The synergistic effect of Ceria and Co in N-doped leaf-like carbon nanosheets derived from a 2D MOF and their enhanced performance in the oxygen reduction reaction

Xia, Wei; Li, Jingjing; Wang, Tao; Song, Li; Guo, Hu; Gong, Hao; Jiang, Cheng; Gao, Bin; He, Jie

doi:10.1039/c7cc09212a

Cited by 102 publications

(64 citation statements)

References 28 publications

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“…As demonstrated by Shao and co‐workers,39 the ORR activity of Co 3 O 4 /ketjenblack could be significantly improved by doping with CeO 2 REO. The rich oxygen vacancies of CeO 2 and swift transition between Ce 3+ and Ce 4+ would be conducive to facilitate O 2 adsorption 40. Tang and co‐workers also reported that CeO 2 provided a synergistic effect to improve the ORR performance of MnO x 41.…”

Section: Introductionmentioning

confidence: 99%

“…In view of the electronic interaction effect, modification of transition metal‐based catalysts with foreign promoters should be a reliable strategy to regulate their electrocatalytic performance 33–37. Recently, rare earth oxides (REO) have attracted special interest as the foreign promoters to modulate the electrocatalytic properties of various transition metals33,38–42 owing to their unique electronic and chemical properties of 4f subshell electrons 43,44. As demonstrated by Shao and co‐workers,39 the ORR activity of Co 3 O 4 /ketjenblack could be significantly improved by doping with CeO 2 REO.…”

Section: Introductionmentioning

confidence: 99%

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Gadolinium‐Induced Valence Structure Engineering for Enhanced Oxygen Electrocatalysis

Wang

Yang

et al. 2020

Advanced Energy Materials

131

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Rare earth doped materials with unique electronic ground state configurations are considered emerging alternatives to conventional Pt/C for the oxygen reduction reaction (ORR). Herein, gadolinium (Gd)‐induced valence structure engineering is, for the first, time investigated for enhanced oxygen electrocatalysis. The Gd2O3–Co heterostructure loaded on N‐doped graphene (Gd2O3–Co/NG) is constructed as the target catalyst via a facile sol–gel assisted strategy. This synthetic strategy allows Gd2O3–Co nanoparticles to distribute uniformly on an N‐graphene surface and form intimate Gd2O3/Co interface sites. Upon the introduction of Gd2O3, the ORR activity of Gd2O3–Co/NG is significantly increased compared with Co/NG, where the half‐wave potential (E1/2) of Gd2O3–Co/NG is 100 mV more positive than that of Co/NG and even close to commercial Pt/C. The density functional theory calculation and spectroscopic analysis demonstrate that, owing to intrinsic charge redistribution at the engineered interface of Gd2O3/Co, the coupled Gd2O3–Co can break the OOH*–OH* scaling relation and result in a good balance of OOH* and OH* binding on Gd2O3–Co surface. For practical application, a rechargeable Zn–air battery employing Gd2O3–Co/NG as an air–cathode achieves a large power density and excellent charge–discharge cycle stability.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Gadolinium‐Induced Valence Structure Engineering for Enhanced Oxygen Electrocatalysis

Wang

Yang

et al. 2020

Advanced Energy Materials

131

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“…Similar method was also applied to prepare the 2D Co−N−C material with single atom Co, which also has outstanding ORR performance measured in 0.1 M KOH ( E 1/2 =0.87 V) . In addition, 2D polymers and MOF nanosheets are also widely used as precursors to prepare M−N−C materials . Xia et al.…”

Section: D Metal‐nitrogen‐carbon Materials For the Oxygen Reduction mentioning

confidence: 99%

“…[133] In addition, 2D polymers and MOF nanosheets are also widely used as precursors to prepare MÀ NÀ C materials. [134][135][136][137][138][139] Xia et al prepared a Ce/CoÀ NÀ C material based on 2D leaf-like ZIF-67. [139] In summary of this section, 2D MÀ NÀ C electrocatalysts are usually constructed based on the graphene.…”

Section: D Metal-nitrogen-carbon Materials For the Oxygen Reduction mentioning

confidence: 99%

Importance of Electrocatalyst Morphology for the Oxygen Reduction Reaction

2019

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Proton/anion‐exchange membrane fuel cells (PEMFC and AEMFC), generating electricity from the H2 energy with zero‐carbon emission, have become very promising energy conversion devices to meet the increasing energy demand and reduce the dependence on fossil fuels. Currently, platinum (Pt) based materials have proven to be the most efficient electrocatalysts for the oxygen reduction reaction (ORR) at the cathode of the PEMFC and AEMFC. However, the high price and the limited reserve of Pt greatly hinder their industrial applications. Recently, transition metal‐nitrogen‐carbon (M−N−C) based material, as an efficient alternative to replace the precious metal Pt‐based material, has attracted researchers’ attention. Great contributions have been devoted to develop M−N−C based electrocatalysts. This review summarizes recent advances on M−N−C based electrocatalysts used for ORR from the point view of morphology. One‐dimensional (1D), two‐dimensional (2D), three‐dimensional (3D) and multi‐dimensional (MD) M−N−C materials were discussed thoroughly with particular attention on the relationship between the structure and the catalytic activity.

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“…[5,6] The advantages mentioned above have great value for the practical application of zincÀ air battery. [7,8] The oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) play important roles on the side of air electrode. [9][10][11] Because of high overpotential and slow kinetic process of ORR and OER, the usage of zincÀ air battery is severely limited.…”

Section: Introductionmentioning

confidence: 99%

In Situ Synthesis of Ultrathin Graphene‐Like Nanosheets as a Highly Effective Oxygen Catalyst for Zinc−Air Batteries

Song

et al. 2019

ChemElectroChem

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Two‐dimensional materials have large specific area, high electron transfer capability and abundant exposed active sites, which are beneficial to improve their catalytic properties. Here, we used a simple salt‐template method to construct ultrathin graphene‐like Fe/N−C nanosheets (named as Fe/GNS‐1.5). During the synthesis process, NaCl crystallite serves as a rigid template of two‐dimensional mesoscopic structure. Iron nitrate acts as a gas‐foaming agent, which plays pivotal part in the morphology and structure of catalysts. The obtained Fe/GNS‐1.5 nanosheets with a thickness of 3 nm have a large specific surface area (705 m2 g−1). Benefiting from the structure advantages, Fe/GNS‐1.5 exhibits a great bifunctional catalytic performance. The Fe/GNS‐1.5 catalyst is employed as air cathode of zinc−air battery to examine its practical application, which presents excellent power density (156 mW cm−2) and favorable cyclic stability for more than 600 cycles.

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The synergistic effect of Ceria and Co in N-doped leaf-like carbon nanosheets derived from a 2D MOF and their enhanced performance in the oxygen reduction reaction

Cited by 102 publications

References 28 publications

Gadolinium‐Induced Valence Structure Engineering for Enhanced Oxygen Electrocatalysis

Gadolinium‐Induced Valence Structure Engineering for Enhanced Oxygen Electrocatalysis

Importance of Electrocatalyst Morphology for the Oxygen Reduction Reaction

In Situ Synthesis of Ultrathin Graphene‐Like Nanosheets as a Highly Effective Oxygen Catalyst for Zinc−Air Batteries

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