xRuxO2-δ (x=0.05, 0.10): A New High Oxygen Storage Material and Pt, Pd-Free Three-Way Catalyst’’, Preetam Singh, M. S. Hegde, Chem. Mater. 2009, 21(14), 3337.
  11. “Origin of activation of lattice oxygen and synergistic interaction in bimetal-ionic Ce0.89Fe0.1Pd0.01O2-δ catalyst’’ Asha Gupta, A. Kumar, U.V. Waghmare, M. S. Hegde, Chem. Mater. (accepted for publication).
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