CO2 Uptake Capacity Research Articles

Hierarchical Porous Activated Carbon from Wheat Bran Agro-Waste: Applications in Carbon Dioxide Capture, Dye Removal, Oxygen and Hydrogen Evolution Reactions.

This work reports an efficient method for facile synthesis of hierarchically porous carbon (WB-AC) utilizing wheat bran waste. Obtained carbon showed 2.47 mmol g-1 CO2 capture capacity with good CO2 /N2 selectivity and 27.35 to 29.90 kJ mol-1 isosteric heat of adsorption. Rapid removal of MO dye was observed with a capacity of ~555 mg g-1 . Moreover, WB-AC demonstrated a good OER activity with 0.35 V low overpotential at 5 mA cm-2 and a Tafel slope of 115 mV dec-1 . It also exhibited high electrocatalytic HER activity with 57 mV overpotential at 10 mA cm-2 and a Tafel slope of 82.6 mV dec-1 . The large SSA (757 m2 g-1 ) and total pore volume (0.3696 cm3 g-1 ) result from N2 activation contributing to selective CO2 uptake, high and rapid dye removal capacity and superior electrochemical activity (OER/HER), suggesting the use of WB-AC as cost effective adsorbent and metal free electrocatalyst.

Carbonation curing of modified magnesium-coal based solid waste backfill material for CO2 sequestration

CO2 sequestration is an effective method for dealing with the global climate crisis, and carbonation curing is considered an effective method of sequestering CO2 and improving the mechanical properties of cement-based materials (CBM). Regarding modified magnesium-coal based solid waste backfill material (MB), to explore its carbonation curing performance and CO2 sequestration capacity, its uniaxial compression strength (UCS), carbonation depth, microstructure, CO2 transport performance, CO2 uptake capacity, and carbonation efficiency are analyzed and characterized using UCS tests, thermogravimetric analysis (TGA), X-ray diffraction (XRD), and nuclear magnetic resonance (NMR) analysis. The results show that the early UCS of the MB is significantly improved by carbonation curing. The UCS at 7 days is 10.91 times higher than that of the MB without carbonation curing, and the UCS increases as the concentration and modified magnesium slag-based cementitious material (MC) content increase. Carbonation curing makes the microstructure of the MB significantly denser and reduces the porosity, pore diameter, and permeability. The formation of carbonated products such as calcium carbonate and hydration products makes the microstructure more compact, which is the main reason for the rapid increase in the early UCS of the MB. The maximum CO2 uptake capacity of the MB through carbonation curing is 14.3%, and the carbonation efficiency is up to 92.2%. Therefore, carbonation curing of MB has broad application potential in improving the UCS and sequestering CO2.

Solving two environmental problems simultaneously：Microporous carbon derived from mixed plastic waste for CO2 capture

Conversion of plastic waste into porous carbon for CO2 capture is an attractive approach to solve the carbon emission and plastic pollution problems, simultaneously. However, the previous studies are limited to the utilization of single PET plastic. The conversion of mixed plastic waste (MPW), which is of more practical significance, is seldom reported. In this study, mixed plastic waste was converted into porous carbon materials for CO2 capture through cascading autogenic pressure carbonization (APC) and chemical activation. The carbon yield of 56% was achieved through APC of MPW. The activator (KOH) dosage had significant effects on the structure and properties of the prepared porous carbons. Porous carbon prepared with KOH/C ratio of 4 had the largest micropore area and the maximum CO2 adsorption was 2.7 mmol g−1 at 298 K and 1 bar. The experimental data were well fitted to the pesudo first-order kinetic model. The MPW derived porous carbon exhibited not only high CO2 uptake capacity, but also fast adsorption rate, good selectivity of CO2 over N2 and good cyclic stability, which could be regarded as a promising adsorbent for CO2 adsorption.

