Interface engineering of hierarchical NiCoP/NiCoS<sub><i>x</i></sub> heterostructure arrays for efficient alkaline hydrogen evolution at large current density

Han, Weiwei; Zhang, Fan; Qiu, Lingshu; Yang, Qian; Hao, Shaoyun; Li, Ping; He, Yi; Zhang, Xingwang

doi:10.1039/d2nr04657a

Cited by 23 publications

(6 citation statements)

References 52 publications

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“…Moreover, the binding energies of Ni 2+ and Ni 3+ have two oxidized peaks that can be matched to Ni(OH) 2 and its satellite peak (NiO), respectively. Whereas the metallic binding energies of Co are assigned to 783.45 and 804.47 eV, indicating the coexistence of Co 2+ and Co 3+ , , the binding energies of Co 2+ and Co 3+ correspond to Co(OH) 2 and its CoO, respectively. The presence of oxidized metals on the surface of NiCo-coated electrodes may be due to partial oxidation of the electrode surface or atmospheric exposure of electrodes during analysis.…”

Section: Resultsmentioning

confidence: 99%

Hydrogen Evolution Reaction Performance of Ni–Co-Coated Graphene-Based 3D Printed Electrodes

2023

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Additive manufacturing has been a very promising topic in recent years for research and development studies and industrial applications. Its electrochemical applications are very popular due to the cost-effective rapid production from the environmentally friendly method. In this study, three-dimensional (3D) printed electrodes are prepared by Ni and Co coatings in different molar ratios. Different Ni/Co molar ratios (x:y) of the Ni/Co/x:y alloys are prepared as 1:1, 1:4, and 4:1 and they are named Ni/Co/1:1, Ni/Co/4:1, and Ni/Co/1:4, respectively. According to the results, when the 3D electrode samples are coated with Ni and Co at different molar ratios, the kinetic performance of the NiCo-coated 3D electrode samples for hydrogen evolution reaction is enhanced compared to that of the uncoated 3D electrode sample. The results indicate that the Ni/Co/1:4-coated 3D electrode has the highest kinetic activity for hydrogen evolution reactions (HERs). The calculated Tafel′s slope and overpotential value (η10) for HER are determined as 164.65 mV/dec and 101.92 mV, respectively. Moreover, the Ni/Co/1:4-coated 3D electrode has an 81.2% higher current density than the other electrode. It is observed that the 3D printing of the electrochemical electrodes is very promising when they are coated with Ni–Co metals in different ratios. This study provides a new perspective on the use of 3D printed electrodes for high-performance water electrolysis.

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Section: Resultsmentioning

confidence: 99%

Hydrogen Evolution Reaction Performance of Ni–Co-Coated Graphene-Based 3D Printed Electrodes

2023

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“…The creation of Mo(OH) 2 may be related to the oxidation peak. Furthermore, the highest of Co-NF at 0.3 V relative to RHE could be due to the production of Co(OH) 2 . − …”

Section: Resultsmentioning

confidence: 99%

Construct of an Electrodeposited Cobalt–Molybdenum Film and Evaluation of Its Efficiency in Hydrogen Evolution

et al. 2023

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Hydrogen is a valuable clean energy source, and electrolysis to produce hydrogen from water is a crucial component. However, a major problem of hydrogen generation by electrolysis is its large overpotential and poor economics. To reduce the overpotential, we mainly use nickel foam and Co−Mo ions as feedstock and create an efficient catalytic material by electrodeposition. The Co−Mo interaction improves the current efficiency. In 1 mol/L NaOH solution, the overpotential of the Co−Mo-NF composites was low when the current density is −10 mA/cm 2 , with the best value reaching 45.3 mV, which is less than those of Co-NF (94.4 mV) and Mo-NF (88.2 mV). All deposits had similar Tafel slopes in the 77.9 mV/decade range. The catalyst does not just have a favorable effect on hydrogen formation but also has a surprisingly high double-layer capacitance (up to 180 mF/ cm 2 ) and good stability. This research provides an impactful approach for developing a non-precious metal HER catalyst for industrial hydrogen production.

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“…In the NiCoP/NiCoS x material constructed by Han et al, due to the strong interface coupling, the material has rich active sites and high conductivity interfaces, which efficiently reduces the reaction overpotential while the current density reaches 500 mA cm −2 at 222 mV, providing a new basis for the application of non-precious metal-based heterostructure catalysts in industrial production. 145 The HER process is accompanied by electron transfer, and one of the most crucial roles of electrocatalysts is to assist in electron transfer between the electrode's active catalytic sites and reactants, thus promoting the chemical conversion of intermediates. The electron density on the catalyst surface directly affects the reaction activity.…”

Section: Synergistic Effectmentioning

confidence: 99%

Section: Composite Catalystsmentioning

confidence: 99%

Non-precious metal-based heterostructure catalysts for hydrogen evolution reaction: mechanisms, design principles, and future prospects

Sun¹,

Li²,

Wang³

et al. 2023

Nanoscale

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Interface engineering of hierarchical NiCoP/NiCoS_x heterostructure arrays for efficient alkaline hydrogen evolution at large current density

Abstract: The development of non-noble metal electrocatalysts with high activity and long-term stability for hydrogen evolution reaction (HER), especially at large current density, is of great significance for industrial hydrogen production...

Cited by 23 publications

References 52 publications

Hydrogen Evolution Reaction Performance of Ni–Co-Coated Graphene-Based 3D Printed Electrodes

Hydrogen Evolution Reaction Performance of Ni–Co-Coated Graphene-Based 3D Printed Electrodes

Construct of an Electrodeposited Cobalt–Molybdenum Film and Evaluation of Its Efficiency in Hydrogen Evolution

Non-precious metal-based heterostructure catalysts for hydrogen evolution reaction: mechanisms, design principles, and future prospects

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Interface engineering of hierarchical NiCoP/NiCoSx heterostructure arrays for efficient alkaline hydrogen evolution at large current density

Abstract: The development of non-noble metal electrocatalysts with high activity and long-term stability for hydrogen evolution reaction (HER), especially at large current density, is of great significance for industrial hydrogen production...

Cited by 23 publications

References 52 publications

Hydrogen Evolution Reaction Performance of Ni–Co-Coated Graphene-Based 3D Printed Electrodes

Hydrogen Evolution Reaction Performance of Ni–Co-Coated Graphene-Based 3D Printed Electrodes

Construct of an Electrodeposited Cobalt–Molybdenum Film and Evaluation of Its Efficiency in Hydrogen Evolution

Non-precious metal-based heterostructure catalysts for hydrogen evolution reaction: mechanisms, design principles, and future prospects

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Interface engineering of hierarchical NiCoP/NiCoS_x heterostructure arrays for efficient alkaline hydrogen evolution at large current density