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1. Purifying Hydrogen from Dilute Hydrogen–Natural Gas Mixtures Using HT-PEM Electrochemical Hydrogen Pumps

   https://doi.org/10.1021/acsenergylett.4c00746  

   Arunagiri, Karthik; Turssline, John M; Arges, Christopher G (May 2024, ACS Energy Letters)

   Reducing the cost of hydrogen transport is an important priority for the proliferation of clean hydrogen to decarbonize the economy. It is possible to alleviate the hydrogen transportation costs by delivering them via existing natural gas pipeline infrastructure. This strategy, however, necessitates the dilution of hydrogen by blending it with natural gas as hydrogen embrittlement pipeline materials. In this work, we deploy high-temperature polymer electrolyte membrane electrochemical hydrogen pumps (HT-PEM EHPs) to purify hydrogen from dilute hydrogen–natural gas mixtures (5 to 20 vol % hydrogen). Interestingly, we observe that activation overpotentials govern HT-PEM EHP polarization when feeding dilute hydrogen mixtures. Pressurizing the anode to 1.76 barabs enables us to ameliorate interfacial mass transfer resistance and achieve an EHP limiting current density of 1.4 A cm–2 with a 10 vol % of hydrogen in a natural gas feed. The HT-PEM EHP showed a small degradation rate, 44 μV h–1, during a 100 h durability test. 

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2. Metallic Hydrogen

   https://doi.org/10.37282/991819.21.44  

   Silvera, Isaac; Dias, Ranga (July 2021, Inference: International Review of Science)

   null (Ed.)

   For over eighty years, scientists have been trying to produce lab-made metallic hydrogen, the holy grail of alternative fuels. In that process, diamond anvils must withstand pressures greater than those at the center of the earth—no mean feat. Recent research may have finally achieved hydrogen’s metallic state. All that remains is for another lab to reproduce the results. 

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3. Phases of the hydrogen isotopes under pressure: metallic hydrogen

   https://doi.org/10.1080/23746149.2021.1961607  

   Silvera, Isaac F.; Dias, Ranga (January 2021, Advances in Physics: X)

   null (Ed.)
4. Studies of Hydrogen Atom Recombination in Solid Hydrogen Deuteride

   https://doi.org/10.1007/s10909-025-03281-8  

   Wetzel, C K; Lee, D M; Sheludiakov, S; Ahokas, J; Vasiliev, S; Khmelenko, V V (March 2025, Journal of Low Temperature Physics)

   We used the method of electron spin resonance (ESR) to investigate the temperature-dependent recombination rate of H atoms in solid molecular hydrogen deuteride (HD). A 1.5 휇m thick solid molecular HD film was deposited at a rate of 2 monolayer/s, onto a gold surface maintained at T=1.5 K. H and D atoms were accumulated in the film by maintaining radio-frequency electric discharge above the film for 19 days. After further storage of the sample for 48 h, at T < 1 K, the D atom signal vanished. The concentration of H atoms was monitored as the sample was warmed stepwise from 1.1 K to 2.8 K. The recombination rate of H atoms in solid HD was found to be proportional to temperature in this range. 

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5. Studies of nuclear polarization of hydrogen atoms embedded in solid molecular hydrogen and hydrogen deuteride films

   https://doi.org/10.1063/10.0000532  

   Sheludiakov, S.; Lee, D. M.; Khmelenko, V. V.; Ahokas, J.; Järvinen, J.; Vasiliev, S. (February 2020, Low Temperature Physics)