Rapid, simple and sustainable preparation of N-rich activated carbons with high performance for gas adsorption, via microwave heating

Rising the activity of activated carbons by surface modification has attracted considerable research attention in the fields of gas adsorption and energy storage. However, conventional functionalization of activated carbons typically requires high cost and long-term heating process. In this work, we report a simple and feasible strategy to prepare N-rich activated carbons with well-developed porosities through microwave heating. Through microwave heating, N-rich (up to 9.35 at.%) activated carbons with high porosities can be prepared within 20 min, reducing preparation time and energy consumption by 77.0% and 99.4%. Under microwave irradiation, the interaction between melamine and carbon precursors is promoted to generate an amount of defects, resulting in the introduction of N species and reducing the consumption of nitrogenous reagents (50%). Moreover, due to the enhanced van der Waals interactions between the nitrogenous carbon surface and molecules, the prepared N-rich activated carbons present excellent increase in breakthrough adsorption capacity of toluene (up to 26.0 %) and CO2 uptake (9.8 %) with similar pore structure. In summary, this study provides a facile, efficient, and universal strategy for surface modification of activated carbons toward a range of applications.

Closing a biorefinery cycle of giant reed through the production of microporous and reusable activated carbon for CO2 adsorption

The complete valorisation of all biomass components represents a crucial strategy for developing new biorefinery schemes. This study completed a cascade biorefinery process for the exploitation of holocellulose and lignin fractions of the non-food biomass giant reed (Arundo donax L.). The residual lignin-rich solid fraction, obtained after the selective conversion of hemicellulose and cellulose fractions to valuable bioproducts, was characterised and activated by KOH treatment into microporous activated carbon (AC), to be proposed for CO2 adsorption. The production of AC was optimised by the Design of Experiments technique. Under the optimised process conditions (630 °C, KOH/lignin 3.0 wt/wt, 60 min) the AC yield was 34.4 wt% and the CO2 uptake reached 72.3 mg/g, confirming the promising application of this biomaterial. Moreover, the obtained AC showed similar CO2 uptake values over 10 cycles of adsorption/desorption tests, demonstrating its good recyclability, keeping its pristine CO2 uptake capacity.

Construction of N-Rich Aminal-Linked Porous Organic Polymers for Outstanding Precombustion CO2 Capture and H2 Purification: A Combined Experimental and Theoretical Study.

A large number of scientific investigations are needed for developing a sustainable solid sorbent material for precombustion CO2 capture in the integrated gasification combined cycle (IGCC) that is accountable for the industrial coproduction of hydrogen and electricity. Keeping in mind the industrially relevant conditions (high pressure, high temperature, and humidity) as well as good CO2/H2 selectivity, we explored a series of sorbent materials. An all-rounder player in this game is the porous organic polymers (POPs) that are thermally and chemically stable, easily scalable, and precisely tunable. In the present investigation, we successfully synthesized two nitrogen-rich POPs by extended Schiff-base condensation reactions. Among these two porous polymers, TBAL-POP-2 exhibits high CO2 uptake capacity at 30 bar pressure (57.2, 18.7, and 15.9 mmol g-1 at 273, 298, and 313 K temperatures, respectively). CO2/H2 selectivities of TBAL-POP-1 and 2 at 25 °C are 434.35 and 477.93, respectively. On the other hand, at 313 K the CO2/H2 selectivities of TBAL-POP-1 and 2 are 296.92 and 421.58, respectively. Another important feature to win the race in the search of good sorbents is CO2 capture capacity at room temperature, which is very high for TBAL-POP-2 (15.61 mmol g-1 at 298 K for 30 to 1 bar pressure swing). High BET surface area and good mesopore volume along with a large nitrogen content in the framework make TBAL-POP-2 an excellent sorbent material for precombustion CO2 capture and H2 purification.

Prominent COF, g-C3N4, and Their Heterojunction Materials for Selective Photocatalytic CO2 Reduction

New heterojunction materials (HJs) were synthesized in-situ by molecularly bonding the monomers of a triazine-based covalent organic framework (bulk COF) on the template of exfoliated carbon nitride (g-C3N4). The photocatalysts reduced carbon dioxide to carbon monoxide in aqueous dispersions under UV irradiation. The g-C3N4 showed production of 6.50 μmol CO g−1 h−1 and the bulk COF of 2.77 μmol CO g−1 h−1. The CO yield was evaluated in sustainability photoreduction cycles and their CO2 uptake capacity and isosteric heat of adsorption were estimated. All the heterojunction photocatalysts obtained ameliorated CO production rates compared to the bulk COF. Finally, the influence of the Pt co-catalyst on the photocatalytic activities was determined without the addition of any sacrificial agent, and the COF:g-C3N4 heterojunction with the ratio of 1:10 was proven to be a photocatalytic system with an optimum and selective, CO yield of 7.56 μmol g−1 h−1.

