Vantasner AG device program: prior art briefing. Concept source read 2026-10-21; every citation below was confirmed by web search on 2026-10-21. Records are reported neutrally: who, when, venue and digital object identifier (DOI), setup, materials, loading, excitation, conditions, and reported outputs. The design lesson we carry into the piezo-driven hydride suspension program is stated at the end of each record cluster.
Scope of this cluster
This cluster covers metal hydride powders and nano-composites heated in hydrogen (H2) or deuterium (D2) gas, where the gas load itself is the loading step and elevated temperature is the drive. It is the closest engineering cousin to our planned sealed powder beds: no electrolyte, no plasma, the same balance-of-plant (gas reservoir, pressure regulator, flow calorimeter), and the same failure modes to design around (surface oxidation, sample aging, chemical heat masquerading as excess heat). The cluster spans four program lines: the Arata and Zhang palladium powder solid reactors in Japan, the Osaka and Kobe University nano-composite line funded through Technova Inc. (the Material Hydrogen Energy (MHE) project, a Toyota-group company) and replicated at Tohoku University under Yasuhiro Iwamura, the Focardi and Piantelli nickel-hydrogen line in Italy, and the Parkhomov nickel powder reactors in Russia.
Neutral record table
| who | when | venue / DOI | setup | materials | loading | excitation | conditions | reported outputs |
|---|---|---|---|---|---|---|---|---|
| S. Focardi, R. Habel, F. Piantelli (Bologna, Cagliari, Siena) | 1994 | Il Nuovo Cimento A 107 (1): 163 (1994), DOI 10.1007/BF02813080 | nickel rod heated in hydrogen; heat balance measured against electrical input | bulk nickel rod, hydrogen gas | hydrogen loaded into nickel at elevated temperature | resistive heating of the rod in hydrogen | hydrogenrecharged nickel maintained hot during runs | the authors report about 50 W anomalous heat production in the hydrogen-loaded nickel rod |
| Y. Arata, Y.-C. Zhang (Osaka University) | 1999 | Proc. Japan Acad. Ser. B 75 (10): 281-286 (1999), DOI 10.2183/pjab.75.281 | double-structure (DS) cathode: hollow palladium vessel filled with palladium fine powder, immersed in heavy-water electrolysis; inner atmosphere sampled | palladium vessel plus palladium black / fine powder core; D2O electrolyte | highly deuterated palladium powder inside the sealed vessel | deuterium loading by electrolysis at the outer wall; diffusion into the powder bed | continuous electrolysis runs of order 2,000 hours | the authors report excess heat of about 5 to 10 W sustained over 2,000 hours and abundant gaseous helium-4 measured in the inner atmosphere of the DS-cathode |
| Y. Arata, Y.-C. Zhang (Osaka University) | 2002 | Proc. Japan Acad. Ser. B 78 (3): 57-62 (2002), DOI 10.2183/pjab.78.57 | nanometer-sized metal powder (atom clusters) as gas-loading host; solid-state reactor concept | nanometer palladium (and zirconia plus nano-palladium composites) | deuterium or hydrogen absorbed above 300 percent of host metal atom number density, dissolved at room temperature | gas loading; the authors attribute reported heat to condensed deuterium lattices (pycnodeuterium) in cluster unit cells | room-temperature loading; sealed powder beds | the authors report extreme deuterium uptake in nano-clusters (greater than 300 percent against host atom density) and propose each unit cell as a minimum solid-fusion reactor unit |
| Y. Arata, Y.-C. Zhang (Osaka University) | 2008 | APS March Meeting 2008 contributed abstract (meetings-archive.aps.org/mar/2008/a17/13) | electrolysis-loaded powder composite in ionic-solid plus nano-metal form | powdered zirconium-oxide plus nano-palladium (ZrO2 + nanoPd) composite | electrolysis-loaded deuterium in the powder composite | electrolytic loading with the composite held as a packed bed | long-duration run | the abstract reports about 10 W excess heat sustained for about 400 hours |
