Beijing Key Laboratory of Environmental Science and Engineering

Beijing, China

Beijing Key Laboratory of Environmental Science and Engineering

Beijing, China
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Li W.,Beijing Institute of Technology | Yao Y.,Beijing Institute of Technology | Yao Y.,Beijing Key Laboratory of Environmental Science and Engineering | Yao Y.,HIGH-TECH | And 6 more authors.
Gaodeng Xuexiao Huaxue Xuebao/Chemical Journal of Chinese Universities | Year: 2017

Carbon fiber ultra-microelectrode was used to study the electrochemical reactions of O2 in dimethyl sulfoxide, acetonitrile and tetraethylene glycol dimethyl ether. The results suggested that in tetrabutyl-ammonium-ion(TBA+)-containing electrolytes, the electrochemical reactions were reversible reactions of one-electron transfer; while in lithium-ion(Li+)-containing electrolyte, multiple-electrons transfer occurred during the oxygen reduction reaction(ORR) and oxygen evolution reaction(OER). Powder microelectrodes of super P and conductive acetylene black were used as working electrodes to conduct electrochemical experiments. The results showed the ORRs were similar, but the OER had differences on these two materials. Besides, Tafel analyses indicated that during the ORR, one-electron transfer always took place at first whether in different non-aqueous solvents or on different cathodes. © 2017, Higher Education Press. All right reserved.


Xie M.,Beijing Key Laboratory of Environmental Science and Engineering | Xie M.,Beijing Institute of Technology | Wang K.,Beijing Key Laboratory of Environmental Science and Engineering | Chen R.,Beijing Key Laboratory of Environmental Science and Engineering | And 5 more authors.
Chemical Research in Chinese Universities | Year: 2015

A high purity sheet-like Na2Ti3O7 material was synthesized by a new facile solid-state method with hollow sphere TiO2 as titanium source. X-Ray diffraction(XRD) measurement proves that no impurity phase existed when the sample was heated at 900 °C. Charge/discharge measurement was performed in a potential range of 0.01–2.5 V at different current-rates(C-rates). The initial charge/discharge capacities are 191/424 mA·h/g at 0.1 C and still remain as high as 101 mA·h/g after 50 cycles. CV test proves that the large irreversible capacity in the initial cycle results from the formation of the solid electrolyte interface(SEI). However, the electrode presents an increased initial coulombic efficiency in a 1 mol/L NaPF6 electrolyte compared to that in a 1 mol/L NaClO4 electrolyte. © 2015, Jilin University, The Editorial Department of Chemical Research in Chinese Universities and Springer-Verlag GmbH.

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