NiCo2O4 nanowire arrays rich in oxygen deficiencies for hydrogen evolution reaction

Wei, Baodian; Wu, Jiangtao; Gui, M.; Qi, Zhengbing; Hu, Wenyuan; Wang, Zhoucheng

doi:10.1016/j.ijhydene.2019.01.183

Cited by 45 publications

(23 citation statements)

References 38 publications

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“…Notably, nanospheres decorated with spike-like morphology comprised of NC1 elucidates the small overpotential of À144 and À142 mV vs RHE to reach the η 10 in the alkaline and acid medium, respectively. The perceived NC1 electrocatalytic HER behavior results are considerably greater than various metal oxidebased results such as mixed-phase air-NiCo 2 O 4 (226 mV vs RHE), 41 NiCo 2 O 4 (À317 mV), 42 Co 2 MnO 4 /NF (À158 mV), 43 FeOOH/NiCo 2 O 4 (À146 mV), 44 NiFe-LDH/NiCo 2 O 4 composite (À192 mV) 45 and so on. The observed improved electrocatalytic behavior is considerably achieved by the enhanced surface characteristics of well-organized and interconnected nanospheres on spike-like domains, which stimulates plentiful active edges and large surface area, which creates maximum relations with electrolyte, thereby accomplishing the effective electron transference through the junction.…”

Section: Hydrogen Evolutionmentioning

confidence: 83%

Hierarchical NiCo / NiO / NiCo ₂ O ₄ composite formation by solvothermal reaction as a potential electrode material for hydrogen evolutions and asymmetric supercapacitors

et al. 2021

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Electrochemical energy storage and conversion mechanisms are highly viable routes in the current scenario, and hence supercapacitor and electrolysis of water splitting have gained significant attention in recent times. Thus, transition metal nickel cobalt oxides are widely inspected as promising electrode materials for electrocatalysis and supercapacitors. However, the pure NiCo 2 O 4 was highly hindered by its widespread uses due to low electronic conductivity and deficient active edges. This study is aimed to fabricate the NiCo/NiO/NiCo 2 O 4 composite using a solvothermal process with different ratios of solvents. The inherent NiCo/NiO/NiCo 2 O 4 composite holds plentiful active edges and improved electrical conductivity than the pure. Interestingly, the electrocatalytic results revealed that the NiCo/NiO/NiCo 2 O 4 (NC) composite prepared by a solvent ratio of (dou-

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Section: Hydrogen Evolutionmentioning

confidence: 83%

Hierarchical NiCo / NiO / NiCo ₂ O ₄ composite formation by solvothermal reaction as a potential electrode material for hydrogen evolutions and asymmetric supercapacitors

et al. 2021

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“…This is due to the existence of a more significant number of oxygen vacancies. An increasing number of these vacancies is caused by the different partial pressure of the oxygen particles, which leads to a pronounced effect on the oxygen evolution [ 41 ].…”

Section: Resultsmentioning

confidence: 99%

Spinel of Nickel-Cobalt Oxide with Rod-Like Architecture as Electrocatalyst for Oxygen Evolution Reaction

et al. 2020

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The renewable energy technologies require electrocatalysts for reactions, such as the oxygen and/or hydrogen evolution reaction (OER/HER). They are complex electrochemical reactions that take place through the direct transfer of electrons. However, mostly they have high over-potentials and slow kinetics, that is why they require electrocatalysts to lower the over-potential of the reactions and enhance the reaction rate. The commercially used catalysts (e.g., ruthenium nanoparticles—Ru, iridium nanoparticles—Ir, and their oxides: RuO2, IrO2, platinum—Pt) contain metals that have poor stability, and are not economically worthwhile for widespread application. Here, we propose the spinel structure of nickel-cobalt oxide (NiCo2O4) fabricated to serve as electrocatalyst for OER. These structures were obtained by a facile two-step method: (1) One-pot solvothermal reaction and subsequently (2) pyrolysis or carbonization, respectively. This material exhibits novel rod-like morphology formed by tiny spheres. The presence of transition metal particles such as Co and Ni due to their conductivity and electron configurations provides a great number of active sites, which brings superior electrochemical performance in oxygen evolution and good stability in long-term tests. Therefore, it is believed that we propose interesting low-cost material that can act as a super stable catalyst in OER.