| A. Kitamura, Y. Sasaki, Y. Miyoshi, A. Taniike, A. Takahashi, R. Seto, Y. Fujita (Osaka University, Kobe University) | 2011 | J. Condensed Matter Nuclear Science 4 (1): 56-68 (2011), DOI 10.70923/001c.72142 | twin hydrogen-absorption system with heat measurement and charged-particle diagnostics | 0.1 micrometer palladium powder, palladium black, mixed oxides Pd-Zr, Pd-Ni-Zr, Ni-Zr | deuterium/hydrogen gas absorption; loading ratio and absorption energy increase with surface fineness | pressurized H2 or D2 gas absorption onto heated nano-powder | high-pressure gas exposure; repeated bake-hydrogenation cycles | the authors report hydride-formation energies of 1.5 to 2.3 eV per D (1.5 to 2.0 eV per H) after artificial re-oxidation, and intermittent positive heat output in the post-deuteride phase when samples were charged with D2 only |
| T. Hioki, H. Azuma, T. Nishi, A. Itoh, S. Hibi, J. Gao, T. Motohiro (Toyota Central R&D Labs), J. Kasagi (Tohoku University) | 2011 | J. Condensed Matter Nuclear Science 4 (1): 69-80 (2011), DOI 10.70923/001c.72143 | Sieverts-type absorption measurement plus flow calorimetry under pressurization | palladium nanopowder 10-20 nm; palladium on gamma-alumina (Pd/gamma-Al2O3) with 2-5 nm palladium particles | gas loading at 1 MPa; absorption capacity slightly below bulk palladium; negligible H-D isotope effect in capacity | pressurization with H2 or D2 up to 1 MPa at elevated temperature | repeated runs without air exposure; two-stage heat evolution observed | the authors report first-stage heat explained by water-formation and deuteride-formation chemistry, and intermittent small heat power in the second stage (constant 1 MPa hold), observed frequently with D2 loading |
| A. Kitamura, Y. Miyoshi, H. Sakoh, A. Taniike, Y. Furuyama, A. Takahashi, R. Seto, Y. Fujita, T. Murota, T. Tahara (Kobe University, Technova Inc.) | 2014 | J. Condensed Matter Nuclear Science 13 (1): 277-289 (2014), DOI 10.70923/001c.72257 | gas-phase hydrogen isotope absorption with silica-inclusion of the active powder for reusability | palladium nanopowder in porous silica (PSII) and palladium-nickel nanocomposite (PNS) | repeated hydrogenation-oxidation cycles on the same sample charge | H2 or D2 gas absorption at elevated temperature | many-cycle operation including forced oxidation between runs | the authors report that absorption parameters persist across repeated runs and point to a role of admixed minority atoms (palladium or nickel on nickel or palladium hosts) in the heat behavior |
| A. Kitamura, A. Takahashi, R. Seto, Y. Fujita, A. Taniike, Y. Furuyama (Kobe University, Technova Inc.) | 2015 | Current Science 108 (4): 589-593 (2015) | mass-flow calorimetry system for nano-composite metal powders under gas charging | nickel-based and palladium-based nano-composites on oxide supports | D2 or H2 gas charging of the powder bed | gas charging with electrical heating of the reaction chamber | oil mass-flow calorimetry around the reaction chamber | the authors report their calorimetry method and anomalous heat effect results for nano-composite metals under D(H)-gas charging (summary paper) |
| A. Kitamura, A. Takahashi, R. Seto, Y. Fujita, A. Taniike, Y. Furuyama (Kobe University, Technova Inc.) | 2016 | J. Condensed Matter Nuclear Science 19 (1): 135-144 (2016), DOI 10.70923/001c.72382 | hydrogen absorption runs in a reaction chamber with oil-flow calorimetry; binary nano-composites versus single-component controls | Pd0.016Ni0.070/SiO2 (PNSII) and Cu0.011Ni0.077/SiO2 (CNS2) on mesoporous silica; controls NiO/Ni and Ni/SiO2 | H2 absorption to metal saturation at elevated temperature | hydrogen gas absorption with heating up to 350 degrees C | elevated-temperature runs after saturation of hydrogen absorption into the metal | the authors report excess power reaching 8 W per gram palladium and 1 W per gram nickel, integrated excess energies of 3.8 keV per Pd atom (6.5 keV per H atom) and 0.6 keV per Ni atom (10 keV per H atom), observed only for the binary nano-composites and only after absorption saturation |
