研究目的
To thoroughly revisit the photoelectrochemical water splitting process based on energy diagram analysis to elucidate experimental observations, including pH effects and potential distributions.
研究成果
The energy diagram analysis provides a comprehensive understanding of PEC water splitting, explaining pH-dependent and independent behaviors of turn-on potentials. The study successfully correlates experimental I-V characteristics with dynamic band bending under bias, highlighting the role of counter electrode energy lifting in photocurrent initiation. This model integrates electrochemistry and solid-state physics, applicable to other PEC systems for improved design and efficiency.
研究不足
The study is limited to TiO2 nanorods as the model system; other materials may exhibit different behaviors. Hysteresis in cyclic I-V measurements complicates VOC determination. The model assumes negligible potential drops in certain regions, which may not hold for all systems. pH effects are explained but not fully quantified for all conditions.
1：Experimental Design and Method Selection:
The study uses TiO2 nanorods as a model photoanode due to stability in various pH electrolytes. Energy diagrams are constructed with vacuum level as reference, and I-V characteristics are measured in three-electrode and two-electrode configurations under dark and light conditions.
2：Sample Selection and Data Sources:
TiO2 nanorods are synthesized on FTO glass substrates via hydrothermal method with growth times of 2, 4, 8, and 12 hours. Electrolytes include H2SO4 (pH=2), NaCl (pH=7), and NaOH (pH=13).
3：3).
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment includes FE-SEM (JSM700F, JEOL) for morphology, Autolab (PGSTAT128N, Metrohm Autolab Instrument) for PEC measurements, solar simulator with 150 W Xenon lamp for illumination. Materials include FTO glass, HCl, titanium butoxide, NaOH, NaCl, H2SO4, Pt plate, glassy carbon stick, and SCE reference electrode.
4：Experimental Procedures and Operational Workflow:
TiO2 nanorods are synthesized hydrothermally, annealed, and characterized. PEC measurements are performed with varying biases, electrolytes, and light conditions. Potentials (UWR, UWC, UCR) and photocurrents are recorded.
5：Data Analysis Methods:
Data is analyzed using Mott-Schottky measurements, extrapolation of photocurrent curves for turn-on potentials, and correlation with energy band diagrams. Statistical analysis includes pH effect calculations and potential distributions.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
