Poly(vinylidene chloride)-Based Carbon with Ultrahigh Microporosity and Outstanding Performance for CH₄ and H₂ Storage and CO₂ Capture

Abstract

Poly(vinylidene chloride)-based carbon (PC) with ultrahigh microporisity was prepared by simple carbonization and KOH activation, exhibiting great potential to be superior CO2, CH4, and H2 adsorbent at high pressures. The CO2 uptake for pristine PC is highly up to 3.97 mmol/g at 25 °C and 1 bar while the activated PC exhibits a slightly lower uptake at 1 bar. However, the activated PC has an outstanding CO2 uptake of up to 18.27 mmol/g at 25 °C and 20 bar. Gas uptakes at high pressures are proportional to the surface areas of carbons. The CH4 uptake for the activated PC is up to 10.25 mmol/g (16.4 wt % or 147 v/v) at 25 °C and 20 bar which is in a top-ranked uptake for large surface area carbons. Furthermore, H2 uptake on the activated PC reaches 4.85 wt % at -196 °C and 20 bar. Significantly, an exceptionally large H2 storage capacity of up to 2.43 wt % at 1 bar was obtained, which is among the largest value reported to date for any porous adsorbents, to the best of our knowledge. The ease of preparation and large capture capacities endow this kind of carbon attractive as promising adsorbent for CH4, H2, and CO2 storage.

Cross-linked polymer-derived B/N co-doped carbon materials with selective capture of CO2

“…7d) were estimated based on adsorption data collected at different temperature (273 and 298 K), which are among the highest values for the carbon materials used in CO 2 uptake. 43 These isosteric heat values are increased in a sequence of PPs-BN-2-800 (39.0 kJ mol −1 ) > PPs-BN-1-800 (37.5 kJ mol −1 ) > PPs-BN-3-800 (34.8 kJ mol −1 ), in consistent with their capabilities for capturing CO 2 . Thanks to the relatively low surface areas, the loading amount of CO 2 by the as-prepared B/N co-doped porous materials can be taken into account in a higher level, comparable to a lot of heteroatom-doped porous materials with much higher surface areas.…”

High Performance N‐Doped Carbon Electrodes Obtained via Hydrothermal Carbonization of Macroalgae for Supercapacitor Applications

“…The N 2 isotherms exhibited a typical behaviour for a microporous material (Figure a). The absence of hysteresis loop in the isotherms indicated high percentage of micropores with small fraction of mesopores ,. AHC‐ 600 showed the highest ratio of micropores, but the lowest surface area, of 952 m 2 /g (Figure a).…”

“…The x‐ray diffraction patterns (XRD) of the hydrothermal N‐doped carbons AHC‐ y (where y represents the activation temperature) (Figure S1a) exhibited two broad very weak bands at 23 and 44° 2θ. These corresponded to the (002) and (100) reflections, typically observed in carbons ,. However, the low intensity and broadness of the two peaks indicated a low degree of graphitization for the carbons produced.…”

Porous carbon derived via KOH activation of a hypercrosslinked porous organic polymer for efficient CO2, CH4, H2 adsorptions and high CO2/N2 selectivity

“…Moreover, the KOH activated carbon shows weak and less intense peak at ca. 23.0°of 2θ compared to non activated carbon, indicating KOH activation could inhibit the graphitization of carbon to some extent [29]. Field emission scanning electron microscopic (FESEM) images showed the formation of ca.…”