CO2 Desorption Research Articles

Steering the Absorption Configuration of Intermediates over Pd-Based Electrocatalysts toward Efficient and Stable CO2 Reduction.

Palladium (Pd) catalysts are promising for electrochemical reduction of CO2 to CO but often can be deactivated by poisoning owing to the strong affinity of *CO on Pd sites. Theoretical investigations reveal that different configurations of *CO endow specific adsorption energies, thereby dictating the final performances. Here, a regulatory strategy toward *CO absorption configurations is proposed to alleviate CO poisoning by simultaneously incorporating Cu and Zn atoms into ultrathin Pd nanosheets (NSs). As-prepared PdCuZn NSs can catalyze CO production at a wide potential window (-0.28 to -0.78 V vs RHE) and achieve a maximum FECO of 96% at -0.35 V. Impressively, it exhibits stable CO production of 100 h under ∼95% FECO with no decay. Combined results from X-ray analysis, in situ spectroscopy, and theoretical simulations suggest that the codoping strategy not only optimizes the electronic structure of Pd but also weakens the binding strengths of *CO and increases the proportion of weak-binding linear *CO absorption configuration on catalysts' surfaces. Such targeted adoption of weakly bound configurations abates the energy barrier of *CO desorption and facilitates CO production. This work confers a useful design tactic toward Pd-based electrocatalysts, codoping for steering adsorption configuration to achieve highly selective and stable CO2-to-CO conversion.

Copper‐Catalysed Electrochemical CO2 Methanation via the Alloying of Single Cobalt Atoms

AbstractThe electrochemical reduction of carbon dioxide (CO2) to methane (CH4) presents a promising solution for mitigating CO2 emissions while producing valuable chemical feedstocks. Although single‐atom catalysts have shown potential in selectively converting CO2 to CH4, their limited active sites often hinder the realization of high current densities, posing a selectivity‐activity dilemma. In this study, we developed a single‐atom cobalt (Co) doped copper catalyst (Co1Cu) that achieved a CH4 Faradaic efficiency exceeding 60 % with a partial current density of −482.7 mA cm−2. Mechanistic investigations revealed that the incorporation of single Co atoms enhances the activation and dissociation of H2O molecules, thereby lowering the energy barrier for the hydrogenation of *CO intermediates. In situ spectroscopic experiments and density functional theory simulations further demonstrated that the modulation of the *CO adsorption configuration, with stronger bridge‐binding, favours deep reduction to CH4 over the C−C coupling or CO desorption pathways. Our findings underscore the potential of Co1Cu catalysts in overcoming the selectivity‐activity trade‐off, paving the way for efficient and scalable CO2‐to‐CH4 conversion technologies.

The Effect of the Metal Oxide as the Support for Silver Nanoparticles on the Catalytic Activity for Ammonia Ozonation

Ammonia is one of the common inorganic pollutants in surface waters. It can come from a wide range of sources through the discharge of wastewater (industry, agriculture, and municipal waters). Catalytic ozonation reaction can efficiently remove ammonia nitrogen without introducing other pollutants and improve the nitrogen selectivity of reaction products by controlling the reaction conditions. Catalysts based on silver nanoparticles (Ag NPs) have shown excellent O3 decomposition performance; therefore, they are promising catalysts for catalytic ammonia ozonation due to their high reactivity, stability, and selectivity to N2. In this study, we synthesized well-defined silver nanoparticles (Ag NPs) using a modified alkaline polyol method and then dispersed them on solid oxide supports (Fe3O4, TiO2, and WO3). Before being deposited on the oxide support, the silver nanoparticles were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and UV-VIS spectroscopy. The obtained catalysts, Ag_Fe3O4, Ag_TiO2, and Ag_WO3 were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), BET surface area analysis, UV-VIS spectroscopy, temperature-programmed reduction (H2-TPR), and temperature-programmed desorption (TPD) of CO2 and NH3. It has been demonstrated that the nature of the support significantly influences the physicochemical properties of the catalysts, as well as their catalytic performance in ammonia ozonation reaction.

