Hernan Sanchez
Hernan G. Sanchez-Casalongue, Ph.D.
Senior Scientist
Polymer Science & Materials Chemistry
  • Menlo Park

A chemist by training, Dr. Sanchez’s background encompasses both materials synthesis and characterization, specializing in the optimization of electrocatalytic processes for batteries and renewable energy. His experience as a researcher at the Stanford Synchrotron Radiation Lab (SSRL) has given him great insights on in situ and in operando characterization techniques. In particular, Dr. Sanchez led the first set of surface and chemically-sensitive in operando measurements on a working fuel cell through the use of Ambient Pressure X-ray Photoelectron Spectroscopy (APXPS). Dr. Sanchez also applied this expertise to study water splitting for artificial photosynthesis as a part of the Joint Center for Artificial Photosynthesis (JCAP), a Department of Energy (DOE) Innovations Hub involving the Lawrence Berkeley National Laboratory (LNBL), the California Institute of Technology (CalTech) and SSRL.

Dr. Sanchez is also well versed in a variety of characterization techniques such as XAS/XES, AFM, SEM, XRD, NMR and mass spectrometry, as well as performance-testing techniques like voltammetry, amperometry and other electrochemistry techniques.

On the synthesis side, Dr. Sanchez is knowledgeable in both hydrothermal and solution synthesis of macro, meso, and nanostructured materials. Dr. Sanchez is especially experienced in the synthesis of carbon-metal composite nanomaterials on either graphene or carbon nanotubes for battery and capacitor applications, but his background also includes traditional organic synthesis.

Since joining Exponent, Dr. Sanchez has also applied his expertise to the characterization and failure analysis of wearable and consumer electronics through techniques such as X-ray computed tomography (CT scanning) and EDS spectroscopy.

CREDENTIALS & PROFESSIONAL HONORS

  • Ph.D., Chemistry, Stanford University, 2014
  • B.S., Chemistry, Haverford College, 2008, honors
  • Phi-Beta-Kappa, 2008

    Phi-Beta-Kappa Northern California Association Graduate Scholarship, 2014

    The American Institute of Chemists Foundation student Award, 2008

LANGUAGES

  • Spanish
  • French
  • Portuguese

Publications

Sanchez Casalongue HG, Benck JD, Tsai C, Karlsson R, Kaya S, Ng ML, Pettersson L, Abild-Pedersen F, Nørskov JK, Ogasawara H, Jaramillo TF, Nilsson A. Operando characterization of an amorphous molybdenum sulfide nanoparticle catalyst during the hydrogen evolution reaction. Journal of Physical Chemistry C 2014; in press. DOI: 10.1021/jp505394e

Sanchez Casalongue HG, Ng ML, Kaya S, Friebel D, Ogasawara H, Nilsson A. In situ observation of surface species on iridium oxide nanoparticles during the oxygen evolution reaction. Angewandte Chemie International Edition 2014; 53:7169–7172.

Miller DJ, Sanchez Casalongue HG, Bluhm H, Ogasawara H, Nilsson A, Kaya S. Different reactivity of the various platinum oxides and chemisorbed oxygen in CO oxidation on Pt(111). Journal of the American Chemical Society 2014; 136(17):6340–6347.

Sanchez Casalongue HG, Kaya S, Viswanathan V, Miller DJ, Friebel D, Hansen HA, Nørskov JK, Nilsson A, Ogasawara H. Direct observation of the oxygenated species during oxygen reduction reaction on a Pt fuel cell cathode. Nature Communications 2013; 4:2817.

Friebel D, Bajdich M, Yeo BS, Louie MW, Miller DJ, Sanchez Casalongue HG, Mbuga F, Weng TC, Nordlund D, Sokaras D, Alonso-Mori R, Bell AT, Nilsson A. On the chemical state of Co oxide electrocatalysts during alkaline water splitting. Physical Chemistry Chemical Physics 2013; 15(40):17460–17467.

Kaya S, Ogasawara H, Näslund LÅ, Forsell JO, Sanchez Casalongue HG, Miller DJ, Nilsson A. Ambient-pressure photoelectron spectroscopy for heterogeneous catalysis and electrochemistry. Catalysis Today 2013; 205:101-105.

