Lanthanum and manganese co-doped cobalt oxide spinel catalyst for oxygen evolution

The oxygen evolution reaction (OER) is the kinetic bottleneck in alkaline water electrolysis, and the field has long been divided between benchmark-performing but scarce iridium and ruthenium oxides on one side, and plentiful but underperforming base-metal oxides on the other. Lanthanum and manganese co-doped cobalt oxide spinel closes that gap in a way that a single-dopant strategy cannot: lanthanum expands the cobalt-oxide lattice and modifies the oxygen p-band, while manganese tunes the transition-metal d-band occupancy, together pushing the material squarely into the center of the OER activity volcano. The result is an anode catalyst achieving less than 290 mV overpotential at 10 mA/cm² in 1 M KOH, with Tafel slopes in the 40–75 mV/decade range, and no more than 20 mV overpotential increase after 2,000 CV cycles — a combination that leaves bare cobalt oxide well behind on every dimension that matters to alkaline and anion-exchange-membrane electrolyzer manufacturers. The strategic importance of this asset within the integrated packaging, storage, and PFAS-treatment systems portfolio sits at the intersection of cost and timing. Green-hydrogen policy mandates in the EU, US, and East Asia are forcing electrolyzer makers to qualify non-precious-metal anodes at gigawatt scale, and cobalt spinels are the most production-ready substrate. An asset that specifically claims the La+Mn co-doped composition tied to verified kinetic and durability limits occupies defensible whitespace between the crowded bare-cobalt-oxide landscape and the broad published literature, threading a needle that required careful claim engineering. The filing also anchors an extensible spinel family that includes zinc, magnesium, and manganese ferrite variants, giving it long-term breadth beyond the lead composition. The timing dynamic is real: the IrO2/RuO2 supply ceiling is not theoretical — iridium is produced as a byproduct of platinum mining at roughly eight tonnes per year globally, and no credible new primary supply is on the horizon. Every alkaline electrolyzer gigafactory being built today must eventually run on a non-precious anode, and the combination of performance, cycle durability, and earth-abundant feedstocks positions this catalyst family to benefit from that forced substitution. For a licensing or acquisition counterparty, this asset provides both a near-term product-development anchor and a portfolio hedge against precious-metal price volatility.

The lead composition is La,Mn:Co3O4 — a cobalt-rich spinel oxide crystallizing in the Fd-3m space group — with lanthanum substitution in the 0.5–5 atomic percent range and manganese co-substitution in the 0.5–8 atomic percent range. These are not arbitrary windows: they are narrow enough to define a composition space that is distinguishable from prior art and broad enough to cover practical synthesis tolerances. The spinel structure is intrinsically favorable for OER because it provides both octahedral (16d) and tetrahedral (8a) sites, and the cobalt occupancy of those sites controls the oxyl-binding energy that determines where on the volcano the material lands. Lanthanum, as an oversized rare-earth cation, does not substitute cleanly into cobalt sites; instead it segregates slightly to grain boundaries and generates local strain that modifies the Co–O bond length and consequently the Co 3d / O 2p hybridization. Manganese, by contrast, substitutes more directly for cobalt in the octahedral sublattice, altering the formal oxidation state distribution between Co²⁺ and Co³⁺ and creating a gradient of local electronic environments that collectively shift the average ΔG_OH adsorption energy toward the thermodynamic optimum. The combination of these two mechanisms — structural strain from La and electronic tuning from Mn — is the core of why co-doping outperforms either dopant alone. Computational validation has been performed at two levels. A descriptor screen (OER-LAMNCO-001) established the plausibility of the co-doping approach by surveying the relevant spinel compositional space and identifying La+Mn co-doped compositions as falling within the activity window. More concretely, a machine-learning interatomic potential calculation of the (110) surface of Co3O4 yielded a delta-G for OH adsorption (ΔG_OH) of approximately −0.185 eV, which places the material within the productive region of the OER volcano where neither O nor OH binding is excessively strong or weak. This value was computed using an MLIP surface model and is consistent with DFT-sourced benchmarks for high-activity cobalt spinels. One DFT source has been incorporated into the validation base. It is important to be clear about what is computationally established versus what is still a validation gate: the phonon (dynamic) stability cross-check across multiple independent machine-learning potentials that is standard practice for other materials in the portfolio has not yet been reported as applicable here, because the experimental performance claims anchor the asset more directly to measured electrochemical data than to a from-scratch stability prediction. The multi-engine phonon consensus protocol is not flagged as completed for this system; instead, the primary computational deliverable is the surface adsorption-energy calculation corroborating OER activity. Two proof gates remain open and are honestly described as such. The first is a DFT+U calculation for an iron-substituted compositional arm. Iron is a potent OER promoter in cobalt oxides — it is well established that trace Fe from the KOH electrolyte can significantly boost activity — and a deliberate iron-substituted variant of this spinel family is held in reserve pending that calculation. Once completed, the Fe-substituted arm could expand the claim scope into a compositionally distinct sub-family with its own performance signature. The second open gate is extended experimental durability validation. The current headline of less than 20 mV degradation over 2,000 CV cycles is strong but falls short of the 10,000-cycle or thousand-hour constant-current benchmarks that major electrolyzer qualification programs demand. Demonstration data at longer timescales, and ideally under industrially relevant conditions (elevated temperature, pressurized alkaline or carbonate-free AEM electrolyte), will be needed to fully de-risk the commercial story. The spinel family claimed extends beyond the lead La,Mn:Co3O4 composition to include ZnCo2O4, MgCo2O4, MnFe2O4, CoMn2O4, and MgMn2O4. This breadth is strategically important: it means the family claim covers alternative spinels that a competitor might engineer around to if they were constrained only to the cobalt-rich lead composition. The inclusion of magnesium and zinc cobaltates extends coverage into cobalt-light spinels that may be commercially attractive if cobalt supply chains tighten further, while the manganese and iron ferrites provide a nearly cobalt-free fallback. The architectural choice to claim a family rather than a single composition reflects a deliberate layering strategy across the claim set.

