Work

Estimations of the Activation Energies for the Charge Transfers of the Long-Lived Holes at the Semiconductor/Electrolyte Interfaces of α-Fe2O3 and α-Fe2O3/Co–Pi Photoanodes

Year: 2025

Type: article

Abstract: High Resolution Image Download MS PowerPoint Slide Cobalt phosphate (Co–Pi) is an efficient co-catalyst known to enhance charge transfer efficiency and lower activation energy, improving photoelectrochemical (PEC) performance. In this study, we estimated the activation energy for hole transfer at the interface between hematite (α-Fe 2 O 3 ) and Co–Pi. By using a near-field heterodyne transient grating (NF-HD-TG) method, we determined the reaction rate constants for the hole transfer under an applied bias voltage. The activation energy and the pre-exponential factor ( A ) could be extracted from the temperature-dependent rate constants. After the surface treatment with Co–Pi, the activation energy was significantly reduced from 103.8 to 27.5 kJ/mol. Furthermore, the pre-exponential factor also decreased, indicating that the limited Co–Pi deposition may have reduced the overall active surface area for the water oxidation reaction.

Source: The Journal of Physical Chemistry Letters

DOI: 10.1021/acs.jpclett.5c01803

Authors: Seong Kyu Jang, Seung Hyeon Jeong, Aram Hong, Woon Yong Sohn

Institution: Chungbuk National University

Language: English

Topic: Iron oxide chemistry and applications

Subfield: Renewable Energy, Sustainability and the Environment

Field: Energy

Domain: Physical Sciences

SDG: Affordable and clean energy

Open Access status: hybrid

Estimated APC paid: $4,500