High Hydrogen Adsorption Research Articles

Double‐Walled Honeycomb‐Like Metal‐Organophosphonium Framework with High H2 Gas Adsorption Capacities

AbstractThis study successfully synthesized a new Metal‐Organic Framework (MOF) named CJLU−L2, which was constructed from phosphorus‐containing ligands and Co(II) ions. The structure revealed through single‐crystal X‐ray diffraction (SCXRD), features a double‐walled honeycomb‐shaped structure with a one‐dimensional channel of ~6.5 Å. According to the PLATON calculation, the pore volume per unit cell of CJLU−L2 was determined to be 6825.0 Å3, constituting 57.5 % of the total crystal volume (11874.9 Å3). The Brunauer‐Emmett‐Teller (BET) surface area of CJLU−L2 was determined to be 954 m2/g by N2 adsorption measurement at 77 K. The phase purity of CJLU−L2 was verified by powder X‐ray diffraction (PXRD) and infrared spectroscopy (IR), while its thermal stability was confirmed by thermogravimetric analysis (TGA). Hydrogen adsorption experiments demonstrate that CJLU−L2 exhibits a high hydrogen adsorption capacity, indicating significant potential for gas adsorption applications.

Novel Graphene-Based Reversible Physisorption Materials for High Hydrogen Uptake

Carbon-based nanomaterials (graphene, carbon nanotube, microporous carbon, graphitic carbon etc.) are excellent H2 storage materials due to high molecular H2 uptake at the micropores and large H2 adsorption at the graphene network via the formation of dipoles in H2 molecules through London dispersion forces. On the other hand, incorporation of transition metal nanoparticles within the nanocarbon network facilitates dissociation of H2 molecules into constituents H-atoms over the metal nanoparticles, followed by diffusion into the carbon nano-matrix via ‘spill-over’ effect for polarization/hybridization of metal-hydrogen to create high H2 binding energy for high hydrogen adsorption. Therefore, a nanocomposite of graphene-microporous carbon-metal nanoparticle network is expected to deliver excellent H2 uptake capacity and acts as a novel reversible physisorption material for hydrogen storage applications, which is very important for sustainable renewable energy integration.A simple, cost effective sputtering method is used to fabricate metal incorporated graphitic microporous carbon film and differential resistance measurement showed high H2 uptake. Average number of graphene layer formation is dependent on sputtering parameters, which manifest bi-to-multilayer graphene. With increase in graphene layers, H2 adsorption also increases due to a fourfold effect: higher molecular hydrogen uptake at the graphene layers, more active sites into the micropores, promotion of molecular dissociation into atomic hydrogen by the metal nanoparticles, and the formation of hydrogenated carbon via destruction of the π-bonds.

Interface and Electronic Structure Regulation of RuO2 through Ru/RuO2 Heterointerface Construction and Zn Atom‐Doping for High‐Performance Overall Water Splitting in Both Alkaline and Acidic Media

AbstractRational design and fabrication of efficient catalysts for overall water splitting in an integrated electrolyzer are essential for energy storage and conversion. Herein, an ultra‐small substitutional Zn‐doped Ru/RuO2 heterostructure (5.6 nm) is synthesized through a facile pyrolyzing strategy as an efficient bi‐functional electrocatalyst for water splitting in both acidic and alkaline media. Experiments demonstrate that introducing appropriate alien atoms into RuO2 with an amorphous state can effectively optimize the electron structure and expose abundant defects, and thus increasing the number of active sites and improving the intrinsic activity of RuO2 for the oxygen evolution reaction (OER). In addition, the high hydrogen adsorption capability of metallic Ru makes Ru‐RuO2 heterointerface suitable for water splitting. Notably, the Ru/ZnRuO2 displays low overpotentials at 10 mA cm−2 with only 184 mV for OER in 0.5 m H2SO4 and 35 mV for HER in 1.0 m KOH. Besides, the as‐synthesized Ru/ZnRuO2 displays cell voltages of 1.540 and 1.567 V (at 10 mA cm−2) for water splitting with remarkable durability for more than 220 and 100 h, respectively, in acidic and alkaline media. This work provides a facile strategy for designing pH‐universal electrocatalysts toward overall water splitting.