The addressable market for non-precious OER anode catalysts maps directly onto the global alkaline and anion-exchange-membrane (AEM) electrolyzer market. Current estimates for installed alkaline electrolyzer capacity suggest the market for anode materials is in the low-single-digit billions of dollars annually today, scaling into the tens of billions as national hydrogen strategies materialize. The commercial estimate here, stated as an estimate, places the addressable opportunity in the $1–5 billion range — this likely reflects near-to-medium-term catalyst supply into operating electrolyzers rather than the full theoretical buildout, and should be read as a conservative anchor rather than a ceiling. At scale, with gigawatt electrolyzer deployments requiring continuous catalyst resupply, the market for a qualified non-precious anode catalyst is structurally recurring in a way that few materials markets are. Who buys this technology? The primary customers are alkaline and AEM electrolyzer manufacturers — companies building the stack hardware for green-hydrogen production at industrial scale. This includes large industrial-gas and energy companies with in-house electrolyzer divisions, as well as dedicated electrolyzer OEMs expanding rapidly on the back of government incentives. These buyers license or procure anode catalyst formulations either directly from catalyst suppliers or through partnerships that give them IP protection. A secondary customer class is the electrode and coating companies that sell functional catalyst layers to electrolyzer assemblers; they represent an earlier point in the value chain and may seek licensing rights to protect their own product differentiation. Royalty or licensing structures in this space typically attach to catalyst loading per unit area or per kilogram of active material, meaning a small royalty per gram of co-doped spinel applied to a commercial electrode stack can aggregate to meaningful revenue at scale. The licensing logic for this asset is strengthened by the specificity of the composition window and performance claims. A counterparty cannot simply buy in to a generic cobalt-oxide spinel supply chain and remain free of this IP — the La+Mn co-doping within the claimed ranges, combined with the specific kinetic and durability benchmarks, narrows the protected space to the high-performance corner of the composition map. This means that any commercial actor who formulates toward the target overpotential and cycle-life performance will be working within the claim space, giving the asset real commercial reach that a broader but weaker claim set would not have.

cobalt-rich rare-earth+Mn-modified OER in volcano window

narrowed by kinetic (Tafel) + durability features in combination with La/Mn co-doped composition

The most natural acquirers and licensees are alkaline and AEM electrolyzer manufacturers who are actively qualifying non-precious-metal anode catalysts for next-generation stack designs. This includes large industrial-energy companies building in-house electrolysis capacity, dedicated electrolyzer OEMs scaling rapidly on government incentives, and advanced-materials companies supplying functional catalyst layers to the electrolyzer supply chain. For any of these buyers, the La+Mn:Co3O4 family offers a path to IP-protected product differentiation in a market where the anode catalyst is increasingly the defining technical variable — and where the alternative of licensing IrO2-based technology carries both cost and supply-chain risk. Chemical companies with cobalt-processing capabilities and existing relationships with electrolyzer manufacturers represent a second tier of potential licensees, since the catalyst synthesis scales naturally from existing cobalt oxide production infrastructure. Strategic fit is also plausible for national laboratories or government-affiliated research organizations seeking to anchor a non-precious OER platform with defensible IP before commercial partners claim the most productive composition space. The portfolio context — integrated packaging, storage, and PFAS-treatment systems — suggests that Lattice Graph is building a materials IP position across a range of clean-technology applications; an acquirer of the broader portfolio would find the OER catalyst asset complementary to any hydrogen-storage or water-treatment holdings in that collection, since alkaline electrolysis sits at the intersection of clean-hydrogen production and industrial water management.

The most significant technical risk is the narrowness of the claim footprint. The La+Mn co-doping concept has been published in a high-profile journal, and the claim survival depends on the specific combination of composition window, Tafel slope range, and cycle-life limit holding up as non-obvious over that prior art during examination. If the examiner reads the Science 2023 publication as teaching the performance advantages of the combination, the claims will require further narrowing or additional distinguishing features — potentially pushing the protected composition window into a still smaller corner of the space. The iron-arm extension is explicitly held pending DFT+U, and until that gate clears, the family is effectively limited to cobalt-rich and cobalt-light spinels without an iron component, which leaves a significant portion of the high-performance OER spinel landscape outside the current claim perimeter. The roadmap to de-risking is specific: completing the DFT+U iron-arm calculation expands the claim family and provides a second, compositionally distinct line of defense against design-around attempts; generating 10,000-cycle or constant-current durability data under industrially relevant conditions converts the current 2,000-cycle result into a commercially meaningful qualification data point; and engaging electrolyzer manufacturers in co-development agreements early creates market validation that strengthens both the commercial case and the claim differentiation narrative. The competitive timeline is not stated with a hard deadline in the available data, but the pace of alkaline electrolyzer deployment means that anode catalyst qualification programs are running now — delay in completing the open proof gates is not cost-free.