Details

Autor(en) / Beteiligte

• Anjum, Mohsin Ali Raza
• Okyay, Mahmut Sait
• Kim, Minkyung
• Lee, Min Hee
• Park, Noejung
• Lee, Jae Sung

Titel

Bifunctional sulfur-doped cobalt phosphide electrocatalyst outperforms all-noble-metal electrocatalysts in alkaline electrolyzer for overall water splitting

Ist Teil von

• Nano energy, 2018-11, Vol.53, p.286-295

Ort / Verlag

Elsevier Ltd

Erscheinungsjahr

2018

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Sulfur-doped CoP (S:CoP) nanoparticles are synthesized as a noble metal-free electrocatalyst via a novel and eco-friendly thiourea-phosphate-assisted solvothermal route. When used as a bifunctional electrocatalyst for the hydrogen and oxygen evolution reactions from water splitting in an alkaline solution, the electrode exhibits excellent activity and stability outperforming noble mental-based Pt/C, IrO2, and reported non-noble metal-based electrocatalysts. Density functional theory calculations indicate that the excellent performance is attributable to the improved charge-transfer characteristics of the S:CoP nanoparticles owing to their modified electronic structure. It also increases the number of exposed active sites especially on the conductive substrates. A bifunctional S:CoP catalyst-based alkaline electrolyzer for overall water splitting exhibits a stable current density of 100 mA/cm2 at an overvoltage of 0.55 V during a long-term operation; this performance is superior to that obtained from all-noble metal electrolyzer with a Pt/C cathode and an IrO2 anode. The electronic properties of CoP are modulated by doping S into its structure through an environment-friendly thiourea-phosphate route, and produced S:CoP electrocatalysts efficiently catalyze both HER and OER in alkaline media. [Display omitted] •S:CoP is synthesized by eco-friendly thiourea-phosphate-assisted solvothermal route.•S:CoP/NF becomes an active and stable bifunctional water splitting electrocatalyst.•S-doping improves charge transfer and increases density of active sites.•An alkaline electrolyzer with bifunctional S:CoP outperforms all-noble-metal electrolyzer.