Table 1.

Hydrogen production using cellulose, glucose, or five different volatile acids at an applied voltage of 0.6 V

Substrate	YH2, mol of H2/mol of substrate	RH2, %	Production rate, m3·d−1·m−3	η, %	ηW+S, %
Glucose	8.55	71	1.23	266	64
Cellulose	8.20*	68	0.11	268	63
Acetic acid	3.65	91	1.10	261	82
Butyric acid	8.01	80	0.45	285	77
Lactic acid	5.45	91	1.04	283	82
Propionic acid	6.25	89	0.72	248	79
Valeric acid	8.77	67	0.14	263	66

*Calculated per mole of hexose equivalent.