As trategy called ultramicroporous building unit (UBU) is introduced. It allows the creation of hierarchical biporous features that work in tandem to enhance gas uptake capacity and separation. Smaller pores from UBUs promote selectivity,w hile larger inter-UBUp acking pores increase uptake capacity.T he effectiveness of this UBUs trategy is shown with ac obalt MOF (denoted SNNU-45) in which octahedral cages with 4.5 pore sizeserve as UBUs.The C 2 H 2 uptake capacity at 1atm reaches 193.0 cm 3 g À1 (8.6 mmol g À1 ) at 273 Kand 134.0 cm 3 g À1 (6.0 mmol g À1 )at298 K. Suchhigh uptake capacity is accompanied by ahigh C 2 H 2 /CO 2 selectivity of up to 8.5 at 298 K. Dynamic breakthrough studies at room temperature and 1atm show aC 2 H 2 /CO 2 breakthrough time up to 79 min g À1 ,among top-performing MOFs.Grand canonical Monte Carlo simulations agree that ultrahigh C 2 H 2 /CO 2 selectivity is mainly from UBUultramicropores,while packing pores promote C 2 H 2 uptake capacity.

High gas‐uptake capacity is desirable for many reasons such as gas storage and sequestration. Moreover, ultrahigh capacity can enable a practical separation process by mitigating the selectivity factor that sometimes compromises separation efficiency. Herein, a single‐walled nickel–organic framework with an exceptionally high gas capture capability is reported. For example, C2H4 and C2H6 uptake capacities are at record‐setting levels of 224 and 289 cm3 g−1 at 273 K and 1 bar (169 and 110 cm3 g−1 at 298 K and 1 bar), respectively. Such ultrahigh capacities for both gases give rise to an excellent separation performance, as shown for C2H6/C2H4 with breakthrough times of 100, 60 and 30 min at 273, 283 and 298 K and under 1 atm. This new material is also shown to readily remove ethylene released from fruits, and once again, its ultrahigh capacity plays a key role in the extraordinary length of time achieved in the preservation of the fruit freshness.

In this work, the well-defi ned Pt hollow nanospheres with the rough porous surface are synthesized by a facile self-templated approach. The formation of the spherical Pt(II)-urea complex plays a key role in the generation of Pt hollow nanospheres. Sodium formate is employed as the suitable reducing agent for reducing Pt(II)-urea complexes. The hollow structure and the rough porous surface with abundant atomic defects are confi rmed by scanning electron microscopy and transmission electron microscopy, respectively. The CO-stripping experiment reveals that these abundant atomic defects effectually enhance the electrocatalytic activity of the Pt hollow nanospheres for the CO oxidation reaction. Moreover, the low activation energy of the ethanol oxidation reaction (EOR) on the Pt hollow nanospheres indicates that the hollow structure and the rough porous surface are benefi cial kinetically for the EOR in alkaline media. Compared with commercial Pt black, the as-prepared Pt hollow nanospheres show the enhanced electrocatalytic activity and stability for the EOR in alkaline media. In view of the enhanced catalytic activity and the facile self-templated approach, the Pt hollow nanospheres may be a new promising electrocatalyst for alkaline direct ethanol fuel cells.

The phase equilibria of two quaternary systems K ＋ , Rb ＋ //Cl-1/2-C 3 H 7 OH, H 2 O have been investigated at 25 ℃.The liquid-solid phase equilibrium of ternary system KCl＋RbCl＋H 2 O has been determined. The liquid-liquid-solid phase equilibrium of the five different KCl/RbCl mass factions (from 1/0, 0.75/0.25, 0.5/0.5, 0.25/0.75 to 0/1) in the mixed solvent of 1/2-C 3 H 7 OH-H 2 O was investigated. The integrated phase diagrams were drawn for two quaternary systems and the salting effects of the 1/2-C 3 H 7 OH were discussed. The results of the fitting for liquidliquid data by a five-coefficient equation and the tie line data by the Eisen-Joffe equation are reasonable.

The high storage capacity versus high selectivity trade-off barrier presents ad aunting challenge to practical application as an acetylene (C 2 H 2 )a dsorbent. As tructureperformance relationship screening for sixty-two high-performance metal-organic framework adsorbents reveals that am oderate pore sized istribution around 5.0-7.5 is critical to fulfill this task. Aprecise pore space partition approach was involved to partition 1D hexagonal channels of typical MIL-88 architecture into finite segments with pore sizes varying from 4.5 (SNNU-26) to 6.4 (SNNU-27), 7.1 (SNNU-28), and 8.1 (SNNU-29). Coupled with bare tetrazole Nsites (6 or 12 bare Ns ites within one cage) as high-density H-bonding acceptors for C 2 H 2 ,the target MOFs offer agood combination of high C 2 H 2 /CO 2 adsorption selectivity and high C 2 H 2 uptake capacity in addition to good stability.T he optimizedS NNU-27-Fem aterial demonstrates aC 2 H 2 uptake of 182.4 cm 3 g À1 and an extraordinary C 2 H 2 /CO 2 dynamic breakthrough time up to 91 min g À1 under ambient conditions.