| 样品 | FWHM | 2Theta | D(nm) |
| MnO2 | 0.39863 | 37.50 | 20.82 |
| Co/MnO2 | 0.45972 | 37.71 | 18.06 |
| Fe/MnO2 | 0.42488 | 37.59 | 19.54 |
| Cu/MnO2 | 0.43391 | 37.62 | 19.13 |