Skip to Main Content U.S. Department of Energy
Energy and Environment Directorate

Greg Coffey

Greg Coffey

Pacific Northwest National Laboratory
PO Box 999
Richland, WA 99352
(509) 375-6602


Greg Coffey is a scientist in the Electrochemical Materials & Systems group. He received a BA, and MS in Materials Science and Engineering from Washington State University.

Research Interests

  • High temperature electrochemistry (600-1000C)
  • SOFC fuel cell, NOX, / O2 automotive exhaust sensors, environmental degradation
  • High pressure phase equilibria (+50KSI)
  • Diesel fuel, and synthetic analog wax/crystallite formation
  • Corrosion at elevated temperatures/pressures (300C,2000PSI)
  • Mechanistic studies of Zircalloy corrosion
  • Ionic conduction
  • H+, O-2 conduction in dense oxide electrolytes
  • Energy storage
  • Lithium, Nickle, Sodium, Lead acid

Education and Credentials

  • B.A. Materials Science and Engineering
  • M.S. Materials Science and Engineering

PNNL Patents

PNNL Publications


  • Bays J.T., R. Gieleciak, M.B. Viola, R.P. Lewis, J.R. Cort, K.B. Campbell, and G.W. Coffey, et al. 2022. "Detailed Compositional Comparison of Hydrogenated Vegetable Oil with Several Diesel Fuels and their Effect on Engine Emissions." SAE International Journal of Fuels and Lubricants 16, no. 3. PNNL-SA-166133. doi:10.4271/04-16-03-0015


  • Jones M.C., K.B. Campbell, M.J. Coffey, O.A. Marina, G.W. Coffey, A. Heredia-Langner, and J.C. Linehan, et al. 2020. "High-Pressure Apparatus for Monitoring Solid-Liquid Phase Transitions." Review of Scientific Instruments 91, no. 9:Article No. 094102. PNNL-SA-148023. doi:10.1063/5.0015518


  • Polikarpov E., C.A. Fernandez, G.W. Coffey, S.K. Nune, A.J. Karkamkar, B.J. Garcia, and T.L. Lemmon, et al. 2019. "Toward Polarization-Switched Molecular Pumps." ACS Applied Energy Materials 2, no. 6:4092-4097. PNNL-SA-138089. doi:10.1021/acsaem.9b00252


  • Overman N.R., X. Jiang, R.K. Kukkadapu, T. Clark, T.J. Roosendaal, G.W. Coffey, and J.E. Shield, et al. 2018. "Physical and electrical properties of melt-spun Fe-Si (3-8 wt%) soft magnetic ribbons." Materials Characterization 136. PNNL-SA-129219. doi:10.1016/j.matchar.2017.12.019



  • Viswanathan V.V., A.J. Crawford, D.E. Stephenson, S. Kim, W. Wang, B. Li, and G.W. Coffey, et al. 2014. "Cost and Performance Model for Redox Flow Batteries." Journal of Power Sources 247. PNNL-SA-91534. doi:10.1016/j.jpowsour.2012.12.023


  • Kim S., E.C. Thomsen, G. Xia, Z. Nie, J. Bao, K.P. Recknagle, and W. Wang, et al. 2013. "1 kW / 1kWh Advanced Vanadium Redox Flow Battery Utilizing Mixed Acid Electrolytes." Journal of Power Sources 237. PNNL-SA-92689. doi:10.1016/j.jpowsour.2013.02.045
  • Reed D.M., G.W. Coffey, E.S. Mast, N.L. Canfield, J. Mansurov, X. Lu, and V.L. Sprenkle. 2013. "Wetting of Sodium on ß?-Al2O3/YSZ Composites for Low Temperature Planar Sodium-Metal Halide Batteries." Journal of Power Sources 227. PNNL-SA-89519. doi:10.1016/j.jpowsour.2012.11.034
  • Vilayur Ganapathy S., M.I. Nandasiri, A.G. Joly, P.Z. El-Khoury, T. Varga, G.W. Coffey, and B. Schwenzer, et al. 2013. "Silver nanorod arrays for photocathode applications." Applied Physics Letters 103, no. 16:Article No. 161112. PNNL-SA-97756. doi:10.1063/1.4825262


  • Lu X., G.W. Coffey, K.D. Meinhardt, V.L. Sprenkle, Z. Yang, and J.P. Lemmon. 2010. "High Power Planar Sodium-Nickel Chloride Battery." ECS Transactions 28, no. 22:7-13. PNNL-SA-73438. doi:10.1149/1.3492326
  • Marina O.A., C.A. Coyle, E.C. Thomsen, D.J. Edwards, G.W. Coffey, and L.R. Pederson. 2010. "Degradation Mechanisms of SOFC Anodes in Coal Gas Containing Phosphorus." Solid State Ionics 181, no. 8-10:430-440. PNNL-SA-67342.
  • Yoon K.J., C.N. Cramer, E.C. Thomsen, C.A. Coyle, G.W. Coffey, and O.A. Marina. 2010. "Calcium- and Cobalt-doped Yttrium Chromites as an Interconnect Material for Solid Oxide Fuel Cells." Journal of the Electrochemical Society 157, no. 6:B856-B861. PNNL-SA-69520.


  • Coyle C.A., O.A. Marina, E.C. Thomsen, D.J. Edwards, C.N. Cramer, G.W. Coffey, and L.R. Pederson. 2009. "Interactions of nickel/zirconia solid oxide fuel cell anodes with coal gas containing arsenic." Journal of Power Sources 193, no. 2:730-738. PNNL-SA-65571. doi:10.1016/j.jpowsour.2009.04.042
  • Marina O.A., L.R. Pederson, C.A. Coyle, E.C. Thomsen, and G.W. Coffey. 2009. "Ni/YSZ Anode Interactions with Impurities in Coal Gas." ECS Transactions 25, no. 2:2125-2130. PNNL-SA-67224. doi:10.1149/1.3205760
  • Thomsen E.C., G.W. Coffey, L.R. Pederson, and O.A. Marina. 2009. "Performance of Lanthanum Strontium Manganite Electrodes at High Pressure." Journal of Power Sources 191, no. 2:217-224. PNNL-SA-62574.


