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李亚飞教授和兰亚乾教授课题组在ACS ENERGY LETTERS发表研究论文

发布时间:17-07-02 12:56:49 文章来源:1 浏览次数: [ 字号:


CoV2O6-V2O5 Coupled with Porous N-Doped Reduced Graphene Oxide Composite as a Highly Efficient Electrocatalyst for Oxygen Evolution
Shen, FC (Shen, Feng-Cui)[ 1,2,3 ] ; Wang, Y (Wang, Yu)[ 1 ] ; Tang, YJ (Tang, Yu-Jia)[ 1 ] ; Li, SL (Li, Shun-Li)[ 1 ] ; Wang, YR (Wang, Yi-Rong)[ 1 ] ; Dong, LZ (Dong, Long-Zhang)[ 1 ] ; Li, YF (Li, Ya-Fei)[ 1 ]*(李亚飞); Xu, Y (Xu, Yan)[ 3 ] ; Lan, YQ (Lan, Ya-Qian)[ 1 ]*(兰亚乾)

[ 1 ] Nanjing Normal Univ, Sch Chem & Mat Sci, Jiangsu Key Lab Biofunct Mat, Nanjing 210023, Jiangsu, Peoples R China
[ 2 ] Anhui Polytech Univ, Dept Biol & Chem Engn, Wuhu 241000, Peoples R China
[ 3 ] Nanjing Tech Univ, Coll Chem & Chem Engn, State Key Lab Mat Oriented Chem Engn, Nanjing 210009, Peoples R China

ACS ENERGY LETTERS,201706,2(6), 1327-1333

Electrocatalysts with high intrinsic activity for the oxygen evolution reaction (OER) are greatly desired for sustainable oxygen-based electrochemical energy conversion. In this work, the bimetallic oxide composite consisting of CoV2O6 and V2O5 anchoring on nitrogen-doped reduced graphene oxide (CoV2O6 V2O5/NRGO-1) was synthesized directly by carbonization of the polyoxometalates, ethylenediamine, and graphene oxide precursors. CoV2O6-V2O5/NRGO-1 used as an electrocatalyst exhibits an ultralow overpotential of 239 mV vs RHE at the current density of 10 mA cm(-2) and excellent stability in 1 M KOH. Surprisingly, it has high intrinsic activity with the turnover frequency of 1.80 s(-1) at the overpotential of 300 mV, which is the highest among the electrocatalysts reported to date. Theoretical calculation proves that the outstanding electrocatalytic performance is attributed to synergistic effects, in which CoV(2)o(6) acts as active sites while the hydrogen bond between V2O5 and intermediate HOO* of the OER greatly decreases the composite adsorption energy, thus reducing the overpotential. Most importantly, the results demonstrate for the first time that intermolecular hydrogen bonding plays a key role in improving electrocatalytic properties for the OER, which reveals a new method of designing novel OER electrocatalysts.


文章链接:
http://pubs.acs.org/doi/abs/10.1021/acsenergylett.7b00229
 


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