In situ electrochemical formation of NiSe/NiO<sub>x</sub>core/shell nano-electrocatalysts for superior oxygen evolution activity

Gao, Ruiqin; Li, Guodong; Hu, Jiabo; Wu, Yuanyuan; Lian, Xinran; Wang, Dejun; Zou, Xiaoxin

doi:10.1039/c6cy01810f

Cited by 81 publications

(41 citation statements)

References 70 publications

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“…In other work reported by Zou and co‐workers, a core–shell NiSe/NiO x nanowire array supported on Ni foam synthesized through a hydrothermal method and in situ electrochemical oxidation was developed to be a catalytic electrode. It also shows excellent catalytic performance toward OER . But regrettably, these NiSe/Ni foam based electrodes also cannot drive very high current density at low overpotentials, which limits their industrial application for water splitting.…”

Section: Water Splittingmentioning

confidence: 99%

Design and Application of Foams for Electrocatalysis

et al. 2017

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Developing low cost and efficient anode and cathode materials toward electrocatalysis are regarded as one of the most desirable yet challenging research directions, which are intimately related to the pressing energy, environmental and human health issues. Currently, 3 D foam (such as Ni foam, Cu foam, and graphene foam) based heterogeneous catalysts have been intensively explored for actively catalyzing the electrode reactions. Their inherent characteristics of stereo‐network structure, high specific area and large pore volume not only provide better mass transport of reactants to electrode surfaces, but also pave 3 D electron transport pathways. Herein, recent significant progress and rational design of foam‐based electrocatalysts are reviewed. In addition, some insights into current challenges and future directions of foams for efficient electrocatalysis are proposed and discussed.

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Section: Water Splittingmentioning

confidence: 99%

Design and Application of Foams for Electrocatalysis

et al. 2017

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“…[1][2][3] The oxygen evolution reaction (OER) involves breaking O-H bonds to form O=O bonds, what comprises four sequential proton-coupled electron transfer steps. [4][5][6][7] Currently noble metals are used to catalyze this reaction, but activities and stabilities are still not satisfactory and the high cost of these catalysts compromises the system cost-effectiveness. Thus the development of highly efficient and robust OER catalysts based on earth-abundant elements is a topic of capital importance.…”

Section: Introductionmentioning

confidence: 99%

“…However, some of these compounds are thermodynamically unstable under harsh OER conditions and may suffer chemical transformation during operation. 2,6,[29][30][31] While this instability has been ignored in most studies, when analyzed in detail, the excellent performances obtained for chalcogenides and pnictides have in some cases been related not to the chalcogenide or pnictide cations, but to the in situ formed oxide or (oxy)hydroxide. [32][33][34][35][36][37][38][39] For example, the OER activity of CoSx, 40 NiS, 27 NiSe, 6 and NixFe1-xSe2 41 catalysts was demonstrated to be related to the partial or complete oxidization of the chalcogenide to the corresponding oxide/(oxy)hydroxide.…”

Section: Introductionmentioning

confidence: 99%

In Situ Electrochemical Oxidation of Cu₂S into CuO Nanowires as a Durable and Efficient Electrocatalyst for Oxygen Evolution Reaction

et al. 2019

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The development of cost-effective oxygen evolution catalysts is of capital importance for the deployment of large scale energy storage systems based on metal-air batteries and reversible fuel cells. In this direction, a wide range of materials have been explored, especially in more favorable alkaline conditions, and several metal chalcogenides have particularly demonstrated excellent performances. However, chalcogenides are thermodynamically less stable than the corresponding oxides and hydroxides under oxidizing potentials in alkaline media. While this instability in some cases has prevented the application of chalcogenides as oxygen evolution catalysts, and it has been disregarded in some other, we propose to use it in our favor to produce high performance oxygen evolution catalysts. We characterize here the in situ chemical, structural and morphological transformation during the oxygen evolution reaction (OER) in alkaline media of Cu2S into CuO nanowires (NWs), mediating the intermediate formation of Cu(OH)2. We also test their OER activity and stability under OER operation in alkaline media, and compare them with the OER performance of Cu(OH)2 and CuO nanostructures directly grown on the surface of a copper mesh. We demonstrate here that CuO produced during OER from Cu 2 S displays an extraordinary electrocatalytic performance toward OER, well above that of CuO and Cu(OH)2 synthesized mediating no OER in situ transformation.3

