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Synthetic Architecture of MgO/C Nanocomposite from Hierarchical-Structured Coordination Polymer toward Enhanced CO₂ Capture

Lookup NU author(s): Dr Paul Liu

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Abstract

Highly efficient, durable, and earth-abundant solid sorbents are of paramount importance for practical carbon capture, storage, and utilization. Here, we report a novel and facile two-step strategy to synthesize a group of hierarchically structured porous MgO/C nanocomposites using flowerlike Mg-containing coordination polymer as a precursor. The new nanocomposites exhibit superb CO₂ capture performance with sorption capacity up to 30.9 wt % (at 27 °C, 1 bar CO₂), fast sorption kinetics, and long cycling life. Importantly, the achieved capacity is >14 times higher than that of commercial MgO, and favorably exceeds the highest value recorded to date for MgO-based sorbents under similar operating conditions. On the basis of the morphological and textural property analysis, together with CO₂ sorption mechanism study using CO₂-TPD and DRIFT techniques, the outstanding performance in CO₂ uptake originates from unique features of this type of sorbent materials, which include hierarchical architecture, porous building blocks of nanosheets, high specific surface area (ca. 300 m²/g), evenly dispersed MgO nanocrystallites (ca. 3 nm) providing abundant active sites, and the in situ generated carbon matrix that acts as a stabilizer to prevent the growth and agglomeration of MgO crystallites. The nanocomposite system developed in this work shows good potential for future low-cost CO₂ abatement and utilization.

Publication metadata

Author(s): Li P, Liu W, Dennis JS, Zeng HC

Publication type: Article

Publication status: Published

Journal: ACS Applied Materials & Interfaces

Year: 2017

Volume: 9

Issue: 11

Pages: 9592-9602

Print publication date: 09/03/2017

Online publication date: 01/03/2017

Acceptance date: 01/03/2017

ISSN (electronic): 1944-8252

Publisher: American Chemical Society

URL: http://doi.org/10.1021/acsami.6b14960

DOI: 10.1021/acsami.6b14960

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