1：Experimental Design and Method Selection:

The study employed gradient centrifugation with controllable introduction of isopropanol as a poor solvent to separate non-uniform AIZS QDs into five individual samples. ECL tests were then performed on these samples to screen for high-quality photocatalysts.

2：Sample Selection and Data Sources:

Crude AIZS QDs were synthesized via a hydrothermal method and separated into five fractions (AIZS-#1 to AIZS-#5) using gradient centrifugation.

3：List of Experimental Equipment and Materials:

A Cary 8450 for UV?vis absorption spectra, a Cary Eclipse fluorescence spectrophotometer for PL spectra, a PIXcel3D X-ray diffractometer for XRD patterns, a Tecnai G2 F30 S-Twin microscope for TEM images, a ZEN3690 zeta sizer for DLS spectra, and a SECM-ECL multifunctional apparatus for ECL measurements.

4：Experimental Procedures and Operational Workflow:

The crude QDs were separated by gradient centrifugation with isopropanol, followed by ECL testing to identify high-activity components. Photocatalytic hydrogen production tests were conducted to evaluate the performance of the separated QDs.

5：Data Analysis Methods:

The photocatalytic performance was evaluated based on hydrogen production rates, and ECL intensity was used to correlate with surface states and photocatalytic activity.