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Surface atomic concentration of different types of nitrogen in Co-PPy-TsOH/C catalysts prepared from various cobalt precursors
| Cobalt precursor | Pyridinic-N | Pyrrolic-N | Graphitic-N | Oxidized-N |
|---|---|---|---|---|
| Cobalt acetate |
0.308 |
0.225 |
0.279 |
0.188 |
| Cobalt nitrate |
0.297 |
0.204 |
0.293 |
0.207 |
| Cobalt oxalate |
0.345 |
0.305 |
0.197 |
0.153 |
| Cobalt chloride | 0.355 | 0.311 | 0.175 | 0.159 |