Exploring the synthese, structure, and properties of a 3D Mn-MOF based on 4,6-bistriazole isophthalic acid

One three dimensional metal organic framework {[Mn2(BTIA)2(H2O)]·7H2O}n (Mn-1) was synthesized from the multidentate organic linker 4,6-bistriazole isophthalic acid (H2BTIA) and MnCl2·4H2O under solvothermally condition. The structure of 1 exhibits as a three-dimensional framework fabricated by the binuclear subunits [Mn2(COO)2(H2O)] and the organic linkers (H2BTIA). Topologically, it displays a binodal framework with Schläfli symbol (44·62)2(416·612), which contains one dimensional channels along a direction. The magnetic behavior of Mn-1 was investigated, which discloses the antiferromagnetic (AF) interactions between Mn2+ ions with the coupling constant J = −1.38 cm−1. In additin, the porous Mn-MOF shows a small uptake capacity for CO2.

A g-C3N4 nanotube assisted and (Ce-Mg) co-doped limestone-derived sorbent: Bidirectional diffusion channels and double vacancy mechanism constructed for CO2 capture

A novel (Ce-Mg) co-promoted CaO sorbent with multi-dimensional through-hole structure was fabricated by a hydrothermal template method based on natural limestone, to address the evident decline of CO2 adsorption performance during circulation. A trend of first increasing and then stabilizing was achieved for CO2 long-term durability of the as-prepared sorbent by the hydrothermal recrystallization process. The CO2 absorption capacity of the (Ce-Mg) co-promoted tubular sorbents exceeded that of the reference sample without hydrothermal template treatment by ∼ 400% after 30 cycles. 97% of the initial CO2 capacity can be maintained at the 30th cycle. This significant CO2 uptake capacity can be attributed to the multiple synergistic interactions yielded by incorporating g-C3N4 nanotube template with (Ce-Mg) co-doping. A bidirectional gas diffusion channel was constructed based on the inner-outer multi-dimensional connection structure of g-C3N4, which allowed the sorbent to maintain the prominent specific surface area and pore volume during cycles. After 30 cycles, the specific surface area of the limestone-derived sorbents can still remain at 16.31 m2/g. Furthermore, a double vacancy mechanism that can facilitate the gas transport through both the product layer and the surface layer of CaO grains caused by the co-doping of (Ce-Mg) was proposed, which can also promote the electron transport between CaO and CO2. This synergistic strategy proved useful for improving the CO2 uptake performance and cycle durability of CaO sorbents in practical applications.

One-step synthesis of CaO/CuO composite pellets for enhanced CO2 capture performance in a combined Ca/Cu looping process via a facile gel-casting technique

The combined Ca/Cu looping process is a promising CO2 capture technology, in which the exothermic reduction of CuO with reducing gas (e.g., CH4, H2, or CO) is used in situ to supply the heat required to calcine CaCO3 via CaO/CuO composites. Although possessing excellent redox characteristics, CaO/CuO composites suffer from severe deactivation in their CO2 capture performance during cyclic operation. Besides, developing CaO/CuO composite pellets is essential for the practical applications of the combined Ca/Cu looping process. Thus in this work, we proposed a facile gel-casting technique to achieve a one-step synthesis of CaO/CuO composite pellets with enhanced CO2 capture performance. The results show that CaO/CuO composite pellets with homogeneous elemental distribution and a molar ratio of Ca to Cu of one can be obtained by adjusting the immersion time (∼24 – 48 h) and the molar ratio of Ca to Cu (∼2) in the mixed precursor solution during the material synthesis process. The CaO/CuO composite pellets had an initial CO2 uptake capacity of 0.16 gCO2/gmaterial and a final CO2 uptake capacity of 0.10 gCO2/gmaterial after ten repeated cycles. With the addition of glucose as the pore-forming material, sintering was reduced and the modified CaO/CuO composite pellets showed a much improved CO2 capture performance. With the optimal addition amount of glucose (i.e., a mass ratio of glucose to sodium alginate of two), the best-performing modified CaO/CuO composite pellets had a final CO2 uptake capacity of 0.14 gCO2/gmaterial after ten repeated cycles, exceeding that of the unmodified counterpart by 40%. Furthermore, the mechanism of structural improvement of CaO/CuO composite pellets by adding glucose was elucidated.

