When ammonium fluoroborate is excessive, a large number of F atoms are embedded in the carbon material, completely occupying the sites of N and B species, making it difficult for N and B atoms to be embedded in the carbon material
When ammonium fluoroborate is excessive, a large number of F-atoms are embedded in carbon materials, completely occupying the positions of the N and B species, resulting in N and B atoms difficult to embed carbon materials
When ammonium fluoborate is excessive, a large number of F atoms are embedded in carbon materials, occupying the sites of N and B species completely, which makes it difficult for N and B atoms to be embedded in carbon materials<br>