Flexible carbon nanofiber film with diatomic Fe-Co sites for efficient oxygen reduction and evolution reactions in wearable zinc-air batteries

Wang, Yiyan; Li, Zongge; Zhang, Peng; Pan, Yuan; Zhang, Ying; Cai, Qiong; Silva, S. Ravi P.; Liu, Jian; Zhang, Guoxin; Sun, Xiaoming; Zhang, Yan

doi:10.1016/j.nanoen.2021.106147

Cited by 119 publications

(50 citation statements)

References 77 publications

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“…Besides, 1D Fe 1 Co 1 -CNF, which features excellent flexibility and mechanical strength, can be assembled into stand-alone membrane electrodes for portable ZAB with shape deformability (Figure 13e). [39] Besides, the curved basal plane of CNTs induces geometric deformation of single-atom active sites, thus, providing an excellent substrate to explore the effect of geometric deformation induced by surface strain catalytic activity of carbon-supported SACs. Han et al explored the ORR activities of CuN 2 C 2 sites on various substrates of graphene (G), CNT with a diameter of 8 nm (CNT-8), and CNT with a diameter of 4 nm (CNT-4) (Figure 13f).…”

Section: D Carbon-supported Sacs For Orrmentioning

confidence: 99%

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Macro/Micro‐Environment Regulating Carbon‐Supported Single‐Atom Catalysts for Hydrogen/Oxygen Conversion Reactions

Huo

Shen

Cao

et al. 2022

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Electrochemical storage and conversion systems, such as water electrolyzers, proton exchange membrane (PEM) fuel cells and metal-air batteries, have drawn extensive attention in the last decades. Hydrogen and oxygen conversion reactions, including hydrogen evolution reaction (HER), hydrogen oxidation reaction (HOR), oxygen evolution reaction (OER), and oxygen reduction reaction (ORR), are important reactions in the above-mentioned systems. Specifically, water electrolyzer with HER and OER at cathode and anode, respectively, can transform electricity into clean energy (H 2 ); [4] the fuel cells can convert chemical energy into electricity with HOR at anode and ORR at the cathode; [5] the electrochemical ORR/OER is the pair of inverse reactions during the discharge/charge processes in rechargeable metal-air batteries. [6] Currently, precious metal-based electrocatalysts are still required to drive these electrochemical reactions for high performance. However, the high price and low distribution of precious metals block further commercial applications. [7] Therefore, the exploration of precious metals with low loading and/or nonprecious metal-based catalysts without the compromise of their catalytic activity has been the core of developing renewable energy.In recent years, nanosized catalysts, that is, nanoparticles, quantum dots, and clusters, have been developed rapidly for various electrochemical conversion reactions, such as HER, Single-atom catalysts (SACs) have attracted tremendous research interest due to their unique atomic structure, maximized atom utilization, and remarkable catalytic performance. Among the SACs, the carbon-supported SACs have been widely investigated due to their easily controlled properties of the carbon substrates, such as the tunable morphologies, ordered porosity, and abundant anchoring sites. The electrochemical performance of carbonsupported SACs is highly related to the morphological structure of carbon substrates (macro-environment) and the local coordination environments of center metals (micro-environment). This review aims to provide a comprehensive summary on the macro/micro-environment regulating carbonsupported SACs for highly efficient hydrogen/oxygen conversion reactions. The authors first summarize the macro-environment engineering strategies of carbon-supported SACs with altered specific surface areas and porous properties of the carbon substrates, facilitating the mass diffusion kinetics and structural stability. Then the micro-environment engineering strategies of carbon-supported SACs are discussed with the regulated atomic structure and electronic structure of metal centers, boosting the catalytic performance. Insights into the correlation between the co-boosted effect from the macro/ micro-environments and catalytic activity for hydrogen/oxygen conversion reactions are summarized and discussed. Finally, the challenges and perspectives are addressed in building highly efficient carbon-supported SACs for practical applications.

