Photocatalytic Water Splitting Patent Landscape 2026
Photocatalytic Water Splitting Patent Landscape in 2026
The photocatalytic water splitting patent field is at a mature plateau, with annual filing volumes stabilised near peak levels and the top five filers accounting for roughly a quarter of the hundred largest filers’ combined output. The Council of Scientific and Industrial Research leads the ranking, but a dense cluster of Middle Eastern universities and energy conglomerates signals that geopolitical energy strategy is now a primary driver of activity.
A moderately concentrated field led by public research institutions and Gulf-linked energy organisations
The Council of Scientific and Industrial Research holds the top position by patent records, followed closely by Shell Internationale Research Maatschappij BV and King Abdullah University of Science and Technology. The top five filers — also including King Fahd University of Petroleum and Minerals and the Regents of the University of Michigan — collectively represent roughly 24% of the hundred largest filers’ combined total, indicating a moderately concentrated but not oligopolistic landscape.
The tier gap between first and fifth place is narrow: the leader holds 44 patent records against 28 for fifth-ranked Michigan, a ratio of under 2:1. This compressed tier structure means no single player has yet established decisive IP dominance, and the ranking remains contestable.
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 1 | COUNCIL OF SCI & IND RES | 44 | |
| 2 | Shell Internationale Research Maatschappij BV | 42 | |
| 3 | KING ABDULLAH UNIV OF SCI & TECH | 39 | |
| 4 | King Fahd University of Petroleum and Minerals | 34 | |
| 5 | Regents of the University of Michigan | 28 | |
| 6 | SABIC Global Technologies BV | 27 | |
| 7 | Element 1 Corp | 26 | |
| 8 | GM Global Technology Operations LLC | 21 | |
| 9 | Regents of the University of California | 20 | |
| 10 | Centre National de la Recherche Scientifique (CNRS) | 18 |
| # | Applicant | Patent records | Share |
|---|---|---|---|
| 11 | United Arab Emirates University | 16 | |
| 12 | Plaisted Robert A | 16 | |
| 13 | Bailey Kenneth Stephen | 16 | |
| 14 | Vigen Eric Arno | 16 | |
| 15 | SunPower Technologies LLC | 15 | |
| 16 | Toyota Motor Corporation | 13 | |
| 17 | SABIC Agri-Nutrients Company | 11 | |
| 18 | Fuzhou University | 11 | |
| 19 | SBA Materials Inc | 11 | |
| 20 | McGill University | 10 |
The prominence of Gulf institutions (King Abdullah University of Science and Technology, King Fahd University of Petroleum and Minerals, SABIC Global Technologies) alongside a major European energy company (Shell) and India’s national research council suggests that sovereign energy-transition mandates — rather than purely commercial motives — are shaping who files and where capital flows in this space.
Filing counts for 2024–2026 should be treated as provisional, as patents typically take 18–24 months from filing to publication; the apparent dip in those years reflects publication lag rather than a genuine slowdown. Longer-window growth, applicant concentration, and technology-route coverage are therefore more reliable signals than the latest-year bar alone.
Activity has plateaued near its 2017 peak; inorganic chemistry and catalysis dominate the technology mix
The annual trend chart and the IPC branch breakdown together reveal a field that has matured technically — with a well-established core — while several adjacent branches remain comparatively sparse.
Annual filing trend
Annual filings peaked at 94 patent records in 2017, then fluctuated — with a notable trough in 2020 — before stabilising in the low-to-mid 70s through 2022–2023. The 19% growth recorded across the recent multi-year window confirms the field is still expanding on a cumulative basis, though annual volume has eased from the 2017 peak. Data for 2024–2026 are incomplete due to publication lag and should not be read as a trend break.
↗ Hover for values · click a bar to ask EurekaTechnology composition
Non-metallic elements and inorganic compounds (C01B) and chemical/physical processes and catalysis (B01J) together account for the two largest branches, reflecting the field’s grounding in heterogeneous photocatalyst design. Electrolytic production of compounds (C25B) forms a substantial third cluster, capturing photoelectrochemical and hybrid PV-electrolyser approaches. Semiconductor devices (H01L), separation processes (B01D), and batteries and fuel cells (H01M) are present but at materially lower densities, marking them as adjacent rather than core.
