Coordination-controlled single-atom tungsten as a non-3d-metal oxygen reduction reaction electrocatalyst with ultrahigh mass activity

Chen, Huajun; Gong, Wenbin; Liu, Zhibo; Cong, Shan; Zheng, Zhen; Wang, Zhen; Zhang, Wei; Ma, Jingyuan; Yu, Haisheng; Li, Guihang; Lu, Weibang; Ren, Wencai; Zhao, Zhigang

doi:10.1016/j.nanoen.2019.03.045

Cited by 132 publications

(92 citation statements)

References 43 publications

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“…As aconsequence of their good chemical stability as well as high activity,W -based electrocatalysts have attracted much focus. [187][188][189][190][191][192] We [193] synthesized the first W 1 N 1 C 3 active centers for the HER. By using al igand-assisted method, the uncoordinated amino group in the UiO-66-NH 2 skeleton [194] ensured the dispersion of individual Watoms.T he doped W atoms (loading of 1.21 wt %) increased the electron density of coordinated Catoms,which was beneficial for stabilizing the Hspecies,hence effectively boosting the HER activity in 1.0 m KOH.…”

Section: Nonprecious Metalsmentioning

confidence: 99%

Designing Atomic Active Centers for Hydrogen Evolution Electrocatalysts

et al. 2020

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The evolution of hydrogen from water using renewable electrical energy is a topic of current interest. Pt/C exhibits the highest catalytic activity for the H2 evolution reaction (HER), but scarce supplies and high cost limit its large‐scale application. Atomic active centers in single‐atom catalysts, single‐atom alloys, and catalysts with two atom sorts exhibit maximum atomic efficiency, unique structure, and exceptional activity for the HER. Interactions between well‐defined active sites and supports are known to affect electron transfer and dramatically accelerate the reaction. This Review first highlights methods for studying atomic active centers for the HER. Then, active sites with different coordination configurations are described. Active centers with one metal atom, two different metal atoms as well as nonmetal atoms are analyzed at the atomic scale. Finally, future research perspectives are proposed.

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Section: Nonprecious Metalsmentioning

confidence: 99%

Designing Atomic Active Centers for Hydrogen Evolution Electrocatalysts

et al. 2020

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“…), are emerging as a promising candidate for the ORR [18][19][20][21][22]. The tailored electronic structure and coordination environments of SACs bring new possibilities for improving ORR performance and fundamental understanding of active centers due to their structural simplicity [23][24][25]. An annealing process has been demonstrated for the effective formation of active metal centers, which however causes the difficulty in controlling the microstructure/porosity and coordination environment of the SACs [26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Secondary-Atom-Doping Enables Robust Fe–N–C Single-Atom Catalysts with Enhanced Oxygen Reduction Reaction

et al. 2020

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• Secondary-atom-doped strategy was proposed to synthesize single-atom electrocatalyst. • The increase in both the density of active sites and their intrinsic activity was achieved simultaneously. • The resultant single-atom catalyst shows outstanding ORR activity in acidic media. ABSTRACT Single-atom catalysts (SACs) with nitrogen-coordinated nonprecious metal sites have exhibited inimitable advantages in electrocatalysis. However, a large room for improving their activity and durability remains. Herein, we construct atomically dispersed Fe sites in N-doped carbon supports by secondary-atom-doped strategy. Upon the secondary doping, the density and coordination environment of active sites can be efficiently tuned, enabling the simultaneous improvement in the number and reactivity of the active site. Besides, structure optimizations in terms of the enlarged surface area and improved hydrophilicity can be achieved simultaneously. Due to the beneficial microstructure and abundant highly active FeN 5 moieties resulting from the secondary doping, the resultant catalyst exhibits an admirable half-wave potential of 0.81 V versus 0.83 V for Pt/C and much better stability than Pt/C in acidic media. This work would offer a general strategy for the design and preparation of highly active SACs for electrochemical energy devices.

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“…Fuel cell, one of devices that directly converts chemical energy into electric energy, has been regarded as a promising technology to provide clean and sustainable energy for future. [ 131 ] However, this promising technology suffers from two great bottlenecks of low energy conversion efficiency and poor stability, which significantly prevent it from practical application (commercialization). [ 132 ] These bottlenecks mainly originate from the essentially poor kinetics of ORR and the low durability in acidic or alkaline electrolyte.…”

Section: Gdy Supported Electrocatalysts For Energy Conversionmentioning

confidence: 99%

Graphdiyne: A Rising Star of Electrocatalyst Support for Energy Conversion

Lai

Zhang

et al. 2020

Advanced Energy Materials

110

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Graphdiyne (GDY), a rising star of 2D carbon allotropes with one‐atom‐thick planar layers, has achieved the coexistence of sp‐ and sp2‐hybridized carbon atoms in a 2D planar structure. In contrast to the prevailing carbon allotropes, GDY possesses Dirac cone structures, which endow it with unique chemical and physical properties, including an adjustable inherent bandgap, high‐speed charge carrier transfer efficiency, and excellent conductivity. Additionally, GDY also displays great potential in photocatalysis, rechargeable batteries, solar cells, detectors, and especially electrocatalysis. In this work, various GDY‐supported electrocatalysts are described and the reasons why GDY can act as a novel support are analyzed from the perspective of molecular structure, electronic properties, mechanical properties, and stability. The various electrochemical applications of GDY‐supported electrocatalysts in energy conversion such as hydrogen evolution reaction, oxygen evolution reaction, oxygen reduction reaction, overall water splitting, and nitrogen reduction reaction are reviewed. The challenges facing GDY and GDY‐based materials in future research are also outlined. This review aims at providing an in‐depth understanding of GDY and promoting the development and application of this novel carbon material.

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Coordination-controlled single-atom tungsten as a non-3d-metal oxygen reduction reaction electrocatalyst with ultrahigh mass activity

Cited by 132 publications

References 43 publications

Designing Atomic Active Centers for Hydrogen Evolution Electrocatalysts

Designing Atomic Active Centers for Hydrogen Evolution Electrocatalysts

Secondary-Atom-Doping Enables Robust Fe–N–C Single-Atom Catalysts with Enhanced Oxygen Reduction Reaction

Graphdiyne: A Rising Star of Electrocatalyst Support for Energy Conversion

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