| A. Kitamura, A. Takahashi, K. Takahashi, R. Seto, T. Hatano, Y. Iwamura, T. Itoh, J. Kasagi, M. Nakamura, M. Uchimura, H. Takahashi, S. Sumitomo, T. Hioki, T. Motohiro, Y. Furuyama, M. Kishida, H. Matsune (Technova Inc., Tohoku University, Nissan Motor Co., Nagoya University, Kobe University, Kyushu University) | 2018 | Int. Journal of Hydrogen Energy 43: 16187-16200 (2018) | six-organization MHE collaboration experiments; oil mass-flow calorimetry with identical sample sets split between Kobe and Tohoku laboratories | zirconia- and silica-supported nano-composites: Cu-Ni-Zr oxide, Pd-Ni-Zr oxide, Cu-Ni on silica, palladium on silica | H2 or D2 gas at about 1 MPa from reservoir volumes of 1 to 2 L | gas charging plus electrical heating (sheath and cartridge heaters) | sample temperatures 150 to 350 degrees C; ambient held at 23 plus or minus 0.1 degrees C; typical sample mass 100 g in a bed of 1,300 g zirconia beads | the peer-reviewed journal version of the collaboration results; the authors report excess heat evolution from nanocomposite samples under exposure to hydrogen isotope gases |
| T. Itoh, Y. Iwamura, J. Kasagi, H. Shishido (Tohoku University) | 2017 | J. Condensed Matter Nuclear Science 24: 179-190 (2017), proceedings of ICCF20 (International Conference on Condensed Matter Nuclear Science, Sendai 2016) | nano-structured multilayer Pd/Ni surface fabricated by glow discharge; gas cell with calorimetry | palladium-nickel nano-structured multilayer on substrate | D2 or H2 gas exposure of the nano-structured surface | gas charging with sample heating | elevated-temperature gas loading | the authors report anomalous excess heat generated by interaction between the nano-structured Pd/Ni surface and D2/H2 gas |
| Y. Iwamura, T. Itoh, J. Kasagi, A. Kitamura, A. Takahashi, K. Takahashi (Tohoku University, Technova Inc.) | 2017 | J. Condensed Matter Nuclear Science 24: 191-201 (2017), proceedings of ICCF20 (Sendai 2016) | replication at Tohoku University of the Kobe gas-charging experiments with a matched calorimetry system | nickel-based binary nanocomposites (Cu-Ni-Zr oxide class) | hydrogen isotope gas charging | gas charging plus electrical heating | same class of conditions as the Kobe source experiments | the authors report replication experiments at Tohoku University on anomalous heat generation using nickel-based binary nanocomposites and hydrogen isotope gas |
| Y. Iwamura, T. Itoh, J. Kasagi (Tohoku University) with Technova Inc., Nissan Motor Co., Nagoya University, Kobe University, Kyushu University | 2019 | J. Condensed Matter Nuclear Science 29: 119-128 (2019), collaboration period October 2015 to October 2017 | six-organization collaborative campaign; new oil mass-flow calorimetry system at Tohoku; sixteen numbered experiments across Kobe, Tohoku and Kyushu | CNZ (Cu1Ni7Zr15-Ox), PNZ (Pd1Ni7Zr15-Ox), CNS (Cu1Ni10/SiO2), PSn1 (Pd in mesoporous SiO2); zirconia bead bed around 100 g samples | H2 or D2 from 1 to 2 L reservoirs at about 1 MPa | gas charging plus two heaters (1 kW sheath, 200 W cartridge) | elevated temperature 150 to 350 degrees C; chamber ambient 23 plus or minus 0.1 degrees C; runs of hundreds of hours | the authors report anomalous excess heat for all binary nano-composite samples (not for palladium-on-silica controls): maximum powers 2.5 to 25 W; released enthalpies 1.4 to 200 MJ per mol H(D); per-atom yields 15 eV/H or D up to 2.1 keV/D (PNZ6 with D2, 25 W); coincident pressure and gas-temperature burst events with CNZ and H2 (replicated), shattered zirconia beads and nanocomposite adhered to the flange after runs; matching enthalpies and powers between Kobe and Tohoku with the same samples |