Tunning valence state of cobalt centers in Cu/Co-CoO1-x for significantly boosting water-gas shift reaction

Dual active sites with synergistic valence state regulation under oxidizing and reducing conditions are essential for catalytic reactions with step-wise mechanisms to modulate the complex adsorption sites of reactant molecules on the surfaces of heterogeneous catalysts with maximized catalytic performances, but it has been rarely explored. In this work, uniformly dispersed CuCo alloy and CoO nanosheet composite catalysts with dual active sites are constructed, which shows huge boost in activity for catalyzing water-gas shift reaction (WGSR), with a record high reaction rate reaching 204.2 μmolCO gcat.−1 s−1 at 300 °C for Cu1Co9Ox amongst the reported Cu-based and Co-based catalysts. A synergistic mechanism is proposed that Coδ+ species can be easily reduced by CO adsorbed on Cu and Co0 can be oxidized by H2O. Systematic in situ characterization results reveal that the addition of Cu can regulate the redox properties of Co species and thus modulate the adsorption properties of catalysts. Particularly, doping of Cu0 sites weakens the affinity of the surface to CO or CO2 to a moderate level. Moreover, it also promotes the oxidation of *CO to *COOH and the desorption of the product CO2, reducing the carbon poisoning of the catalyst and thus increasing the reactivity. The results would provide guidance for the construction of novel heterogeneous catalyst with dual active sites and clarify its underlying reactivity enhancement mechanism induced by the tunning of valence state of metal centers for heterogeneous catalytic reactions.

Exploring the Activation of Atomically Precise [Pt17(CO)12(PPh3)8]2+ Clusters: Mechanism and Energetics in Gas Phase and on an Inert Surface.

Atomically precise clusters such as [Pt17(CO)12(PPh3)8]x+ (x = 1,2) (PPh3 is triphenylphosphine) are known as precursors for making oxidation catalysts. However, the changes occurring to the cluster upon thermal activation during the formation of the active catalyst are poorly understood. We have used a combination of hybrid mass spectrometry and surface science to map the thermal decomposition of [Pt17(CO)12(PPh3)8](NO3)2. High-resolution mass and ion mobility spectrometry together with DFT-based modeling were used to probe the sequence of fragmentation reactions and fragment structures generated upon collisional excitation of [Pt17(CO)12(PPh3)8]2+. This was compared with thermal desorption spectroscopy of [Pt17(CO)12(PPh3)8](NO3)2 dropcast onto an inert graphite surface. In both cases, a characteristic sequence of CO and benzene desorption steps is observed followed at higher excitation energy by H2 loss. This behavior is indicative of Pt-catalyzed C-H activation of phenyl groups during partial stripping of the ligand shell while the Pt17P8 cluster core is retained.

Copper-Catalysed Electrochemical CO2 Methanation via the Alloying of Single Cobalt Atoms.

The electrochemical reduction of carbon dioxide (CO2) to methane (CH4) presents a promising solution for mitigating CO2 emissions while producing valuable chemical feedstocks. Although single-atom catalysts have shown potential in selectively converting CO2 to CH4, their limited active sites often hinder the realization of high current densities, posing a selectivity-activity dilemma. In this study, we developed a single-atom cobalt (Co) doped copper catalyst (Co1Cu) that achieved a CH4 Faradaic efficiency exceeding 60% with a partial current density of -482.7 mA cm-2. Mechanistic investigations revealed that the incorporation of single Co atoms enhances the activation and dissociation of H2O molecules, thereby lowering the energy barrier for the hydrogenation of *CO intermediates. In situ spectroscopic experiments and density functional theory simulations further demonstrated that the modulation of the *CO adsorption configuration, with stronger bridge-binding, favours deep reduction to CH4 over the C-C coupling or CO desorption pathways. Our findings underscore the potential of Co1Cu catalysts in overcoming the selectivity-activity trade-off, paving the way for efficient and scalable CO2-to-CH4 conversion technologies.

Glycerol-Derived Water-Lean Amines for Post-Combustion CO2 Capture: The Improvement in Capacity and Viscosity.

Water-lean absorbents are regarded as a new generation of post-combustion CO2 capture technology that could significantly relieve those drawbacks posed by traditional aqueous alkanolamines. However, the exponential increase in viscosity during CO2 absorption remains an urgent issue that needs to be resolved before their practical deployment. In this work, novel water-lean amines based on biomass glycerol have been devised as single-component CO2 absorbents with low viscosity (79~110 cP at 25 oC, 29~39 cP at 40 oC) under high capacity (12~18 wt% at 25 oC, 10~17 wt% at 40 oC). The captured CO2 could be smoothly released by thermal desorption. Results from preliminary stability test and 10 absorption-desorption cycles showed that such non-aqueous absorbents had significant structural toughness as well as reusability. Spectroscopic measurements including 13C NMR and in situ FTIR were performed to gain mechanistic insights by monitoring the entire CO2 absorption and desorption process, while DSC, VLE and DFT calculations provided rational interpretation for reaction kinetics and thermodynamics. The synergistic promotion of glycerol ether group on both CO2 chemical and physical absorption was also verified under high pressure conditions.

