Honeycomb-like Self-Supported Co–N–C Catalysts with an Ultrastable Structure: Highly Efficient Electrocatalysts toward Oxygen Reduction Reaction in Alkaline and Acidic Solutions

Liu, Jiao; Yu, Hua-Zhong; Zhang, Tian‐Heng; Wang, Wentao; Han, Xiao-Feng; Yuan, Yaxian; Yao, Jianlin; Yang, Ruizhi; Tian, Jing‐Hua

doi:10.1021/acsaem.0c03092

Cited by 20 publications

(9 citation statements)

References 58 publications

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“…The poor stability due to the strong Fenton reaction is a standing issue with the Fe–N–C catalyst . In the past few years, the Fe-free M–N–C catalysts such as Co–N–C, Mn–N–C, Cu–N–C, etc., have been explored for oxygen electrocatalysis − (Table ). The PZAB based on single atom Cu–N 4 –C 8 S 2 ORR catalyst derived from copper phthalocyanine, dicyandiamide, and sulfur precursor delivered a maximum power density of 220 mW cm –2 and a specific capacity of 780 mAh g –1 (at 5 mA cm –2 ) .…”

Section: Emerging Non-pt Electrocatalysts For Orr and Pzabmentioning

confidence: 99%

Advanced Oxygen Electrocatalyst for Air-Breathing Electrode in Zn-Air Batteries

Kundu

Mallick

Ghora

et al. 2021

ACS Appl. Mater. Interfaces

123

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The electrochemical reduction of oxygen to water and the evolution of oxygen from water are two important electrode reactions extensively studied for the development of electrochemical energy conversion and storage technologies based on oxygen electrocatalysis. The development of an inexpensive, highly active, and durable nonprecious-metal-based oxygen electrocatalyst is indispensable for emerging energy technologies, including anion exchange membrane fuel cells, metal-air batteries (MABs), water electrolyzers, etc. The activity of an oxygen electrocatalyst largely decides the overall energy storage performance of these devices. Although the catalytic activities of Pt and Ru/Ir-based catalysts toward an oxygen reduction reaction (ORR) and an oxygen evolution reaction (OER) are known, the high cost and lack of durability limit their extensive use for practical applications. This review article highlights the oxygen electrocatalytic activity of the emerging non-Pt and non-Ru/Ir oxygen electrocatalysts including transition-metal-based random alloys, intermetallics, metal-coordinated nitrogen-doped carbon (M–N–C), and transition metal phosphides, nitrides, etc., for the development of an air-breathing electrode for aqueous primary and secondary zinc-air batteries (ZABs). Rational surface and chemical engineering of these electrocatalysts is required to achieve the desired oxygen electrocatalytic activity. The surface engineering increases the number of active sites, whereas the chemical engineering enhances the intrinsic activity of the catalyst. The encapsulation or integration of the active catalyst with undoped or heteroatom-doped carbon nanostructures affords an enhanced durability to the active catalyst. In many cases, the synergistic effect between the heteroatom-doped carbon matrix and the active catalyst plays an important role in controlling the catalytic activity. The ORR activity of these catalysts is evaluated in terms of onset potential, number of electrons transferred, limiting current density, and durability. The bifunctional oxygen electrocatalytic activity and ZAB performance, on the other hand, are measured in terms of potential gap between the ORR and OER, ΔE = E j10 OER – E 1/2 ORR, specific capacity, peak power density, open circuit voltage, voltaic efficiency, and charge–discharge cycling stability. The nonprecious metal electrocatalyst-based ZABs are very promising and they deliver high power density, specific capacity, and round-trip efficiency. The active site for oxygen electrocatalysis and challenges associated with carbon support is briefly addressed. Despite the considerable progress made with the emerging electrocatalysts in recent years, several issues are yet to be addressed to achieve the commercial potential of rechargeable ZAB for practical applications.

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Section: Emerging Non-pt Electrocatalysts For Orr and Pzabmentioning

confidence: 99%

Advanced Oxygen Electrocatalyst for Air-Breathing Electrode in Zn-Air Batteries

Kundu

Mallick

Ghora

et al. 2021

ACS Appl. Mater. Interfaces

123

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“…[ 3–6 ] Compared with emphasized single‐iron‐based electrocatalysts, nitrogen‐coordinated single‐cobalt site catalysts exhibit more promising prospects owing to fewer concerns about the degradation of both the ionomer and the membrane by the Fenton reaction. [ 7,8 ] Atomically dispersed Co‐N‐C catalysts are usually synthesized from cobalt‐based zeolitic imidazolate frameworks through high‐temperature pyrolysis, which presents challenges in maintaining the desired structure and synthetic control. [ 9–11 ] Moreover, the pyrolysis process leads to morphological destruction, causing many effective active sites to be buried due to undesired pore structures, thereby significantly reducing the catalyst activity.…”