| Y. Iwamura and co-workers (Tohoku University and collaborators) | 2024 | Japanese Journal of Applied Physics 63: 037001 (2024), DOI 10.35848/1347-4065/ad2622 | nano-structured multilayer metal composites in hydrogen gas; peer-reviewed consolidation of the multilayer line | multilayer nano-structured metal composites (palladium-nickel class) | hydrogen gas loading of the multilayer stack | gas charging with heating | elevated-temperature hydrogen exposure | the authors report anomalous heat generation that cannot be explained by known chemical reactions, produced by nano-structured multilayer metal composites and hydrogen gas |
| A.G. Parkhomov, E.O. Belousova (Russia) | 2016 | J. Condensed Matter Nuclear Science 19 (1): 244-256 (2016), DOI 10.70923/001c.72394 | small sealed reactors similar to the high-temperature Rossi reactor design; alumina-style body, nickel powder charge, electrical heating | nickel powder with hydrogen (his 2015 long-term test report describes the nickel powder plus lithium aluminum hydride additive charge) | hydrogen released in situ from the powder charge | resistive heating to incandescence | reactor temperatures at about 1,100 degrees C and higher; radiation monitors on the reactor during operation | the authors report excess heat at about 1,100 degrees C and higher, and that no nuclear radiation above background level was observed during the excess heat production |
The Parkhomov line begins earlier: his long-term test report of March 2015 (English translation of "Results of Long-Term Testing of the New Variant of the Rossi Thermogenerator Model") circulated the reactor recipe and test protocol that the 2016 journal paper then consolidated. A 2013 report on the E-Cat line by Levi and co-workers (arXiv:1305.3913) is the one-line E-Cat context for the Focardi-Rossi lineage and is not pursued further in this file.
Narrative
Arata and Zhang: the powder-in-vessel architecture. The double-structure cathode (1999) is the founding geometry for gas-phase powder beds: a sealed palladium vessel filled with palladium black, loaded from the outside by electrolysis, with the inner gas space sampled for helium-4. The record shows sustained heat (5 to 10 W over 2,000 hours) with helium measured in the sealed interior. The 2002 paper converts this into a materials thesis: nanometer-scale clusters absorb more than 300 percent deuterium against host atom density at room temperature, and the authors argue the reactive phase is a condensed deuterium lattice inside each cluster unit cell. The 2008 meeting abstract reports the zirconia-plus-nano-palladium powder composite delivering about 10 W for 400 hours under electrolytic loading. For us the lesson is structural, not interpretive: nanopowder beds hold extreme deuterium densities at low temperature, and a sealed inner gas volume makes the headspace itself a diagnostic.
Osaka, Kobe and the Technova MHE program: from palladium oxides to nickel binaries. The Kitamura and Takahashi line (Technova Inc., the Material Hydrogen Energy (MHE) project, with Kobe University) systematized gas loading through the 2011 to 2018 sequence. Three engineering results stand out. First, surface fineness controls both loading ratio and absorption energy: nano-oxide composites gave hydride-formation energies of 1.5 to 2.3 eV per deuterium, far above bulk palladium values, and re-oxidation restored performance after aging. Second, the heat signature separates from chemistry: the reported excess power in the 2016 binary nano-composite paper appears only after hydrogen absorption into the metal has saturated, which bounds any chemical contribution. Third, composition matters at the percent level: Pd0.016Ni0.070/SiO2 and Cu0.011Ni0.077/SiO2 produced heat while the single-component controls (NiO/Ni, Ni/SiO2) did not, at loadings up to 350 degrees C. The Toyota Central R&D Labs companion work (Hioki and co-workers, 2011) independently mapped the same two-stage heat structure with 1 MPa pressurization and flow calorimetry, and flagged the second stage (constant-pressure hold, chemistry ruled out) as the interesting one, seen most often with D2.
