1：Experimental Design and Method Selection:

A one-pot hydrothermal method without fluorion assistance was used to create a novel peanut-like (PN) anatase TiO2 microstructure. Diethylenetriamine was introduced as a shape controlling agent, and a two-phase interface was created by the etherification reaction of isopropyl alcohol.

2：Sample Selection and Data Sources:

Anatase PN TiO2 microarchitecture consisted with ultrathin nanosheets was fabricated. The samples were characterized by SEM, TEM, XRD, XPS, UV-Vis spectrometer, and Mott-Schottky measurements.

3：List of Experimental Equipment and Materials:

Field emission scanning electron microscopy (SEM, S4800 HSD, Hitachi), transmission electron microscope (TEM, Tecnai G2 F20, FEI), X-ray diffractometer (XRD-6000, Shimadzu), X-ray photoelectron spectroscopy (XPS, Perkin-Elmer, PHI 5400 ESCA system), UV-Vis spectrometer (TU1901, Beijing Purkinje), and a 150 W xenon lamp class ABB solar simulator (94021A, Newport, USA).

4：Experimental Procedures and Operational Workflow:

The synthesis of PN TiO2 involved adding DETA into isopropyl alcohol, dropwising isopropyl titanate into the solution, transferring the mixture to a Teflon-lined autoclave, and calcining the product. DSSCs were fabricated with screen-printing method, and their photovoltaic properties were measured.

5：Data Analysis Methods:

The data were analyzed using SEM, TEM, XRD, XPS, UV-Vis spectrometer, and Mott-Schottky measurements. The photovoltaic properties including J-V, EIS, OCVD were recorded with VersaSTAT electrochemical workstation.