Co/CoOx nanoparticles inlaid onto nitrogen-doped carbon-graphene as a trifunctional electrocatalyst

Wen, Xudong; Yang, Xiaocui; Li, Min; Bai, Lu; Guan, Jingqi

doi:10.1016/j.electacta.2018.11.129

Cited by 102 publications

(49 citation statements)

References 85 publications

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“…In the past research, the main focus for ORR catalysts lied in metallic nanoparticles (NPs), in which transition metals of Fe, Co, Ni have been widely studied . But the sintering and agglomeration of metals during the electrochemical process lead to degradation of catalyst and reduced stability .…”

Section: Introductionmentioning

confidence: 99%

Optimization of Catalytic Sites in Cobalt‐Modified Nitrogen‐Doped Carbon towards High‐Performance Oxygen Reduction Electrocatalysts for Zinc‐Air Batteries

Xue

Wei

et al. 2019

ChemElectroChem

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Efficient yet low-cost electrocatalysts for the oxygen reduction reaction (ORR) are highly desirable for energy systems such as metal-air batteries and fuel cells. Herein, we report the synthesis of efficient cobalt-modified nitrogen-doped carbon (NÀ C/Co) electrocatalysts by using a one-pot pyrolysis. The abundant source of N in g-C 3 N 4 contributes to the in situ N doping in the carbon matrix, which favors the formation of Co-related catalytic active sites. The NÀ C/Co-1 (prepared with 1 mmol Co salt) sample exhibits the best performance towards the ORR, with a positive half-wave potential of 0.86 V (vs. the reversible hydrogen electrode, RHE), high stability and excellent methanol tolerance, which outperforms the commercial Pt/C catalyst. We find that the high performance is dependent on the optimal content of Co that can achieve the maximum amount of CoÀ N x catalytic species. In addition, we reveal that the size effect of Co nanoparticles is not the determining factor for the ORR activity in the current system, as the kinetics of the ORR reaction is dominantly determined by the active sites derived from CoÀ N x species. By exploiting the NÀ C/Co-1 sample as an air cathode catalyst, the assembled Zn-air battery presents a maximal power density of 153 mW cm À 2 as well as good durability during continuous cycle tests.

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Section: Introductionmentioning

confidence: 99%

Optimization of Catalytic Sites in Cobalt‐Modified Nitrogen‐Doped Carbon towards High‐Performance Oxygen Reduction Electrocatalysts for Zinc‐Air Batteries

Xue

Wei

et al. 2019

ChemElectroChem

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“…The composition and molecular structures of precursors are very critical for structure formation and catalytic properties of the produced catalysts . For example, the aromatic ring and the cyanide group contained precursors are considered to benefit relatively high production of activity sites for ORR; and the use of Fe and Mn are proved to benefit the formation of graphene‐like structure, while the use of Co, Ni and Cu leads to a disordered or nanosheet structure . The ORR activities of the catalysts that produced by using different metals follow an order as Fe > Co > Cu > Mn > Ni .…”

Section: Introductionmentioning

confidence: 99%

“…For example, the aromatic ring and the cyanide group contained precursors are considered to benefit relatively high production of activity sites for ORR; and the use of Fe and Mn are proved to benefit the formation of graphene‐like structure, while the use of Co, Ni and Cu leads to a disordered or nanosheet structure . The ORR activities of the catalysts that produced by using different metals follow an order as Fe > Co > Cu > Mn > Ni . Recently, the polyaniline (PANI) derived catalysts exhibited Pt‐comparable activity towards ORR .…”

Section: Introductionmentioning

confidence: 99%

The Role of Polyaniline Molecular Structure in Producing High‐Performance Fe‐N‐C Catalysts for Oxygen Reduction Reaction

Chen

Jia

et al. 2019

ChemistrySelect

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The precise control of nano‐structure and increase active sites density are of crucial importance for the pyrolyzed Fe‐N−C catalysts′ performance optimization. Herein, the relationship between molecular structures of PANI precursors and the activity for oxygen reduction reaction (ORR) of the derived Fe‐N−C catalysts is investigated. The PANI molecular structure, especially the content of quinoid rings (QR), is controlled by varying molar ratios of ammonium persulfate (APS) to aniline monomers (AN). With the increase of APS/AN ratio from 0.5 to 4, the oxidation degree together with the QR content of PANI increases. Accordingly, the produced catalysts’ morphology experiences an evolution from bulk, nanotube to flower‐like structure. And the ORR activity shows volcano‐relationship with the increase of the QR content in PANI precursors. Specifically, when APS/AN=2.5, the derived PANI with moderate QR content benefits to produce Fe‐N−C catalyst which shows the maximum ORR activity with a half‐wave potential of 0.74 V (vs RHE) in acidic electrolyte among the produced catalysts. Moreover, two opposite effects with the increasing QR content are revealed; i) the QR benefits the Fe coordination and Fe−Nx active sites formation which enhances the activity, and ii) the accompanying formed oligomers decrease the thermal stability and thus decrease the number of active sites.

