University of Bremen, Advanced Ceramics, Am Biologischen Garten 2, IW3, 28359 Bremen, Germany.
University of Bremen, Advanced Ceramics, Am Biologischen Garten 2, IW3, 28359 Bremen, Germany.
J Colloid Interface Sci. 2019 Apr 15;542:91-101. doi: 10.1016/j.jcis.2019.01.087. Epub 2019 Jan 22.
Recently, hierarchical porous materials have received tremendous attention in electrochemical supercapacitors and CO adsorption. Both areas of application have a positive impact on global warming by reducing CO emissions to the atmosphere. Herein, we synthesized new silica-based ceramic monoliths composed of polysiloxane microspheres sheathed by carbon allotropes (Graphene or MWCNT) and metal nanoparticles. The as-synthesized hybrid ceramics show a high specific surface area of 540 m g with hierarchical micro-/meso-/macroporous structures. With the structural benefits, the obtained ceramics exhibits excellent performance in supercapacitors and for CO adsorption as probed in this study. As an electrode material for supercapacitor, the hybrid ceramics delivered the specific capacitance of 93 F/g at 2 mV s in 0.5 M KOH electrolyte solution with a capacity retention of 88% after 50 cycles. Further, as a solid adsorbent, the hybrid ceramics shows the maximum CO adsorption capacity of 2 mmol g at 100 kPa equilibrium pressure and 303 K, while maintaining 98% capacity retention after 10 cycles. Thus, the hybrid ceramics with its unusual properties make them a promising candidate for both, supercapacitors and CO capture in the sheer physical adsorption process.
最近，在电化学超级电容器和 CO 吸附领域，分层多孔材料受到了极大的关注。这两个应用领域都通过减少向大气排放 CO 对全球变暖产生了积极影响。在此，我们合成了由聚硅氧烷微球（被碳的同素异形体（石墨烯或 MWCNT）和金属纳米颗粒包裹）组成的新型硅基陶瓷整体式材料。所合成的混合陶瓷具有 540m²/g 的高比表面积和分级的微/介/大孔结构。由于具有这种结构优势，所获得的陶瓷在超级电容器和 CO 吸附方面表现出了优异的性能，这在本研究中得到了证实。作为超级电容器的电极材料，该混合陶瓷在 0.5M KOH 电解质溶液中以 2mV/s 的扫速下表现出 93F/g 的比电容，经过 50 次循环后，电容保持率为 88%。此外，作为一种固体吸附剂，该混合陶瓷在 100kPa 平衡压力和 303K 下表现出 2mmol/g 的最大 CO 吸附容量，并且在 10 次循环后保持 98%的容量保留率。因此，这种具有特殊性能的混合陶瓷在超级电容器和纯粹的物理吸附过程中 CO 捕获方面都具有广阔的应用前景。
