Template-assisted synthesis of high-efficiency bifunctional catalysts with roller-comb-like nanostructure for rechargeable zinc-air batteries

1D confined materials synthesized via a coating method for thermal catalysis and energy storage applications

“…91,92 Particularly, ZIF-8 and ZIF-67 were simultaneously coated upon PPY NTs which were synthesized via the soft template method and pre-functionalized by SDS to form 1D PPY@ZIF-8/ZIF-67 which underwent carbonization to yield Zn x Co y @N–C. 91 The concurrent growth of these two MOFs decreases their particle size and the particle size of Zn and Co, therefore increasing their distribution density on CNTs derived from PPY NTs. Additionally, a large amount of micro-CNTs were also formed as a result of the co-deposition of Zn and Co, increasing the connectivity among active sties.…”

“…Carbon materials can be synthesized using various carbon precursors such as diverse polymers, [83][84][85] glucose, [86][87][88][89][90] and MOFs 58,91,92 followed by the subsequent carbonization process in an inert atmosphere. Additionally, they can also be prepared by covering the guest materials with pre-synthesized carbon materials such as GO/rGO.…”

“…ZIF-8 and ZIF-67) which contain 2-methylimidazolate (2-MIm) linkers can be applied to prepare N-C conned materials. 58,91,92 To prepare 1D carbon conned materials using MOFs as the precursor, selfassembly/heterogeneous nucleation of MOF precursors around the surface of the pre-synthesized 1D guest materials is crucial. To achieve this, these guest materials usually need to be functionalized by surfactants such as PVP and CTAB to enhance their affinity with MOF precursors via coordination interactions between pyrrolidone rings in PVP and zinc atoms in ZIF nodes as well as the interactions between hydrophobic groups in surfactants and the organic linkers in MOFs.…”

“…For example, bi-functional catalysts derived from ZIF-8 and ZIF-67 MOFs have been proved efficient for Zn-air batteries. 91,92 Particularly, ZIF-8 and ZIF-67 were simultaneously coated upon PPY NTs which were synthesized via the so template method and pre-functionalized by SDS to form 1D PPY@ZIF-8/ZIF-67 which underwent carbonization to yield Zn x Co y @N-C. 91 The concurrent growth of these two MOFs decreases their particle size and the particle size of Zn and Co, therefore increasing their distribution density on CNTs derived from PPY NTs. Additionally, a large amount of micro-CNTs were also formed as a result of the co-deposition of Zn and Co, increasing the connectivity among active sties.…”

ZIF-67-derived nanoframes as efficient bifunctional catalysts for overall water splitting in alkaline medium

“…However, the problem to be resolved is that the kinetic processes for the HER and OER are slow, and thus the overall reaction efficiency is low. [11][12][13][14] Pt is the most effective catalyst for the HER so far, and RuO 2 or IrO 2 are the most effective OER electrocatalysts, although their commercial use is limited because of their expense, natural scarcity and lack of long-term durability. [15][16][17] As a result, further research should focus on the search for abundant transition metals to replace these precious metal catalysts, and the development of a low cost, stable and efficient bifunctional electrocatalyst remains an urgent but difficult task.…”