Stable Reusability of Nanocellulose Aerogels with Amino Group Modification in Adsorption/Desorption Cycles for CO2 Capture.

This study evaluated the stability and reusability of amino-functionalized nanocellulose aerogels as CO2-adsorbent materials. The modified aerogels, synthesized via a controlled silylation using N-[3-(trimethoxysilyl) propyl] ethylenediamine (DAMO), demonstrated excellent thermal stability up to 250 °C (TGA) and efficient CO2 adsorption through chemisorption, which was the main adsorption mechanism. The performance of the aerogels was assessed using both adsorption isotherms and the decay pressure technique, revealing that CO2 adsorption capacity increased with higher amino group loading (4.62, 9.24, and 13.87 mmol of DAMO). At 298 K and 4 bar, CO2 adsorption capacity increased proportionally with the amino group concentration, reaching values of 3.17, 5.98, and 7.86 mmol of CO2 g-1 polymer, respectively. Furthermore, over 20 adsorption/desorption cycles, the aerogels maintained 95% CO2 desorption at ambient temperature, indicating their potential for industrial use. These findings highlight the aerogels suitability as stable, reusable materials for large scale CO2 capture and storage technologies.

Advancing CO2 absorption and desorption by mass transfer promoters: Density difference adjustment based on spontaneous interfacial turbulence

Advancing CO2 absorption and desorption by mass transfer promoters: Density difference adjustment based on spontaneous interfacial turbulence

Impact of partial regeneration method on the reduction of CO2 desorption energy

Amine-functionalized solid materials have shown efficacy for low-concentration CO2 environments; however, their regeneration is often hindered by slow desorption kinetics at low temperatures. To address this, an innovative approach termed “The Partial Regeneration Method” is introduced as a driving method to enable low-temperature regeneration of CO2 adsorbents at low concentration levels. Analysis of desorption kinetics mechanisms reveal that at low temperatures, CO2 molecules exhibit reduced kinetic energy and intraparticle diffusion coefficients. Furthermore, as it approaches chemical equilibrium temperature, the re-adsorption reaction rate increases. The partial regeneration method which selectively targets CO2 molecules with low re-adsorption rates could be more effective in a such low temperature conditions. This method involves intentionally halting regeneration midway and proceeding to the next adsorption process. Experimental application of specific energy requirements and scenario analysis demonstrated a 50.7% decrease in energy consumption compared to the conventional methods. By optimizing amine loading to reduce excessive re-adsorption, the shortened cycle period compensates for the decreased adsorption per cycle. Increasing the number of cycles led to a 97.5% improvement in CO2 adsorption capacity over a one-month period. Thus, when faced with unavoidable inefficient low-temperature regeneration conditions, the proposed partial regeneration method emerges as a promising solution for minimizing energy consumption.

In Situ Modulated Nickel Single Atoms on Bicontinuous Porous Carbon Fibers and Sheets Networks for Acidic CO2 Reduction.

Carbon-supported single-atom catalysts exhibit exceptional properties in acidic CO2 reduction. However, traditional carbon supports fall short in building high-site-utilization and CO2-rich interfacial environments, and the structural evolution of single-atom metals and catalytic mechanisms under realistic conditions remain ambiguous. Herein, an interconnected mesoporous carbon nanofiber and carbon nanosheet network (IPCF@CS) is reported, derived from microphase-separated block copolymer, to improve catalytic efficiency of isolated Ni. In IPCF@CS nanostructure, highly mesoporous IPCF hinders stacking of CS that provides additional fully exposed sites and abundant bicontinuous mesochannels of IPCF facilitate smooth CO2 transport. Such unique features enable enhanced Ni utilization and local CO2 enrichment, which cannot be achieved over conventional pore-deficient and discontinuous porous carbon fibers-based supports. In situ X-ray and Infrared spectroscopy coupling constant-potential calculations reveal the dynamic distortion of the planar Ni-N4 to an out-of-plane configuration with expanded Ni-N bond during operating CO2 electroreduction. The potential-driven low-valance-state Ni-N4 possesses enhanced intrinsic electrokinetics for CO2 activation and CO desorption yet inhibiting hydrogen evolution. The favorable electronic and interfacial reaction environments, resulted from the in situ tailored Ni site and IPCF@CS support, achieve an FE of near 100% at 540mAcm-2, a TOF of 55.5 s-1, and a SPCE of 89.2% in acidic CO2-to-CO electrolysis.

