A <b>Δ</b><i>E</i> = 0.63 V Bifunctional Oxygen Electrocatalyst Enables High‐Rate and Long‐Cycling Zinc–Air Batteries

Chang-xin, Zhao; Liu, Jia‐Ning; Wang, Juan; Ren, Ding; Yu, Jingkun; Chen, Xiao; Li, Bo‐Quan; Zhang, Qiang

doi:10.1002/adma.202008606

Cited by 191 publications

(118 citation statements)

References 75 publications

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“…[17][18][19][20] Li and colleagues report that the combination of LDH material and CoNC catalyst through ultrasound can significantly improve the OER performance of the catalyst. [5] However, the uniformity and stability of the composite catalyst obtained by ultrasonic mixing are usually not very good.…”

Section: Introductionmentioning

confidence: 99%

FeCo Nanoparticles Encapsulated in N‐Doped Carbon Nanotubes Coupled with Layered Double (Co, Fe) Hydroxide as an Efficient Bifunctional Catalyst for Rechargeable Zinc–Air Batteries

Zhang

Bian

Zhu

et al. 2021

Small

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Low‐cost bifunctional nonprecious metal catalysts toward oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) are critical for the commercialization of rechargeable zinc–air batteries (ZABs). However, the preparation of highly active and durable bifunctional catalysts is still challenging. Herein, an efficient catalyst is reported consisting of FeCo nanoparticles embedded in N‐doped carbon nanotubes (FeCo NPs‐N‐CNTs) by an in situ catalytic strategy. Due to the encapsulation and porous structure of N‐doped carbon nanotubes, the catalyst shows high activity toward ORR and excellent durability. Furthermore, to enhance the OER activity, CoFe‐layer double hydroxide (CoFe‐LDH) is coupled with FeCo NPs‐N‐CNTs by in situ reaction approach. As the air electrode for rechargeable ZABs, the cell with CoFe‐LDH@FeCo NPs‐N‐CNTs catalyst exhibits high open‐circuit potential (OCP) of 1.51 V, high power density of 116 mW cm−2, and remarkable durability up to 100 h, demonstrating its great promise for the practical application of the rechargeable ZABs.

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Section: Introductionmentioning

confidence: 99%

FeCo Nanoparticles Encapsulated in N‐Doped Carbon Nanotubes Coupled with Layered Double (Co, Fe) Hydroxide as an Efficient Bifunctional Catalyst for Rechargeable Zinc–Air Batteries

Zhang

Bian

Zhu

et al. 2021

Small

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“…state, coordination architecture, and spin state of Mössbaueractive elements, especially suitable for Fe SACs. [145][146][147][148][149][150] In Figure 4c, Dai and co-workers recorded the 57 Fe Mössbauer spectrum of SA-Fe-HPC, which was deconvoluted into two doublets arising from Fe-N x moieties in a low-and medium-spin states. [139] Electron paramagnetic resonance (EPR) spectroscopy is another powerfully progressive technique characterizing unpaired electron spins for SACs.…”

Section: Structure Characterization Of Sacsmentioning

confidence: 99%

mentioning

confidence: 99%

Recent Developments of Microenvironment Engineering of Single‐Atom Catalysts for Oxygen Reduction toward Desired Activity and Selectivity

Huang

Tang

et al. 2021

Adv Funct Materials

108

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Oxygen reduction reaction (ORR) is an essential process for sustainable energy supply and sufficient chemical production in modern society. Singleatom catalysts (SACs) exhibit great potential on maximum atomic efficiency, high ORR activity, and stability, making them attractive candidates for pursuing next-generation catalysts. Despite substantial efforts being made on building diversiform single-atom active sites (SAASs), the performance of the obtained catalysts is still unsatisfactory. Fortunately, microenvironment regulation of SACs provides opportunities to improve activity and selectivity for ORR. In this review, first, ORR mechanism pathways on N-coordinated SAAS, electrochemical evaluation, and characterization of SAAS are displayed. In addition, recent developments in tuning microenvironment of SACs are systematically summarized, especially, strategies for microenvironment modulation are introduced in detail for boosting the intrinsic 4e − /2e − ORR activity and selectivity. Theoretical calculations and cutting-edge characterization techniques are united and discussed for fundamental understanding of the synthesis-construction-performance correlations. Furthermore, the techniques for building SAAS and tuning their microenvironment are comprehensively overviewed to acquire outstanding SACs. Lastly, by proposing perspectives for the remaining challenges of SACs and infant microenvironment engineering, the future directions of ORR SACs and other analogous procedures are pointed out.