Lithium Fluoride Enhanced Platinum Catalytic Exchange of Hydrogen Isotopes by High Hydrogen Adsorption at Low Temperature

AbstractThe catalytic exchange of hydrogen isotopes is a promising technology for purifying recycled water in nuclear power stations. However, it remains a challenge for achieving high catalytic efficiency and stability at low temperatures. In this work, we propose a facile strategy to enhance the catalyst efficiency by introducing LiF in the Pt/Ti3AlC2 (Pt−5‐LiF/Ti3AlC2). The incorporation of LiF significantly achieves high catalytic exchange efficiency of 92 % and a turnover frequency of 28.1 h−1, which are more than twice that of Pt/Ti3AlC2. The structure‐activity relationship analysis reveals that the introduction of LiF substantially enhanced the hydrogen adsorption capacity of the catalyst and further improved the performance of the catalysts. Moreover, this LiF‐added strategy is also applicable to other Pt‐based catalysts such as Pt/Al2O3 and Pt/activated carbon. This work provides a novel catalyst design strategy for high‐efficiency catalytic exchange of hydrogen isotopes.

Effect of Ni doping on methane removal from hydrogen in ZrMnFe alloy and mechanism analysis

Getter alloy has the advantages of low cost and high hydrogen purity in small and medium-scale hydrogen purification. However, the commonly used ZrMnFe alloy is reactive to various impurities in hydrogen, and requires a temperature above 600 °C to remove methane. To improve reactivity with methane and ensure a high hydrogen adsorption platform pressure, partial substitution of Fe with Ni, which has a smaller bonding energy with methane ligand, is beneficial. In this work, we prepared ZrMnFeNi alloys with different Ni stoichiometric ratios by suspension induction melting and investigated their performance in purifying hydrogen containing trace amounts of methane. All alloys maintain C14 Laves phase, and the interplanar spacing of the (103) crystal planes decreases with the replacement of Ni. It is proved that ZrMnFeNi alloys can significantly improve the absorb efficiency of methane in hydrogen and reduce the removal temperature. At 450 °C, ZrMnFe0.7Ni0.3 can remove 10 ppm methane to 0.124 ppm. The purification efficiency of hydrogen at 450 °C can reach 96.94%, while the purification efficiency of ZrMnFe alloy is only 27.12%. The ZrMnFe0.7Ni0.3 alloy decomposes methane into carbon and hydrogen during purification, and the carbon diffuses into the alloy at high temperature to form a metal carbide with zirconium. The XPS results show that the electron-rich state of Ni is more beneficial for activating the C–H bond breaking of methane.

Hydrogen sorption studies of palladium decorated graphene nanoplatelets and carbon samples

With the increasing population of the world, the need for energy resources is increasing rapidly due to the development of the industry. 88% of the world's energy needs are met from fossil fuels. Since there is a decrease in fossil fuel reserves and the fact that these fuels cause environmental pollution, there is an increase in the number of studies aimed to develop alternative energy sources nowadays. Hydrogen is considered to be a very important alternative energy source due to its some specific properties such as being abundant in nature, high calorific value and producing only water as waste when burned. An important problem with the use of hydrogen as an energy source is its safe storage. Therefore, method development is extremely important for efficient and safe storage of hydrogen. Surface area, surface characteristics and pore size distribution are important parameters in determining the adsorption capacity, and it is needed to develop new adsorbents with optimum parameters providing high hydrogen adsorption capacity. Until recently, several porous adsorbents have been investigated extensively for hydrogen storage. In this study, it was aimed to develop and compare novel Pd/carbon, Pd/multiwalled carbon nanotube, and Pd/graphene composites for hydrogen sorption. All the palladium/carbon composites were characterized by t-plot, BJH desorption pore size distributions, N2 adsorption/desorption isotherms, and SEM techniques. The maximum hydrogen storage of 2.25 wt.% at −196 °C was achieved for Pd/KAC composite sample. It has been observed that the spillover effect of palladium increases the hydrogen sorption capacity.

Synergistic material modification-induced optimization of interfacial charge transfer and surface hydrogen adsorption.