Spontaneous Metal-Chelation Strategy for Highly Dense Ni Single-Atom Catalysts with Asymmetric Coordination in CO2 Electroreduction.

Developing metal-nitrogen-doped carbon single-atom catalysts (M-NC SACs) with high loadings for the electrochemical CO2 reduction reaction (eCO2RR) remains challenging owing to the risk of metal aggregation. Herein, the study presents a facile strategy for synthesizing M-NC SACs using metal-chelating ligands, eliminating the need for additional processing steps. Specifically, using ethylenediaminetetraacetic acid as a strong metal-chelating ligand, the formation of Ni nanoparticles is effectively prevented and a high loading of ≈2.7 wt.% is achieved, leading to the development of high-loading Ni SACs. The resulting catalysts exhibit a high CO faradaic efficiency (FECO) of 96.6% and CO partial current density of -120.2 mA cm-2 and retain a FECO over 90% in a broad potential range of -0.4 to -0.9 V versus the reversible hydrogen electrode. Furthermore, theoretical calculations indicate that the asymmetric Ni-N3C1 local coordination structure within the catalyst reveals an optimal balance between *COOH formation and *CO desorption, which enhances the activity for eCO2RR to CO. This study offers an efficient strategy to suppress metal nanoparticle formation while simultaneously improving the metal loading in M-NC SACs.

Improving CO2 desorption performance in monoethanolamine solutions by adding titanium pyrophosphate catalyst

Catalytic CO2 desorption has emerged as a crucial strategy for enhancing the efficiency of CO2 capture and reducing energy requirements, thereby advancing chemical absorption methods. This study examines the catalytic effectiveness of titanium pyrophosphate (TiP2O7) in improving monoethanolamine (MEA)-based CO2 absorption and desorption processes, comparing its performance with other titanium-based catalysts, including titanium dioxide (TiO2), titanium tetrahydroxide (TiO(OH)2), and titanium carbide (TiC). In TiP2O7, Ti ions function as Lewis acid sites by accepting electron pairs (LASs), P2O74− anions act as proton carriers, facilitating rapid proton transfer as Lewis base sites (LBSs), and active hydroxyl groups on the surface, resulting from water molecule dissociation or the deprotonation reaction, function as Brönsted acid sites (BASs). These sites work synergistically to accelerate CO2 desorption. TiP2O7 outperforms the other catalysts tested, primarily due to its optimal Brönsted/Lewis (B/L) ratio. This characteristic is particularly advantageous for regenerating RNHCOO−, as the reaction predominantly follows a hydrogen transfer pathway facilitated by the BASs. Consequently, TiP2O7 enhances the CO2 desorption rate by 41.5% at a desorption temperature of 91 °C, while simultaneously reducing the relative heat duty by 13% compared to processes without catalysts.

Industry-Level Electrocatalytic CO2 to CO Enabled by 2D Mesoporous Ni Single Atom Catalysts.

Electrocatalytic CO2 reduction reaction (eCO2RR) has captivated widespread attentions, yet achieving the requisite efficiency, selectivity and stability for industrial applications poses a persistent challenge. Here, we report the synthesis of 2D mesoporous Ni single atom catalysts in N-doped carbon framework via a bottom-up interfacial assembly strategy. The 2D mesoporous Ni-N-C catalyst showcases an ultrathin thickness (~6.7 nm) with well-distributed 5 to 40 nm-width mesopores in plane and a high surface area. As a result, the Ni single atom sites with a high density (~6.0 wt %) are almost completely exposed and can be accessible, and the mass transfer can be greatly promoted even at high current densities. Thus, a high current density of 446 mA cm-2 with >95 % CO selectivity in a flow cell can be obtained. Concurrently, the catalyst demonstrates an impressive stability, maintaining a 50-hours continuous electrolysis in the membrane electrode assembly test and achieving an energy efficiency of 42 %. Finite element analysis reveals that the 2D mesoporous design enhances CO2 diffusion, ensuring efficient adsorption and swift CO desorption at high current densities. Our study paves a way for the fabrication of 2D mesoporous single atom catalysts with nearly 100 % accessibility and expedited mass transport.

