Über die Quellung von Graphit

Abstract

1. Bei der Quellung von Graphit mit oxydierenden Stoffen — besonders mit rauchender Schwefelsäure (H2S2O7) — beobachtet man, daß im reflektierten Licht eine Reihe von Farben auftritt. Bei unvollständig gequollenem Graphit folgen sie vom Rande der Lamellen her in der Reihe: Blau, Indigo, Violett, Rot, Orange, Gelb und Grau.

Storylines in intercalation chemistry

“…88.) It is worth noting that Rüdorff and Hoffman 29 already used electrointercalation for the preparation of the sulfuric acid intercalation of graphite, Thiele 89 used electrochemical oxidation for the formation of GO and Rüdorff 2 and Hennig 3 and their coworkers for the electrochemical intercalation of alkylammonium ions from liquid ammonia and amines.…”

“…A prerequisite of these investigations is that the samples under investigation are electronic conductors. Interesting examples of the preparation of new compounds are the just mentioned electrointercalation processes [84][85][86][87][88][89] or the synthesis of organic metals (e.g. the PAH salts, the tetramethyltetraselenafulvalene salts (the so-called Bechgaard salts), the bis-ethylenedithia-tetrathiafulvalene (ET) salts 93 ) or the synthesis of conducting polymers (i.e.…”

Different modes and consequences of electron transfer in intercalation compounds

“…In electrically conducting hosts it is easy to carry out the intercalation by electrochemical electron transfer. Whereas the phenomenon of 'anodic swelling' of graphite has been observed as early as 1932 [48], electrointercalation has received more attention since 1970. After the first successful electrointercalation reactions in the layered dichalcogenides [49 -51] it was recognized soon that the intercalation compounds are mixed electron/ion conductors and that some conventional battery electrodes behave like intercalating solids [10,52].…”

Iron nanoparticle templates for constructing 3D graphene framework with enhanced performance in sodium-ion batteries

“…Anodic graphite oxidation reactions have been investigated and results were published since 1930s, and developed tremendously in recent years. [78][79][80] In electrochemical approaches, the oxidation potential can be regulated giving control over the oxidation process. In addition, no oxidant is needed and therefore, certain impurities are avoided.…”