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“…Therefore, the development of low‐cost and high‐efficiency ORR electrocatalysts with their catalytic efficiencies close to Pt‐based catalysts is thus of great significance. In this endeavor, non‐precious Pt‐free ORR catalysts have been actively explored, such as heteroatom‐doped metal‐free carbon materials, transition metal oxides, metal chalcogenides, metal nanoparticles, metal/metal oxides, and etc. Among these substitutes, transition metal oxides (for example, Fe x O y , Co x O y and Mn x O y ) have been paid more attentions because of their natural advantages of low price, well‐off resources, environmental friendliness and considerable catalytic activity .…”

Section: Introductionmentioning

confidence: 99%

Fe₃O₄ Nanoparticles Supported on Arc‐synthesized Carbon Nanotubes as Advanced Electrocatalyst for Oxygen Reduction Reaction

Zhao

Luo

et al. 2019

ChemistrySelect

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Oxygen reduction reaction (ORR) is an important half reaction in many renewable energy conversion and storage sources. The development of efficient, cost‐effective and durable non‐precious ORR catalysts with their catalytic efficiencies close to expensive Pt‐based catalysts is promising towards large‐scale practical applications of fuel cells and metal‐air batteries. Herein, we report a facile and scalable in‐situ synthesis of Fe3O4 nanoparticles supported on carbon nanotubes hybrid material using arc‐discharge method in low‐pressure air and use Fe3O4/CNTs hybrid as a highly efficient ORR electrocatalyst. The as‐synthesized Fe3O4/CNTs catalyst shows excellent ORR catalytic activity with its performance close to or even better than the commercial 20wt% Pt/C in alkaline media due to the synergistic effect between Fe3O4 and CNTs. This study provides a new insight into non‐precious metal ORR catalysts that are feasible in alkaline membrane fuel cells and metal‐air batteries.

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Co/CoOx nanoparticles inlaid onto nitrogen-doped carbon-graphene as a trifunctional electrocatalyst

Cited by 102 publications

References 85 publications

Optimization of Catalytic Sites in Cobalt‐Modified Nitrogen‐Doped Carbon towards High‐Performance Oxygen Reduction Electrocatalysts for Zinc‐Air Batteries

Optimization of Catalytic Sites in Cobalt‐Modified Nitrogen‐Doped Carbon towards High‐Performance Oxygen Reduction Electrocatalysts for Zinc‐Air Batteries

The Role of Polyaniline Molecular Structure in Producing High‐Performance Fe‐N‐C Catalysts for Oxygen Reduction Reaction

Fe₃O₄ Nanoparticles Supported on Arc‐synthesized Carbon Nanotubes as Advanced Electrocatalyst for Oxygen Reduction Reaction

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Co/CoOx nanoparticles inlaid onto nitrogen-doped carbon-graphene as a trifunctional electrocatalyst

Cited by 102 publications

References 85 publications

Optimization of Catalytic Sites in Cobalt‐Modified Nitrogen‐Doped Carbon towards High‐Performance Oxygen Reduction Electrocatalysts for Zinc‐Air Batteries

Optimization of Catalytic Sites in Cobalt‐Modified Nitrogen‐Doped Carbon towards High‐Performance Oxygen Reduction Electrocatalysts for Zinc‐Air Batteries

The Role of Polyaniline Molecular Structure in Producing High‐Performance Fe‐N‐C Catalysts for Oxygen Reduction Reaction

Fe3O4 Nanoparticles Supported on Arc‐synthesized Carbon Nanotubes as Advanced Electrocatalyst for Oxygen Reduction Reaction

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Product

Resources

About

Fe₃O₄ Nanoparticles Supported on Arc‐synthesized Carbon Nanotubes as Advanced Electrocatalyst for Oxygen Reduction Reaction