Tohoku replication: the strongest reproducibility record in the cluster. In 2015 Tohoku University's Research Center for Electron Photon Science and CLEAN PLANET Inc. formed a Condensed Matter Nuclear Reaction division specifically to replicate the Kobe results, built an oil mass-flow calorimeter, and ran the same sample classes at both sites (2017 and 2019 papers, sixteen numbered experiments). The record shows matched enthalpies and powers between laboratories, a clear control contrast (binary nano-composites heat, palladium-on-silica controls do not), per-atom energies from 15 eV/H or D to 2.1 keV/D, and a replicated burst signature: coincident chamber-pressure and gas-temperature spikes with CNZ and H2, plus post-run evidence of local mechanical damage (shattered zirconia beads, powder welded to the flange). The 2024 Japanese Journal of Applied Physics paper consolidates the multilayer line in a mainstream journal.
Focardi, Habel and Piantelli: the nickel-hydrogen rod. The 1994 Nuovo Cimento A paper is the root of the nickel-hydrogen line: a hydrogen-loaded nickel rod held at temperature, with about 50 W of anomalous heat reported against electrical input. The line later fed the E-Cat device demonstrations (one-line context, see above). For our program, nickel is the cheap, hydrogen-side sister system to palladium-deuterium: same gas-loading logic, far lower materials cost, as the Parkhomov reactors (nickel powder plus in-situ hydrogen release, 1,100 degrees C and higher, no radiation above background reported) also demonstrate.
Carry into device
- Architecture: sealed powder beds beat open electrolytic cells for our program. The Arata-Zhang double-structure geometry (powder charge inside a sealed metal body with a sampling headspace) maps directly onto our stage-two dry-bed variant, and the headspace doubles as a helium-4 and residual-gas diagnostic port.
- Materials leverage: binary nano-composites on oxide supports (Ni-Cu-Zr oxide, Pd-Ni-Zr oxide, Cu-Ni on silica) are the composition class with the strongest gas-loading heat record and a built-in control contrast (single-component analogs reported inert). Our suspension should carry at least one binary nano-composite powder and its single-component twin as the paired control.
- Surface state is a reusable handle: artificial re-oxidation restored hydride-formation energies (1.5 to 2.3 eV/D) after aging in the Osaka data. We should specify oxidation state, and plan periodic re-oxidation-hydriding cycles to refresh the powder.
- Saturation-first protocol: heat appears after metal-hydride absorption saturates, so every run must have a documented chemical first stage (absorption enthalpy) before the post-saturation window is analyzed. This mirrors the brief's pre-registered threshold discipline.
- Burst detection: the replicated coincident pressure-plus-temperature bursts at Tohoku (with post-run shatter and welding evidence) argue for high-bandwidth pressure and multi-point temperature logging in our cell, not just slow calorimetry.
- Calorimetry: oil mass-flow calorimetry at 23 plus or minus 0.1 degrees C ambient, with blank runs on zirconia beads to fix the heat-recovery rate, is the proven measurement chain for 100 g-class powder beds at 150 to 350 degrees C. Copy it for our stage-two dry-bed calorimeter.
- Isotope contrast: the D2-versus-H2 contrast recurs across the cluster (Hioki's second-stage heat mostly with D2; Kitamura 2016 heat on H2 after saturation; Iwamura 2019 on both). Our device matrix must run both gases per composition.
- Cost path: nickel and copper binaries at roughly 350 degrees C with H2 put the cheap end of the phase space at commodity prices (estimate), while palladium-deuterium remains the high-mobility reference composition.