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Section: Opportunities and Challengesmentioning

confidence: 99%

Designed Synthesis and Catalytic Mechanisms of Non‐Precious Metal Single‐Atom Catalysts for Oxygen Reduction Reaction

Tong

Wang

2021

Small Methods

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ORR is proceeded through a two-electron (2e − ) or four-electron (4e − ) pathway. [2][3][4][5] Due to the requirement of high energy conversion efficiency for energy devices, the 4e − pathway directly reducing O 2 to H 2 O is the ideal reaction process. Heretofore, precious metal Pt is still considered as an excellent catalyst for high-efficiency 4e − pathway. [6] However, the high-cost and scarcity limit the extensive use of Pt in practical applications. Thus, development of low-cost and non-precious metal catalysts for energy devices is an intuitively effective strategy.According to the principle that the active sites can be increased by reducing the geometry size, single-atom catalysts (SACs) could expose abundant active sites with maximum atomic utilization and unique physico-chemical properties. [7] It has been presented as a kind of new catalyst members and shows more excellent activity, selectivity, and stability compared with traditional catalysts. Since Thomas et al. first discovered the SACs in 1995, the SACs have been attracting a great deal of attention. [8] In 2000, Heiz et al. prepared SACs containing ≈1-30 Pd atoms for catalyzing acetylene cyclization polymerization reactions. [9] Subsequently, the research of SACs has been rapidly developed into a frontier topic in the field of catalysis since the concept of "single-atom catalysis" was first mentioned by Zhang et al. in 2001. [10] Soon afterwards, Zhang and co-workers proposed an Au-alloyed Pd SACs for ullmann organocatalytic reaction. [11] Subsequently, the Rh SACs loaded on ZnO nanowires could be used to industrially catalyze hydroformylation of olefins by Zhang et al. [12] It showed high activity and selectivity for the hydroformylation of propylene by Zeng et al. [13] Besides, the SACs can be used to catalyze other important electrocatalytic reactions, such as hydrogen evolution reaction (HER), oxygen evolution reaction (OER), and carbon dioxide reduction reaction (CO 2 RR). For instance, Yu et al. reported that Pt SAC supported on N-doped mesoporous hollow carbon spheres could exhibit excellent HER activity. [14] Wei and co-workers. dispersed Co-P 4 active sites on g-C 3 N 4 as for photocatalytic water splitting reaction. [15] Moreover, Wang et al. used DFT to study a series of transition metals SACs (Fe, Co, Ni, Cu) supported on N-doped graphene, proving that Co-N 4 SAC performed the most excellent OER activity. [16] Wang et al. synthesized Fe SAC on carbonbase with high-efficiency CO 2 RR catalytic activity. [17] Oxygen reduction reaction (ORR) is the important half-reaction for metal-air batteries and fuel cells (FCs), which plays the decisive role for the performance of whole devices. Developing high-efficiency non-precious metal ORR catalysts is urgent and still challenging. Single-atom catalysts (SACs) are considered to be one of the promising substitutes for Pt due to their maximum atom utilization efficiency and mass activity. Despite considerable efforts in preparing various SACs, the reaction mechanism and intrinsic activity modulat...

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A ΔE = 0.63 V Bifunctional Oxygen Electrocatalyst Enables High‐Rate and Long‐Cycling Zinc–Air Batteries

Cited by 191 publications

References 75 publications

FeCo Nanoparticles Encapsulated in N‐Doped Carbon Nanotubes Coupled with Layered Double (Co, Fe) Hydroxide as an Efficient Bifunctional Catalyst for Rechargeable Zinc–Air Batteries

FeCo Nanoparticles Encapsulated in N‐Doped Carbon Nanotubes Coupled with Layered Double (Co, Fe) Hydroxide as an Efficient Bifunctional Catalyst for Rechargeable Zinc–Air Batteries

Recent Developments of Microenvironment Engineering of Single‐Atom Catalysts for Oxygen Reduction toward Desired Activity and Selectivity

Designed Synthesis and Catalytic Mechanisms of Non‐Precious Metal Single‐Atom Catalysts for Oxygen Reduction Reaction

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