[Ta6O19]8−-mediated interfacial OH− supply for efficient seawater electrolysis
Bibliographic record
Abstract
Seawater electrolysis is promising yet challenging, as the rapid multi-step deprotonation process of oxygen evolution reaction (OER), along with the Ca 2+ , Mg 2+ ions, would deplete the accessible OH − ions near the catalyst-electrolyte interface. Herein, we present the hexatantalate [Ta 6 O 19 ] 8− ({Ta 6 }), a robust H-bond acceptor (HA) to customize the interfacial H-bonds and charge transfer of the layered metal organic framework (MOF) electrocatalyst, for efficiency alkaline seawater OER. Experimental findings reveal that the {Ta 6 } cluster reconstructs the H-bond networks both in the MOF interlayers and at the catalyst-electrolyte interface, liberating more free OH − to penetrate the Helmholtz plane and adsorb onto the catalyst surface. The increased accessible OH − deepens the partial reconstruction degree of the MOF into active components. Besides, the {Ta 6 } cluster modulates the electronic configuration of Ni active sites in the MOF framework, enabling the synthesized R-MOF-Ta 6 /NF electrocatalyst to achieve a low overpotential of 235 mV at a current density of 10 mA cm −2 . Moreover, the anion exchange membrane (AEM) electrolyzer utilizing the R-MOF-Ta 6 /NF anode catalyst could operate 195 h at industrial current density (≥200 mA cm −2 ). This study presents a neoteric strategy to enhance the performance of layered catalysts for seawater OER. The hexatantalate [Ta 6 O 19 ] 8− ({Ta 6 }) serves as a robust H-bond acceptor (HA), effectively disrupting the H-bonds in the layers of the Ni-based MOF and at the catalyst-electrolyte interface. Besides, the electron configuration of the Ni active sites is modulated by the d orbitals of {Ta 6 }, leading to a favorable OER catalytic performance in alkaline seawater. • [Ta 6 O 19 ] 8− reconstructs the H-bond networks at the catalyst-electrolyte interface. • More free OH − penetrate the inner Helmholtz plane via reconstructing H-bonds. • The electron transfer from Ni to Ta promotes the alkaline seawater oxidation. • A neoteric strategy to tailor the interfacial H-bond mediated catalysis.
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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 | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 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".