[1] Carnegie Mellon Univ, Wilton E Scott Inst Energy Innovat, Pittsburgh, PA 15213 USA
[2] Carnegie Mellon Univ, Wilton E Scott Inst Energy Innovat, Pittsburgh, PA 15213 USA
[3] Hamerschlag Univ, Pittsburgh, PA USA
[4] Carnegie Mellon Univ, Engn, Pittsburgh, PA USA