Being chemically stable, low cost and made from abundant resources, titanium dioxide (TiO2) possesses the most desired advantages for photocatalytic applications. However, the intrinsic limits of high surface hydrogen adsorption energy, wide band gap, low separation rate and rapid recombination of the photogenerated charge carriers greatly hamper its utilization. To address these issues, the present work combines density functional theory (DFT) calculations with rational modifications of TiO2 with nickel doping and an ultra-thin shield of fluorinated carbon (FNT) for application in the photocatalytic hydrogen evolution reaction (HER). Comprehensive studies imply that the synergistic modifications not only optimize the surface H adsorption, but also facilitate the interfacial charge transfer and simultaneously prevent the photochemical and chemical corrosion of the catalysts. In good agreement with the theoretical predictions, the resulting FNT photocatalysts demonstrate an optimal HER efficiency of 13.0 mmol g-1 h-1, nearly 33-times and over three-times beyond that of the pristine TiO2 (0.4 mmol g-1 h-1) and the Ni-doped TiO2 (4.2 mmol g-1 h-1), respectively. Moreover, the composite also exhibits excellent stability with a well-reproducible HER performance over a 66-hour cyclic HER test of 15 cycles.

Machine-learning-based prediction of hydrogen adsorption capacity at varied temperatures and pressures for MOFs adsorbents

BackgroundMetal-organic frameworks (MOFs) have been recently studied as promising hydrogen storage adsorbents. However, large-scale screening by experiments is infeasible. Machine learning and Grand Canonical Monte Carlo (GCMC) have been widely applied in the screening of MOFs to greatly improve efficiency. MethodsGCMC was applied to 418 MOFs to calculate structural and performance parameters, and the gradient boosted regression (GBR) machine learning algorithm was used to predict the hydrogen adsorption capacity at cryogenic temperatures and high pressures from room temperatures and low pressures, and the database was extended to 8024 MOFs adsorbents based on the established ML model. The influencing factors affecting hydrogen adsorption capacity were comprehensively evaluated, and four representative MOFs were randomly selected for hydrogen adsorption isotherm testing, and the accuracy of ML was verified by comparing the GCMC simulation results with those predicted by ML. Significant findingsThe accuracy of the ML model is acceptable, with the coefficient of determination (R2) of the train all exceeding 0.9 and the test R2 all exceeding 0.85. The MOFs exhibiting high hydrogen adsorption capacity by low-pressure adsorption have low pore size, Henry's constants, and density, and the metal-based is Al-based and Zn-based, while the surface area dominates at high-pressure adsorption. The experimentally tested MOFs with hydrogen adsorption capacity compared with GCMC simulation and ML models have an error of 1.01% in the low-pressure region and 1.49% in the high-pressure region.

Porous carbon materials with improved hydrogen storage capacity by carbonizing Zn(BDC)TED0.5

Metal-organic frameworks (MOFs) have promising application prospects in the field of hydrogen storage. However, the application of many MOFs with high hydrogen adsorption capacity is limited by their poor water stability. Herein, a porous carbon material with high hydrogen storage capacity as MOFs and stability is obtained by a simple carbonization method using a series of Zn(BDC)TED0.5 (MOFs) with different ligands (-OH, –NH2 and –CH3) modified as a material. The results of the XRD, SEM, ICP and gas adsorption results showed that the Zn atoms in Zn(BDC)TED0.5 can be removed by carbonization to form porous carbon materials with well-developed pore structures. The carbonized Zn(BDC-CH3)TED0.5 exhibited the best hydrogen storage capacity of 1.91 ​wt% at 77 ​K and 1 ​bar, which was 23% higher than that of Zn(BDC)TED0.5. The promotion of storage capacity can be attributed to the aperture structure of the porous carbon material with a more suitable adsorption performance of hydrogen, which is derived from the intrinsic structure of MOFs. At the same time, the carbonized samples also have good water and chemical stability, which can maintain their gas adsorption capacity even after being immersed in high-concentration hydrochloric acid for several days.

Co-anion exchange prepared 2D structure Ni(Co,Fe)PS for efficient overall water electrolysis