​Industry‐Level Electrocatalytic CO2 to CO Enabled by 2D Mesoporous Ni Single Atom Catalysts

Electrocatalytic CO2 reduction reaction (eCO2RR) has captivated widespread attentions, yet achieving the requisite efficiency, selectivity and stability for industrial applications poses a persistent challenge. Here, we report the synthesis of 2D mesoporous Ni single atom catalysts in N‐doped carbon framework via a bottom‐up interfacial assembly strategy. The 2D mesoporous Ni‐N‐C catalyst showcases an ultrathin thickness (~6.7 nm) with well‐distributed 5 to 40 nm‐width mesopores in plane and a high surface area. As a result, the Ni single atom sites with a high density (~6.0 wt.%) are almost completely exposed and can be accessible, and the mass transfer can be greatly promoted even at high current densities. Thus, an industry‐level current density of 446 mA cm‐2 with > 95% CO selectivity in a flow cell can be obtained. Concurrently, the catalyst demonstrates an impressive stability, maintaining a 50‐hours continuous electrolysis in the membrane electrode assembly test and achieving an energy efficiency of 42%. Finite element analysis reveals that the 2D mesoporous design enhances CO2 diffusion, ensuring efficient adsorption and swift CO desorption at high current densities. Our study paves a way for the fabrication of 2D mesoporous single atom catalysts with nearly 100% accessibility and expedited mass transport.

One-pot construction of highly active defective g-C3N4 via hydrogen bond of the biomass for the improvement of CO2 conversion

Graphitic carbon nitride (g-C3N4) containing conjugated tri-s-triazine units has a high abundance of amine and guanidine groups, which are ideal for the application of CO2 conversion. However, absolute g-C3N4 is inherently scarce in Lewis base sites, which leads to low catalytic activities. In this study, we present a simple and green method to in situ construct chrysanthemum stalk-derived porous carbon/ highly active defective g-C3N4 (PC/g-C3N4) through hydrogen bond, increasing the surface area and a high density of Lewis base sites. The chrysanthemum stalk contains cellulose, hemicellulose and lignin, which possess a significant number of hydroxyl functional groups and drain channels, thereby providing more hydrogen bonding for highly active defective g-C3N4. The XPS spectra revealed that, in comparison to PC/g-C3N4–1 and PC/ g-C3N4–2.5, PC/g-C3N4–2 exhibited a higher C-NH2 content at the edge of the nitrogen element. PC/g-C3N4–2 had a high specific surface area to expose more active sites for absorbing CO2. The quantification of the base sites is determined by the peak area of the thermal programmed desorption of CO2 and is 229.6 μmol/g for PC/g-C3N4–2. PC/g-C3N4–2 demonstrated excellent catalytic activity in the cycloaddition with hierarchical pores. The yield of cyclic carbonate was up to 99% with a selectivity of 99% under mild solvent-free conditions. The mechanistic studies indicate that PC/g-C3N4–2 not only captured CO2, but also provided hydrogen bonds to activate the oxygen atom of epichlorohydrin (ECH). It is our contention that the multifunctional organic-inorganic hybrid materials have considerable potential for the production of cyclic carbonate.

Impact of Ga, Sr, and Ce on Ni/DSZ95 Catalyst for Methane Partial Oxidation in Hydrogen Production

The greenhouse gas CH4 is more potent than CO2, although both these gases are solely responsible for global warming. The efficient catalytic conversion of CH4 into hydrogen-rich syngas, which also demonstrates economic viability, can deplete the concentration of CH4. This study examines the partial oxidation of methane (POM) prepared by the wetness impregnation process using 5% Ni supported over DSZ95 (93.3% ZrO2 + 6.7% Sc2O3) and promoted with 1% Ga (gallium), 1% Sr (strontium), and 1% Ce (cerium). These catalysts are characterized by surface area porosity, X-ray diffraction, FT-Infrared spectroscopy, Raman infrared spectroscopy, temperature programmed reduction, CO2 temperature-programmed techniques, desorption techniques, thermogravimetry, and transmission electron microscopy. The characterization results demonstrate that Ni is appropriate for the POM because of its crystalline structure, improved metal support contact, and increased thermal stability with Sr, Ce, and Ga promoters. The synthesized catalyst 5Ni+1Ga-DSZ95 maintained stability for 240 min on stream during the POM at 700 °C. Adding a 1% Ga promoter and active metal Ni to the DSZ95 improved the CH4 conversion from 70.00% to 75.90% and raised the H2 yield from 69.21% to 74.80%, while maintaining the reactants’ stoichiometric ratio of (CH4:O2 = 2:1). The 5Ni+1Ga-DSZ95 catalyst is superior to the other catalysts, given its rich catalyst surface, strong metal support interaction, high surface area and low amount of carbon deposit. The high H2/CO ratio (>2.6) and H2 yield close to 75% indicate that 5Ni+1Ga-DSZ95 is a potent industrial catalyst for hydrogen-rich syngas production through partial oxidation of methane.