↗ Hover for values · click a bar to ask EurekaHighly cited patent families surfaced by the query
Citation-heavy patent families returned by the query. Use this section as citation context, not as a curated list of the most topic-specific patents.
Lunar base energy supply and application system ba…
A lunar base energy supply and application system based on photocatalytic water splitting hydrogen production technology are provided. The system includes a solar photovoltaic power generation unit, a power management unit, a water storage tank, a photocatalytic water splitting unit, an hydrogen-oxygen storage unit, an hydrogen-oxygen-water conversion unit… (excerpt from the patent abstract)
| # | Patent | Citations |
|---|---|---|
| 1 | Optimizing photovoltaic-electrolyzer efficiency | 324 |
| 2 | Block copolymer processing for mesostructured inor… | 268 |
| 3 | Optimizing photovoltaic-electrolyzer efficiency | 214 |
| 4 | Method and apparatus for hydrogen generation | 156 |
| 5 | Optimizing photovoltaic-electrolyzer efficiency | 137 |
| 6 | Block polymer processing for mesostructured inorga… | 122 |
| 7 | High Efficiency Broadband Semiconductor Nanowire D… | 103 |
| 8 | Photo-electrochemical cell | 77 |
Ranked by total forward citations. Citation counts favour older and broadly cited patent families, and broad or adjacent patents may appear when they match the search scope. Treat this section as citation context, not as a curated list of the most topic-specific patents. Some patent titles may be shown in their original, non-English language where an accurate translation could not be guaranteed.
What the structural data means for R&D investment decisions
Four dimensions — lifecycle stage, competitive concentration, collaboration networks, and geographic coverage — each carry distinct implications for teams deciding where to build or license IP.
Field at a mature plateau: incremental gains dominate at the core
Annual filings have plateaued near their 2017 peak, consistent with a field where the foundational catalyst chemistries and photoelectrochemical architectures are well-understood. New entrants face a crowded core (C01B and B01J) but face lower prior-art density in adjacent branches such as semiconductor device integration and gas-separation coupling. Teams entering now should target technically differentiated sub-routes rather than broad catalysis claims.
Lifecycle: MaturityTop-tier compression: no single player holds decisive IP control
The top five filers account for 24% of the hundred largest filers’ combined patent records, and the leader-to-fifth ratio is under 2:1 — unusually tight for an energy technology field. This means freedom-to-operate is relatively open compared with, for example, electrolysis or photovoltaics. However, the co-presence of large energy companies (Shell, SABIC) and well-funded Gulf universities creates a credible risk of accelerated consolidation if any of these players pivot to aggressive licensing.
Moderate concentrationCNRS anchors the most active co-filing network in Europe
The Centre National de la Recherche Scientifique (CNRS) is the most prolific co-filer, maintaining active partnerships with TotalEnergies (9 joint records), the Ecole Nationale Superieure de Chimie de Montpellier (9), the Ecole des Hautes Etudes en Sciences Sociales / EHESS cluster (4 each with multiple Paris institutions), and the Universitat Politecnica de Valencia (4). King Abdullah University of Science and Technology co-files with Imperial College London (3 records). These networks reveal that the most active collaborative IP generation is concentrated in French academic-industrial consortia and Gulf–UK academic linkages, offering potential partnership anchors for teams lacking photocatalyst synthesis expertise.
CNRS-led networkUS and China lead filings; Gulf and India emerging as strategic jurisdictions
The United States is the lead filing jurisdiction by patent records, followed by China. WIPO PCT and European Patent Office filings indicate broad international protection strategies are common among the larger applicants. India, Australia, and Canada form a secondary tier. The presence of UAE and Saudi Arabia as dedicated filing destinations — beyond the Gulf-based applicants’ home activity — confirms that these markets are being treated as commercially meaningful destinations, not merely academic territories.
