Graphene–Ni–α-MnO2 and –Cu–α-MnO2 nanowire blends as highly active non-precious metal catalysts for the oxygen reduction reaction

Lambert, Timothy N.; Davis, Danae J.; Lu, Wei; Limmer, Steven J.; Kotula, Paul G.; Thuli, Alexis; Hungate, Madalyn; Ruan, Gedeng; Jin, Zhong; Tour, James M.

doi:10.1039/c2cc32971a

Cited by 84 publications

(101 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[22] The presented Tafel slopes are also consistent with the carbon-and reduced-graphene-supported high-performance transition metal oxides investigated previously. [55,57,60,98,99] Furthermore, the number of transferred electrons (n) is a key parameter to evaluate the selectivity of the catalysts during the ORR. Therefore, the RDE current-potential curves of The superior electrochemical OER, oxidant-driven and photochemical water oxidation, and ORR performances of spinel microspheres can be attributed to the porous nature of the materials.…”

Section: Resultsmentioning

confidence: 99%

Cobalt–Manganese‐Based Spinels as Multifunctional Materials that Unify Catalytic Water Oxidation and Oxygen Reduction Reactions

et al. 2014

View full text Add to dashboard Cite

Recently, there has been much interest in the design and development of affordable and highly efficient oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) catalysts that can resolve the pivotal issues that concern solar fuels, fuel cells, and rechargeable metal-air batteries. Here we present the synthesis and application of porous CoMn2 O4 and MnCo2 O4 spinel microspheres as highly efficient multifunctional catalysts that unify the electrochemical OER with oxidant-driven and photocatalytic water oxidation as well as the ORR. The porous materials were prepared by the thermal degradation of the respective carbonate precursors at 400 °C. The as-prepared spinels display excellent performances in electrochemical OER for the cubic MnCo2 O4 phase in comparison to the tetragonal CoMn2 O4 material in an alkaline medium. Moreover, the oxidant-driven and photocatalytic water oxidations were performed and they exhibited a similar trend in activity to that of the electrochemical OER. Remarkably, the situation is reversed in ORR catalysis, that is, the oxygen reduction activity and stability of the tetragonal CoMn2 O4 catalyst outperformed that of cubic MnCo2 O4 and rivals that of benchmark Pt catalysts. The superior catalytic performance and the remarkable stability of the unifying materials are attributed to their unique porous and robust microspherical morphology and the intrinsic structural features of the spinels. Moreover, the facile access to these high-performance materials enables a reliable and cost-effective production on a large scale for industrial applications.

show abstract

Section: Resultsmentioning

confidence: 99%

Cobalt–Manganese‐Based Spinels as Multifunctional Materials that Unify Catalytic Water Oxidation and Oxygen Reduction Reactions

et al. 2014

View full text Add to dashboard Cite

show abstract

“…38 The ORR activities of different kinds of transition metal oxides have been thoroughly investigated from their crystallographic structures, morphologies and doping effects. 76 In order to accelerate the development of highly active transition metal oxide catalysts, a design principle has been identied. 64 Meanwhile, doping MnO 2 with Cu or Ni improves the catalytic activity.…”

Section: Minireview Materials Horizonsmentioning

confidence: 99%

Magnesium–air batteries: from principle to application

2014

View full text Add to dashboard Cite

Metal-air batteries are important power sources for electronics and vehicles because of their remarkable high theoretical energy density and low cost. In this paper, we introduce the fundamental principles and applications of Mg-air batteries. Recent progress in Mg or Mg alloys as anode materials and typical classes of air cathode catalysts for Mg-air batteries are reviewed. In the meantime, different compositions of the electrolyte are also compared. The design of electrode materials both for anodes and cathodes of Mg-air batteries is discussed for further performance improvement. It is noted that in the development of rechargeable Mg-air batteries, bi-functional catalysts with reversible oxygen reduction and evolution reactions are facing challenges and it is worthwhile devoting much effort to this.