Two-dimensional (2D) Ni alloy catalysts have attracted significant attention for alkaline overall water electrolysis owing to their facile oxidation state changes and long-term stability. However, their low hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) performances owing to their non-optimized hydrogen, water, and hydroxide ion adsorption energies, compared to those of noble metal catalysts, have limited their further application. To address these issues, in this study, we synthesized a 2D-structured Ni(Co,Fe)PS using a co-ion (P and S) exchange method. The synthesized 2D-structured Ni(Co,Fe)PS utilized the averaging effect of the combination of sulfide, which exhibits high hydrogen and water adsorption energies, and phosphide, which exhibits a relatively low hydrogen and water adsorption energy. During a HER process, the synthesized NiCoPS exhibited a lower overpotential (61 mV) compared to NiCoP (75 mV) and NiCoS (66 mV) for the generation of a current density of 10 mA·cm−2, and a low Tafel slope value of 44.5 mV·dec-1. In addition, the charge transfer resistance of the NiCoPS catalyst (5 Ω) was significantly lower than those of NiCoP (12.1 Ω) and NiCoS (14.3 Ω). As an alkaline OER catalyst, NiFePS exhibited a lower overpotential (242 mV) for the generation of a current density of 10 mA·cm−2 compared to NiFeP (250 mV) and NiFeS (260 mV), and a remarkably low Tafel slope value of 38.0 mV·dec-1. The charge transfer resistance of NiFePS (1.5 Ω) was significantly lower than those of NiFeP (4.2 Ω) and NiFeS (4.9 Ω). An overall water splitting (OWS) catalyst system was fabricated by combining the NiCoPS and NiFePS catalysts, and OWS system required an overpotential of only 1.54 V for the generation of a current density of 10 mA·cm−2, which is significantly lower than those required by previously reported transition metal-based phosphide catalysts. This study presents a new method to develop highly efficient HER and OER catalysts via a simple co-ion exchange of 2D-structured Ni-alloy layered double hydroxides.

Boron Nitride Nanotube (BNNT) Membranes for Energy and Environmental Applications.

Owing to their extraordinary thermal, mechanical, optical, and electrical properties, boron nitride nanotubes (BNNTs) have been attracting considerable attention in various scientific fields, making it more promising as a nanomaterial compared to other nanotubes. Recent studies reported that BNNTs exhibit better properties than carbon nanotubes, which have been extensively investigated for most environment-energy applications. Irrespective of its chirality, BNNT is a constant wide-bandgap insulator, exhibiting thermal oxidation resistance, piezoelectric properties, high hydrogen adsorption, ultraviolet luminescence, cytocompatibility, and stability. These unique properties of BNNT render it an exceptional material for separation applications, e.g., membranes. Recent studies reported that water filtration, gas separation, sensing, and battery separator membranes can considerably benefit from these properties. That is, flux, rejection, anti-fouling, sensing, structural, thermal, electrical, and optical properties of membranes can be enhanced by the contribution of BNNTs. Thus far, a majority of studies have focused on molecular simulation. Hence, the requirement of an extensive review has emerged. In this perspective article, advanced properties of BNNTs are analyzed, followed by a discussion on the advantages of these properties for membrane science with an overview of the current literature. We hope to provide insights into BNNT materials and accelerate research for environment-energy applications.

Ni–La2O3 cermet hydrogen electrode originating from the in-situ decomposition of the La2NiO4+δ oxide for quasi-symmetrical solid oxide fuel cells

Ni–La2O3 cermet hydrogen electrode having almost no ionic conductivity still exhibits excellent electrochemical performance owing to the hydrogen spillover process from high hydrogen adsorption capability on the La2O3 surface. In this work, we develop Ni–La2O3 cermet hydrogen electrode originating from the in-situ decomposition of the La2NiO4+δ(LNO) oxide, and then perform the electrochemical properties for quasi-symmetrical solid oxide fuel cells (Q-SSOFCs), which own YSZ electrolyte support wrapped GDC barrier layer. The area specific resistance (ASR) of LNO air electrode increases from 2.09 to 7.41 Ω cm2, with the temperature of decreasing from 800 to 600 °C. The electrochemical performances of Q-SSOFCs with Ni–La2O3 cermet hydrogen electrode and LNO air electrode are characterized, and the values of the peak power density and the electrode polarization resistance (Rp) of the symmetrical electrodes measured at 800 °C are 245.18 mW cm−2 and 0.61 Ω cm2. These results indicate that the hydrogen spillover process of Ni–La2O3 cermet hydrogen electrode can greatly promote the hydrogen oxidation reaction.

Improved hydrogen adsorption of ZnO doped multi-walled carbon nanotubes

Hydrogen storage is still one of the most important problems to improve hydrogen energy usage widespread. New materials capable of storing hydrogen with high efficiency must be introduced to overcome this problem. In recent years, addition of metals or inorganic compounds to multiwalled carbon nanotubes (MWCNTs) has been generally used for hydrogen uptake studies to enhance adsorption property of the nanotubes. In this study, Zinc oxide (ZnO) nanoparticles doped MWCNTs (ZnO-MWCNTs) have been produced as new reversible hydrogen storage materials, and we have investigated characterization of ZnO-MWCNTs by XRD, SEM, TGA, TEM and BET analyses. The functionalized MWCNTs and ZnO doped MWCNTs were subjected to hydrogenation step by dynamic gas sorption analyser under pressure of 5–50 bar. The hydrogen uptake capacities of the materials under different pressures were measured gravimetrically. It was indicated that by controlling the pressures for hydrogenation of ZnO-MWCNTs induces the spillover of ZnO nanoparticles in the layer of MWCNTs which in return with high hydrogen adsorption capacity. Consequently, the hydrogen adsorption of the functionalized MWCNTs (f-MWCNTs) and the ZnO-MWCNTs were achieved to be 1.05 wt% and 2.7091 wt% under pressure of 50 bar as maximum.

