Synergistic Binary Fe–Co Nanocluster Supported on Defective Tungsten Oxide as Efficient Oxygen Reduction Electrocatalyst in Zinc‐Air Battery

Abstract

Rational design of metal oxide supported non-precious metals is essential for the development of stable and high-efficiency oxygen reduction reaction (ORR) electrocatalysts. Here, an efficient ORR catalyst consisting of binary Fe/Co nanoclusters supported by defective tungsten oxide and embedded N-doped carbon layer (NC) with a 3D ordered macroporous architecture (3DOM Fe/Co@NC-WO 2−x ) is developed. The oxygen deficient 3DOM WO 2−x not only serves as a porous and stable support, but also enhances the conductivity and ensures good dispersion of the binary Fe/Co nanocluster, benefiting its ORR catalytic activity. Theoretical calculation shows that there exists a synergistic effect of electron transfer from Fe to Co in the supported binary Fe/Co cluster, promoting the ORR reaction energetics. Accordingly, the 3DOM Fe/Co@NC-WO 2−x catalyst exhibits excellent ORR activity in alkaline medium with a half wave potential (E 1/2 ) of 0.87 V higher than that of Pt/C (0.85 V). The zinc-air batteries assembled by 3DOM Fe/Co@NC-WO 2−x cathode deliver a higher power density and specific capacity than that of Pt/C. A new strategy of combining synergistic binary-metal nanoclusters and conductive metal oxide support design is provided here to develop efficient and durable ORR electrocatalyst.

Alloying Co Species into Ordered and Interconnected Macroporous Carbon Polyhedra for Efficient Oxygen Reduction Reaction in Rechargeable Zinc–Air Batteries

“…[22,23] The C 1s spectrum shows the existence of OCO group (288.2 eV), CO bonds (286.2 eV), CN bonds (285.5 eV), and sp 2 -hybridized carbon (284.6 eV) (Figure 3f). [24,25] The mass content of Fe 0.5 Co in the Fe 0.5 Co@HOMNCP composite was determined by thermogravimetric analysis and calculated to be ≈34.24% (Figure 3b; Figure S8, Supporting Information), which was also close to the inductively coupled plasma-atomic emission spectroscopy results (39.4%, Table S2, Supporting Information). The bonding structure of the carbon was studied using Raman spectroscopy.…”

Vanadium‐Incorporated CoP2 with Lattice Expansion for Highly Efficient Acidic Overall Water Splitting

“…Besides, the O XPS spectrum displays an obvious increased intensity of peak belonging to the adsorbed H 2 O (Figure 5h), suggesting the H 2 O adsorption ability is improved. Importantly, a new peak appears at 532.5 eV assigned to the oxygen vacancy, [46] which often plays a significant role in boosting OER activity. [47] Thus, we infer the reason that V promotes the activity and stability of CoP 2 as follows: V possesses multiple valences.…”

Biomimetic FeCo@PDA nanozyme platform with Fenton catalytic activity as efficient antibacterial agent

“…In previous reports, we understand that the addition of cobalt to iron-based catalysts can significantly increase the catalytic activity of ammonia synthesis compared to iron-based catalysts with a single metal. 36–38…”

“…In previous reports, we understand that the addition of cobalt to iron-based catalysts can significantly increase the catalytic activity of ammonia synthesis compared to iron-based catalysts with a single metal. [36][37][38] In this study, taking inspiration from mussel adhesion proteins, a multi-mechanism synergistic sterilization system (FeCo@PDA NPs) was constructed by simultaneously loading bimetallic Fe 2+ /Co 2+ on PDA microspheres (Scheme 1). The composition of FeCo@PDA can be divided into two main points.…”

“…This journal is © The Royal Society of Chemistry 2022 Specifically, firstly the bacterial membrane is destroyed and endogenous H 2 O 2 is released under the physical destruction of PDA NPs and Co 2+ , 25,[42][43][44][45] then the released H 2 O 2 produces a large amount of reactive oxygen species under the synergistic catalysis of Fe 2+ /Co 2+ , which finally results in complete killing of the bacteria. [36][37][38] The results of the antibacterial activity test showed that the multi-mechanism synergistic antibacterial effect of bimetal loading was significantly better than that of single metal loading. In addition, the cytocompatibility experiment showed that the FeCo@PDA NPs also had obvious biocompatibility, which proved the biosafety properties.…”