期刊
NANO LETTERS
卷 14, 期 1, 页码 158-165出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl403674a
关键词
Energy storage; redox flow battery; catalysts; electrode; vanadium; nanorod
类别
资金
- U.S. Department of Energy's (DOE) Office of Electricity Delivery and Energy Reliability (OE) [57558]
- DOE's Office of Biological and Environmental Research
- DOE [DE-AC05-76RL01830]
A powerful low-cost electrocatalyst, nanorod Nb2O5, is synthesized using the hydrothermal method with monoclinic phases and simultaneously deposited on the surface of a graphite felt (GF) electrode in an all vanadium flow battery (VRB). Cyclic voltammetry (CV) study confirmed that Nb2O5 has catalytic effects toward redox couples of V(II)/V(III) at the negative side and V(IV)/V(V) at the positive side to facilitate the electrochemical kinetics of the vanadium redox reactions. Because of poor conductivity of Nb2O5, the performance of the Nb2O5 loaded electrodes is strongly dependent on the nanosize and uniform distribution of catalysts on GF surfaces. Accordingly, an optimal amount of W-doped Nb2O5 nanorods with minimum agglomeration and improved distribution on GF surfaces are established by adding water-soluble compounds containing tungsten (W) into the precursor solutions. The corresponding energy efficiency is enhanced by similar to 10.7% at high current density (150 mA.cm(-2)) as compared with one without catalysts. Flow battery cyclic performance also demonstrates the excellent stability of the as prepared Nb2O5 catalyst enhanced electrode. These results suggest that Nb2O5-based nanorods, replacing expensive noble metals, uniformly decorating GFs holds great promise as high-performance electrodes for VRB applications.
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