Miller DJ, Öberg, H., Kaya S, Sanchez Casalongue HG, Friebel D, Anniyev T, Ogasawara H, Bluhm H, Pettersson L, Nilsson A. Oxidation of Pt (111) under near-ambient conditions. Physical Review Letters 2011; 107(19):195502.

Wang H, Liang Y, Mirfakhrai T, Chen Z, Sanchez Casalongue HG, Dai H. Advanced asymmetrical supercapacitors based on graphene hybrid materials. Nano Research 2011; 4(8):729–736.

Robinson JT, Tabakman SM, Liang Y, Wang H, Sanchez Casalongue HG, Vinh D, Dai H. Ultrasmall reduced graphene oxide with high near-infrared absorbance for photothermal therapy. Journal of the American Chemical Society 2011; 133(17):6825–6831.

Wang H, Yang Y, Liang Y, Cui LF, Sanchez Casalongue H, Li Y, Hong G, Cui Y, Dai H. LiMn1− xFexPO4 nanorods grown on graphene sheets for ultrahigh‐rate‐performance lithium ion batteries. Angewandte Chemie 2011; 123(32):7502–7506.

Tabakman SM, Chen Z, Sanchez Casalongue HG, Wang H, Dai H. A new approach to solution‐phase gold seeding for SERS substrates. Small 2011; 7(4):499–505.

Liang Y, Wang H, Sanchez Casalongue HG, Chen Z, Dai H. TiO2 nanocrystals grown on graphene as advanced photocatalytic hybrid materials. Nano Research 2010; 3(10):701–705.

Wang H, Cui LF, Yang Y, Sanchez Casalongue HG, Robinson JT, Liang Y, Cui Y, Dai H. Mn3O4− graphene hybrid as a high-capacity anode material for lithium ion batteries. Journal of the American Chemical Society, 2010, 132(40), 13978-13980.

Wang H, Sanchez Casalongue HG, Liang Y, Dai H. Ni (OH) 2 nanoplates grown on graphene as advanced electrochemical pseudocapacitor materials. Journal of the American Chemical Society 2010; 132(21):7472–7477.

Li X, Wang H, Robinson JT, Sanchez Casalongue HG, Diankov G, Dai H. Simultaneous nitrogen doping and reduction of graphene oxide. Journal of the American Chemical Society 2009; 131(43):15939–15944.

Sanchez Casalongue HG, Choyke SJ, Narducci Sarjeant A, Schrier J, Norquist AJ. Charge density matching in templated molybdates. Journal of Solid State Chemistry 2009; 182(6):1297–1303.

Hubbard DJ, Johnston AR, Sanchez Casalongue HG, Sarjeant AN, Norquist AJ. Synthetic approaches for noncentrosymmetric molybdates. Inorganic Chemistry 2008; 47(19):8518–8525.

Posters and Presentations

Sanchez Casalongue HG. APXPS studies on electrochemical water splitting. Oral presentation, 248th ACS Meeting, San Francisco, CA, Aug 2014, Abstract # 302.

Sanchez Casalongue HG. DOE site review for Joint Center for Artificial Photosynthesis, Poster Presentation, April 2013, April 2014.

Sanchez Casalongue HG. Ambient pressure XPS studies on electrochemical reactions. Oral presentation, SLAC National Accelerator Laboratory User’s meeting, October 2013.

Sanchez Casalongue HG. Poster presentation, Future of Catalysis Symposium, SLAC National Accelerator Laboratory, September 2012. Best poster presentation award.

Sanchez Casalongue HG. Poster Presentations, SLAC National Accelerator Laboratory User’s meeting 2011–2013.

Sanchez Casalongue HG. In-operando study of PEM fuel cells using ambient pressure photoemission. Oral presentation, 221st ECS Meeting, Seattle, WA, May 2012. Abstract # 1575.

Prior Experience

Graduate Student Research Assistant, SLAC National Laboratory, 2010–2014

Graduate Student Research Assistant, Stanford University, 2008–2010

Undergraduate Researcher, Haverford College, 2004–2007

CREDENTIALS & PROFESSIONAL HONORS

  • Ph.D., Chemistry, Stanford University, 2014
  • B.S., Chemistry, Haverford College, 2008, honors
  • Phi-Beta-Kappa, 2008

    Phi-Beta-Kappa Northern California Association Graduate Scholarship, 2014

    The American Institute of Chemists Foundation student Award, 2008

LANGUAGES

  • Spanish
  • French
  • Portuguese