show abstract

“…[17][18][19] Inorganic materials doped with metal ions (such as Ni 2 + , Cu 2 + ,Z n 2 + ,M n 4 + )h ave gainedm uch interest in recent years, which can favorably alter the properties of the materials by increasingt he overall electron density as wella sc hangingt he electricalc onductivities. [20][21][22] Herein, we report af acile approach to prepare sodium (Na)-doped porous Ni 2 P 2 O 7 hexagonal tablets,i nw hich the hexagonal tablet precursor was prepared by as imple hydrothermalm ethod. The Na-doped porousN i 2 P 2 O 7 hexagonal tablets were obtained by thermally decomposing the precursor.E lectrochemical measurements showedt hat an electrode made from Na-doped porous Ni 2 P 2 O 7 hexagonal tablets exhibits as pecific capacitance of 557.7 Fg À1 at acurrent density of 1.2 Ag À1 .Furthermore, aflexible solid-state hybrid supercapacitor was successfully con-structed by using the Na-doped porous Ni 2 P 2 O 7 hexagonal tablets as the positivee lectrode and graphene as then egative electrode.…”

Section: Introductionmentioning

confidence: 99%

Sodium‐Doped Mesoporous Ni₂P₂O₇ Hexagonal Tablets for High‐Performance Flexible All‐Solid‐State Hybrid Supercapacitors

Wei

Cheng

Wang

et al. 2015

Chemistry An Asian Journal

View full text Add to dashboard Cite

As imple hydrothermalm ethod has been developed to prepareh exagonal tablet precursors, whicha re then transformed into porous sodium-doped Ni 2 P 2 O 7 hexagonal tablets by as imple calcination method. Theo btained samples were evaluated as electrode materials for supercapacitors. Electrochemical measurements showt hat the electrode based on the poroussodium-doped Ni 2 P 2 O 7 hexagonal tablets exhibits as pecific capacitance of 557.7 Fg À1 at ac urrent density of 1.2 Ag À1.F urthermore, the porous sodiumdopedN i 2 P 2 O 7 hexagonal tablets were successfully used to construct flexible solid-stateh ybrid supercapacitors. The devicei sh ighly flexible and achieves am aximum energy density of 23.4 Wh kg À1 and ag ood cycling stability after 5000 cycles, which confirms that the porouss odium-doped Ni 2 P 2 O 7 hexagonal tablets are promising activem aterials for flexible supercapacitors.

show abstract

Graphene–Ni–α-MnO2 and –Cu–α-MnO2 nanowire blends as highly active non-precious metal catalysts for the oxygen reduction reaction

Abstract: Graphene-like carbon-Ni-α-MnO(2) and -Cu-α-MnO(2) blends can serve as effective catalysts for the oxygen reduction reaction with activities comparable to Pt/C.

Cited by 84 publications

References 24 publications

Cobalt–Manganese‐Based Spinels as Multifunctional Materials that Unify Catalytic Water Oxidation and Oxygen Reduction Reactions

Cobalt–Manganese‐Based Spinels as Multifunctional Materials that Unify Catalytic Water Oxidation and Oxygen Reduction Reactions

Magnesium–air batteries: from principle to application

Sodium‐Doped Mesoporous Ni₂P₂O₇ Hexagonal Tablets for High‐Performance Flexible All‐Solid‐State Hybrid Supercapacitors

Contact Info

Product

Resources

About

Graphene–Ni–α-MnO2 and –Cu–α-MnO2 nanowire blends as highly active non-precious metal catalysts for the oxygen reduction reaction

Abstract: Graphene-like carbon-Ni-α-MnO(2) and -Cu-α-MnO(2) blends can serve as effective catalysts for the oxygen reduction reaction with activities comparable to Pt/C.

Cited by 84 publications

References 24 publications

Cobalt–Manganese‐Based Spinels as Multifunctional Materials that Unify Catalytic Water Oxidation and Oxygen Reduction Reactions

Cobalt–Manganese‐Based Spinels as Multifunctional Materials that Unify Catalytic Water Oxidation and Oxygen Reduction Reactions

Magnesium–air batteries: from principle to application

Sodium‐Doped Mesoporous Ni2P2O7 Hexagonal Tablets for High‐Performance Flexible All‐Solid‐State Hybrid Supercapacitors

Contact Info

Product

Resources

About

Sodium‐Doped Mesoporous Ni₂P₂O₇ Hexagonal Tablets for High‐Performance Flexible All‐Solid‐State Hybrid Supercapacitors