Comparative study on the adsorption performance of CO2 and Hg in flue gas using corn straw and pine biochar modified by KOH

This study presents a comparative analysis of the adsorption performance of KOH-modified biochar derived from corn straw and pine for CO2 and Hg capture from coal-fired flue gas. The results indicate that the increase in KOH-activation temperature could significantly enhance the specific surface area. Pine biochar (PACs) activated at 800 °C exhibited the highest CO2 adsorption capacity, reaching 3.79 mmol/g at 25 °C. As well as, for corn straw biochar (CACs), the activation temperature of 700 °C is the optimal condition. The isosteric heat of adsorption for PACs and CACs is less than 40 kJ/mol and the R2 of the pseudo-first-order kinetic model exceeds 0.9, demonstrating that the CO2 adsorption of biochar mainly relies on physisorption. The main factor affecting the CO2 adsorption performance is the micropore capacity (<10 Å). CO2 capture positively correlates with carbon content and graphitization degree but negatively correlates with total pore volume and specific surface area. In addition, PACs and CACs present better CO2 adsorption performance after 10 cycles. PAC-800 can achieve CO2 desorption at lower temperatures and has higher selectivity for CO2, compared with CAC-700. CO2 can enhance the mercury removal efficiency of biochar to a certain extent. However, the maximum on-line mercury removal efficiency of both pine and corn straw biochar is less than 80 % under CO2 capture conditions, indicating that it is necessary to improve Hg capture performance by constructing higher-affinity sites on the surface of the biochar.

Plasmon-enhanced hydrogen production from photocatalytic methanol aqueous-phase reforming over novel nickel-tin intermetallic compounds photocatalyst

Hydrogen production from the aqueous phase reforming (APR) of methanol is promising to reduce the global carbon dioxide emission, but it is still a great challenge for hydrogen production with high catalytic efficiency at low reaction temperature. Here we report that Al2O3 supported Ni3Sn1 intermetallic compounds nanoparticles as new class of plasmonic photocatalyst and enables low temperature (150–190 °C), efficient hydrogen production (277μmol g−1 min−1) and low CO and CH4 selectivity (≤ 0.1 %) through APR with the help of light irradiation. The hydrogen production rate of Ni3Sn1/Al2O3 is 8 times higher than that of conventional noble metal 3 wt% Pt/Al2O3 catalyst under the same optimized reaction conditions. The exceptional photocatalytic performance for hydrogen production can be attribute to higher efficiency of “hot electron” transference into the reactant due to the higher energy level of “hot electron” and the lower energy level of metal-reactant adsorption bond induced by Sn doping in Ni3Sn1 under light irradiation, which not only improve the reactivity via enhanced methanol dissociation and the sequential water–gas shift (WGS) reaction, but also suppressed catalyst poisoning via accelerated CO2 desorption over the Ni sites.

Electrochemical Adsorption-Desorption Mechanism on Composite Electrode Materials for CO2 Direct Air Capturing

Use of carbon-based fossil fuels, greenhouse gases are emitted to the atmosphere causing fatal environmental issues like global warming. To overcome this problem, Sustainable Development Goals (SDGs) is now a fundamental issue for worldwide nations. Among them, carbon neutrality stands as a central pillar since CO2 has the biggest portion of emitted green-house gases. Emitted CO2 from industrial facilities like factories and incinerators is collected by various carbon capturing technology which is developed due to the pursuit of carbon neutrality necessities. Among them, Direct Air Capture (DAC) is gaining interests due to its superior efficiency compared to other alternatives such as filters and absorbents for the challenges like high pressure and elevated temperatures at the CO2 capturing process. Furthermore, the durability of filtration materials and waste problems poses a significant concern to the environment. To overcome these limitations, electrochemical adsorption system is looking forward to becoming the next generation carbon capture technology. By applying varying electrical energies, this allows adsorption and desorption of CO2 within an adsorber layer. By this mechanism, we can significantly reduce the filtration waste of capturing process. The adsorber layer is consisted with catalysts, which has large surface area and active sites that can adsorb and desorb CO2 stably with electricity. Detailed physicochemical and electrochemical characterizations of the reactive and adsorbent materials were conducted with chemically designed evaluation system to measure the CO2 capturing efficiency.