Optimization performance of viscose rayon derived flexible porous carbon cloths in relation to their CO2 capture, CO2/CH4 separation and methanol adsorption

From the practical perspective, innovative porous carbon material is needed for gas adsorption and separation. Here, flexible porous carbon cloths are successfully prepared from viscose rayon cloth via controllable adjusted KOH activation. In order to optimize such flexible porous carbon cloths, the relationship between KOH activation condition and the porous carbon cloths property have been systematically studied. The effect factors on CO2 capture, CO2/CH4 separation and methanol adsorption have been analyzed in depth. Due to the largest narrow micropore volume (PV1 nm), ACC-240–800 exhibits the best CO2 uptake capacity of 4.11 mmol g−1 under ambient condition. Based on the ideal adsorbed solution theory model, the ACC-240–700 exhibits the highest selectivity of 3.73, 3.13 and 2.65 for CO2/CH4 mixing proportion of 30/70, 46/60 and 50/50, respectively, at 25 °C and 1 bar, owing to the synergetic result of O&N content and PV1 nm. The CO2/CH4 separation performance on ACC-240–700 is analyzed and confirmed by Qst calculation for CO2 and CH4, and dynamic breakthrough experiments with equimolar binary CO2/CH4 (50/50) mixture. The determining factors on methanol adsorption is mainly the porosity structure. The best methanol adsorption uptake of 12.87 mmol g−1 is observed on ACC-240–800 at 25 °C and 95 mbar, because of the largest values of SBET, Vmicro and PV1mn. The flexible porous carbon cloths provided in this work can act as effective adsorbent for carbon capture, low-quality nature gas upgrading and methanol adsorption in the industrial processes.

Lithium based high temperature sorbent from copper slag: Synthesis and CO2 capture performance

Using high temperature CO2 sorbent for carbon capture is an effective approach to reduce carbon footprint. Copper slag, as an abundant metallurgical waste containing substantial amount of Si and Fe resources, was being explored as cheap raw material for the preparation of lithium-based sorbent. The results shows that the lithiation is initiated at 450–600 °C, where fayalite and magnetite in slag are firstly oxidized by released water vapor from the decomposition of LiOH, then further react with Li2O to form Li4SiO4 and LiFeO2. As the temperature rises, the conversion of LiFeO2 to Li5FeO4 and incorporation of Fe3+, Al3+ into Li4SiO4 lattice occur in parallel. The resulting sorbent exhibited excellent CO2 chemisorption ability with a capture capacity of 420 mg/gmaterial at 725 °C. Particularly, even in the gas stream containing 5 vol% CO2, it showed a CO2 uptake capacity of 383 mg/gmaterial. In the CO2 cycling tests, the sorbent suffered a decay in sorption capacity, which was ascribed to the poor regeneration ability of Li5FeO4. Comparatively, it possesses a relatively high capacity of 241 mg/gmaterial in 20 vol% CO2 after 20 cycles, which is higher than those of previously reported Li-silicate sorbents derived from wastes.

Synthesis of ZIF-90 based nanozyme with excellent carbonic anhydrase activity

Capturing CO2 using natural carbonic anhydrase (CA) has advantages of environmental friendliness, low energy consumption, renewable and no secondary pollution. However, the high cost, poor stability and low reusability of free CA under harsh conditions limit its industrial applications. Great efforts have been devoted to developing CA mimetic nanozymes to solve these problems. In this work, ZIF-90-based nanoparticles were prepared to mimic the active center of natural CA. The excellent CA-like catalytic activity of ZIF-90 nanoparticles was confirmed by using hydrolysis of p-nitrophenyl acetate (p-NPA) as the model reaction. Moreover, modifying ZIF-90 with monoethanolamine (MEA) could further improve its affinity for CO2, which in turn enhances the CO2 uptake capacity. Moreover, the hydrolysis of CO2 was also investigated through the pH decrease of the reaction solution and the results indicated that CO2 hydration and exchange were remarkably enhanced with the aid of ZIF-90 or ZIF-90 @MEA. This approach is facile and costless, which sheds light on the development of novel catalysts for industrial CO2 capture.

