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REVIEW 4 major objections 6 minor 71 references

Predicting aqueous and electrochemical stability of 2D materials from extended Pourbaix analyses

T0 review · 4 major / 6 minor · reviewed 2026-08-07 · deepseek-v4-flash

Pith's one-line read A new stability map rescues 2D materials that standard Pourbaix diagrams call unstable.

desk verdict A useful extension of Pourbaix analysis to early intermediates, with a strong CPD screen and three case studies, but the quantitative claims about reproducing MoS2's stability window and desulfurization potential are overstated. read the letter →

arxiv 2506.07839 v1 pith:LMOGJEZC submitted 2025-06-09 cond-mat.mtrl-sci physics.chem-phphysics.comp-ph

classification cond-mat.mtrl-sciphysics.chem-phphysics.comp-ph
keywords 2DmaterialsPourbaixdiagramselectrochemicalstabilitysurfaceearlydegradationstepsMoS2phosphoreneMXenes
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The reading

Standard Pourbaix diagrams compare a material against its fully dissolved or oxidized products and ignore all intermediate steps, so they classify almost all 2D materials as unstable in water even when experiments show the materials survive. In a screen of more than 3,000 monolayer materials, the paper finds that no more than 2.1 percent are predicted stable under hydrogen- and oxygen-evolution conditions, and nearly all of those are oxides. The paper argues that the first microscopic degradation steps, adsorption of oxygen, hydroxyl, or hydrogen on the surface and creation of single-atom vacancies, should be treated as the relevant competing states. If those early steps cost energy, the material is stable or metastable; if they release energy, corrosion begins. Applied to MoS2, this 'surface Pourbaix' analysis reproduces the measured pH-voltage stability window and the desulfurization potential, while for phosphorene and the MXene Ti2C it explains spontaneous degradation and potential-dependent surface termination.

What carries the argument

The central object is the surface Pourbaix diagram (SPD), a pH-versus-potential phase map whose competing phases are 'early intermediate states' of the surface rather than final decomposition products. The early intermediates are adsorption configurations of oxygen, hydroxyl, and hydrogen at several coverages, plus single-atom vacancy configurations representing the first dissolution step. For each configuration the paper computes the free energy of forming it from the pristine surface and aqueous species as a function of pH and applied potential, including a correction for ion buildup near a charged electrode; if the least unfavorable early step is still uphill, the material is classified as stable in that region. The machinery runs on density-functional-theory energies of relaxed surface supercells and produces both full diagrams and energy profiles along chosen pH or potential lines.

What would settle it

A 2D material observed to corrode inside its SPD-predicted stable window through a first step not present in the diagram, for example preferential edge etching or formation of a divacancy with negative free energy, would falsify the claim that the considered early intermediates control stability.

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Extended reading notes

Core claim

The central claim is that conventional Pourbaix stability is the wrong yardstick for 2D materials because full decomposition reactions, such as MoS2 plus water to MoO3, sulfate, protons, and electrons, pass through many costly intermediate states that the diagram ignores. The paper's surface Pourbaix diagram (SPD) instead labels a material stable in a given pH and applied-potential region when every considered early degradation step, oxygen, hydroxyl, and hydrogen adsorption plus single-vacancy formation, has positive free energy. For MoS2 the SPD yields a stability window at pH 0 between +0.3 V and -1.1 V versus SCE, matching cyclic voltammetry, and places the onset of sulfur dissolution at -0.84 V versus RHE, consistent with the experimentally observed onset near -0.5 V and saturation near -1.0 V. The framework also shows that a pre-existing Mo vacancy lowers the formation energy of a neighboring S vacancy from 2.97 eV to 0.91 eV, shrinking the stability window, so defect content changes the prediction. For phosphorene the diagram at zero applied potential shows exoergic oxidation and dissolution accompanied by hydrogen evolution, explaining ambient degradation; for Ti2C it predicts full-monolayer passivation with termination depending on pH and potential.

Load-bearing premise

The stability classification rests on assuming that the few early degradation steps included, adsorption of oxygen, hydrogen, and hydroxyl plus single-atom vacancy formation at selected coverages, are the only relevant ways corrosion can start, and that the sign of their free energy, with no barrier to cross, decides stability.

