update rfb_dashboard

Changed to footnotes of DOIs for references

docs/user-guide/rfb_dashboard.md

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 # RFB Dashboard
 ## Overview
-Redox flow batteries (RFBs) provide a promising pathway towards low-cost grid-scale energy storage devices. The economic viability of non-aqueous and aqueous redox flow batteries (NAqRFBs and AqRFBs respectively) is highly dependent on electroactive materials, salt, and solvent choices.[[1]](#references) The interactive RFB Dashboard can be used to select redox active materials for use in nonaqueous and aqueous RFBs by displaying individual materials along with regions of economic viability defined by the target battery price and minimum redox active species concentration.[[2]](#references) In addition, the tool provides concentration targets for redox active materials achieving the target battery price. This tool can be used to analyze both experimentally demonstrated materials and simulated families of materials. Reference 2 describes the techno-economic model implemented in the present tool. The default values of all input parameters are assumed to be the median values presented in Ref. 1.
+Redox flow batteries (RFBs) provide a promising pathway towards low-cost grid-scale energy storage devices. The economic viability of non-aqueous and aqueous redox flow batteries (NAqRFBs and AqRFBs respectively) is highly dependent on electroactive materials, salt, and solvent choices.[^1](#references) The interactive RFB Dashboard can be used to select redox active materials for use in nonaqueous and aqueous RFBs by displaying individual materials along with regions of economic viability defined by the target battery price and minimum redox active species concentration.[[2]](#references) In addition, the tool provides concentration targets for redox active materials achieving the target battery price. This tool can be used to analyze both experimentally demonstrated materials and simulated families of materials. Reference 2 describes the techno-economic model implemented in the present tool. The default values of all input parameters are assumed to be the median values presented in Ref. 1.
 
 ## Redox Active Material Design Space
 Redox active materials are defined using three electrochemical properties: molecular weight (g/mol e-), redox potential (V vs. Li/Li+), and active material concentration (mol actives/kg solvent). The molecular weight is defined as the molecular weight of redox active material normalized by the number of electrons transferred. The redox potential is defined as the average potential of electron transfer events that the material undergoes.
@@ -45,5 +45,5 @@ The Target Molality is the minimum concentration achieving the target battery pr
 * Voltage Offset (Aqueous only): Hypothetical counter-electrodes, with which each molecule of interest is paired, are specified by an increment in voltage, called the Voltage Offset. For positive-electrode molecules of interest the potential of the counter-electrode exceeds the hydrogen evolution potential by the magnitude of the Voltage Offset, and for negative-electrode molecules of interest the potential of the counter-electrode is set below the oxygen evolution potential by the magnitude of the Voltage Offset. (V)
 
 ## References
- 1. R. M. Darling, K. G. Gallagher, J. A. Kowalski, S. Ha, and F. R. Brushett, Energy Environ. Sci., 7, 3459-3477 (2014)
- 2. R. Dmello, J. D. Milshtein, F. R. Brushett, and K. C. Smith, Journal of Power Sources, 330, 261-272 (2016)
+ [^1]: 10.1039/c4ee02158d 
+ [^2]: 10.1016/j.jpowsour.2016.08.129