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Section: D Carbon-supported Sacs For Orrmentioning

confidence: 99%

mentioning

confidence: 99%

Macro/Micro‐Environment Regulating Carbon‐Supported Single‐Atom Catalysts for Hydrogen/Oxygen Conversion Reactions

Huo

Shen

Cao

et al. 2022

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“…2.5 Å) observed when other 3d transition metals (e.g., M = Mn, Co, and Ni) are paired with Fe where direct MÀ Fe metal-metal bonds are generally formed. [1,37,40,42,43] This suggests minimal contributions of metal-metal charge transfer (MMCT) and orbital hybridization to the electrocatalytic activity by the FeÀ Cu dual-metal structures, as such effects decay exponentially with distance. [41] It is within this context that the Cu 1 /Fe 1 structures were selected to examine the correlation between the magnet moment and electrocatalytic activity of the Fe centers.…”

Section: Theoretical Computationmentioning

confidence: 99%

Theory‐Guided Regulation of FeN₄Spin State by Neighboring Cu Atoms for Enhanced Oxygen Reduction Electrocatalysis in Flexible Metal–Air Batteries

Chen

Liu

et al. 2022

Angewandte Chemie

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Iron, nitrogen‐codoped carbon (Fe−N−C) nanocomposites have emerged as viable electrocatalysts for the oxygen reduction reaction (ORR) due to the formation of FeNxCy coordination moieties. In this study, results from first‐principles calculations show a nearly linear correlation of the energy barriers of key reaction steps with the Fe magnetic moment. Experimentally, when single Cu sites are incorporated into Fe−N−C aerogels (denoted as NCAG/Fe−Cu), the Fe centers exhibit a reduced magnetic moment and markedly enhanced ORR activity within a wide pH range of 0–14. With the NCAG/Fe−Cu nanocomposites used as the cathode catalyst in a neutral/quasi‐solid aluminum–air and alkaline/quasi‐solid zinc–air battery, both achieve a remarkable performance with an ultrahigh open‐circuit voltage of 2.00 and 1.51 V, large power density of 130 and 186 mW cm−2, and good mechanical flexibility, all markedly better than those with commercial Pt/C or Pt/C‐RuO2 catalysts at the cathode.

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“…[4][5][6] In such catalysts, the metal atom utilization is nearly 100%, which is very favorable for cost-sensitive catalysts that are used for industrial energy conversion and other applications. [7][8][9] Since the pioneering discovery of SACs by Zhang et al in 2011, strategies for fabricating SACs have rapidly developed. 10 In recent years, the rational design and preparation of SACs have been widely studied, and some novel strategies and inspiring results have been reported.…”

Section: Introductionmentioning

confidence: 99%

Facile fabrication of single-atom catalysts by a plasma-etching strategy for oxygen reduction reaction

Rao

Qin

et al. 2022

J. Mater. Chem. A

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Flexible carbon nanofiber film with diatomic Fe-Co sites for efficient oxygen reduction and evolution reactions in wearable zinc-air batteries

Cited by 119 publications

References 77 publications

Macro/Micro‐Environment Regulating Carbon‐Supported Single‐Atom Catalysts for Hydrogen/Oxygen Conversion Reactions

Macro/Micro‐Environment Regulating Carbon‐Supported Single‐Atom Catalysts for Hydrogen/Oxygen Conversion Reactions

Theory‐Guided Regulation of FeN₄Spin State by Neighboring Cu Atoms for Enhanced Oxygen Reduction Electrocatalysis in Flexible Metal–Air Batteries

Facile fabrication of single-atom catalysts by a plasma-etching strategy for oxygen reduction reaction

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Flexible carbon nanofiber film with diatomic Fe-Co sites for efficient oxygen reduction and evolution reactions in wearable zinc-air batteries

Cited by 119 publications

References 77 publications

Macro/Micro‐Environment Regulating Carbon‐Supported Single‐Atom Catalysts for Hydrogen/Oxygen Conversion Reactions

Macro/Micro‐Environment Regulating Carbon‐Supported Single‐Atom Catalysts for Hydrogen/Oxygen Conversion Reactions

Theory‐Guided Regulation of FeN4Spin State by Neighboring Cu Atoms for Enhanced Oxygen Reduction Electrocatalysis in Flexible Metal–Air Batteries

Facile fabrication of single-atom catalysts by a plasma-etching strategy for oxygen reduction reaction

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Theory‐Guided Regulation of FeN₄Spin State by Neighboring Cu Atoms for Enhanced Oxygen Reduction Electrocatalysis in Flexible Metal–Air Batteries