Details

Autor(en) / Beteiligte

• Xu, Qiucheng
• Jiang, Hao
• Zhang, Haoxuan
• Jiang, Haibo
• Li, Chunzhong

Titel

Phosphorus-driven mesoporous Co3O4 nanosheets with tunable oxygen vacancies for the enhanced oxygen evolution reaction

Ist Teil von

• Electrochimica acta, 2018-01, Vol.259, p.962-967

Ort / Verlag

Elsevier Ltd

Erscheinungsjahr

2018

Link zum Volltext

Quelle

ScienceDirect Journals (5 years ago - present)

Beschreibungen/Notizen

• Uniformly and controllably introducing oxygen vacancy (Ov) into spinel electrocatalysts is still a great challenge for the oxygen evolution reaction (OER). Herein, we demonstrate the synthesis of spinel Co3O4 mesoporous nanosheets aggregation with tunable Ov by a simple phosphorus (P) doping strategy. It is found that a trade-off between Ov and electronic conductivity plays an important role in improving OER electrocatalytic activity. The optimized Co3O4-xP0.15 electrocatalyst delivers a current density of 20 mA cm−2 in alkaline media within a small overpotential of only 338 mV, which is much lower than the corresponding Co3O4 (395 mV) and the commercial RuO2 (368 mV) catalysts. The Tafel slope is 52 mV dec−1 and the overpotential gives negligible increase even through 8 h OER at 10 mA cm−2. The superior OER catalytic activity is mainly attributed to the 2D mesoporous nanosheets (rich active sites) and appropriate Ov (fast electrons transfer). This work provides a simple and effective strategy to control Ov concentration in spinel electrocatalysts for enhancing water oxidation capability. [Display omitted] •The oxygen vacancy can be controlled by a P-doping strategy.•The mesoporous Co3O4-xPy nanosheet enriches electrocatalytic active sites.•The optimized Co3O4-xP0.15 catalysts show superior OER activity and durability.