Extraction dataset and analysis code for a source-verified quantitative synthesis of > banana-residue-derived supercapacitor electrodes
This deposit contains the complete extraction dataset, analysis code, intermediate results, and figure-generation pipeline supporting a quantitative research synthesis of supercapacitor electrodes derived from banana biomass residues (peel, pseudostem, bract, leaf, and fibre). The dataset comprises 28 electrode conditions extracted from 16 peer-reviewed primary studies, each independently verified as indexed in Scopus or Web of Science, with every reported value confirmed against the publisher's record of the primary source. The unit of analysis is the electrode condition rather than the paper, because individual studies commonly report several conditions; the 28 rows are therefore **not** 28 independent studies, and any re-analysis must account for the clustering of conditions within studies. Recorded fields cover the banana fraction used, conversion route, activation agent and temperature, heteroatom doping, BET surface area, pore volume and pore-size class, electrolyte identity and concentration, electrode configuration, measurement current density or scan rate, and the reported outcomes of specific capacitance, energy density, power density, capacitance retention and cycle count. Two provenance fields record, for every value, whether it was read from the publisher's full text or an open abstract, and the indexing-verification status of the source journal. A separate sheet documents every excluded record with its exclusion reason, including values that were removed during verification because they could not be confirmed in the primary source. The accompanying code reproduces every statistic, table, and figure reported in the associated article from the raw extraction, in ten documented stages: descriptive and bivariate analysis; a leave-one-out machine-learning layer; a robustness suite covering distributional form, rank-based re-estimation, bootstrap intervals, false-discovery-rate correction and variance inflation; PRISMA and effect-size figures; subgroup and influence diagnostics; a conditional meta-analytic apparatus reporting fixed-effect and random-effects pooling, Cochran's Q, I-squared, H-squared, tau-squared, prediction intervals and the Egger and Begg tests; a reproducible six-domain risk-of-bias assessment; measurement-basis stratification with cluster-robust and wild cluster bootstrap inference; a statistical power and feasibility analysis; and an assessment of compliance with existing published reporting guidelines for electrochemical capacitors. Reported specific capacitance is not commensurable across records: values span two- and three-electrode configurations, measurement rates across more than four orders of magnitude, and electrolytes with different stable voltage windows, and no study states the mass basis on which gravimetric quantities are reckoned.