A computational investigation on the roles of binding affinity and pore size on CO2/N2 overall adsorption process performance of MOFs through modifying MIL-101 structure

To develop an appropriate metal-organic framework to capture CO2 from dry flue gas, understanding the roles of structural modifications, location of primary adsorption sites and underlying adsorption mechanisms is crucial. Herein, effects of type, position and concentration of nitrogen-containing functional groups and C/N-substituted ligands are investigated on overall CO2/N2 adsorption process performance and mechanism of pristine and metal-substituted MIL-101 MOFs. In this investigation, density functional theory computations, grand-canonical Monte-Carlo, and molecular dynamics simulations are applied. Taguchi-based overall evaluation criteria objective function is also used to assess the overall adsorption performances of these MIL-101 MOFs in terms of CO2 uptake capacity, CO2/N2 selectivity, isosteric heat of adsorption and mass transfer resistance. The PBE/DZVP computations resulted in the CO2-framework binding energies ranging from −3.85 to −21.01 kJ/mol implying an acid-base type of physisorption. A correlation is introduced to estimate the CO2 uptake capacity from binding affinity and pore diameter of these MIL-101 MOFs. Mechanistic investigations show that to enhance CO2 uptake capacity and CO2/N2 selectivity, functionalization of the linker ligands is more successful than functionalization of the open metal sites having strong interactions with CO2 molecules. Results also showed that the best possible scenario to improve the overall adsorption process performance of MIL-101 is to substitute the C atom(s) of the BDC ligands with the N atom(s), regardless of the central metal atom type. The comprehensive molecular design approach introduced in this work can be used as a methodology by scientists for the development of new MOFs for practical CO2 capture applications.

Assessment of CaO-based sorbent/spinel catalyst composites for the oxidative dehydrogenation of ethane in isothermal integrated CO2 capture and utilization

In this study, a comparative analysis of the isothermal integrated CO2 capture and utilization (ICCU) performance of MgB2O4 (B = Cr, Ga, Fe, Al)/CaCe15 was conducted. Results show that MgCr2O4/CaCe15 demonstrates exceptional performance, with CO2 uptake capacity, CO2 conversion, ethane conversion, ethylene selectivity, and ethylene yield after multiple cycles measuring at 0.22 g/g, 35.6 %, 19.6 %, 89 %, and 17.4 %, respectively. The dominant mechanism during the CO2 utilization stage was explored, and the coupling mechanism of catalytic dehydrogenation and reverse water–gas shift reaction is dominant. The reaction pathway during CO2 utilization was investigated, and results show that hydrogenation activation (CO2*+H* → HCOO* → CO*+OH*) is the primary pathway for CO2 dissociation, with the oxidative dehydrogenation of ethane mainly attributed to the activation of C–H on distinct C atoms, CH3CH3* → CH3CH2* → CH2CH2*. Meanwhile, the scission of the first C–H bond during CO2 utilization is the rate-determining step. Furthermore, we investigated the influencing factors and discovered that increasing the concentration of ethane and weight hourly space velocity both lead to a decrease in ethylene yield.

Capture and Electrochemical Conversion of CO2 into Carbon Nanotubes Using Molten Alkali Metal Borates

Molten alkali metal borates have recently shown promise as high-temperature sorbents for capture of CO2 and acid gases. These molten salt sorbents enable realization of thermodynamic enhancements offered by conventional solid high temperature sorbents while resolving practical challenges such as morphological degradation. Prior studies have focused on regeneration of alkali borates through steam sweeping and thermal cycling. In this work, we demonstrate that mixed sodium-lithium borate salts as CO2 sorbents can also be regenerated electrochemically, producing valuable multiwalled carbon nanotubes (MWCNT) via electroreduction of captured CO2. Effects of cathode materials and operating conditions in CO2 electroreduction in molten sodium-lithium borate are quantified. By varying relative starting compositions of alkali borates and alkali carbonates, an optimal composition of borates and carbonates is determined, achieving high coulombic efficiencies and significantly higher CO2 uptake capacities than traditionally employed carbonate salts used for conversion of CO2 into CNTs in the desirable 550-650°C range.

Reversed CO2/C2H2 separation with ultrahigh carbon dioxide adsorption capacity in Zn-based pillared metal-organic frameworks

The removal of CO2 impurities from CO2/C2H2 gas mixtures to obtain high-purity acetylene used for manufacturing of various commodity chemicals, is very important for the chemical purifying of acetylene. However, CO2 and C2H2 exhibit analogous physical properties as well as molecular sizes causing their separation to become an industrially challenging process, and developing energy-efficient CO2-selective adsorbents is a class of materials of vast value. In this work, a pillared-layer ultramicroporous metal-organic framework (MOF) constructed from zinc (Ⅱ) and triazolium planar layers with oxalic acid, which has been termed as CALF-20, can preferentially absorb CO2 from C2H2. Unique pore environment and electrostatic effects enable this material foremost capture CO2. CALF-20 shows higher affinities towards CO2 than C2H2 based on heats of adsorption computed from single-component adsorption isotherms. Grand Canonical Monte Carlo simulations confirm the affinity interactions and multiple host-guest interactions between CO2 and CALF-20. Sorption experiments revealed that CALF-20 has excellent trapping volume with extremely high CO2 uptake capacity (140.2 cm3 cm−3).

