Atomically dispersed hierarchically ordered porous Fe–N–C electrocatalyst for high performance electrocatalytic oxygen reduction in Zn-Air battery

Zhang, Xibo; Han, Xiao; Jiang, Zhe; Xu, Jie; Chen, Luning; Xue, Yakun; Nie, Anmin; Xie, Zhaoxiong; Kuang, Qin; Zheng, Lan‐Sun

doi:10.1016/j.nanoen.2020.104547

Cited by 232 publications

(134 citation statements)

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“…Since the pioneering work reported by Liang and coworkers that silica nanoparticles could be used as the template to prepare single-atom Co-N-C catalysts by adsorption and pyrolysis of Vitamin B 12 [ 174 ], various hard templates such as self-assembled polystyrene sphere (PS) [ 150 , 175 ], silica colloidal crystal [ 153 , 176 – 178 ], silica particles with a hollow core and a mesoporous shell [ 114 ], self-assembled Fe 3 O 4 nanocubes [ 179 ], and ordered mesoporous silica [ 145 ] have been used to construct SAECs with atomically dispersed active sites embedded in the carbon framework with hierarchical pores from micropores to mesopores and macropores to increase the accessible active-site numbers and enhance the mass and electron transports. Lee and coworkers further systematically investigated the influence of a porous carbon structure on the ORR activity by preparing three types of N-doped carbon catalysts with different pore size distributions but similar Brunauer-Emmett-Teller (BET) surface area and active-site concentration [ 173 ].…”

Section: Saecs For Oxygen Reduction Reactionsmentioning

confidence: 99%

Recent Advances in Single-Atom Electrocatalysts for Oxygen Reduction Reaction

2020

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Oxygen reduction reaction (ORR) plays significant roles in electrochemical energy storage and conversion systems as well as clean synthesis of fine chemicals. However, the ORR process shows sluggish kinetics and requires platinum-group noble metal catalysts to accelerate the reaction. The high cost, rare reservation, and unsatisfied durability significantly impede large-scale commercialization of platinum-based catalysts. Single-atom electrocatalysts (SAECs) featuring with well-defined structure, high intrinsic activity, and maximum atom efficiency have emerged as a novel field in electrocatalytic science since it is promising to substitute expensive platinum-group noble metal catalysts. However, finely fabricating SAECs with uniform and highly dense active sites, fully maximizing the utilization efficiency of active sites, and maintaining the atomically isolated sites as single-atom centers under harsh electrocatalytic conditions remain urgent challenges. In this review, we summarized recent advances of SAECs in synthesis, characterization, oxygen reduction reaction (ORR) performance, and applications in ORR-related H2O2 production, metal-air batteries, and low-temperature fuel cells. Relevant progress on tailoring the coordination structure of isolated metal centers by doping other metals or ligands, enriching the concentration of single-atom sites by increasing metal loadings, and engineering the porosity and electronic structure of the support by optimizing the mass and electron transport are also reviewed. Moreover, general strategies to synthesize SAECs with high metal loadings on practical scale are highlighted, the deep learning algorithm for rational design of SAECs is introduced, and theoretical understanding of active-site structures of SAECs is discussed as well. Perspectives on future directions and remaining challenges of SAECs are presented.

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Section: Saecs For Oxygen Reduction Reactionsmentioning

confidence: 99%

Recent Advances in Single-Atom Electrocatalysts for Oxygen Reduction Reaction

2020

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“…ZIF‐8 is a good precursor to prepare SACs owing to its N‐containing ligands, regular morphology and readily preparation at ambient temperatures [64–71] . Using Fe‐doped ZIF‐8 as precursors, Wu and co‐workers prepared atomically dispersed Fe in N‐doped carbons for ORR.…”

