Design, Manufacturing, and Characterization of High-Performance Lightweight Bipolar Plates Based on Carbon Nanotube-Exfoliated Graphite Nanoplatelet Hybrid Nanocomposites

Table 1

Control factors and levels.

Factor	Coded symbol	Low (−1)	High (1)	Middle (0)
CNT : xGnP; (weight ratio)	A	20; 20 (CNT) : 80 (xGnP)	80; 80 (CNT) : 20 (xGnP)	50; 50 (CNT) : 50 (xGnP)
Roller rpm	B	90	180	135
No. Pass	C	10	20	15