  • Zhou X.D., L.R. Pederson, E.C. Thomsen, Z. Nie, and G.W. Coffey. 2008. "Nonstoichiometry and Transport Properties of Ca3Co4±xO9+d (x = 0 - 0.4)." Electrochemical and Solid-State Letters 12, no. 2:F1-F3. PNNL-SA-63405. doi:10.1149/1.3039948


  • Coffey G.W., L.R. Pederson, D.M. Ponds, P.C. Rieke, and E.C. Thomsen. 2007. "Fabrication and Characterization of a Novel Luggin Capillary Reference Electrode for use in Solid State Electrolytes." Solid State Ionics 178, no. 11-12:827-832. PNNL-SA-54159.
  • Marina O.A., L.R. Pederson, M.C. Williams, G.W. Coffey, K.D. Meinhardt, C.D. Nguyen, and E.C. Thomsen. 2007. "Electrode Performance in Reversible Solid Oxide Fuel Cells." Journal of the Electrochemical Society 154, no. 5:B452-B459. PNNL-SA-50946.
  • McCarthy B., L.R. Pederson, H.U. Anderson, X.D. Zhou, P. Singh, G.W. Coffey, and E.C. Thomsen. 2007. "Enhanced Shrinkage of Lanthanum Strontium Manganite (La0.90Sr0.10MnO3+d) Resulting from Thermal and Oxygen Partial Pressure Cycling." Journal of the American Ceramic Society 90, no. 10:3255-3262. PNNL-SA-53837. doi:10.1111/j.1551-2916.2007.01890.x


  • Yang Z., G.W. Coffey, J.P. Rice, P. Singh, J.W. Stevenson, and G. Xia. 2006. "High Temperature Corrosion Behavior of Oxidation Resistant Alloys under SOFC Interconnect Dual Exposures." In Advances in Solid Oxide Fuel Cells II: Ceramic Engineering and Science Proceedings, edited by NP Bansal, A Wereszczak and E Lara-Curzio, 27, 211-221. Westerville, Ohio:American Ceramic Society. PNNL-SA-48342. doi:10.1002/9780470291337.ch21
  • Zhou X.D., J. Yang, E.C. Thomsen, Q. Cai, B.J. Scarfino, Z. Nie, and G.W. Coffey, et al. 2006. "Electrical, Thermoelectric, and Structural Properties of La(MxFe1-x)O3 (M=Mn, Ni, Cu)." Journal of the Electrochemical Society 153, no. 12:J133-J138. PNNL-SA-50730.


  • Coffey G.W., J.S. Hardy, O.A. Marina, L.R. Pederson, P.C. Rieke, and E.C. Thomsen. 2005. "Copper Doped Lanthanum Strontium Ferrite for Reduced Temperature Solid Oxide Fuel Cells." In Fourteenth International Conference on Solid State Ionics, Jun 22-27 2003, Monterey, CA., USA. Published in Solid State Ionics, 175, 73-78. Amsterdam:Elsevier. PNNL-SA-44931.


  • Coffey G.W., J.S. Hardy, O.A. Marina, L.R. Pederson, P.C. Rieke, and E.C. Thomsen. 2004. "Copper Doped Lanthanum Strontium Ferrite for Reduced Temperature Solid Oxide Fuel Cells." Solid State Ionics 175, no. 1-4:73-78. PNNL-SA-46526. doi:10.1016/j.ssi.2004.09.015
  • Marina O.A., G.W. Coffey, L.R. Pederson, P.C. Rieke, E.C. Thomsen, and M.C. Williams. 2004. "ELECTRODE DEVELOPMENT FOR REVERSIBLE SOLID OXIDE FUEL CELLS." In 2004 Joint International Meeting, Fifth International Symposium on Ionic and Mixed Conducting Ceramics, 368-381. Pennington, New Jersey:Electrochemical Society. PNNL-SA-42319.


  • Coffey G.W., J.S. Hardy, L.R. Pederson, P.C. Rieke, and E.C. Thomsen. 2003. "Oxygen Reduction Activity of Lanthanum Strontium Nickel Ferrite." Electrochemical and Solid-State Letters 6, no. 6:A121-A124. PNNL-SA-38106.
  • Coffey G.W., J.S. Hardy, L.R. Pederson, P.C. Rieke, E.C. Thomsen, and M.B. Walpole. 2003. "Electrochemical Properties of Lanthanum Strontium Aluminum Ferrites for the Oxygen Reduction Reaction." Solid State Ionics 158, no. 1-2:1-9. PNNL-SA-36085.
  • Coffey G.W., L.R. Pederson, and P.C. Rieke. 2003. "Competition Between Bulk and Surface Pathways in Mixed Ionic Electronic Conducting Oxygen Electrodes." Journal of the Electrochemical Society 150, no. 8:A1139-A1151. PNNL-SA-36866.


  • Coffey G.W., J.S. Hardy, K.D. Meinhardt, O.A. Marina, and S.P. Simner. 2002. "All-Ceramic SOFC Tolerant to Oxygen, Carbon and Sulfur." In 2002 Fuel Cell Seminar: Fuel Cells - Reliable, Clean Energy for the World, November 19-21, 2002, Palm Springs, California., 295-298. Washington, District Of Columbia:Fuel Cell Seminar. PNNL-SA-39163.

Energy and Environment

Core Research Areas