Tailoring the MOF structure via ligand optimization afforded a dandelion flower like CoS/Co–N_x/CoNi/NiS catalyst to enhance the ORR/OER in zinc–air batteries

Abstract

Due to their affordability and good catalytic activity for oxygen reactions, MOF-derived carbon composites containing metal alloys have piqued interest. However, during synthesis, MOFs have the disadvantage of causing significant...

Acid Etching Strategy: Optimizing Bifunctional Activities of Metal/Nitrogen‐doped Carbon Catalysts for Efficient Rechargeable Zn‐Air Batteries

“…The high surface area and abundant pore volume after acid treatment prove that the acid etching can optimize the mass including electrolyte and oxygen transfer channels, which is beneficial for ORR and OER activities. [28] After determining the physical property, the electrochemical activities of NiCoFeÀ NC with different acid treatment time were acquired by using a three-electrode system, in which catalysts coated glassy carbon electrode, graphite rod, and Hg/HgO serves as working, counter, and reference electrodes, respectively. First, ORR activities of NiCoFeÀ NCs with different acid etching times were investigated by cyclic voltammetry (CV) in O 2 -and N 2 -saturated 0.1 M KOH solutions.…”

“…As shown in Figure 2f, the mesopore volume of NiCoFe−NC‐30 is higher than that of NiCoFe−NC‐0, especially when the pore diameter is lower than 10 nm. The high surface area and abundant pore volume after acid treatment prove that the acid etching can optimize the mass including electrolyte and oxygen transfer channels, which is beneficial for ORR and OER activities [28] …”

3D Hierarchical MOF-Derived Defect-Rich NiFe Spinel Ferrite as a Highly Efficient Electrocatalyst for Oxygen Redox Reactions in Zinc–Air Batteries

“…28,29 To create dandelion flower-like architectures, we previously described tailoring the CoNi@MOF structure by flexible 4aminodiacetic terephthalic acid with 4,4′-bipyridine and aromatic carboxylic acids with an iminodiacetate functionality. 30,31 In addition, an efficient strategy was developed to enhance the kinetics of MOF-derived catalysis via tuning cation vacancies/defects and cation doping, which is expected to modulate the electronic structure of bifunctional electrocatalysts and thus achieve high performance toward ORR and OER. Unfortunately, metal defects have a much higher formation energy than oxygen defects.…”

Dual‐laser pulse‐patterned α‐Co(OH)2/rGO heterointerface for accelerated water oxidation and surface phase‐transition via in‐situ Raman spectroscopy

“…Thus, inexpensive metal-based catalysts have been extensively investigated, including metal oxides, sulfides, nitrides, hydroxides, and phosphides, which can operate in alkaline solutions concurrently and meet the criteria for intrinsic behavior and electrochemical stability. [11][12][13][14][15] Heterointerface engineering has emerged as one of the most effective strategies for overcoming the limitations of electrochemical activity and enhancing the intrinsic activity of catalysts. Through heterostructure assembly, this approach facilitates the creation of active sites and the regulation of electronic structures, harnessing the synergistic effect of multicomponent materials.…”

“…The benchmark OER electrocatalysts are iridium and ruthenium‐composed oxides, but their prevalent use is constrained by their limited availability, high cost, and less stability. Thus, inexpensive metal‐based catalysts have been extensively investigated, including metal oxides, sulfides, nitrides, hydroxides, and phosphides, which can operate in alkaline solutions concurrently and meet the criteria for intrinsic behavior and electrochemical stability 11–15 . Heterointerface engineering has emerged as one of the most effective strategies for overcoming the limitations of electrochemical activity and enhancing the intrinsic activity of catalysts.…”