1：Experimental Design and Method Selection:

A two-step method was used to synthesize CoTe2@NCNTs hybrids using ZIF-67 as a template. The first step involved annealing ZIF-67 in the presence of H2 to generate Co@NCNTs precursors. The second step involved tellurization of Co@NCNTs precursors to form CoTe2@NCNTs.

2：Sample Selection and Data Sources:

ZIF-67 polyhedrons were synthesized by a coprecipitation method.

3：List of Experimental Equipment and Materials:

Field-emission scanning electron microscope (FE-SEM, HITACHI S-4800), transmission electron microscope (TEM, FEI Tecnai G2 F20), X'Pert PRO powder X-ray diffractometer, Renishaw micro-Raman system, ESCALAB 250 system for XPS, Autosorb-iQ analyzer for specific surface area, CHI760E electrochemical workstation, XM-500W standard solar simulator.

4：Experimental Procedures and Operational Workflow:

The synthesis process involved annealing ZIF-67 in a mixed H2/Ar flow to form Co@NCNTs, followed by tellurization to form CoTe2@NCNTs. The materials were characterized using various techniques, and their performance as CEs in DSSCs was evaluated.

5：Data Analysis Methods:

The performance of the DSSCs was evaluated using photocurrent–voltage (J–V) characteristics, cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and Tafel polarization curves.