Editorial extensions

If this is right

  • Conventional Pourbaix diagrams should not be read as a final verdict on aqueous stability; the early-step analysis flips the prediction for MoS2 from unstable to a wide stable window consistent with experiment.
  • Electrocatalyst screening can use SPD-type analysis to rescue candidate materials that are globally unstable but kinetically protected by uphill first steps, which is exactly the situation of many 2D catalysts.
  • Defect engineering changes stability: the prediction that Mo vacancies make sulfur dissolution easier implies defect-poor MoS2 should be used when long-term stability matters.
  • The same diagram can predict the working surface of a catalyst, such as the monolayer oxygen, hydroxyl, or hydrogen termination of Ti2C, not just whether the material survives.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • The paper leaves implicit that the same early-intermediate logic could be applied to edge sites, grain boundaries, and water-assisted vacancy formation; if those omitted first steps are downhill where basal-plane steps are uphill, stability would be morphology-dependent.
  • A quantitative descriptor not developed in the paper would be the minimum early-step free energy over a pH-voltage grid, usable as a screening metric for large 2D materials databases alongside convex-hull energies.
  • A direct test beyond the three case studies is to compare SPD-predicted stability windows with published cyclic voltammetry for other transition-metal dichalcogenides and MXenes.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

4 major / 6 minor

Summary. The paper performs conventional Pourbaix analysis on a large set of 2D materials from the C2DB, finding that only a small fraction are predicted stable under HER/OER conditions. To overcome the known limitations of conventional Pourbaix diagrams, the authors introduce a surface Pourbaix diagram (SPD) that includes 'early intermediate states' (adsorbed O/OH/H and single surface vacancies) and apply it to MoS2, phosphorene, and Ti2C. The central claim is that for MoS2 the SPD quantitatively reproduces the experimental pH-U stability window and the desulfurization potential, while for phosphorene and Ti2C it provides mechanistic insight into degradation and surface termination. The paper also releases the code and data used for the analysis.

Significance. If the central claims are correct, the SPD framework is a useful and practical extension of Pourbaix analysis for 2D materials, addressing a recognized shortcoming of conventional thermodynamic stability screening. The open-source implementation in ASE and the public dataset are strengths that support reproducibility and further use by the community. The three case studies demonstrate a credible strategy for turning pessimistic thermodynamic predictions into kinetically informed stability assessments. However, the quantitative validation rests on the MoS2 comparison, which has the inconsistencies detailed in the major comments; therefore the significance of the contribution is currently below what the abstract claims.

major comments (4)
  1. [MoS2; Fig. 3b and Methods Eqs. (5)-(6)] The SPD stability criterion treats any exergonic adsorption as an early degradation step, so O* adsorption above +0.3 V vs SCE terminates the predicted stability window. The cited CV experiments (refs. 39, 40) find no irreversible degradation up to at least +0.5 V, and the paper itself explains the 0.3 V feature as reversible oxygen adsorption. Reversible adsorption is not degradation; by the same criterion any passivated electrode would be classified as unstable. The claimed reproduction of the experimental pH-U stability window is therefore not established unless the stability classification is revised to include reversibly adsorbed O* as a stable surface state.
  2. [MoS2; Fig. 3d] The abstract states that the approach reproduces the experimental desulfurization potential, but the experimental onset is about -0.5 V vs RHE while the predicted onset for exergonic HS- formation is -0.84 V vs RHE, a 0.34 V gap. The text only says the predicted value 'can be related' to the experiment. This gap is comparable to typical DFT/PBE errors and to the uncertainty in the ionic activity used; the claim of quantitative reproduction should be either supported by an error analysis or softened to qualitative agreement.
  3. [Conventional Pourbaix analysis; Fig. 1 and Table 1] The paper reports 3376 materials extracted from C2DB in the text, but Fig. 1 and Table 1 state that the distributions and percentages are computed for 2902 materials, while the data availability statement says 3376 were used. The discrepancy is never explained; all percentages in Table 1 depend on the denominator. The authors should state the filtering steps that reduce 3376 to 2902 and recompute the reported statistics consistently.
  4. [Surface Pourbaix analysis; Methods] The method replaces the CPD's final-state thermodynamics with the free energies of a small set of early intermediates (adsorption at up to 1 ML and single vacancies at one density), but it does not compute transition-state barriers or show that the chosen set is complete. The claim that SPD captures kinetic stability is an assumption, not a demonstrated property. The MoS2 validation is therefore sensitive to the coverage grid, vacancy density, and neglect of edge sites or additional intermediates; the authors should provide a sensitivity analysis or explicitly state this as a limitation of the framework.
minor comments (6)
  1. [Abstract] The phrase 'more than 3000' is inconsistent with the reported 2902 materials; adjust the count or describe the filtering that reduces the initial set.
  2. [Eq. (4) and text after Fig. 2] The sign convention (negative ΔG_pbx means stable) should be stated explicitly in the main text to avoid confusion, especially because the paragraph after Fig. 2 uses the phrase 'unstable (positive ΔG†pbx)' without a prior definition.
  3. [Fig. 3b] The inset and the labels for the low-coverage O* phases are difficult to read; consider enlarging the inset or listing the stable phases separately in a table.
  4. [Methods, surface excess correction] The surface-excess correction is only described in the Supporting Information; a brief statement of its effect on the reported stability window (e.g., shift in potential) should be added to the main text.
  5. [Introduction and Methods] Reference [38] is cited for early intermediates; the authors should also discuss alternative surface Pourbaix approaches to better position the novelty of their formulation.
  6. [Notation] Fig. 1 caption uses 'E_hull' while the text uses 'ΔH_hull'; unify the notation.

