期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 20, 页码 23877-23883出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c06241
关键词
acetylene storage; structural switching; stepped sorption isotherms; 2D coordination network; flexible metal-organic material
资金
- Irish Research Council [IRCLA/2019/167]
- Science Foundation Ireland [13/RP/B2549, 16/IA/4624]
- National Science Foundation of China (NSFC) [21531005]
- Programme of Introducing Talents of Discipline to Universities [B18030]
The study explores the C2H2 sorption behavior of a square lattice coordination network and reveals temperature-dependent multistep isotherms. Results show that the material exhibits promising performance for C2H2 storage with high volumetric working capacity and a safe pressure range.
Unlike most gases, acetylene storage is a challenge because of its inherent pressure sensitivity. Herein, a square lattice (sql) coordination network [Cu(4,4'-bipyridine)(2)(BF4)(2)](n) (sql-1-Cu-BF4) is investigated with respect to its C2H2 sorption behavior from 189 to 298 K. The C2H2 sorption studies revealed that sql-1-Cu-BF4 exhibits multistep isotherms that are temperature-dependent and consistent with the transformation from closed (nonporous) to four open (porous) phases induced by the C2H2 uptake. The Clausius-Clapeyron equation was used to calculate the performance of sql-1-Cu-BF4 for C2H2 storage at pressures >1 bar, which revealed that its volumetric working capacity at 288 K is slightly superior to acetone (174 vs 170 cm(3) cm(-3)) over a safer pressure range (1-3.5 vs 1-15 bar). Molecular simulations provided insights into the observed switching phenomena, revealing that the layer expansion of sql-1-Cu-BF4 occurs via intercalation and inclusion of C2H2. These results indicate that switching adsorbent layered materials offer promise for utility in the context of C2H2 storage and delivery.
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