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Electrochemical

What Is Atom Probe Tomography?

Electrochemical testing is a method used to evaluate the electrochemical properties of materials and systems by studying their electrical behavior in response to applied voltage or current. This technique is widely used in fields such as battery development, corrosion analysis, fuel cell testing, sensors, and material characterization. Electrochemical methods can provide valuable insights into ionic conductivity, charge transfer processes, electrode behavior, and the stability of materials under different environmental conditions.

In electrochemical testing, materials are typically subjected to specific electrical signals (e.g., voltage, current, or potential) while monitoring changes in current, voltage, or impedance. These measurements help assess the material’s performance, stability, and degradation under operational or extreme conditions.

Key advantages

  • Precise control and measurement of electrochemical reactions

  • Versatile techniques applicable to a wide range of materials, including metals, polymers, composites, and electrolytes

  • Provides insights into corrosion resistance, battery performance, and material degradation

  • Supports real-time monitoring of electrochemical systems, especially in dynamic environments

What Electrochemical Testing Is Used For

Atom Probe is used when you need both:

  • 3D nanoscale distribution (not just 2D)

  • High elemental sensitivity (including minor or trace elements)

Typical questions APT can answer:

  • Where are key elements concentrated in the microstructure?

  • Are impurities or dopants segregating to grain boundaries?

  • What is the chemistry at an interface or thin layer?

  • Are nanoscale precipitates present, and what is their composition?

  • How does processing or heat treatment change element distribution?

Typical Application Scenarios

Electrochemical testing is essential for various industries and applications, including:

Battery Development and Energy Storage

  • Battery performance testing: Measure charge/discharge cycles, capacity, efficiency, and cycle life

  • Electrolyte stability: Assess the stability and conductivity of electrolytes used in batteries

  • Lithium-ion battery testing: Evaluate internal resistance, voltage profiles, and state-of-charge

Corrosion Analysis

  • Corrosion rate measurement: Determine how materials degrade over time when exposed to environmental factors like moisture, temperature, and chemicals

  • Electrochemical impedance spectroscopy (EIS): Measure material’s resistance to corrosion and protective coatings effectiveness

  • Anodic/cathodic polarization: Identify corrosion susceptibility and protective capabilities of coatings

Fuel Cell Testing

  • Fuel cell performance: Evaluate voltage output, current density, and power efficiency

  • Electrode behavior: Assess the catalytic activity and durability of electrodes in fuel cell systems

  • Electrolyte testing: Measure ionic conductivity and chemical stability of the fuel cell electrolyte

Sensors and Electrochemical Devices

  • Electrochemical sensors: Test the sensitivity and response time of sensors used for detecting gases, pH, ions, and other substances

  • Bioelectrochemical systems: Study biosensors, biofuel cells, and other biological electrochemical processes

Material Characterization

  • Conductivity measurement: Assess ionic or electronic conductivity of materials for various applications (e.g., solid-state batteries, fuel cells)

  • Electrode material behavior: Study the charge storage capacity, reactivity, and charge transfer processes in electrode materials

  • Surface chemistry: Examine the interaction between materials and electrochemical environments

Why Electrochemical Testing (vs. Other Methods)?

Compared with traditional physical testing methods:

  • Electrochemical testing provides in-depth information on material performance in environments where chemical reactions and electrochemical processes are significant.

  • Unlike mechanical tests that focus on strength and structural properties, electrochemical testing emphasizes the electronic and ionic behavior of materials.

  • Electrochemical techniques can offer real-time insights into the dynamic processes occurring at the electrode-solution interface during operation.

Compared with optical methods (e.g., microscopy, spectroscopy):

  • Electrochemical testing can provide quantitative data on processes like charge transfer, energy storage, and degradation, which is often more difficult to quantify optically.

  • Electrochemical methods are ideal for dynamic testing in real-world conditions (e.g., battery cycling, fuel cell operation, corrosion exposure) that involve continuous changes in the material’s state.

Types of Electrochemical Tests We Offer

We offer various electrochemical testing techniques, each suited for specific applications:

Potentiostatic and Galvanostatic Testing

Best for: Battery testing, corrosion analysis, fuel cell testing

  • Potentiostatic testing: Applying a constant voltage to a system while monitoring the current response (e.g., battery charge/discharge)

  • Galvanostatic testing: Applying a constant current and measuring the resulting voltage (e.g., corrosion rate, electrolysis)

Electrochemical Impedance Spectroscopy (EIS)

Best for: Corrosion analysis, fuel cell testing, material characterization

  • Measure the impedance of a system over a range of frequencies

  • Provide insights into charge transfer resistance, double-layer capacitance, and material stability

Cyclic Voltammetry (CV)

Best for: Characterizing electrochemical reactions, battery testing

  • Measure the current response to cyclic voltage sweeps, allowing for the analysis of redox reactions, reaction mechanisms, and kinetics

Linear Sweep Voltammetry (LSV)

Best for: Corrosion testing, fuel cell analysis

  • A method used to study electrochemical processes by applying a linear voltage ramp to the system and measuring the resulting current

Chronoamperometry and Chronopotentiometry

Best for: Battery testing, sensor calibration

  • Measure the current response (chronoamperometry) or voltage response (chronopotentiometry) of a system when subjected to step changes in voltage or current.

Electrode Material Testing

Best for: Material characterization, battery electrode performance

  • Characterize electrode behavior during charge/discharge cycles and intercalation/de-intercalation processes

  • Assess electrode stability, conductivity, and energy efficiency

What You Receive

  • Electrochemical test data: Current-voltage plots, impedance spectra, and other data visualizations

  • Analysis report: Key findings, including performance characteristics, failure modes, and efficiency metrics

  • Interpretation of results: Detailed explanation of test results, with an emphasis on product/application relevance

  • Recommendations for improvements: Based on the data, we provide actionable next steps for product optimization or process adjustments (if applicable)

Sample Submission Guidelines

Please provide

  • Sample description and material type (e.g., electrode, battery, coating)

  • Test objectives: Are you testing for performance, stability, or failure modes?

  • Required test parameters (e.g., voltage range, current density, temperature, cycling conditions)

  • Sample form: Flat samples, electrodes, coatings, and electrolyte solutions should be clearly prepared for testing

Packaging tips

  • Use clean, dry containers to avoid contamination (for liquids or pastes)

  • Ensure electrodes or samples are well-protected during transit (avoid mechanical damage)

  • Label samples clearly (e.g., batch ID, treatment method) for accurate testing and comparison

FAQs

Electrochemical testing is applicable to a wide range of materials, including metals, polymers, composites, ceramics, and electrolytes. It is commonly used for battery electrodes, fuel cells, corrosion materials, and coatings.

We typically use potentiostatic testing, cyclic voltammetry (CV), or electrochemical impedance spectroscopy (EIS) to measure the corrosion rate and identify active/passive behavior at the material’s surface.

  • EIS is a frequency-based measurement that evaluates the system’s impedance at different frequencies, providing insights into the resistive and capacitive properties of the system.

  • CV involves sweeping voltage over time and measuring the resulting current to analyze redox reactions and reaction kinetics.

Yes, electrochemical tests can be adapted to small samples, including individual electrodes or micro-sized components, provided there’s sufficient contact for measurement.

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