In-situ Differential Electrochemical Mass Spectrometry (DEMS) for Electrocatalytic Reactions

In-situ Differential Electrochemical Mass Spectrometry (DEMS) for Electrocatalytic Reactions

Introduction

This Differential Electrochemical Mass Spectrometry System is an advanced in-situ/operando DEMS platform designed for electrocatalysis research. By combining electrochemical measurement with mass spectrometry, the system enables real-time detection of gaseous and volatile reaction products generated near the electrode surface. It uses membrane inlet sampling near the electrode surface together with capillary sampling at the headspace, allowing fast response, high sensitivity, and synchronized EC-MS data collection. The QAS 100 is well suited for studying reaction pathways, product distribution, catalyst activity, and electrochemical stability across a wide range of electrocatalytic applications

Field-axis technology

One of the most important factors in the performance of a mass spectrometer is the transmission of the ions from the ion source into the mass filter. With the aid of field-axis technology, the ions are able to cross the peripheral fields of the separating system without any noteworthy interaction. This enables a high level of sensitivity (A/hPa) to be achieved without the need for pre and post filters.

Key Features

• Differential electrochemical mass spectrometry for in-situ electrocatalytic analysis
• Fast response time of less than 1 second
• Low detection limit down to 3 × 10^-15 mbar
• Membrane inlet + headspace capillary sampling design for efficient product detection
• Supports various electrochemical cells for different applications
• Synchronized EC-MS data acquisition and plotting software
• Field-axis technology for high ion transmission and high sensitivity without pre- and post-filters
• Compatible with classic DEMS cell, probe-type DEMS cell, and single thin-layer flow electrochemical cell

In-situ DEMS Cell — Classic DEMS Cell

• Stationary or flow cell
• Small electrolyte volume (< 1 mL), especially suitable for isotope labeling experiments
• High collection efficiency (> 95%) and high sensitivity
• Fast response time (< 1 s)
• Unique gold film sputtering technology
• Suitable for photocatalytic and photo-electrocatalytic reactions

In-situ DEMS Cell — Probe-type DEMS Cell

• Stationary or flow cell
• High collection efficiency and high sensitivity
• Especially suitable for single crystal electrodes
• Suitable to couple with surface-enhanced infrared spectrometer

In-situ DEMS Cell — Single Thin-Layer Flow Electrochemical Cell

• High collection efficiency and high sensitivity
• Half cells with separated chambers to avoid interference from the CE electrode
• Suitable for supported catalysts on carbon paper and metal foams

Technical Specifications