Defective‐Activated‐Carbon‐Supported Mn–Co Nanoparticles as a Highly Efficient Electrocatalyst for Oxygen Reduction

Yan, Xuecheng; Jia, Yi; Chen, Jie; Zhu, Zhonghua; Yao, Xiangdong

doi:10.1002/adma.201601651

Cited by 178 publications

(104 citation statements)

References 59 publications

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“…[17][18][19] The ORR performance of the resulting nonprecious metal catalysts shows remarkable improvement, for instance, some of them are comparable or even outperformed the commercial Pt/C in alkaline conditions. [20][21][22] However, the identification of the active sties in these carbon coupled Fe/Co catalysts remains a complicated issue. Particularly, extensive research has been focused on revealing the ORR active sites in carbon encapsulated Fe/Co composites.…”

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Probing the Active Sites of Carbon‐Encapsulated Cobalt Nanoparticles for Oxygen Reduction

et al. 2019

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Great effort has been contributed to exploring efficient and cost‐effective oxygen reduction reaction (ORR) catalysts for fuel cell applications in the past decades. Now various electrocatalysts can be synthesized for high‐performance ORR catalysis. However, the identification of the ORR active sites in many nonprecious metal‐based catalysts is still difficult. This is due to the heterogeneity and complexity of the catalyst structures. For example, the active site of core–shell ORR electrocatalysts has been a continuously debatable issue, hampering the exploration of new ORR catalysts. Herein, a carbonized Co metal organic framework (Co@C) is used to uncover the ORR active sites in core–shell electrocatalysts. The surface Co particles in the Co@C sample are removed by HCl wash, and the Co cores are removed using an electrochemical activation method. The characterizations reveal that both the samples before and after the electrochemical activation show the existence of single Co species. The corresponding electrocatalysis test results indicate that neither the surface Co particles nor the encapsulated Co cores influence the ORR performance of the samples. It is deduced that the single Co species coordinated with the nitrogen in the carbon layers of the core–shell catalysts are the actual ORR active sites.

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Probing the Active Sites of Carbon‐Encapsulated Cobalt Nanoparticles for Oxygen Reduction

et al. 2019

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“…However, their intrinsically inferior electrical conductivity during electrocatalysis process exerts remarkably negative impacts on their electrochemical performances. To address these issues, one of the effective strategies is to hybridize the AB 2 O 4 nanocatalysts with conductive carbon‐based substrates (i.e., activated carbon, carbon nanotubes/nanofibers, and graphene) in order to improve their conductivity and electrochemical stability, as well as facilitate charge transfer of the integrated system, thus giving rise to an enhanced OER performance 18, 19, 20, 21, 22, 23, 24. Moreover, heteroatom‐doping, such as N‐doping, into nanocarbon could effectively improve the electronic conductivity and modulate the electronic structures of the carbon matrix, which is beneficial to boost the OER activity 25, 26.…”

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Anchoring CoFe₂O₄ Nanoparticles on N‐Doped Carbon Nanofibers for High‐Performance Oxygen Evolution Reaction

et al. 2017

Advanced Science

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The exploration of earth‐abundant and high‐efficiency electrocatalysts for the oxygen evolution reaction (OER) is of great significant for sustainable energy conversion and storage applications. Although spinel‐type binary transition metal oxides (AB2O4, A, B = metal) represent a class of promising candidates for water oxidation catalysis, their intrinsically inferior electrical conductivity exert remarkably negative impacts on their electrochemical performances. Herein, we demonstrates a feasible electrospinning approach to concurrently synthesize CoFe2O4 nanoparticles homogeneously embedded in 1D N‐doped carbon nanofibers (denoted as CoFe2O4@N‐CNFs). By integrating the catalytically active CoFe2O4 nanoparticles with the N‐doped carbon nanofibers, the as‐synthesized CoFe2O4@N‐CNF nanohybrid manifests superior OER performance with a low overpotential, a large current density, a small Tafel slope, and long‐term durability in alkaline solution, outperforming the single component counterparts (pure CoFe2O4 and N‐doped carbon nanofibers) and the commercial RuO2 catalyst. Impressively, the overpotential of CoFe2O4@N‐CNFs at the current density of 30.0 mA cm−2 negatively shifts 186 mV as compared with the commercial RuO2 catalyst and the current density of the CoFe2O4@N‐CNFs at 1.8 V is almost 3.4 times of that on RuO2 benchmark. The present work would open a new avenue for the exploration of cost‐effective and efficient OER electrocatalysts to substitute noble metals for various renewable energy conversion/storage applications.