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“…X‐ray photoelectron spectroscopy (XPS) was used to further verify the chemical compositions of the NiCo‐LDH@Ni‐CAT (Figure c). The binding energy of Ni 2p 3/2 and Ni 2p 1/2 was at 855.5 eV and 873.25 eV, respectively (Figure d), corresponding to Ni 2+ ,. The spin‐orbit splitting peaks of Co 2p 3/2 (781.1 eV) and Co2p 1/2 (796.5 eV) reaches 15.4 eV, and the intensity of the Co2p 3/2 satellite line is pretty low (Figure e), indicating the coexistence of Co 2+ and Co 3+ in NiCo‐LDH@Ni‐CAT ,.…”

Section: Resultsmentioning

confidence: 97%

Conductive 2D Metal‐Organic Frameworks Decorated on Layered Double Hydroxides Nanoflower Surface for High‐Performance Supercapacitor

Zhao

et al. 2018

ChemistrySelect

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The conductive two-dimensional metal-organic framework (Ni-CAT) nanocones were decorated on the flower petals surface of layered double hydroxide (NiCo-LDH) based nanoflowers, just like the surface microstructure of lotus leaves. This interesting composite structure displays excellent specific capacitance of 882 F g À 1 at a current density of 1 A g À 1 , resulting from the synergistic between Ni-CAT and NiCo-LDH. An assembled asymmetric supercapacitor (ASC) using NiCo-LDH@Ni-CAT as positive electrode, which also diaplays high energy density of 23.5 Wh kg À 1 at power density of 394.6 W kg À 1 and long-term cycling stability up to 82% after 10,000 cycles. Therefore, this work demonstrates an excellent method of the designing and fabricating hybrid electrode materials based on conductive two-dimensional metal-organic frameworks and layered double hydroxides to apply in supercapacitors.

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In situ electrochemical formation of NiSe/NiO_xcore/shell nano-electrocatalysts for superior oxygen evolution activity

Abstract: Despite the superior oxygen evolution electrocatalytic activity of metal-selenide nanostructures, especially when compared with their oxide counterparts, the origin behind their excellent activity remains unclear.

Cited by 81 publications

References 70 publications

Design and Application of Foams for Electrocatalysis

Design and Application of Foams for Electrocatalysis

In Situ Electrochemical Oxidation of Cu₂S into CuO Nanowires as a Durable and Efficient Electrocatalyst for Oxygen Evolution Reaction

Conductive 2D Metal‐Organic Frameworks Decorated on Layered Double Hydroxides Nanoflower Surface for High‐Performance Supercapacitor

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In situ electrochemical formation of NiSe/NiOxcore/shell nano-electrocatalysts for superior oxygen evolution activity

Abstract: Despite the superior oxygen evolution electrocatalytic activity of metal-selenide nanostructures, especially when compared with their oxide counterparts, the origin behind their excellent activity remains unclear.

Cited by 81 publications

References 70 publications

Design and Application of Foams for Electrocatalysis

Design and Application of Foams for Electrocatalysis

In Situ Electrochemical Oxidation of Cu2S into CuO Nanowires as a Durable and Efficient Electrocatalyst for Oxygen Evolution Reaction

Conductive 2D Metal‐Organic Frameworks Decorated on Layered Double Hydroxides Nanoflower Surface for High‐Performance Supercapacitor

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In situ electrochemical formation of NiSe/NiO_xcore/shell nano-electrocatalysts for superior oxygen evolution activity

In Situ Electrochemical Oxidation of Cu₂S into CuO Nanowires as a Durable and Efficient Electrocatalyst for Oxygen Evolution Reaction