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Research Article

Microbial Community Analysis of a Methane-Producing Biocathode in a Bioelectrochemical System

Table 1

Overview of the operational parameters, inoculum, and performance of methane-producing biocathodes that use CO₂ as electron acceptor.


Microbial catalysts	Operational mode	Applied voltage^a	Current density^b	Methane production rate^c	Reference
Microbial catalysts	Operational mode	(V (versus NHE))	(A/m²)	(L/m² cathode per day)	Reference

Defined enriched cultures—dominant microbe Methanobacterium palustre	Two-chamber, batch-fed	−0.8 V _cat	1.8	4.5	[13]
Methanobacterium palustre ATCC BAA-1077	Two-chamber, batch-fed	−0.8 V _cat	0.07	0.26	[13]
Undefined enriched cultures	Single-chamber, batch-fed	−0.807 V _cell	nr	nr	[15]
Undefined enriched cultures	Single-chamber, continuously-fed	−0.813 V _cell	nr	nr	[15]
Undefined enriched cultures	Two-chamber, batch-fed	−0.9 V _cat	2.9	9.2	[21]
Undefined enriched cultures	Single-chamber, continuously-fed	−0.9 V _cell	5.8	1.8	[16]
Undefined enriched cultures	Two-chamber, continuously-fed	−1.4 V _cat	4.1	8.7	[14]
Undefined mixed cultures	Two-chamber, continuously-fed	−0.7 V _cat	0.87	1.4	[17]
Undefined mixed cultures	Two-chamber, continuously-fed	−0.55 V _cat	0.21	0.12	[17]
Defined enriched cultures—dominant microbe Methanobacterium sp.	Two-chamber, batch-fed	−0.59 V _cat	nr	nr	[8]
Undefined mixed cultures	Single-chamber, batch-fed	−1.25 V _cell	nr	10	[48]
Undefined mixed cultures	Two-chamber, continuously-fed	−0.93 V _cat	0.10	0.24	[40]
Undefined enriched cultures	Two-chamber, batch-fed	−1.15 V _cat	15	24	[41]
Methanobacterium thermoautotrophicus	Single-chamber, batch-fed	−1.5 V _cell	nr	1.0	[49]
Defined mixed cultures—dominant microbe Methanobacterium sp.	Two-chamber, batch-fed	−0.7 V _cat	1.6	4.1	This study
Defined mixed cultures—dominant microbe Methanobacterium sp.	Two-chamber, batch-fed	−0.6 V _cat	0.9	2.3	This study

Applied cathode potential (versus NHE) or applied cell voltage when the cathode potential was not reported.
^bCalculated using the projected cathode surface area.
^cCalculated at standard temperature and pressure (273.15 K and 1 atm) using the projected cathode surface area.
nr: not reported.