US · China · PCT coreGo beyond the landscape: Eureka’s TRIZ Solution agent breaks down an R&D problem and returns patented concept solutions, each with a technical approach and cited patent & literature evidence.
| Applicant | Collaborator | Co-filings |
|---|---|---|
| Centre National de la Recherche Scientifique (CNRS) | TotalEnergies SE | 9 |
| Centre National de la Recherche Scientifique (CNRS) | Ecole Nationale Superieure de Chimie de Montpellier | 9 |
| Shell Internationale Research Maatschappij BV | Shell Oil Company | 6 |
| Centre National de la Recherche Scientifique (CNRS) | Consejo Superior de Investigaciones Cientificas (CSIC) | 4 |
| Centre National de la Recherche Scientifique (CNRS) | Ecole Normale Superieure | 4 |
| Centre National de la Recherche Scientifique (CNRS) | Paris Sciences et Lettres University | 4 |
| Centre National de la Recherche Scientifique (CNRS) | Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris) | 4 |
| Centre National de la Recherche Scientifique (CNRS) | Universitat Politecnica de Valencia | 4 |
| King Abdullah University of Science and Technology (KAUST) | Imperial College London | 3 |
| Centre National de la Recherche Scientifique (CNRS) | CY Cergy Paris University | 3 |
Co-filing pairs, ranked by the number of jointly-filed patent families.
Council of Scientific and Industrial Research leads; King Fahd University and University of Michigan are the fastest-rising new entrants
The top two players differ sharply in trajectory: the leader shows moderate, steady growth while Shell’s activity has contracted dramatically. Meanwhile, several Gulf and US university entrants are building positions rapidly from a low base.
Council of Scientific and Industrial Research
The Council of Scientific and Industrial Research (CSIR, India) holds 44 patent records — the highest in the ranking — with a recent-period trend of +9%, indicating continued, if measured, momentum. Its technical focus sits squarely at the intersection of photocatalyst design (B01J 35 and B01J 23) and inorganic hydrogen chemistry (C01B 3), reflecting India’s national priority on solar hydrogen production. CSIR’s breadth across both catalyst formulation and hydrogen generation positions it as the most comprehensively covered public-sector filer in the field.
families: 44King Fahd University of Petroleum and Minerals
King Fahd University of Petroleum and Minerals holds 34 patent records and is classified as a new entrant by recent-period momentum, meaning its current filing base is predominantly recent. Its technology emphasis is strongly electrolytic (C25B 1 and C25B 11 each receiving 34 records) with a secondary focus on coating and surface deposition (C23C 16, 11 records), suggesting a strategy oriented toward photoelectrode engineering rather than bulk catalyst synthesis. This makes it a distinctive voice in the field relative to the catalysis-heavy leaders.
families: 34| Applicant | Recent (3 yrs) | Trend |
|---|---|---|
| Council of Scientific and Industrial Research (CSIR) | 12 | ▲ +9% |
| Shell Internationale Research Maatschappij BV | 1 | ▼ -97% |
| King Abdullah University of Science and Technology (KAUST) | 2 | ▲ new entrant |
| SABIC Global Technologies BV | 2 | ▲ new entrant |
| King Fahd University of Petroleum and Minerals | 19 | ▲ new entrant |
| Regents of the University of Michigan | 22 | ▲ new entrant |
| Regents of the University of California | 3 | ▲ new entrant |
| United Arab Emirates University | 7 | ▲ new entrant |
Semiconductor device integration and water-treatment coupling are under-served relative to their technical relevance
Five IPC branches appear in the corpus at materially lower densities than the C01B/B01J core. Two stand out for having both plausible technical value and a realistic entry path for teams already active in photocatalysis.
H01L · Semiconductor device integration for photocatalysis
Semiconductor devices (H01L) appear at 91 patent records — roughly 14% of the C01B count — despite being a critical enabler of tandem and III-V photoabsorber architectures that are widely cited in the academic literature as the route to solar-to-hydrogen efficiencies above 10%. King Abdullah University of Science and Technology is the primary filer in this sub-space (H01L 31, 22 records), but coverage is thin relative to the technical importance. Teams with compound-semiconductor or thin-film PV backgrounds could find lower prior-art density here than in bulk catalysis routes.
