Dr. Ripatti specializes in the design and failure analysis of electrochemical systems, such as fuel cells, electrolyzers and sensors. His background encompasses microfluidics, heterogeneous catalysis, surface science, ion conducting polymers, porous materials and organometallic synthesis. Dr. Ripatti is versed in a variety of characterization techniques which includes impedance spectroscopy, scanning electron microscopy, computed 3D x-ray tomography, scanning 3D laser profilometry, x-ray photoelectron spectroscopy, gas chromatography, mass spectroscopy and nuclear magnetic resonance. The interdisciplinary nature of his background positions Dr. Ripatti to solve complex problems in a variety of industries including, consumer products, medical devices, water treatment and gas phase sensor technology.
Prior to joining Exponent, Dr. Ripatti was a graduate student in the Stanford Chemistry Department. His research focused on designing, fabricating and evaluating carbon monoxide electrolysis devices for the production of concentrated chemical product streams. As a result, Dr. Ripatti has extensive experience related to fabrication techniques such as laser engraving metals, physical vapor deposition, electroplating, SLA 3D printing and CNC machining. Optimization of mass transport in these systems is challenging, requiring that electrodes be designed to generate high surface area gas-liquid interfaces in close proximity to conductive catalyst surfaces. Optimization of these electrodes led Dr. Ripatti to develop a novel catalyst spray deposition technique for reproducibly generating high porosity electrodes. In addition to electrochemical system design and fabrication, Dr. Ripatti also has experience with the synthesis and characterization of nano-crystalline metallic materials.
Prior to Stanford, Dr. Ripatti was a DAAD scholar at the University of Erlangen-Nuremberg working on the synthesis and isolation of reactive organo-uranium complexes to further our fundamental understanding of actinide bonding.
CREDENTIALS & PROFESSIONAL HONORS
- Ph.D., Chemistry, Stanford University, 2019
- B.S., Chemistry, University of California, San Diego, 2013
DAAD Scholar, University of Erlangen-Nuremberg, 2013-2014
US Patent 16/543, 943: Electrochemical Cells and Cathodes for the Production of Concentrated Product Streams from the Reduction of CO and/or CO2, Patent Pending 2019, (Ripatti DS, Kanan MW, Veltman TR).
DAAD Research Scholar, Inorganic Chemistry Department of Erlangen-Nuremberg, 2013-2014