Details

Autor(en) / Beteiligte

• Zhang, Yi
• Xu, Jie
• Lv, Lin
• Wang, Aiwu
• Zhang, Baoshun
• Ding, Yigang
• Wang, Chundong

Titel

Electronic engineering of CoSe/FeSe hollow nanospheres for efficient water oxidation

Ist Teil von

• Nanoscale, 2020-05, Vol.12 (18), p.1196-124

Erscheinungsjahr

2020

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• First-row non-precious metal-based catalysts are widely studied and recognized as potential substitutes for precious metal-based catalysts in the oxygen evolution reaction (OER) for hydrogen generation but their application remains challenging. In this study, a unique class of Co-Fe selenide hollow nanospheres (CoSe@FeSe 2 ) is well-designed through a facile hydrothermal method. The in situ formed hybrid composites possess numerous interfaces allowing partial electron transfer via O 2− bridges to optimize the adsorption feature of the reaction intermediates, *OH, *O, and *OOH, on the catalysts. The collected surface valence band spectra evidence the optimization of the intermediate adsorption and active sites. The as-synthesized CoSe@FeSe 2 exhibits excellent OER activity with a low overpotential of 281 mV to drive a current density of 10 mA cm −2 and a low Tafel slope of 34.3 mV dec −1 in an alkaline electrolyte. Additionally, the advanced catalyst also shows super stability with negligible current density decay after 12 h. This work presents a prototype for the fabrication of highly efficient electrocatalysts using an electronic engineering strategy. The advanced OER activity is attributed to the hollow architecture, in which the possessed numerous interfaces allow the electron transfers between CoSe and FeSe 2 via O 2− bridges and downshift the d-band center, endowing fast catalytic kinetics.