Fabrication of Pd/ Ni Alloy Nanotubes Via Electrospinning for High Performance Hydrogen Detection

Hydrogen is one of the most important “next generation energy sources”, which is free for environment pollution, with water as the only emission. Due to the danger of hydrogen explosion when mixed with air, as well as the low specific heat capacity of hydrogen, the temperature required for combustion can be reached immediately even a little heat absorbed. Therefore, it’s necessary to search an effective way to monitor hydrogen leakage at room temperature.In this study, the Pd based hydrogen sensor was investigated. During the transduction process, volumetric expansion occurred due to the hydrogen absorption at room temperature to achieve safe hydrogen detection. Previous research indicated that Pd/Ni alloy films/ nanofibers can achieve higher catalytic activity, stability and sensitivity than pure Pd films/nanofibers due to the synergistic effect between Pd and Ni 1 ,2,3 . But both the films and nanofibers structures have limited specific surface area and therefore limited exposed hydrogen adsorption sites. To overcome these problems, we fabricated the porous Pd nanotubes alloyed with Ni by using Polyvinylpyrrolidone (PVP) and SiO2 templates electrospinning route, then the PVP and SiO2 templates were selectively removed by calcination and etching 4 , respectively. The sensing performance was measured by monitoring the resistance curves of sensing platform at various hydrogen concentrations. Compared to Pd/Ni nanofibers structures, tubular structures achieved lower LOD and higher sensitivity which are attributed to the high surface area and abundant hydrogen adsorption active sites. High performance Pd/Ni nanotubes can be successfully fabricated in an effective and facile approach for hydrogen detection at room temperature. At last, the effects of the concentration of Ni in Pd on the sensing performance was also investigated.

Adsorption and Diffusion of Hydrogen in Carbon Honeycomb.

Carbon honeycomb has a nanoporous structure with good mechanical properties including strength. Here we investigate the adsorption and diffusion of hydrogen in carbon honeycomb via grand canonical Monte Carlo simulations and molecular dynamics simulations including strength. Based on the adsorption simulations, molecular dynamics simulations are employed to study the effect of pressure and temperature for the adsorption and diffusion of hydrogen. To study the effect of pressure, we select the 0.1, 1, 5, 10, 15, and 20 bars. Meanwhile, we have studied the hydrogen storage capacities of the carbon honeycomb at 77 K, 153 K, 193 K, 253 K and 298 K. A high hydrogen adsorption of 4.36 wt.% is achieved at 77 K and 20 bars. The excellent mechanical properties of carbon honeycomb and its unique three-dimensional honeycomb microporous structure provide a strong guarantee for its application in practical engineering fields.

Ni-Co nanocomposites deposited on carbon fiber paper as an electrocatalyst towards hydrogen evolution reaction

Abstract Nickel (Ni), cobalt (Co) and Ni-Co nanosheets were successfully grown on carbon fiber paper (CFP) via hydrothermal method for hydrogen evolution reaction (HER). The interconnected Ni, Co and Ni-Co nanosheets have thickness in the range of 8.42 to 21.78 nm. However, all samples are poorly crystalline as evident from their diffused diffraction patterns. The Ni-Co nanocomposite exhibited the largest HER activity having the lowest overpotential of -0.313 V (vs RHE) at a current density of 10 mA/cm2, compared to pure Ni and Co samples having overpotential values of -0.632 V (vs RHE) and -0.441 V (vs RHE), respectively. This is attributed to the synergistic effect between the intrinsic HER catalytic property of Ni and high hydrogen adsorption of Co

Polymer-Based Shaping Strategy for Zeolite Templated Carbons (ZTC) and Their Metal Organic Framework (MOF) Composites for Improved Hydrogen Storage Properties.

