WARNV5Coulombic mass-balance is open on 10/12 sweep points (>5% closure error). Check substrate consumption + Q_measured.· Logan-group hygiene check; mass balance fundamentals
WARNV6Mean CE × OLR = 61.6 exceeds empirical Logan-group envelope (≤25). Mass transport limits CE at high loading; prediction may be optimistic.· Cheng & Logan 2011 — empirical envelope
Reproducing
Cheng S, Liu H, Logan BE (2006) — Environmental Science & Technology
Increased power generation in a continuous flow MFC with advective flow through the porous anode and reduced electrode spacing
p. 2430, Fig. 4 + Table 2 (4 cm → 2 cm spacing reduction)
766
mW/m²
827
mW/m²
+7.9%
green
Coulombic efficiency
acetate + carbon cloth anode + air-cathode, peak CE at MPP
p. 2430
32.0
%
31.1
%
-2.8%
green
COD removal
acetate utilization across the fed-batch cycle
p. 2430
90.0
%
84.2
%
-6.4%
green
Δ-bands per Logan & Regan 2006 lab-to-lab reproducibility envelope: green ≤±25%, amber ±25–50%, red >±50%. Predictions from Butler-Volmer + Ohmic + Tafel closure calibrated against the Logan corpus (regression-tested in butler-volmer-calibration.test.ts).
What we don't know about this paper (4 items)
The 766 mW/m² peak is the WITH reduced spacing (2 cm) and continuous-flow advection configuration. At the paper's 4 cm baseline spacing the peak was ~360 mW/m² — closer to the Liu-Logan 2004 acetate number. The 766 mW/m² ≠ the only Logan-group air-cathode datapoint; it's a specific optimization.
CE = 32% is reported at MPP. The paper also reports CE values up to ~60% at higher R_ext (lower current draw), but those aren't the peak-power operating point. Use the MPP CE for like-for-like comparison with our predicted optimum.
Continuous-flow advection through the porous anode is a configuration the BV preset does NOT model — `hrt_h: 12` is a coarse proxy. The actual paper uses HRT = 1.06 hours with flow through the cloth. The Δ for substrate (COD removal) will be optimistic.
Mixed-culture "Geobacter-enriched" is treated by the BV map as G_sulfurreducens_pure for kinetic parameters; the real biofilm is a community. This is a known scope limitation.