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“…Moreover, the NiCo 2 O 4 NWA's with rich oxygen deficiencies require a low HER overpotential of 104 mV to achieve 10 mA cm −2 ; such catalysts also exhibit superior long‐term durability for 24 h at 100 mA cm −2 . [ 322 ] Recently, an optimized oxygen vacancy (OV) content in self‐supported OV‐rich NiCo 2 O 4 NWA's was found to exhibit a higher HER activity and improved stability in alkaline media compared to its counterparts with lower OV contents. [ 323 ] Similarly, Ni 3 S 2 –Co 9 S 8 heterostructure NWs supported on NF were fabricated by a two‐step hydrothermal method.…”

Section: Hydrogen Evolution (Her) and Oxygen Evolution Reactions (Oer...mentioning

confidence: 99%

Developments and Perspectives on Robust Nano‐ and Microstructured Binder‐Free Electrodes for Bifunctional Water Electrolysis and Beyond

Chandrasekaran

Khandelwal

Fan

et al. 2022

Advanced Energy Materials

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Ni, Fe, and Cu foams to form robust binder-free electrodes for high-performance electrocatalytic reactions. [55][56][57][58][59] Interestingly, multidimensional electrocatalysts grown at the nanoscale on a range of current collectors, namely substrates and will benefit from a strong adhesion with the current collector to avoid catalyst delamination, limited active sites, and charge transfer blockage to enhance catalytic reactions (Figure 1b-d). [9,[60][61][62][63][64] Key Prospects, Insights, and the Dynamic Properties of Nano-and Microstructured Binder-Free Electrocatalysts and Their Direct Impact on Electrochemical ReactionsWater splitting has become one of the most important technologies to produce hydrogen (H 2 ) in high purity form. Water splitting includes two half-reactions, namely the cathodic HER and anodic OER. [8,65] Generally, the electrocatalytic performance and activity are highly sensitive to local reaction conditions and is largely valued by the energy required for adsorption/desorption of reaction intermediates and the rupture/creation of chemical bonds. Hence, the conventional powder form of precious metals such as Pt/C for the HER and RuO 2 or IrO 2 for the OER are considered ideal electrocatalysts. [66] In addition, several nonprecious 1D, 2D, and 3D nano-and microstructured powder catalysts such as MoS 2 , WS 2 , Ni 3 S 2 , NiCo 2 S 4 are also of interest for the HER and OER reactions. [54,[67][68][69][70][71][72][73][74] However, for commercial purposes and practical applica-

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NiCo2O4 nanowire arrays rich in oxygen deficiencies for hydrogen evolution reaction

Cited by 45 publications

References 38 publications

Hierarchical NiCo / NiO / NiCo ₂ O ₄ composite formation by solvothermal reaction as a potential electrode material for hydrogen evolutions and asymmetric supercapacitors

Hierarchical NiCo / NiO / NiCo ₂ O ₄ composite formation by solvothermal reaction as a potential electrode material for hydrogen evolutions and asymmetric supercapacitors

Spinel of Nickel-Cobalt Oxide with Rod-Like Architecture as Electrocatalyst for Oxygen Evolution Reaction

Developments and Perspectives on Robust Nano‐ and Microstructured Binder‐Free Electrodes for Bifunctional Water Electrolysis and Beyond

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NiCo2O4 nanowire arrays rich in oxygen deficiencies for hydrogen evolution reaction

Cited by 45 publications

References 38 publications

Hierarchical NiCo / NiO / NiCo 2 O 4 composite formation by solvothermal reaction as a potential electrode material for hydrogen evolutions and asymmetric supercapacitors

Hierarchical NiCo / NiO / NiCo 2 O 4 composite formation by solvothermal reaction as a potential electrode material for hydrogen evolutions and asymmetric supercapacitors

Spinel of Nickel-Cobalt Oxide with Rod-Like Architecture as Electrocatalyst for Oxygen Evolution Reaction

Developments and Perspectives on Robust Nano‐ and Microstructured Binder‐Free Electrodes for Bifunctional Water Electrolysis and Beyond

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Hierarchical NiCo / NiO / NiCo ₂ O ₄ composite formation by solvothermal reaction as a potential electrode material for hydrogen evolutions and asymmetric supercapacitors

Hierarchical NiCo / NiO / NiCo ₂ O ₄ composite formation by solvothermal reaction as a potential electrode material for hydrogen evolutions and asymmetric supercapacitors