Coating of Low-Cost Asphaltenes-Derived Carbon Fibers with V<sub>2</sub>O<sub>5</sub> for Supercapacitor Application
Bibliographic record
Abstract
V2O5-coated, low-cost carbon fibers were produced using asphaltenes and V2O3 as precursors, both industrial byproducts. Asphaltenes can be used without any further treatment to fabricate low-cost carbon fibers. The carbon fibers were coated with V2O5 using a straightforward two-step coating procedure, that is, surface etching of fibers with NH4OH, followed by dipping into a V2O3 solution. This facile process represents a time-saving and low-cost alternative to other metal oxide coating techniques, such as atomic layer deposition, to create fiber-based electrode materials. After annealing, the fibers were homogeneously coated with V2O5 and exhibited porosity. Annealing time and temperature influenced the porosity and structure of the fiber material. The highest surface area (440 m2 g–1) was obtained at the highest annealing temperature. The coated fibers show both micropores and mesopores. The different fiber samples were then utilized as supercapacitors using a 1 M Li2SO4 electrolyte. Specific capacitances of up to 125 F g–1 at a rate of 0.25 A g–1 were achieved. Long-term cycling tests showed a capacitance retention of 89% after 10,000 cycles. A strong surface area dependence for the capacitance and increased pseudocapacitance for higher annealing temperatures are demonstrated.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".