Ni–Mo alloy nanostructures as cathodic materials for hydrogen evolution reaction during seawater electrolysis

Golgovici, Florentina; Pumnea, Alexandru; Petica, Aurora; Manea, Adrian; Brîncoveanu, Oana; Enăchescu, Marius; Anicăi, Liana

doi:10.1007/s11696-018-0486-7

Cited by 33 publications

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“…Corrosion due to Cland related Cloxidation products such as Cl2 can be a concern for electrode stability. While chloride oxidation products are primarily a concern for the anode, gas crossover is possible, 85 and in the presence of Cl2, increasing long-term stability [86][87][88][89] . PtMo (ref.…”

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Electrolysis of low-grade and saline surface water

et al. 2020

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Powered by renewable energy sources such as solar, marine, geothermal and wind, generation of storable hydrogen fuel through water electrolysis provides a promising path towards energy sustainability. However, state-of-the-art electrolysis requires support from associated processes such as desalination of water sources, further purification of desalinated water, and transportation of water, which often contribute financial and energy costs. One strategy to avoid these operations is to develop electrolysers that are capable of operating with impure water feeds directly. Here we review recent developments in electrode materials/catalysts for water electrolysis using low-grade and saline water, a significantly more abundant resource worldwide compared to potable water. We address the associated challenges in design of electrolysers, and discuss future potential approaches that may yield highly active and selective materials for water electrolysis in the presence of common impurities such as metal ions, chloride and bio-organisms. Freshwater is likely to become a scarce resource for many communities, with more than 80% of the world's population exposed to high risk levels of water security 1. This has been recognized within the Sustainable Development Goal 6 (SDG 6) on Clean Water and Sanitation 2. At the same time, low-grade and saline water is a largely abundant resource which, used properly, can address SDG 7 on Affordable and Clean Energy as well as SDG 13 on Climate Action. Hydrogen, a storable fuel, can be generated through water electrolysis and it may provide headway towards combating climate change and reaching zero emissions 3 , since the cycle of generation, consumption and regeneration of hydrogen can achieve carbon neutrality. In addition to providing a suitable energy store, hydrogen can be easily distributed and used in industry, households and transport. Hydrogen, and the related fuel cell industry, has the potential to bring positive economic and social impacts to local communities in terms of energy efficiency and job markets; globally the hydrogen market is expected to grow 33% to US$155 billion in 2022 4. However, there are remaining challenges related to the minimization of the cost and integration of hydrogen into daily life, as well as meeting the ultimate hydrogen cost targets of

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“…NiMo (refs. 87,88 ) alloys have also been shown to provide a promising combination of catalytic activity and longterm stability. The increased corrosion resistance of these alloys is attributed to competitive dissolution reactions between the guest M species with Cl2…”

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Electrolysis of low-grade and saline surface water

et al. 2020

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“…The large overpotential penalty required to sustain OER continues to be a severe bottleneck, impeding sustainability. In this direction, newer earth‐abundant catalytic materials and precursors that can replace expensive Ir and Ru‐based electrocatalysts, without compromising the performance, are in growing demand . Toward this direction, employing a thermally labile cobalt organophosphate polymer reported by us, Ahn and Tilley have earlier demonstrated a stable electrocatalyst with low onset overpotential and moderate overpotential over a range of neutral and alkaline pH .…”

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“…In this direction, newer earth-abundant catalytic materials and precursors that can replace expensive Ir and Ru-based electrocatalysts, without compromising the performance, are in growing demand. [1][2][3][4] Toward this direction, employing a thermally labile cobalt…”

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Compositional Control as the Key for Achieving Highly Efficient OER Electrocatalysis with Cobalt Phosphates Decorated Nanocarbon Florets

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et al. 2019

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Compositional interplay of two different cobalt phosphates (Co(H2PO4)2; Co‐DP and Co(PO3)2; Co‐MP) loaded on morphologically engineered high surface area nanocarbon leads to an increased electrocatalytic efficiency for oxygen evolution reaction (OER) in near neutral conditions. This is reflected as significant reduction in the onset overpotential (301 mV) and enhanced current density (30 mA cm−2 @ 577 mV). In order to achieve uniform surface loading, organic‐soluble thermolabile cobalt‐bis(di‐tert‐butylphosphate) is synthesized in situ inside the nanocarbon matrix and subsequently pyrolyzed at 150 °C to produce Co(H2PO4)2/Co(PO3)2 (80:20 wt%). Annealing this sample at 200 or 250 °C results in the redistribution of the two phosphate systems to 55:45 or 20:80 (wt%), respectively. Detailed electrochemical measurements clearly establish that the 55:45 (wt%) sample prepared at 200 °C performs the best as a catalyst, owing to a relay mechanism that enhances the kinetics of the 4e− transfer OER process, which is substantiated by micro‐Raman spectroscopic studies. It is also unraveled that the engineered nanocarbon support simultaneously enhances the interfacial charge‐transfer pathway, resulting in the reduction of onset overpotential, compared to earlier investigated cobalt phosphate systems.

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“…Potential Ni impacts the self-limiting growth crystallite and passivation effect [11]. In addition to the above advantages, DESs liquids enable the electrodeposition of nickel alloy coatings: Zn-Ni [12], Ni-Co-Sn [13], Fe-Ni [14], Ni-Co [15], Ni-Mo [16], and nickel composite coatings. Ni-carbon nanotubes composite coatings [17,18] have much better tribological properties than pure Ni [18].…”

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Ni/cerium Molybdenum Oxide Hydrate Microflakes Composite Coatings Electrodeposited from Choline Chloride: Ethylene Glycol Deep Eutectic Solvent

et al. 2020

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Cerium molybdenum oxide hydrate microflakes are codeposited with nickel from a deep eutectic solvent-based bath. During seven days of exposure in 0.05 M NaCl solution, the corrosion resistance of composite coating (Ni/CeMoOxide) is slightly reduced, due to the existence of some microcracks caused by large microflakes. Multielemental analysis of the solution, in which coatings are exposed and the qualitative changes in the surface chemistry (XPS) show selective etching molybdenum from microflakes. The amount of various molybdenum species within the surface of coating nearly completely disappear, due to the corrosion process. Significant amounts of Ce3+ compounds are removed, however the corrosion process is less selective towards the cerium, and the overall cerium chemistry remains unchanged. Initially, blank Ni coatings are covered by NiO and Ni(OH)2 in an atomic ratio of 1:2. After exposure, the amount of Ni(OH)2 increases in relation to NiO (ratio 1:3). For the composite coating, the atomic ratios of both forms of nickel vary from 1:0.8 to 1:1.3. Despite achieving lower corrosion resistance of the composite coating, the applied concept of using micro-flakes, whose skeleton is a system of Ce(III) species and active form are molybdate ions, may be interesting for applications in materials with potential self-healing properties.

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Ni–Mo alloy nanostructures as cathodic materials for hydrogen evolution reaction during seawater electrolysis

Cited by 33 publications

References 50 publications

Electrolysis of low-grade and saline surface water

Electrolysis of low-grade and saline surface water

Compositional Control as the Key for Achieving Highly Efficient OER Electrocatalysis with Cobalt Phosphates Decorated Nanocarbon Florets

Ni/cerium Molybdenum Oxide Hydrate Microflakes Composite Coatings Electrodeposited from Choline Chloride: Ethylene Glycol Deep Eutectic Solvent

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