Top 20 most used keywords for ion exchange membranes.
| Keyword | Number of articles | Percentage (%) | Rank |
|---|---|---|---|
| Fuel cell | 1386 | 9.86 | 1 |
| PEMFC | 824 | 5.86 | 2 |
| Proton exchange membrane | 789 | 5.61 | 3 |
| Proton exchange membrane fuel cell | 743 | 5.29 | 4 |
| Fuel cells | 709 | 5.04 | 5 |
| Proton conductivity | 699 | 4.97 | 6 |
| PEM fuel cell | 575 | 4.09 | 7 |
| Electrodialysis | 504 | 3.59 | 8 |
| Membranes | 369 | 2.63 | 9 |
| Proton exchange membrane fuel cells | 346 | 2.46 | 10 |
| Polymer electrolyte membrane | 326 | 2.32 | 11 |
| Nafion | 325 | 2.31 | 12 |
| Membrane | 323 | 2.30 | 13 |
| Direct methanol fuel cell | 315 | 2.24 | 14 |
| Polymer electrolyte membrane fuel cell | 310 | 2.21 | 15 |
| Anion exchange membrane | 307 | 2.18 | 16 |
| Oxygen reduction reaction | 297 | 2.11 | 17 |
| Gas diffusion layer | 270 | 1.92 | 18 |
| PEM fuel cells | 232 | 1.65 | 19 |
| Durability | 222 | 1.58 | 20 |