Multimetallic Ni–Mo/Cu nanowires as nonprecious and efficient full water splitting catalyst

Zhao, Shunan; Huang, Jianfei; Liu, Yanyan; Shen, Jianhua; Wang, Hao; Yang, Xin; Zhu, Yihua; Li, Chunzhong

doi:10.1039/c6ta10749d

Cited by 91 publications

(62 citation statements)

References 42 publications

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“…However, although some previous works have shown that Ni−Mo is unstable in alkaline media, the origins of this instability have not been extensively studied to date, aside from one key work by Schalenbach et al., who reported that Ni−Mo can form multiple crystal phases depending on the ratio between Ni and Mo. Furthermore, they reported that Mo can leach from the material during electrocatalysis …”

Section: Introductionmentioning

confidence: 84%

“…Amongst these materials, one of the most promising ones is alloyed Ni−Mo, which is surmised to have a hydrogen bonding energy (HBE) similar to that of Pt, owing to the synergy between Ni and Mo in alkaline water splitting . Alkaline water splitting is considered because of its relevance in industry and the availability of better‐performing anodes in alkaline relative to acidic media …”

Section: Introductionmentioning

confidence: 99%

“…[6] Alkaline water splitting is considered because of its relevance in industry and the availability of better-performing anodes in alkaline relative to acidic media. [2,[7][8][9][10][11][12][13][14] Several strategies are employed to increaset he activity of NiÀMo, such as nanostructuring or using nanoparticles. [15][16][17] It can also be combined with light-absorbing materials as ac ocatalyst.…”

Section: Introductionmentioning

confidence: 99%

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Electrolyte Effects on the Stability of Ni−Mo Cathodes for the Hydrogen Evolution Reaction

et al. 2019

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Water electrolysis to form hydrogen as a solar fuel requires highly effective catalysts. In this work, theoretical and experimental studies are performed on the activity and stability of Ni−Mo cathodes for this reaction. Density functional theory studies show various Ni−Mo facets to be active for the hydrogen evolution reaction, Ni segregation to be thermodynamically favorable, and Mo vacancy formation to be favorable even without an applied potential. Electrolyte effects on the long‐term stability of Ni−Mo cathodes are determined. Ni−Mo is compared before and after up to 100 h of continuous operation. It is shown that Ni−Mo is unstable in alkaline media, owing to Mo leaching in the form of MoO42−, ultimately leading to a decrease in absolute overpotential. It is found that the electrolyte, the alkali cations, and the pH all influence Mo leaching. Changing the cation in the electrolyte from Li to Na to K influences the surface segregation of Mo and pushes the reaction towards Mo dissolution. Decreasing the pH decreases the OH− concentration and in this manner inhibits Mo leaching. Of the electrolytes studied, in terms of stability, the best to use is LiOH at pH 13. Thus, a mechanism for Mo leaching is presented alongside ways to influence the stability and make the Ni−Mo material more viable for renewable energy storage in chemical bonds.

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Section: Introductionmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electrolyte Effects on the Stability of Ni−Mo Cathodes for the Hydrogen Evolution Reaction

et al. 2019

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“…In the Se 3d region ( Figure 4D), the peaks at 54.3 and 58.6 eV correspond to Se 3d 5/2 and SeO x (Se species with a high oxide state), respectively. [52,53] Together with the result of XRD pattern shown in Figure S2 in the Supporting Information, the peaks at 932.4 and 952.0 eV can be assigned to metallic Cu 0 . The peak at 531.4 eV can be ascribed to the oxygen in oxyhydroxide (OOH), which indicates that some of Ni and Co in the surface of Ni 0.35 Co 0.65 Se 2 /CNW exist in the form of oxidation states such as γ-NiOOH and γ-CoOOH.…”

Section: Introductionmentioning

confidence: 63%

Nickel–Cobalt Diselenide Nanosheets Supported on Copper Nanowire Arrays for Synergistic Electrocatalytic Oxygen Evolution

Chen

Ren

et al. 2019

Adv Materials Inter

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water splitting. [7] So the synthesis of efficient electrocatalysts with high OER kinetics remains a field of great interest. Currently, noble metal (Ru and Ir)-based compounds are the efficient catalysts toward OER with high current density and low overpotential. [8] However, their scarcity and high cost greatly hindered large-scale application. Therefore, developing earth-abundant and cheap catalysts is necessary to improve OER activity and realize electrochemical water splitting. In recent years, metal oxides have been widely studied as earth-abundant catalysts for the OER, but there exist some inherent limitations such as low conductivity and poor catalytic kinetics. [9] Currently, transition metal phosphides and chalcogenides have emerged as highly active catalysts for OER. [10,11] Compared to the corresponding oxide counterparts, their better performances originated from the higher conductivities. Among these catalysts, transition metal selenides have attracted much attention due to their low cost, intrinsic metallic properties, and high activity. [12] Recent studies showed that, in the process of electrocatalysis, the surface of metal selenides can be partially oxidized into metal oxides, which were proved to be the true catalytically active species. The synergistic effects of high conductivity of metal selenide and high catalytically active species (metal oxides) formed on the outer surface of metal selenides provided excellent electrocatalytic activity. [13,14] In transition metal-based OER catalysts, Co-based and Nibased catalysts have exhibited excellent OER property. [15][16][17][18][19] Especially bimetallic Co-Ni-based electrocatalysts have exhibited significantly enhanced OER activity than monometallic Cobased and Ni-based catalysts. [20][21][22][23][24] The enhanced OER activity of bimetallic electrocatalysts mainly came from the flexible variable valence state of bimetallic elements and more active sites which originated from atomic defects. For example, Tüysüz and co-workers reported that the prepared ordered mesoporous nickel cobalt oxide showed greatly improved OER activity compared with single Ni or Co metal oxide electrocatalyst. [25] Meanwhile, nickel-cobalt selenides also exhibited remarkable performance in fields of electrochemical energy production and storage. [26][27][28][29] For example, Xu et al. prepared (Ni, Co)Se 2 Rational nanoarchitecture design and smart hybridization of bespoke catalysts can greatly accelerate the sluggish kinetics of oxygen evolution reaction (OER) in electrochemical water splitting. Here, hierarchical Ni x Co 1−x Se 2 porous nanosheets are synthesized on Cu nanowire arrays (CNW) to fabricate highly efficient core/shell structure integrated OER electrode. Highly conductive CNW arrays are first obtained via the reduction of the pre-prepared CuO nanowire arrays. Ni x Co 1−x precursor nanosheets are then grown on CNW via hydrothermal route, and the following selenylation led to in situ formation of Ni x Co 1−x Se 2 porous nanosheet. In the integrated electrode, ...

