Amorphous nickel oxide electrodes with high-current-density electrocatalytic performance for hydrogen evolution

Jiang, Jian‐Hong; Dou, Henri; Cao, Meng; Du, Lei‐Ya; Yan, Yong; Wang, Xiaodan; Chen, Changzhong; Yang, Lijuan; Deng, Bin; He, Hongbo

doi:10.1016/j.ijhydene.2023.07.093

Cited by 8 publications

(4 citation statements)

References 46 publications

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“…5 Producing hydrogen by the electrolysis of water can convert renewable energy into green hydrogen, to serve as an energy carrier, which is one of the most promising methods to make storable green energy available, and it can achieve a sustainable hydrogen economy. 6 Hydrogen, owing to its higher gravimetric energy density than any other known fuel, i.e., a lower heating value of ∼120 kJ g −1 , 7 and because of its clean and sustainable features, is a promising energy carrier that plays a key role in our energy landscapes. 8 The water-splitting reaction is one of the most efficient ways to produce high-quality hydrogen and oxygen.…”

Section: Introductionmentioning

confidence: 99%

“…TM-based nanomaterials (Fe, Co, Ti, Cu, and Ni) have been studied extensively as catalysts for HER. Among them, nickel-based electrocatalysts, particularly nickel oxide, have attracted considerable attention for HER electrocatalytic application due to their high abundance, low cost, high corrosion resistance, storage capacity, and remarkable electrochemical capabilities. ,− Besides nickel, titanium oxide-based nanomaterials have also been heavily investigated as electrocatalysts. Especially, TiO 2 -based nanomaterials that are decorated with other catalytically active metals prepared by hydrothermal treatment methods directly on Ti substrates have been highly investigated …”

Section: Introductionmentioning

confidence: 99%

“…Hence, with an increasing reliance on renewable energy, there will be an increasing need to transform the harvested green energy into storable and transportable energy carriers . Producing hydrogen by the electrolysis of water can convert renewable energy into green hydrogen, to serve as an energy carrier, which is one of the most promising methods to make storable green energy available, and it can achieve a sustainable hydrogen economy . Hydrogen, owing to its higher gravimetric energy density than any other known fuel, i.e., a lower heating value of ∼120 kJ g –1 , and because of its clean and sustainable features, is a promising energy carrier that plays a key role in our energy landscapes .…”

Section: Introductionmentioning

confidence: 99%

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Hydrothermally Fabricated NiO@TiO₂–Nanofiber Composite for Efficient Electrocatalytic Hydrogen Evolution Reaction

Haile,

Cobet,

Ulbricht

et al. 2024

J. Phys. Chem. C

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Nowadays, hydrogen fuel is becoming more popular, and it is attracting significant attention as a sustainable and environmentally benign energy source owing to its zero emission of harmful substances and high energy density. Hydrogen generation through the electrocatalytic hydrogen evolution reaction (HER) employs economically inexpensive and selfsupported electrocatalysts that hold immense potential to provide a sustainable and cost-effective fuel in the future energy scenario. A self-supported NiO@TiO 2 nanofiber composite on Ti-foil is synthesized via a hydrothermal approach, and it is used as an electrocatalyst in the HER under alkaline conditions. The surface morphology, crystalline structure, and chemical composition of the electrode are analyzed by using high-resolution scanning electron microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy, which confirms that NiO nanoparticles are anchored to the surface of TiO 2 nanofibers. Investigation of the electrocatalytic properties of the NiO@TiO 2 nanofiber composite in a 1 M KOH electrolyte solution for the HER showed an overpotential of 144 mV at 10 mA cm −2 with a Tafel slope of 152.34 mV dec −1 . The NiO that is anchored to the TiO 2 nanofibers creates more catalytically active sites, which increases the surface area and enhances the HER performance. The charge transfer resistance of R ct = 41.6 Ω is determined from the electrode kinetics analyzed by using an electrochemical impedance spectroscopy Nyquist plot. The chronopotentiometric stability test confirms that the NiO@TiO 2 composite electrode shows a robust production of H 2 gas with only 7.6% potential deviation after 12 h of electrocatalytic activity. Furthermore, a Faradaic efficiency of 86% for hydrogen is achieved after 100 min of the HER. The results confirm that the NiO@TiO 2 nanofiber composite is a promising candidate material for the electrocatalysis of the HER.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hydrothermally Fabricated NiO@TiO₂–Nanofiber Composite for Efficient Electrocatalytic Hydrogen Evolution Reaction

Haile,

Cobet,

Ulbricht

et al. 2024

J. Phys. Chem. C

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“…At present, due to the high electroconductibility of the crystalline phase and the richly nonsaturable coordination of the amorphous phase, the crystalline–amorphous structure has been proved to be a hopeful HER catalyst design. , The crystalline phase accelerates electron transfer and the nonsaturable coordination sites of the amorphous phase furnish ample reactive active sites. − In addition, in order to strengthen the electrical conductivity of the electrode, a possible strategy is to grow materials in situ on conductive substrates, such as carbon cloth, carbon paper, graphene, MXene, and metal foam (Ni, Cu, etc. ). − This not only averts the utilization of expensive conductive polymer binders and the extra procedure of the electrode preparation process but also increases the specific surface area and electron transfer rate, stabilizing the working electrode and thus revealing prominent electrocatalytic properties. − …”

Section: Introductionmentioning

confidence: 99%

Hollow and Ultrathin Mo-Doped CoP Bamboo-Leaf Nanoarrays for pH-Universal Hydrogen Evolution

Zhao,

Jiang,

Zhao

et al. 2024

ACS Appl. Nano Mater.

