| Full text | |
| Author(s): |
Rodriguez-Gutierrez, Ingrid
;
Peregrino, Lizandra R. P.
;
Bedin, Karen C.
;
Morishita, Gustavo M.
;
Morais, Gabriel H.
;
Castro, Ricardo H. R.
;
Leite, Edson R.
;
Souza, Flavio L.
Total Authors: 8
|
| Document type: | Journal article |
| Source: | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY; v. 58, p. 11-pg., 2024-01-31. |
| Abstract | |
Scaling up photoelectrochemical (PEC) devices for green hydrogen production is a significant challenge that requires robust and cost-effective production methods. In this study, hematite photoelectrodes has been synthesized using a cost-effective polymeric precursor solution, resulting in homogeneous ultra-thin films (similar to 125 nm) with areas up to 200 cm(2). We observed a substantial photocurrent drop as photoelectrode area increases, addressed by modifying the precursor solution with Hf4+. This modification improves the morphology and films adherence, leading to simultaneous grain vertical bar grain interface segregation and a modified FTO vertical bar hematite interface. As a result, film conductivity increases, reducing the photocurrent drop at larger photoelectrode areas. The improved charge separation and surface charge injection efficiencies allows a homogeneous photocurrent of 1.6 mA cm(-2) at 1.45V across a 15.75 m(2) electrode area, using less than 70 mu g of photoactive material. Cost analysis study indicates that this low-energy fabrication method is a significant step forward in green hydrogen production, contributing to sustainable and efficient green hydrogen technologies. (AU) | |
| FAPESP's process: | 19/06654-9 - Incorporation of metallic nanoparticles in hematite photoelectrodes: effect of solid-solid interface on optical and electrical properties |
| Grantee: | Ingrid Guadalupe Rodriguez Gutierrez |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 21/07459-5 - Control of electronic properties of columnar hematite nanostructure by double transition elements insertion for photoelectrocatalitic water splitting |
| Grantee: | Karen Cristina Bedin |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 17/02317-2 - Interfaces in materials: electronic, magnetic, structural and transport properties |
| Grantee: | Adalberto Fazzio |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 17/11986-5 - Generation and storage of New Energy: bringing technological development for the country |
| Grantee: | Ana Flávia Nogueira |
| Support Opportunities: | Research Grants - Research Centers in Engineering Program |