| Texto completo | |
| Autor(es): |
Hasimoto, Leonardo H.
;
Bettini, Jefferson
;
Leite, Edson R.
;
Lima, Renato S.
;
Souza, Joao Batista, Jr.
;
Liu, Lifeng
;
Santhiago, Murilo
Número total de Autores: 7
|
| Tipo de documento: | Artigo Científico |
| Fonte: | ACS APPLIED ENGINEERING MATERIALS; v. 1, n. 2, p. 12-pg., 2022-11-30. |
| Resumo | |
The simple, fast, scalable, and integrative preparation of sustainable electrodes using earth-abundant materials toward energy applications is a long-standing challenge. In this work, we attempted to achieve such features by developing a binary cooperative thermal process using cellulose sheets and molybdenum disulfide (MoS2) toward hydrogen evolution reaction (HER). The thermal process converts cellulose into a highly conductive hydrophobic carbon-based material while generating chemical defects on MoS2. The latter is of fundamental importance to improve the catalytic activity for HER through activating the well-known inert MoS2 basal planes. Thermal desulfurization was confirmed by X-ray photoelectron spectroscopy, Kelvin probe force microscopy, Raman spectroscopy, and energy-dispersive Xray spectroscopy. Interestingly, a desulfurization gradient was observed at the MoS2 particles, where the edges are more defective than the basal planes. The resulting defect-like MoS2 particles are highly active toward HER. In addition, the porosity of paper enables simple filtration of catalysts and the possibility to tune the electrochemically active surface area by simply adding isopropanol before the electrolysis. Finally, we showed an ultrafast coating method using a commercial MoS2 spray on sheets of paper that enables H-2 bubble generation at specific regions of the electrode. The overpotential (eta) positively shifted more than 300 mV when compared with nontreated MoS2, reaching eta = 240 mV to obtain 10 mA cm(-2) of HER current density. (AU) | |
| Processo FAPESP: | 22/00955-0 - Estudo da influência de deformações mecânicas no desempenho de dispositivos esticáveis baseados em MoS2 para aplicação na área de energia |
| Beneficiário: | Leonardo Hideki Hasimoto |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |