Hydrogen and carbon dioxide uptake on scalable and inexpensive microporous carbon foams
Hydrogen and carbon dioxide uptake on scalable and inexpensive microporous carbon foams
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DOI：
10.1016/j.micromeso.2022.112141
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发表时间：
2022-09
影响因子：
5.2
通讯作者：
Muhammad Irfan Maulana Kusdhany;Zhong-Hua Ma;A. Mufundirwa;Haiwen Li;K. Sasaki;A. Hayashi;S. Lyth
中科院分区：
文献类型：
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作者：
Muhammad Irfan Maulana Kusdhany;Zhong-Hua Ma;A. Mufundirwa;Haiwen Li;K. Sasaki;A. Hayashi;S. Lyth
采用金属醇氧化物一步热分解法制备了克级级多孔泡沫碳（CF）和微孔氮掺杂泡沫碳（NCF）。CF的总吸氢量在77 K和9.5 MPa时达到最大值11.0 wt%（或在3.9 MPa时超出5.2 wt%）。这种高吸收量归因于大表面积（3452 m2/g）和孔体积（2.19 cm3/g）。即使在室温下，总氢气吸收率也达到2.50 wt%（或超过0.94 wt%）。氮掺杂导致在较高压力下较低的氢吸收率，由于较低的表面积。然而有趣的是，与CF相比，NCF在较低压力下获得的氢气吸收率略有提高，我们将其归因于更窄的孔径。同时，在273 K、0.5 MPa条件下，CF的co2吸收量为15.2 mmol/g。NCF的CO2吸收量略低，但CO2/ n2和CO2/ h22选择性较高。这是由于二氧化碳和氮掺杂碳表面之间的等等吸附热增加。这项工作显示了大量合成低成本金属烷氧化物衍生的碳泡沫在气体储存和分离应用中的潜力。
Hierarchically porous carbon foam (CF) and microporous nitrogen doped carbon foam (NCF) were synthesized at gram scale via the one-step thermal decomposition of metal alkoxides. The total hydrogen uptake of CF reached a maximum of 11.0 wt% at 77 K and 9.5 MPa (or 5.2 wt% excess at 3.9 MPa). This large uptake is attributed to large surface area (3452 m2/g) and pore volume (2.19 cm3/g). Even at room temperature, the total hydrogen uptake reached 2.50 wt% (or 0.94 wt% excess). Nitrogen doping resulted in lower hydrogen uptake at higher pressure, due to the lower surface area. Interestingly however, slightly improved hydrogen uptake was obtained in NCF at lower pressure compared to CF, and we attribute this to the narrower pore size. Meanwhile, the CO2uptake of CF was 15.2 mmol/g at 273 K and 0.5 MPa. The CO2uptake of NCF was slightly lower, but the CO2/N2and CO2/H2selectivity were higher. This was attributed to increased isosteric heat of adsorption between CO2and the nitrogen-doped carbon surface. This work shows the potential of bulk-synthesized low-cost metal alkoxide-derived carbon foams to be used in gas storage and separation applications.