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“…After electrochemical anodization of pure copper foam at a constant current density of 10 mA cm −2 for 30 minutes and then as‐anodized nanowire thermal annealing at 180 °C for 1 h to form CuO NWs and the corresponding XRD pattern is shown in Figure (b) displays multiple diffraction peaks at 32.5°, 35.5°, 38.9°, 48.8°, 53.5°, 58.3°, 66.1°and 68.0°, which are attributed to (110), (002), (111), (−202), (020), (202), (310), and (220) crystal planes of CuO (JCPDS No. 080‐1916) . Furthermore, the in‐situ growth of Co‐MOF on the surface of CuO NWs and followed by pyrolysis of CuO NWs@Co MOF at 350 °C for 3 h at air atmosphere, and is examined by XRD diffraction pattern as shown in Figure (c).…”

Section: Resultsmentioning

confidence: 99%

Fabrication of Hierarchically Structured MOF‐Co₃O₄ on Well‐aligned CuO Nanowire with an Enhanced Electrocatalytic Property

Muthurasu

Kim

2019

Electroanalysis

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Engineering appropriate shape and size of three‐dimensional inorganic nanostructures materials is of one the main critical problems in pursuing high‐performance electrode materials. Herein, we fabricate a metal‐organic framework derived cobalt oxide (Co3O4) are grown on copper oxide nanowire (CuO NWs) supported on the surface of 3D copper foam substrate. The highly aligned CuO NWs were prepared by using electrochemical anodization of copper foam in ambient temperature and followed by MOF Co3O4 was grown via a simple in situ solution deposition then consequent calcination process. The obtained binder‐free 3D CuO NWs@Co3O4 nanostructures were further characterized by using X‐ray diffraction, X‐ray photoelectron spectroscopy, field‐emission scanning electron microscopy, and transmission electron microscopy. Furthermore, electrochemical sensing of glucose was studied by using Cyclic Voltammetry, and chronoamperometry techniques. Interestingly, 3D CuO NWs@Co3O4 electrode exhibits excellent performance for the oxidation of glucose compared with individual entities. The proposed sensor shows wide linear ranges from 0.5 μM to 0.1 mM with the sensitivity of 6082 μA/μM and the lowest detection limit (LOD) of 0.23 μM was observed with the signal to noise ratio, (S/N) of 3. The superior catalytic oxidation of glucose mainly is endorsed by the excellent electrical conductivity and synergistic effect of the Co3O4 and CuO NWs.

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Multimetallic Ni–Mo/Cu nanowires as nonprecious and efficient full water splitting catalyst

Abstract: Multimetallic Ni–Mo/Cu nanowires free-standing electrode (NM-CNW) was used as an excellent bifunctional electrocatalyst for full water splitting.

Cited by 91 publications

References 42 publications

Electrolyte Effects on the Stability of Ni−Mo Cathodes for the Hydrogen Evolution Reaction

Electrolyte Effects on the Stability of Ni−Mo Cathodes for the Hydrogen Evolution Reaction

Nickel–Cobalt Diselenide Nanosheets Supported on Copper Nanowire Arrays for Synergistic Electrocatalytic Oxygen Evolution

Fabrication of Hierarchically Structured MOF‐Co₃O₄ on Well‐aligned CuO Nanowire with an Enhanced Electrocatalytic Property

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Multimetallic Ni–Mo/Cu nanowires as nonprecious and efficient full water splitting catalyst

Abstract: Multimetallic Ni–Mo/Cu nanowires free-standing electrode (NM-CNW) was used as an excellent bifunctional electrocatalyst for full water splitting.

Cited by 91 publications

References 42 publications

Electrolyte Effects on the Stability of Ni−Mo Cathodes for the Hydrogen Evolution Reaction

Electrolyte Effects on the Stability of Ni−Mo Cathodes for the Hydrogen Evolution Reaction

Nickel–Cobalt Diselenide Nanosheets Supported on Copper Nanowire Arrays for Synergistic Electrocatalytic Oxygen Evolution

Fabrication of Hierarchically Structured MOF‐Co3O4 on Well‐aligned CuO Nanowire with an Enhanced Electrocatalytic Property

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Fabrication of Hierarchically Structured MOF‐Co₃O₄ on Well‐aligned CuO Nanowire with an Enhanced Electrocatalytic Property