Details

Autor(en) / Beteiligte

• Shi, Zhengtian
• Qi, Xiangqian
• Zhang, Zhiyuan
• Song, Yingchao
• Zhang, Jianfa
• Guo, Chucai
• Xu, Wei
• Liu, Ken
• Zhu, Zhihong

Titel

Interface engineering of cobalt-sulfide-selenium core-shell nanostructures as bifunctional electrocatalysts toward overall water splitting

Ist Teil von

• Nanoscale, 2021-04, Vol.13 (14), p.689-691

Ort / Verlag

England: Royal Society of Chemistry

Erscheinungsjahr

2021

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The number of active sites and stability of the structure of electrocatalysts are the key factors in the process of overall water splitting. In this paper, cobalt-sulfide-selenium (Se:CoS 2− x ) core-shell nanostructures are prepared by a simple two-step method, including hydrothermal reaction and chemical vapor deposition. The resulting product exhibits excellent electrochemical performance, owing to the synergistic effects between CoS 2 and CoSe 1− x , as well as the plentiful active sites in the electrode structure. The Se:CoS 2− x material shows a more improved hydrogen evolution reaction activity compared to CoS 2 and Co(OH)Cl precursor catalysts, with a low overpotential of only 240 mV achieved at 10 mA cm −2 . Meanwhile, Se:CoS 2− x as a bifunctional water splitting catalyst also shows remarkably improved oxygen evolution reaction activity, with a low overpotential of only 1.32 V at 10 mA cm −2 . The above results show that selenide/sulfide materials provide a new research direction for discovering high-performance and cheap electrode materials. We report for the first time that core-shell selenium cobalt disulfide nanotubes are successfully synthesized via a simple two-step method. The Se:CoS 2− x electrode we obtained shows excellent electrocatalytic activity.