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Table 2 Experimental matrix of central composite design runs using Design Expert 8.0 software

From: Enhanced performance of a novel anodic PdAu/VGCNF catalyst for electro-oxidation in a glycerol fuel cell

Run order no. Factors variables Current density (mA cm−2)
X1:NaOH concentration (M) X2: Temperature (°C) X3: Catalyst loading Actual
1 0.5 80 30 115.89
2 3.25 6.25 20 35.89
3 3.25 52.5 20 160.7
4 0.1 52.5 20 113
5 6 25 10 75.62
6 3.25 52.5 6.25 32.33
7 3.25 98.74 20 105.05
8 3.25 52.5 20 150.98
9 0.5 25 10 38.62
10 6 25 30 90
11 6 80 10 101.1
12 3.25 52.5 36 68.98
13 0.5 80 10 110.65
14 6 80 30 119.56
15 3.25 52.5 20 159.7
16 3.25 52.5 20 152.69
17 7.87 52.5 20 164
18 3.25 52.5 20 158.9
19 0.5 25 30 60
20 3.25 52.5 20 163.25