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Co–Fe Bimetal Phosphate Composite Loaded on Reduced Graphene Oxide for Oxygen Evolution
Guoxing Zhu,Xulan Xie,Lisong Xiao,Xiaoyun Li,Xiaoping Shen,Yuanjun Liu 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.1
Development of high-performance nonprecious metal-based catalysts for oxygen evolution reaction (OER) is crucial to improve the efficiency of water electrolysis and photoelectrochemical water splitting for harvesting and storage of solar energy. Herein, Co–Fe phosphates and their composites with reduced graphene oxide (rGO) were prepared by a simple hydrothermal method, which then acted as oxygen evolution reaction catalysts. In 1.0 M KOH aqueous solution, the as-obtained optimal composite, Co–Fe phosphate/rGO, can catalyze oxygen evolution reaction with a very sharp onset potential and a small over-potential of 338 mV to achieve a current density of 10 mA cm -2. It was found that in these Co–Fe phosphates, the optimal Co:Fe ratio is 0.75:0.25. The excellent electrocatalytic performance of the Co–Fe phosphate/rGO composite would benefit from the synergistic effects between Fe and Co species, as well as rGO substrate providing conductive channels. The formed Co–Fe phosphate/rGO electrocatalysts can be the promising replacement of precious metal-based catalysts for more practical and cost-efficient water splitting.
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Yee Hwa Sehlleier,Sascha Dobrowolny,Lisong Xiao,Angelika Heinzel,Christof Schulz,Hartmut Wiggers 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.52 No.-
The processing towards Si/C composites, components and synthesis parameters were selected based onthe concept of Hansen solubility parameters (HSP). Si/polymer composites were generated throughmodified bulk polymerization and subsequent pyrolysis transformed the polymer into the desired porouscarbon matrix. Coulombic efficiencies (CE) in excess of 76% after thefirst cycle and 99.95% after solidelectrolyte interphase (SEI) formation have been achieved. A notably high specific delithiation capacity ofaround 1600 mAh/g with an extremely stable cycling performance even after 400 cycles is obtained. Thisscalable and economical synthesis approach is readily applicable to the commercial production of anodematerials.
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