French Bio Logic Compact Scanning Electrochemical Microscope

SECMIt is a probe based on microscopy technology, and the measured image contrast can display the local electrochemical activity of the studied surface. Traditional electrochemical testing obtains the average signal of the entire sample surface, while SECM can spatially decompose the electrochemical properties and obtain the local characteristics of the sample. Local characteristics can serve as supplementary information to help users interpret global measurement results.

Bio-LogicThe scanning electrochemical workstations M370 and M470 are relatively comprehensive micro area electrochemical workstations, both of which include SECM modules. The M470 includes a total of 9 modules, namely Scanning Electrochemical Microscopy System (SECM), AC Scanning Electrochemical Microscopy System (ac SECM), Intermittent Contact Scanning Electrochemical Microscopy System (ic SECM), Micro Area Electrochemical Impedance Testing System (LEIS), Scanning Vibration Electrode Testing System (SVET), Electrolyte Droplet Scanning System (SDS), AC Electrolyte Droplet Scanning System (ac SDS), Scanning Kelvin Probe Testing System (SKP), and Non Contact Micro Area Morphology Testing System (OSP). Compared to M470, SECM150 is a new portable, entry-level SECM device.

Figure 1 SECM150 Compact Scanning Electrochemical Microscope

1French Bio Logic Compact Scanning Electrochemical MicroscopeIntroduction

SECM 150It is a scanning system with low price, high resolution (<10 nm), and small size, especially suitable for glove box work due to its small size. The piezoelectric locator is equipped with a capacitive position sensor, which can provide a resolution of 10nm throughout the entire scanning range. The integrated dual potentiostat can measure ultra-low current with a resolution of 6.1 fA.

(1) So compact, suitable for glove boxes!

The laboratory space is often limited, especially when strict air atmosphere control is required for experiments, and there are also strict requirements for the volume and size of experimental instruments. The design of SECM150 is as compact as possible while maintaining high performance. Its weight is only 8kg, and its size is suitable for environments as small as glove boxes. For example, the PU51 potentiostat is only 10cm long and weighs 61g. The size of its scanning table is only 190 * 225 * 230mm. SECM150 is currently the smallest SECM device on the market.

(2) Ultra high resolution<10nm scanning resolution

SECM150The probe position is controlled by three piezoelectric scanning platforms, with a scanning range of 200 * 200 * 100 μ m. The position resolution on each coordinate axis is less than 10nm. Bio Logic Pt ultrafine probes come in many different sizes, smaller than 1 μ m. But SECM150 can be used with smaller probes of any material. The potentiostat has a high current range sensitivity of 100pA and a resolution of 6.1fA. The ultra-high resolution of SECM150 can almost meet all SECM tests.

(3) Quick Scan

During the testing process, SECM150 can scan up to 20 discrete points per second. This rapid scanning instrument can be used to study time variable systems. Its scanning speed can reach 200 μ m/s. For example, Figure 2 shows data from 10000 points measured within 18 minutes.

Figure 2: Gold Sample inK3[Fe(CN)6]Test results in solution

IIFrench Bio Logic Compact Scanning Electrochemical MicroscopeThe application

SECM150 has a wide range of applications and can be used to study electrochemical reactions on material surfaces. Here are some application cases:

(1) Battery

Lithium ion battery: LiCoO₂Li decomposed by paste electrode⁺The spatial heterogeneity.

Lithium ion batteries: Formation and evolution of solid electrolyte interfaces under operating conditions.

Lithium ion batteries: Study on the uniformity of insulation performance of separators.

Lithium air battery: The mass transfer resistance of oxygen on the gas diffusion electrode is determined by collecting oxygen at the tip of the probe.

Redox flow battery: research on current collector passivation.

(2) Corrosion/Coating

Measure the electrochemical properties of particles and phases in metal alloys (inclusions, intermetallic compound particles, grain boundaries, grains).

Study the local corrosion mechanism of metal alloys.

The evolution of uniformity of specific anti-corrosion treatment protection.

(3) Fuel Cells and Photocatalysis

The spatially resolved catalytic performance of catalysts.

Catalyst composition screening.

(4) Biosensors

Test the reactivity of receptors to specific molecules produced by probes.

Use probe immobilization techniques to test locally generated molecules.

(5) Basic electrochemistry

Study on the distribution of electron transfer on conductive substrates.