Spatially confined synthesis of a flexible and hierarchically porous three-dimensional graphene/FeP hollow nanosphere composite anode for highly efficient and ultrastable potassium ion storage

Abstract

A hierarchical, porous, three-dimensional graphene encapsulated FeP hollow nanosphere composite was constructed as a flexible free-standing electrode for KIBs. The formation of the hollow structure and the conversion reaction were elucidated.

Achieving High‐Performance Metal Phosphide Anode for Potassium Ion Batteries via Concentrated Electrolyte Chemistry

“…Meanwhile, the CuP 2 @CNSs were also compared with the reported state‐of‐the‐art anodes, as shown in Figure 2c, where the as‐prepared metal phosphide using 4M KFSI in DME is among one of the highest‐performance anodes in terms of reversible capacity and cycling stability (Table S2, Supporting Information). [ 27–34 ]…”

Recent progress in metal–organic framework/graphene-derived materials for energy storage and conversion: design, preparation, and application

“…Other MOF/graphene nanocomposites with sophisticated structures and superior properties have also been synthesized using this method. 38,41,44,45,60,62,63,112 To date, although a large number of MOF/graphene composites have been synthesized and applied in many elds, the MOF types in these materials are very limited, as a lot of work has focused on some common and pristine MOFs, such as Zn-MOF, Fe-MOF, Co-MOF, Ni-MOF, Cu-MOF, and Zr-MOF. The exploration of other pristine MOFs (e.g.…”

“…Generally, MOF/graphene derived metal phosphides are prepared through a phosphorization process in a tube furnace by using MOF/graphene or the metal/oxide derived from it as a precursor and NaH 2 PO 2 as a phosphorus source. 91,98,111,112,[162][163][164][165][166][167][168][169][170] Typically, the precursor and NaH 2 PO 2 are placed in two separate positions in a porcelain boat with NaH 2 PO 2 at the upstream side. Then the samples are heated to a certain temperature under an inert gas ow.…”

“…9c-e). 112 Such unique structures combined the 3D interconnected conductive network, discrete hollow nanoparticles, and graphene encapsulation effect together, which would promote charge transport and alleviate the volume change, imparting excellent potassium ion storage performance. The formation mechanism of hollow FeP was based on the nanoscale Kirkendall effects of PB shown in Fig.…”

“…13i and j). Besides, like LIBs and SIBs, some metal compound hybrids with distinguished structures derived from MOF/graphene composites (e.g., hierarchically porous 3DG/FeP aerogel, 112 RGO wrapped FeS 2 hollow nanocages, 146 graphene encapsulated Co 0.85 Se hollow cubes, 220 and multicompositional ZnSe-FeSe 2 /RGO composites 88 ) were explored as anode materials for PIBs. In particular, the exible 3DG/FeP anode with hollow FeP nanospheres encapsulated within a 3D graphene skeleton delivered a high reversible capacity of 323 mA h g À1 at 0.1 A g À1 and ultrastable cycle life with a capacity retention of 97.6% at 2 A g À1 aer 2000 cycles (Fig.…”