Solar Energy & Advanced Materials Research Group


New Paper in ACS Catal.

30 November 2021

A new paper by Chaoran Jiang et al. just published in ACS Catalysis.


Our new paper on the investigation of Crystallinity-Modulated Co2–xVxO4 Nanoplates for Efficient Electrochemical Water Oxidation just published in ACS Catal.! Big congratulations to Chaoran!

Cost-efficient and durable oxygen evolution catalysts are in great demand, which are dominated not only by the component of the electrocatalysts but also by their molecular structure and crystallinity. Herein, we developed an efficient cobalt–vanadium spinel-type electrocatalyst with an extremely high concentration of Co3+ ions by tuning the balanced vanadium ions’ concentration in crystallinity-modulated Co2–xVxO4 nanoplates. This resulted in the lowest overpotential of 240 mV at 10 mA/cm2, the smallest Tafel slope of 45 mV dec–1, and a current density of 100 mA/cm2 at an overpotential of 280 mV for water oxidation, which is remarkably 20 times better than that of the benchmark RuO2 catalyst, along with excellent stability. Such excellent performance is due to the very high Co3+/Co2+ ratio of 2.84 achieved in situ in the low-crystallinity Co2–xVxO4 (LC-Co2–xVxO4) sample, which is 40% higher than that of the widely reported Co3O4, as evidenced by both operando X-ray absorption near-edge spectroscopy and in situ X-ray photoelectron spectroscopy. These findings stimulate the opportunities to explore Co2–xVxO4 as a class of nonprecious-metal-based efficient OER electrocatalysts.