Section: Introductionmentioning

confidence: 99%

Porous Covalent Organic Polymer Coordinated Single Co Site Nanofibers for Efficient Oxygen‐Reduction Cathodes in Polymer Electrolyte Fuel Cells

Yang

Han

et al. 2022

Advanced Materials

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Nitrogen‐coordinated single‐cobalt‐atom electrocatalysts, particularly ones derived from high‐temperature pyrolysis of cobalt‐based zeolitic imidazolate frameworks (ZIFs), have emerged as a new frontier in the design of oxygen reduction cathodes in polymer electrolyte fuel cells (PEFCs) due to their enhanced durability and smaller Fenton effects related to the degradation of membranes and ionomers compared with emphasized iron‐based electrocatalysts. However, pyrolysis techniques lead to obscure active‐site configurations, undesirably defined porosity and morphology, and fewer exposed active sites. Herein, a highly stable cross‐linked nanofiber electrode is directly prepared by electrospinning using a liquid processability cobalt‐based covalent organic polymer (Co‐COP) obtained via pyrolysis‐free strategy. The resultant fibers can be facilely organized into a free‐standing large‐area film with a uniform hierarchical porous texture and a full dispersion of atomic Co active sites on the catalyst surface. Focused ion beam‐field emission scanning electron microscopy and computational fluid dynamics experiments confirm that the relative diffusion coefficient is enhanced by 3.5 times, which can provide an efficient route both for reactants to enter the active sites, and drain away the produced water efficiently. Resultingly, the peak power density of the integrated Co‐COP nanofiber electrode is remarkably enhanced by 1.72 times along with significantly higher durability compared with conventional spraying methods. Notably, this nanofabrication technique also maintains excellent scalability and uniformity.

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“…Environmental pollution and foreseeable energy shortages have become a tricky problem, so pollution-free and renewable energy technology is of paramount importance to mankind today [1][2][3]. The oxygen reduction reaction (ORR) is a critical central reaction in fuel cells and metal-air batteries, but fuel cells are always limited for the sluggishness of the ORR at the cathode [4][5][6]. Nowadays, the predominant commercial ORR catalysts are still made of platinum (Pt) and its alloys because of their outstanding properties.…”

Section: Introductionmentioning

confidence: 99%

High-Level Oxygen Reduction Catalysts Derived from the Compounds of High-Specific-Surface-Area Pine Peel Activated Carbon and Phthalocyanine Cobalt

Zhao

Lan

et al. 2021

Nanomaterials

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Non-platinum carbon-based catalysts have attracted much more attention in recent years because of their low cost and outstanding performance, and are regarded as one of the most promising alternatives to precious metal catalysts. Activated carbon (AC), which has a large specific surface area (SSA), can be used as a carrier or carbon source at the same time. In this work, stable pine peel bio-based materials were used to prepare large-surface-area activated carbon and then compound with cobalt phthalocyanine (CoPc) to obtain a high-performance cobalt/nitrogen/carbon (Co-N-C) catalyst. High catalytic activity is related to increasing the number of Co particles on the large-specific-area activated carbon, which are related with the immersing effect of CoPc into the AC and the rational decomposed temperature of the CoPc ring. The synergy with N promoting the exposure of CoNx active sites is also important. The Eonset of the catalyst treated with a composite proportion of AC and CoPc of 1 to 2 at 800 °C (AC@CoPc-800-1-2) is 1.006 V, higher than the Pt/C (20 wt%) catalyst. Apart from this, compared with other AC/CoPc series catalysts and Pt/C (20 wt%) catalyst, the stability of AC/CoPc-800-1-2 is 87.8% in 0.1 M KOH after 20,000 s testing. Considering the performance and price of the catalyst in a practical application, these composite catalysts combining biomass carbon materials with phthalocyanine series could be widely used in the area of catalysts and energy storage.

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Honeycomb-like Self-Supported Co–N–C Catalysts with an Ultrastable Structure: Highly Efficient Electrocatalysts toward Oxygen Reduction Reaction in Alkaline and Acidic Solutions

Cited by 20 publications

References 58 publications

Advanced Oxygen Electrocatalyst for Air-Breathing Electrode in Zn-Air Batteries

Advanced Oxygen Electrocatalyst for Air-Breathing Electrode in Zn-Air Batteries

Porous Covalent Organic Polymer Coordinated Single Co Site Nanofibers for Efficient Oxygen‐Reduction Cathodes in Polymer Electrolyte Fuel Cells

High-Level Oxygen Reduction Catalysts Derived from the Compounds of High-Specific-Surface-Area Pine Peel Activated Carbon and Phthalocyanine Cobalt

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