Circularity Check

0 steps flagged · score 2.0 of 10

No load-bearing circularity: SPD predictions rest on external DFT, thermodynamic, and experimental-condition inputs; minor self-citations are not used to force the central result.

full rationale

The central claimed result is not circular by construction. The conventional Pourbaix screening uses C2DB hull energies, OQMD solid phases, and SUPCRT92 aqueous thermodynamic data; no stability fraction is fitted to experiment. The surface Pourbaix framework computes early-degradation-step free energies from PBE-D3 DFT through reactions such as Eqs. (5) and (6), with no parameter adjusted to reproduce the MoS2 window. The SO4^2- concentration is a stated experimental boundary condition, not a fitted output. The predicted desulphurization onset at -0.84 V vs RHE is a direct DFT free-energy crossing, while the experimental value near -0.5 V is used only for comparison; the 0.34 V gap is a quantitative accuracy concern, not a circular reduction. The paper itself flags the partial disagreement between the predicted +0.3 V O* passivation onset and the experimental stability up to at least 0.5 V, and reconciles it by attributing the 0.3-0.5 V anodic feature to reversible oxygen adsorption; this is an interpretive judgment about what counts as degradation, not an equation-level equivalence. The self-citations (C2DB, ASE, and earlier Pourbaix work by the same group) supply code and data infrastructure that is independently reproducible and is not invoked as a uniqueness proof. No fitted input is renamed as a prediction, and no claimed principle is justified solely by a self-citation. Hence the derivation chain is self-contained against external benchmarks, with only minor, non-load-bearing self-citations.

Assumptions & free parameters 4 free parameters · 6 assumptions · 0 invented entities

The method rests on a small number of user-chosen concentrations and coverages plus strong modeling assumptions about which early steps matter. No new physical entities are introduced.

free parameters (4)
  • Ionic activity of solvated species = 10^-6 mol/L
    Set in Methods for all charged species in CPD and SPD; enters Eq. (2) through the log Q term. The MoS2 SPD overrides it for SO4^2- to 1.0 mol/L.
  • SO4^2- concentration for MoS2 SPD = 1.0 mol/L (bulk, then surface-excess corrected)
    Chosen from experimental bulk value to compare with CV data; affects the position of S-dissolution boundaries.
  • Vacancy density in SPD supercells = 1 vacancy per 9 unit cells (3x3x1); 4x4x1 for defective references
    S and Mo vacancy formation energies are reported at this density; the stability window shrinks with defects, so this choice is consequential.
  • Adsorbate coverage grid = O, OH, H at 0.1, 0.33, 0.66, 1.0 ML plus 1/9 ML for MoS2 O*
    Discrete coverages define the SPD phase map; intermediate coverages between grid points are not resolved.
assumptions (6)
  • standard math Nernst equation and standard reaction free energy relation as written in Eq. (2)
    The entire Pourbaix construction assumes the pH and potential dependence of reaction free energies follows Eq. (2).
  • domain assumption Chemical potentials of solid and solvated phases from OQMD and thermodynamic tables are accurate
    The CPD and SPD compare against these external phase data; errors in the phase data propagate directly into stability boundaries.
  • domain assumption DFT-PBE+D3 formation energies are accurate enough for quantitative pH-U stability predictions
    The SPD uses PBE+D3 total energies for surfaces, vacancies, and adsorbates without explicit uncertainty estimates.
  • ad hoc to paper The free energy of early degradation steps is a sufficient proxy for kinetic stability
    This is the central hypothesis: no transition-state barriers are computed, and all conclusions about metastability follow from the sign of the first-step free energy.
  • ad hoc to paper The chosen set of early intermediates is complete and representative
    The stability window is only as good as the enumerated adsorption and vacancy configurations; unconsidered first steps could destabilize the material.
  • domain assumption The U=0 slice against a Pt electrode reproduces spontaneous ambient degradation
    For aqueous stability, the material is assumed to act as both anode and cathode and to catalytically perform HER and OER, which is a strong assumption for a specific 2D material surface.

