Suchergebnisse

This multi-authored book provides a comprehensive overview of the latest developments in porous CO2 capture materials, including ionic liquid-derived carbonaceous adsorbents, porous carbons, metal-organic frameworks, porous aromatic frameworks, micro porous organic polymers. It also reviews the sorption techniques such as cyclic uptake and desorption reactions and membrane separations. In each category, the design and fabrication, the comprehensive characterization, the evaluation of CO2 sorption/separation and the sorption/degradation mechanism are highlighted. In addition, the advantages and

Introduction / De-en Jiang, Shannon M. Mahurin, and Sheng Dai -- CO₂ capture and separation of metal-organic frameworks / Xueying Ge and Shengqian Ma -- Porous carbon materials : designed synthesis and CO₂ capture / Xiang-Qian Zhang and An-Hui Lu -- Porous aromatic frameworks for carbon dioxide capture / Teng Ben and Shilun Qiu -- Virtual screening of materials for carbon capture / Aman Jain, Ravichandar Babarao, and Aaron W. Thornton -- Ultrathin membranes for gas separation / Ziqi Tian, Song Wang, Sheng Dai, and De-en Jiang -- Polymeric membranes / Jason E. Bara and W. Jeffrey Horne -- Carbon membranes for CO₂ separation / Kuan Huang and Sheng Dai -- Composite materials for carbon captures / Sunee Wongchitphimon, Siew Siang Lee, Chong Yang Chuah, Rong Wang, and Tae-Hyun Bae -- Poly(amidoamine) dendrimers for carbon capture / Ikuo Taniguchi -- Ionic liquids for chemisorption of CO₂ / Mingguang Pan and Congmin Wang -- Ionic liquid-based membranes / Chi-Linh Do-Thanh, Jennifer Schott, Sheng Dai, and Shannon M. Mahurin.

Highly active, low-cost, and durable electrocatalysts for the water oxidation reaction are pivotal in energy conversion and storage schemes. Here we report a nitride-core, oxide-shell-armor structured FeCoNi oxynitride as an efficient oxygen evolution electrocatalyst with a homogeneous nitride (Fe0.70Co0.56Ni0.92N1.0O0.06) core and an oxide (Fe0.48Co0.1Ni0.21N0.05O1.0) shell. The catalyst demonstrated excellent activity for the oxygen evolution reaction with a current density of 10 mA cm(-2) at a low overpotential of 0.291 V in alkaline media (1 M KOH), which is superior to the activities of commercial IrO2, RuO2, and Pt/C catalysts and comparable to those of state-of-the-art catalysts (e.g., NiFe-LDH, NiCo2O4, O-NiCoFe-LDH). Density functional theory simulations suggested that the incorporation of multiple metal elements can indeed improve the reaction energetics with a synergistic effect from the core-shell structure. This unique structure of a nitride-core with a oxide-shell presents a new form of multimetallic oxynitride with compelling performance in electrolytic oxygen evolution. ; Public domain authored by a U.S. government employee

AbstractMethane clathrates on continental margins contain the largest stores of hydrocarbons on Earth, yet the role of biomolecules in clathrate formation and stability remains almost completely unknown. Here, we report new methane clathrate-binding proteins (CbpAs) of bacterial origin discovered in metagenomes from gas clathrate-bearing ocean sediments. CbpAs show similar suppression of methane clathrate growth as the commercial gas clathrate inhibitor polyvinylpyrrolidone and inhibit clathrate growth at lower concentrations than antifreeze proteins (AFPs) previously tested. Unlike AFPs, CbpAs are selective for clathrate over ice. CbpA3 adopts a nonglobular, extended structure with an exposed hydrophobic surface, and, unexpectedly, its TxxxAxxxAxx motif common to AFPs is buried and not involved in clathrate binding. Instead, simulations and mutagenesis suggest a bipartite interaction of CbpAs with methane clathrate, with the pyrrolidine ring of a highly conserved proline residue mediating binding by filling empty clathrate cages. The discovery that CbpAs exert such potent control on methane clathrate properties implies that biomolecules from native sediment bacteria may be important for clathrate stability and habitability.