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[ASAP] Gold Nanoparticles Immobilized in Porous Aromatic Frameworks with Abundant Metal Anchoring Sites as Heterogeneous Nanocatalysts
High loading of single atomic iron sites in Fe–NC oxygen reduction catalysts for proton exchange membrane fuel cells
Nature Catalysis, Published online: 25 April 2022; doi:10.1038/s41929-022-00772-9
Single-atom catalysts consisting of isolated iron sites on a nitrogen-doped carbon matrix (Fe–N–C) are very promising cathode catalysts for proton exchange membrane fuel cells (PEMFC), but it is challenging to achieve a high density of single iron sites. Now, a synthetic approach is introduced to afford high-density Fe–N–C catalysts with a high PEMFC performance.A Graphite∥PTCDI Aqueous Dual‐Ion Battery
Energy storage: An aqueous concentrated electrolyte comprising 5 m MgCl2 and 5 m tributylmethylammonium chloride (TBMACl) is demonstrated to construct a graphite∥3,4,9,10-perylenetetracarboxylic diimide (PTCDI) full cell dual-ion battery. The addition of TBMACl into saturated aqueous MgCl2 solution renders the formation of [MgCl3]−, which serves as an active charge carrier for the graphite cathode. Reversible storage of bulky TBMA+ in the PTCDI anode is observed. A full cell delivers the initial reversible capacity of 41 mAh g−1 based on the mass of both electrodes and shows stable cycling over 400 cycles.
Abstract
A full cell chemistry of aqueous dual-ion battery (DIB) was reported, comprising the graphite cathode and 3,4,9,10-perylenetetracarboxylic diimide (PTCDI) as the anode. This DIB employed a mixture aqueous electrolyte: 5 m tributylmethylammonium (TBMA) chloride plus 5 m MgCl2, where [MgCl3]− and TBMA+ serve as the charge carriers for cathode and anode of the DIB, respectively. This novel full cell exhibited a specific capacity of around 41 mAh g−1 based on the total active mass of both electrodes with an average operation voltage of 1.45 V and stable cycling for 400 cycles.