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Pith. "Pith review of Predicting aqueous and electrochemical stability of 2D materials from extended Pourbaix analyses." pith.science (2026). https://pith.science/paper/LMOGJEZC

@misc{pith2026250607839,
  author       = {Pith},
  title        = {Pith review of: Predicting aqueous and electrochemical stability of 2D materials from extended Pourbaix analyses},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/LMOGJEZC}},
  note         = {Machine review of arXiv:2506.07839}
}
abstract

A key challenge for computational discovery of electrocatalytic materials is the reliable prediction of thermodynamic stability in aqueous environment and under different electrochemical conditions. In this work, we first evaluate the electrochemical stability of more than 3000 two-dimensional (2D) materials using conventional Pourbaix diagrams (CPDs). Due to the complete neglect of thermodynamic barriers along the (often complex) reaction pathways, the vast majority of the materials are predicted to be unstable even though some are known to be stable in practice. We then introduce an analysis based on the surface Pourbaix diagram (SPD) including 'early intermediate states' that represent the first steps of the key surface passivation and dissolution reactions. The SPD framework is applied to the 2D materials MoS$_2$, phosphorene, and the MXene Ti$_2$C, all of which are predicted to be unstable by the CPD. For MoS$_2$, our approach reproduces the experimental pH-U stability window as well as the experimental desulphurization potential. For phosphorene and Ti2$_C$, the SPD approach is used to investigate the spontaneous degradation mechanism and the potential-dependent surface termination, respectively, again yielding good agreement with experiments. The SPD-based stability analysis emerges as a versatile and quantitative method for prediction of stability and investigation of surface structures in electrochemical environments.

Figures

Figures reproduced from arXiv: 2506.07839 by the authors.

Figure 1
Figure 1. Distribution of the Pourbaix energy ∆Gpbx calculated for 2902 2D materials with Ehull < 50 meV/atom in different conditions of pH and applied potentials vs. SHE relevant for the HER and OER processes. The dataset is split between oxides (darker color) and non-oxides (brighter color). Conditions U (V) pH % stable materials (of which oxides) Acidic HER 0 0 2.1 (46.5) Neutral HER -0.41 7 1.8 (65.1) Alkaline HER -0.83 1… view at source ↗
Figure 2
Figure 2. a) Representative energy diagram of two different chemical reactions leading to the formation of product A [PITH_FULL_IMAGE:figures/full_fig_p004_2.png] view at source ↗
Figure 3
Figure 3. a) Conventional Pourbaix diagram of MoS2 , with SCE as the counter-electrode. The color map shows the Pourbaix energy per atom. b) Surface Pourbaix diagram of MoS2 with SCE as the counter-electrode. The color map shows the Pourbaix energy per unit formula. An inset covering the darkened region is shown at the top right in order to better highlight the phases associated with narrow stability domains. The dashed green… view at source ↗
Figures from the paper (2 more)
Figure 4
Figure 4. Figure 4: a) Conventional Pourbaix diagram of phosphorene, with Pt as the reference electrode. b) Surface Pourbaix [PITH_FULL_IMAGE:figures/full_fig_p007_4.png]
Figure 5
Figure 5. Figure 5: a) Surface Pourbaix diagram of Ti2C with SHE as the reference electrode, including mixed adsorpion states. The color map shows the Pourbaix energy per unit formula. For better visualization, the reference system chosen for defining the pourbaix energy scale is the 2/3M…

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