Porous materials such as metal organic frameworks (MOFs), zeolite templated carbons (ZTC), and some porous polymers have endeared the research community for their attractiveness for hydrogen (H2) storage applications. This is due to their remarkable properties, which among others include high surface areas, high porosity, tunability, high thermal, and chemical stability. However, despite their extraordinary properties, their lack of processability due to their inherent powdery nature presents a constraining factor for their full potential for applications in hydrogen storage systems. Additionally, the poor thermal conductivity in some of these materials also contributes to the limitations for their use in this type of application. Therefore, there is a need to develop strategies for producing functional porous composites that are easy-to-handle and with enhanced heat transfer properties while still retaining their high hydrogen adsorption capacities. Herein, we present a simple shaping approach for ZTCs and their MOFs composite using a polymer of intrinsic microporosity (PIM-1). The intrinsic characteristics of the individual porous materials are transferred to the resulting composites leading to improved processability without adversely altering their porous nature. The surface area and hydrogen uptake capacity for the obtained shaped composites were found to be within the range of 1,054–2,433 m2g−1 and 1.22–1.87 H2 wt. %, respectively at 1 bar and 77 K. In summary, the synergistic performance of the obtained materials is comparative to their powder counterparts with additional complementing properties.

Thermal effects on hydrogen storage capacity of Pd/MWCNT nanoparticles deposited at moderate pressure and temperature supercritical carbon dioxide conditions

Pd nanoparticles were deposited on MWCNT support for the first time at 80 ℃ and under 2500 psi scCO2 conditions via a bipyridyl precursor in the absence co-solvent. After deposition, the samples were heated under different atmospheres. Then their morphological and hydrogen uptake capacities were investigated. An average particle size between 7−9 nm was estimated via HR-TEM images while intense Pd(111) and Pd(200) sites were detected for all heated samples except no thermally treated one which exhibits PdHx sites. The highest hydrogen adsorption at room temperature was recorded for the samples heated under oxygen. At room temperature, Pd loading amount was found to be effective in means of captured hydrogen. Hence, at higher temperatures, hydrogen uptake of samples treated under nitrogen atmosphere was higher. Additionally, in case of the sample which was not thermally treated, a signal referring to hydrogen release between 200−300 °C during reduction was detected.

Effect of in-situ boron doping on hydrogen adsorption properties of carbon nanotubes

Floating catalyst chemical vapor deposition method was used for the synthesis of boron doped carbon nanotubes (BCNTs) using ethanol, triethyl borate and ferrocene as carbon source, boron source and catalyst precursor, respectively. The synthesized BCNTs were characterized by transmission electron microscopy, Raman spectroscopy, thermogravimetric analysis and X-ray photoelectron spectroscopy (XPS). The hydrogen adsorption activity was studied for BCNTs along with undoped single walled and multi walled carbon nanotubes. Significant enhancement in the hydrogen storage value was found in doped CNTs as compared to the other undoped CNTs. Hydrogen storage for BCNTs was found to be 2.5 wt% at 10 bar and 77 K. In-situ doped BCNTs gives higher hydrogen adsorption as compared to ex-situ doped BCNTs. The Langmuir adsorption isotherm was found to be suitable for describing the adsorption isotherm as compared with Freundlich isotherm. Maximum adsorption capacity was about 9.8 wt% at 77 K. Pseudo second order kinetics was followed by BCNTs for hydrogen adsorption.

Adsorption of Hydrogen in Microporous Carbon Adsorbents of Different Origin

Adsorption of hydrogen in four types of activated carbons of different origin with specific micropore volumes ranging from 0.46 to 0.96 cm3/g is studied at temperatures of 303, 313, 323, and 333 K and pressures up to 20 MPa. The saturation adsorption of hydrogen vapors in the considered types of activated carbons is calculated at the hydrogen boiling point (20.38 K) and a pressure of 0.101 MPa using the Dubinin theory of volume filling of micropores (TVFM). The theoretical calculations show that the type FAS-2008 adsorbent, which is produced using liquid-phase furfural polymerization, has the highest adsorption capacity. Using the TVFM and taking into account linearity of the adsorption isosteres, we also estimate adsorption of hydrogen in the type AU3:5 slit-shaped microporous carbon adsorbent at a temperature of 303 K and pressures 10 and 20 MPa. The collected experimental data and theoretical calculations are compared to the data for 101 kPa and 20.38 K. The highest hydrogen adsorption, 7.9 wt %, at 20 MPa and 303 K is predicted for a model slit-shaped microporous graphene-based adsorbent, type AU3:5.