Hydrothermal evolution, optical and electrochemical properties of hierarchical porous hematite nanoarchitectures

Table 1 Mesoporous structures of the α-Fe ₂ O ₃ synthesized at different temperatures for 12.0 h (FeCl ₃ /H ₃ BO ₃ /NaOH = 2:3:4)

α-Fe₂O₃ nanoarchitecture	Temperature	Multipoint BET	Total pore volume	Average pore diameter
	(°C)	(m² g⁻¹)	(cm³ g⁻¹)	(nm)
1	120	21.3	3.9 × 10⁻²	7.3
2	150	5.2	2.9 × 10⁻²	22.1
3	180	2.6	2.9 × 10⁻²	44.7
4	210	2.0	2.1 × 10⁻²	40.3