Section: Single‐atom Electrocatalysts Derived From Mofsmentioning

confidence: 99%

Section: Single‐atom Electrocatalysts Derived From Mofsmentioning

confidence: 99%

Single‐Atom and Dual‐Atom Electrocatalysts Derived from Metal Organic Frameworks: Current Progress and Perspectives

et al. 2020

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Single-atom catalysts (SACs) have attracted increasing research interests owing to their unique electronic structures, quantum size effects and maximum utilization rate of atoms. Metal organic frameworks (MOFs) are good candidates to prepare SACs owing to the atomically dispersed metal nodes in MOFs and abundant N and C species to stabilize the single atoms. In addition, the distance of adjacent metal atoms can be turned by adjusting the size of ligands and adding volatile metal centers to promote the formation of isolated metal atoms. Moreover, the diverse metal centers in MOFs can promote the preparation of dual-atom catalysts (DACs) to improve the metal loading and optimize the electronic structures of the catalysts. The applications of MOFs derived SACs and DACs for electrocatalysis, including oxygen reduction reaction, oxygen evolution reaction, hydrogen evolution reaction, carbon dioxide reduction reaction and nitrogen reduction reaction are systematically summarized in this Review. The corresponding synthesis strategies, atomic structures and electrocatalytic performances of the catalysts are discussed to provide a deep understanding of MOFs-based atomic electrocatalysts. The catalytic mechanisms of the catalysts are presented, and the crucial challenges and perspectives are proposed to promote further design and applications of atomic electrocatalysts.

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“…Atomically dispersed metal catalysts (ADMCs) have recently emerged as a new frontier in catalysis science and have attracted extensive research attention. [85][86][87][88] Traditional heterogeneous catalysts with a broad size distribution of metal particles suffer from a low metal utilization efficiency and poor selectivity. Homogeneous catalysts with well-defined active sites and tunable coordination environments exhibit excellent activity and exclusive selectivity for a specific reaction.…”

Section: Atomically Dispersed Metal Sites Controlmentioning

confidence: 99%

Defect Electrocatalysts and Alkaline Electrolyte Membranes in Solid‐State Zinc–Air Batteries: Recent Advances, Challenges, and Future Perspectives

Zhang

et al. 2020

Small Methods

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Rechargeable zinc–air batteries (ZABs) have attracted much attention due to their promising capability for offering high energy density while maintaining a long operational lifetime. One of the biggest challenges in developing all‐solid‐state ZABs is to design suitable bifunctional air‐electrodes, which can efficiently catalyze the key oxygen reduction reaction (ORR)/oxygen evolution reaction (OER) electrochemical processes. The other one is to develop robust electrolyte membranes with high ionic conductivity and superb water retention capability. In this review, an in‐depth discussion of the challenges, mechanisms, and design strategies for the defect electrocatalyst and the electrolyte membrane in all‐solid‐state ZABs will be offered. In particular, the crucial defect engineering strategies to tune the ORR/OER catalysts are summarized, including direct controllable strategies: 1) atomically dispersed metal sites control, 2) vacancy defects control, and 3) lattice‐strain control, and the indirect strategies: 4) crystallographic structure control and 5) metal–carbon support interaction control. Moreover, the most recent progress in designing electrolyte membranes, including polyvinyl alcohol‐based membranes and gel polymer electrolyte membranes, is presented. Finally, the perspectives are proposed for rational design and fabrication of the desired air electrode and electrolyte membrane to improve the performance and prolong the lifetime of all‐solid‐state ZABs.

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Atomically dispersed hierarchically ordered porous Fe–N–C electrocatalyst for high performance electrocatalytic oxygen reduction in Zn-Air battery

Cited by 232 publications

References 50 publications

Recent Advances in Single-Atom Electrocatalysts for Oxygen Reduction Reaction

Recent Advances in Single-Atom Electrocatalysts for Oxygen Reduction Reaction

Single‐Atom and Dual‐Atom Electrocatalysts Derived from Metal Organic Frameworks: Current Progress and Perspectives

Defect Electrocatalysts and Alkaline Electrolyte Membranes in Solid‐State Zinc–Air Batteries: Recent Advances, Challenges, and Future Perspectives

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