| Keyword | CPC | PCC | Volume | Score | Length of keyword |
|---|---|---|---|---|---|
| international journal of hydrogen energy if | 0.21 | 0.4 | 5692 | 31 | 43 |
| international | 1.47 | 0.4 | 5346 | 33 | 13 |
| journal | 1.53 | 0.5 | 6782 | 20 | 7 |
| of | 1.67 | 0.2 | 2306 | 36 | 2 |
| hydrogen | 1.36 | 0.2 | 1138 | 73 | 8 |
| energy | 1.45 | 0.8 | 4069 | 25 | 6 |
| if | 0.67 | 0.4 | 2186 | 69 | 2 |
