DEMS System Differential Electrochemical Mass Spectrometry

Bench-top Mass Spectrometer for Electrochemistry – DEMS System Differential Electrochemical Mass Spectrometry is a technique that allows unique online analysis of gaseous and volatile products from electrochemical reactions. The Hiden DEMS system combines advanced electrochemical half cells with excellent performance in mass spectrometry to achieve outstanding analytical capabilities. Key Features  Compact bench-top mass spectrometer system  Mass scanning, and time/intensity trend monitoring of multiple species  Modular, user configurable system including DEMS cell  Fast response (< 1 second),...

DEMS Cells Electrode Electrode clamp 1/16”OD tube connectors (x4) Cell body Electrode body Electrode seal Carrier seal Body seal Membrane position KF-25 support Type B DEMS cell The Type B DEMS cell was designed in collaboration with E. Clark and A. Bell from UC Berkeley. The design optimises electrode configuration, electrolyte flow and membrane position for optimum analyses of electrochemical reactions. The lower chamber houses the membrane inlet to the MS, while the upper chamber contains the working and counter electrode, separated by an ion-conducting membrane. An additional port within...

Type A DEMS cell for materials/catalysis studies Type B DEMS cell for electrochemical reaction studies Counter Electrode Compartment Ion Conducting Membrane Electrolyte inlet Electrolyte outlet Working Electrode Electrolyte Nanoporous Membrane Inlet MS Electrolyte inlet Electrode Electrolyte outlet Nanoporous Membrane Inlet MS

Total Current Density (mA/cm2) Ethanol Current Density (mA/cm2) Methane Current Density (mA/cm2) Example data Ethene Current Density (mA/cm2) Hydrogen Current Density (mA/cm2) DEMS results obtained for CO2-sparged 0.05 M K2CO3 electrolyte (pH = 6.8) with an electrolyte flow rate of 1 mL/min and a scan rate of 0.2 mV/s. Further details are included in the ACS publication. E. L. Clark, M. R. Singh, Y. Kwon, and A. T. Bell (2015) ‘Differential Electrochemical Mass Spectrometer Cell Design for Online Quantification of Products Produced during Electrochemical Reduction of CO2’ Anal. Chem., 87 (15),...

Hiden’s quadrupole mass spectrometer systems address a broad application range in: GAS ANALYSIS dynamic measurement of reaction gas streams catalysis and thermal analysis molecular beam studies dissolved species probes fermentation, environmental and ecological studies SURFACE ANALYSIS UHV TPD SIMS end point detection in ion beam etch elemental imaging – 3D mapping PLASMA DIAGNOSTICS plasma source characterisation etch and deposition process reaction kinetic studies analysis of neutral and radical species VACUUM ANALYSIS partial pressure measurement and control of process gases reactive sputter...