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The rational design of cost-effective electrocatalysts for the hydrogen evolution reaction (HER) still remains a major challenge in continuable energy storage and conversion systems. In this study, vertically hollow and ultrathin Mo-doped CoP (Mo-CoP) nanoarrays are prepared on nickel foam by hydrothermal and low-temperature phosphating strategies. The Mo-CoP nanoarrays possess a bamboo-leaf structure with the diameter ranging from 20 to 150 nm between the top and the bottom and the length of several microns. At the same time, the Mo-CoP substance presents a crystalline−amorphous structure. The synergistic effect of doping and special construction can supply plentiful active sites, enhance electrolyte penetration, and facilitate gas diffusion in the process of the electrocatalytic reaction. The overpotentials of the Mo-CoP electrode at 10 mA cm −2 are as low as 88.4, 78.7, and 112.6 mV, and the Tafel slopes are 87.2, 55.7, and 120.3 mV dec −1 in alkaline, acidic, and neutral electrolytes, respectively. Moreover, the Mo-CoP catalyst also displays a favorable long-term stability in all pH ranges.

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Fe‐Rich Medium‐Entropy Core‐Shell Electrocatalyst for Hydrogen Evolution Reaction Under Large Current Density

Shao,

Ni,

Yin

et al. 2024

Small

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In response to the low stability of expensive Pt under large current, exploring the stable, efficient and cost‐competitive electrocatalyst for hydrogen evolution reaction is crucial for advancing green hydrogen production. Here, a strategy relating to constructing the core‐shell structure with near‐zero‐resistance homogeneous interface is applied to synthesize new Fe‐rich medium‐entropy alloy (MEA) catalyst. This low‐cost sample presents both outstanding durability and catalytic activity with an overpotential of 343.6 mV at 1,000 mA cm−2 as well as Tafel slope of 67.6 mV dec−1, respectively much lower than benchmark catalyst 20%Pt/C (416.9 mV, 156.8 mV dec−1) in 1.0 m KOH solution. Such properties are attributed to the enhanced reactivity of surface active sites with electrons easy injection from MEA metallic core to MEO (medium entropy oxide) shell via their highly conductive homogeneous interface. In MEO layer, Fe/Ni/Co sites are identified as active centres and their high oxidation is crucial to shift themselves toward deep energy, weakening Metal─H bonding and thereby accelerating hydrogen evolution. This work not only exploits one novel electrocatalyst suitable for industrial high‐current environments but also provides broad application prospects for MEA utilization.

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Amorphous nickel oxide electrodes with high-current-density electrocatalytic performance for hydrogen evolution

Cited by 8 publications

References 46 publications

Hydrothermally Fabricated NiO@TiO₂–Nanofiber Composite for Efficient Electrocatalytic Hydrogen Evolution Reaction

Hydrothermally Fabricated NiO@TiO₂–Nanofiber Composite for Efficient Electrocatalytic Hydrogen Evolution Reaction

Hollow and Ultrathin Mo-Doped CoP Bamboo-Leaf Nanoarrays for pH-Universal Hydrogen Evolution

Fe‐Rich Medium‐Entropy Core‐Shell Electrocatalyst for Hydrogen Evolution Reaction Under Large Current Density

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Amorphous nickel oxide electrodes with high-current-density electrocatalytic performance for hydrogen evolution

Cited by 8 publications

References 46 publications

Hydrothermally Fabricated NiO@TiO2–Nanofiber Composite for Efficient Electrocatalytic Hydrogen Evolution Reaction

Hydrothermally Fabricated NiO@TiO2–Nanofiber Composite for Efficient Electrocatalytic Hydrogen Evolution Reaction

Hollow and Ultrathin Mo-Doped CoP Bamboo-Leaf Nanoarrays for pH-Universal Hydrogen Evolution

Fe‐Rich Medium‐Entropy Core‐Shell Electrocatalyst for Hydrogen Evolution Reaction Under Large Current Density

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Product

Resources

About

Hydrothermally Fabricated NiO@TiO₂–Nanofiber Composite for Efficient Electrocatalytic Hydrogen Evolution Reaction

Hydrothermally Fabricated NiO@TiO₂–Nanofiber Composite for Efficient Electrocatalytic Hydrogen Evolution Reaction