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“…According to the discussion above, the best HPW@C dosage is 2.38 × 10 −3 g/g. The reason can be given as follows: HPW@C may combine with Co and Mn in the catalytic system at high temperatures . The unstable AC‐O‐Metal bond may be formed due to the combination of Co and Mn ions with the active sites containing oxygen.…”

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NMSBA produced from NMST under the catalysis of supported H₃PW₁₂O₄₀ and Co/Mn/Br catalytic system

Fang

Zhang

et al. 2017

Can J Chem Eng

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The commercial production of 2‐nitro‐4‐methylsulphonylbenzoic acid (NMSBA) is oxidizing 2‐nitro‐4‐methylsulphonyltoluene (NMST) by nitric acid catalyzed with V2O5. A heterogeneous catalytic system composed of phosphotungstic acid supported on activated carbon, Co, Mn, and Br is used to catalyze the production of NMSBA from NMST by oxygen in this paper. The experiments show that the heterogeneous catalytic system composed of HPW@C, Co, Mn, and Br is capable of speeding up the oxidation of NMST to NMSBA by oxygen and acquiring a higher NMST oxidation rate and NMSBA yield than the homogeneous H3PW12O40/Co/Mn/Br catalytic system. The best HPW@C catalyst is obtained by supporting 0.0125 g/g H3PW12O40 on carbon followed by being calcined at 220 °C for 4 h under nitrogen atmosphere. The best heterogeneous catalytic system consists of 2.38 × 10−3 g/g HPW@C, 925 ppm Br, 236 ppm cobalt, and a Mn/Co molar ratio of 2.5. The usage of phosphotungstic acid in the heterogeneous system is diminished substantially.

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Defective‐Activated‐Carbon‐Supported Mn–Co Nanoparticles as a Highly Efficient Electrocatalyst for Oxygen Reduction

Cited by 178 publications

References 59 publications

Probing the Active Sites of Carbon‐Encapsulated Cobalt Nanoparticles for Oxygen Reduction

Probing the Active Sites of Carbon‐Encapsulated Cobalt Nanoparticles for Oxygen Reduction

Anchoring CoFe₂O₄ Nanoparticles on N‐Doped Carbon Nanofibers for High‐Performance Oxygen Evolution Reaction

NMSBA produced from NMST under the catalysis of supported H₃PW₁₂O₄₀ and Co/Mn/Br catalytic system

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Defective‐Activated‐Carbon‐Supported Mn–Co Nanoparticles as a Highly Efficient Electrocatalyst for Oxygen Reduction

Cited by 178 publications

References 59 publications

Probing the Active Sites of Carbon‐Encapsulated Cobalt Nanoparticles for Oxygen Reduction

Probing the Active Sites of Carbon‐Encapsulated Cobalt Nanoparticles for Oxygen Reduction

Anchoring CoFe2O4 Nanoparticles on N‐Doped Carbon Nanofibers for High‐Performance Oxygen Evolution Reaction

NMSBA produced from NMST under the catalysis of supported H3PW12O40 and Co/Mn/Br catalytic system

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Product

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About

Anchoring CoFe₂O₄ Nanoparticles on N‐Doped Carbon Nanofibers for High‐Performance Oxygen Evolution Reaction

NMSBA produced from NMST under the catalysis of supported H₃PW₁₂O₄₀ and Co/Mn/Br catalytic system