Search this in Eureka →C02F · Water and wastewater treatment coupling
The water and wastewater treatment branch (C02F) registers only 55 patent records, representing a sparse intersection between photocatalytic hydrogen generation and simultaneous pollutant degradation — a dual-use configuration that could improve overall system economics by treating industrial wastewater as a sacrificial electron donor. This is a conceptually mature approach in academic literature but remains lightly claimed in the patent corpus, suggesting that integrated reactor designs combining hydrogen evolution with water remediation have not yet attracted concentrated IP activity from any leading filer.
Search this in Eureka →How leading filers differ across technology routes
Strength of each leader across the main technology routes.
| Player | C01B 3 · Non-metallic elements & inorganic compounds | C25B 1 · Electrolytic production of compounds | B01J 35 · Chemical/physical processes & catalysis | B01J 27 · Chemical/physical processes & catalysis | B01J 23 · Chemical/physical processes & catalysis |
|---|---|---|---|---|---|
| SABIC Global Technologies BV | Strong · 38 | Moderate · 9 | Strong · 20 | Emerging · 5 | Moderate · 19 |
| Council of Scientific and Industrial Research (CSIR) | Strong · 25 | Strong · 18 | Strong · 25 | Absent | Strong · 23 |
| King Abdullah University of Science and Technology (KAUST) | Strong · 24 | Strong · 28 | Absent | Absent | Emerging · 4 |
| Shell Internationale Research Maatschappij BV | Strong · 37 | Moderate · 15 | Absent | Absent | Absent |
| Centre National de la Recherche Scientifique (CNRS) | Strong · 16 | Absent | Strong · 16 | Absent | Moderate · 4 |
| King Fahd University of Petroleum and Minerals | Absent | Strong · 34 | Absent | Absent | Absent |
| Regents of the University of Michigan | Absent | Strong · 16 | Moderate · 6 | Absent | Moderate · 8 |
Frequently asked questions
The analysis covers 650 patent families in the photocatalytic water splitting domain, spanning global filings across all major jurisdictions.
The Council of Scientific and Industrial Research (CSIR, India) leads with 44 patent records, ahead of Shell Internationale Research Maatschappij BV at 42 and King Abdullah University of Science and Technology at 39.
On a multi-year basis, yes — the recent growth window shows a 19% increase. However, annual filing volumes have eased from their 2017 peak and have since plateaued, placing the field in a maturity stage rather than an active growth surge. Data for 2024–2026 are incomplete due to publication lag.
The United States leads with 281 patent records, followed by China at 259. WIPO PCT filings (134 records) and the European Patent Office (95 records) are the primary routes for international protection. India, Australia, and Canada form a notable secondary tier.
The Centre National de la Recherche Scientifique (CNRS) is the most active co-filer, with 9 joint records each alongside TotalEnergies and the Ecole Nationale Superieure de Chimie de Montpellier, and multiple 4-record partnerships with Paris-region institutions and the Universitat Politecnica de Valencia. King Abdullah University of Science and Technology co-files with Imperial College London.
Semiconductor device integration (H01L, 91 patent records) and water and wastewater treatment coupling (C02F, 55 records) are the most technically plausible adjacent branches with materially lower filing density than the core catalyst chemistry classes. These are observations of relative sparsity — whether they represent viable entry points depends on each team’s existing technical capabilities and freedom-to-operate position.
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Disclaimer. This page is generated from PatSnap Eureka data drawn from a limited snapshot of global patent and scientific-literature records, and is provided for general information and reference only.
Patent data carries inherent limitations: recent filings (typically the most recent 18–24 months) are under-counted due to standard publication lag; counts may be reported at either a patent-family or a patent-record basis and are not always directly comparable; classification, applicant-name, and citation data may contain errors, duplicates, or omissions; and the underlying search query defines and constrains the scope shown. As a result, the analysis may be incomplete or inaccurate and may not reflect the full technology landscape.
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