. 2018 Feb 27;11(3):340. doi: 10.3390/ma11030340

Table 1.

Reduction efficiency of different metal/acid systems and our method.

Reduction Method	Raman (ID/IG)	H (%)	Reference
Mg/HCl	1.52	10.3	[38]
Fe/HCl	1.38	9.8	[35]
Zn/HCl	1.49	29.6	[36]
Al/HCl	1.32	7.2	[38]
NH₃BH₃/Fe₂O₃	1.19	43.6	this paper