Environmental, economic and engineering performances of aqueous carbonated steel slag powders as alternative material in cement pastes: Influence of particle size

The low reactivity and volume expansion issue of steel slag limits its application as alternative to cement. Studies demonstrated that aqueous carbonation (AC) can enhance the cementitious properties of finely sized steel slag as a cementitious supplementary material (SCM). However, the impact of particle size on the CO2 uptake capacity and its association of performance of carbonated steel slag remains unexplored. This study aims to optimize the grinding levels by examining the fineness of the steel slag used as SCM to reduce the high-energy consumption while maintaining the CO2 sequestration and properties of SCM. The results show that reducing the size of steel slag is favorable for CO2 sequestration (particle size 22.4–112.6 μm corresponds to sequestration of ∼88.5–37.9 kg CO2/t steel slag) and improve the leaching of Mg ions for mineralization. The life cycle assessment shows that the global warming potential of AC of steel slag is ∼96.2–24.9 kg CO2-eq/t steel slag, which can offset the carbon emissions due to further grinding. The 28-day compressive strength of the cement pastes blended with finer carbonated steel slag was also relatively higher due to the formation of mono-carboaluminates and stabilization of ettringite in facilitating the bond strength between the carbonated steel slag particle and the cement paste matrix. According to 3E (engineering, environmental and economic) triangle model, 22.4 μm steel slag powder showed the best comprehensive performance, including an increased revenue of 40.8 CNY/ton steel slag.

Mixed-metal Ionothermal Synthesis of Metallophthalocyanine Covalent Organic Frameworks for CO2 Capture and Conversion.

Phthalocyanines (PCs) are intriguing building blocks owing to their stability, physicochemical and catalytic properties. Although PC-based polymers have been reported before, many suffer from relatively low stability, crystallinity, and low surface areas. Utilizing a mixed-metal salt ionothermal approach, we report the synthesis of a series of metallophthalocyanine-based covalent organic frameworks (COFs) starting from 1,2,4,5-tetracyanobenzene and 2,3,6,7-tetracyanoanthracene to form the corresponding COFs named M-pPPCs and M-anPPCs, respectively. The obtained COFs followed the Irving-Williams series in their metal contents, surface areas, and pore volume and featured excellent CO2 uptake capacities up to 7.6 mmol g-1 at 273 K, 1.1 bar. We also investigated the growth of the Co-pPPC and Co-anPPC on a highly conductive carbon nanofiber and demonstrated their high catalytic activity in the electrochemical CO2 reduction, which showed Faradaic efficiencies towards CO up to 74 % at -0.64 V vs. RHE.

Mixed‐metal Ionothermal Synthesis of Metallophthalocyanine Covalent Organic Frameworks for CO2 Capture and Conversion

AbstractPhthalocyanines (PCs) are intriguing building blocks owing to their stability, physicochemical and catalytic properties. Although PC‐based polymers have been reported before, many suffer from relatively low stability, crystallinity, and low surface areas. Utilizing a mixed‐metal salt ionothermal approach, we report the synthesis of a series of metallophthalocyanine‐based covalent organic frameworks (COFs) starting from 1,2,4,5‐tetracyanobenzene and 2,3,6,7‐tetracyanoanthracene to form the corresponding COFs named M‐pPPCs and M‐anPPCs, respectively. The obtained COFs followed the Irving–Williams series in their metal contents, surface areas, and pore volume and featured excellent CO2 uptake capacities up to 7.6 mmol g−1 at 273 K, 1.1 bar. We also investigated the growth of the Co‐pPPC and Co‐anPPC on a highly conductive carbon nanofiber and demonstrated their high catalytic activity in the electrochemical CO2 reduction, which showed Faradaic efficiencies towards CO up to 74 % at −0.64 V vs. RHE.