Redox Flow Batteries Vanadium to Earth Quinones

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Redox Flow Batteries Vanadium to Earth Quinones ( redox-flow-batteries-vanadium-earth-quinones )

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mentioned reaction in absent of diffusion limitations using a rotating disk electrode for this purpose. Here, it can be observed an increasing value from GF (3 x10-5 m/s) < GF@CeO2 (2 x10-5 m/s) < GF@CeO2-x (4 x10-5 m/s). Therefore the partially reduced ceria NPs are capable of a faster kinetic constant, improving the electrochemical performance towards the positive VRFBs redox reaction. 100 rpm 12 500 rpm 1000 rpm 1500 rpm 2000 rpm 2500 rpm E vs. NHE / V 9 6 3 00 GC-CNPs 12 b) 350 300 250 200 150 100 w-1/2 / (rad/s)-1/2 GC-CNPs@CeO2 Kf = 2 x 10-5 m/s 0.1 0.2 0.3 w-1/2 / (rad/s)-1/2 GC-CNPS@CeO2-x 20 16 0.4 100 rpm 200 rpm 500 rpm 1000 rpm 1500 rpm 0.6 0.8 1.0 E vs. NHE / V GC-CNPs@CeO2-x c) 9 6 3 00 0.4 0.1 0.2 0.3 12 2000 rpm 2500 rpm 8 4 Kf = 4.1 x 10-5 m/s 0.2 0.3 100 rpm 500 rpm 1000 rpm 1500 rpm 2000 rpm 2500 rpm GC-CNPs 0.6 0.8 1.0 50 0.0 50 0.0 300 200 100 Kf = 3.2 x 10-5 m/s GC-CNPs@CeO 2 00 0.1 0.4 0.6 0.8 1.0 0.0 a) 300 250 200 150 100 I / mA I / mA I / mA 1/i / A-1 1/i / A-1 1/i / A-1 E vs. NHE / V w-1/2 / (rad/s)-1/2 Figure 6.44. – On the left, rotating disk electrode experiments on several sample deposit onto glassy carbon in 0.5 M VOSO4 1M H2SO4 solution. a) GC-CNPs b) GC- CNPs@CeO2 c) GC-CNPs@CeO2-x. On the right, rotating disk electrode plot for several sample deposit onto glassy carbon as positive electrode to obtain the kinetic constant for: a) GC-CNPs, b) GC-CNPs@CeO2 and c) GC-CNPs@CeO2-x. 139

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