The thermal stability of the β-Ni(OH)2-β-NiOOH system

Horányi, T.S.

doi:10.1016/0040-6031(89)87217-x

Cited by 16 publications

(12 citation statements)

References 15 publications

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“…XPS spectra reveal that although there is still significant ratio of metallic Ni present in the obtained PtNi/C, negligible metallic state Ni is observed in the PtNi-O/C (Figure B), confirming the segregation and oxidation of Ni to the surface. , Interestingly, there is significantly more NiO but less Ni(OH) 2 in XPS spectra of PtNi-O/C compared to PtNi/C (Figure B), , which can be explained by the dehydration of Ni(OH) 2 during annealing . According to the XPS spectra, the Pt in both PtNi/C, PtNi-O/C is mainly in the form of metallic Pt.…”

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confidence: 99%

Surface-Engineered PtNi-O Nanostructure with Record-High Performance for Electrocatalytic Hydrogen Evolution Reaction

et al. 2018

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Hydrogen holds the potential of replacing nonrenewable fossil fuel. Improving the efficiency of hydrogen evolution reaction (HER) is critical for environmental friendly hydrogen generation through electrochemical or photoelectrochemical water splitting. Here we report the surface-engineered PtNi-O nanoparticles with enriched NiO/PtNi interface on surface. Notably, PtNi-O/C showed a mass activity of 7.23 mA/μg at an overpotential of 70 mV, which is 7.9 times higher compared to that of the commercial Pt/C, representing the highest reported mass activity for HER in alkaline conditions. The HER overpotential can be lowered to 39.8 mV at 10 mA/cm when platinum loading was only 5.1 μg/cm, showing exceptional HER efficiency. Meanwhile, the prepared PtNi-O/C nanostructures demonstrated significantly improved stability as well as high current performance which are well over those of the commercial Pt/C and demonstrated capability of scaled hydrogen generation.

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confidence: 99%

Surface-Engineered PtNi-O Nanostructure with Record-High Performance for Electrocatalytic Hydrogen Evolution Reaction

et al. 2018

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“…Elbaz et al [56] reported for various nickel oxy/hydroxyl materials the diffusion of atomic hydrogen. The release of water upon annealing was reported for various Ni hydroxyl materials [57], [58], [59], [60]. In three of these studies, a H 2 O desorption temperature near 300 °C was also found [58], [59], [60].…”

Section: Role Of Hydrogen Retainment In the Layersmentioning

confidence: 88%

Effective Hydrogenation of Poly-Si Passivating Contacts by Atomic-Layer-Deposited Nickel Oxide

Phung

Helvoirt

Beyer³

et al. 2022

IEEE J. Photovoltaics

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In recent years, passivating contacts based on SiO 2 /poly-Si have proven to be an enabling technology for Si solar cells. Effective hydrogenation of the interfacial SiO 2 is vital for realizing efficient contacts. Hydrogen-rich dielectrics, such as SiN x and Al 2 O 3 , are commonly employed for hydrogenation, whereas also recently, n-type conductive oxides, such as In 2 O 3 :Sn and ZnO, have been demonstrated to yield excellent hydrogenation. This study presents the use of a p-type metal oxide, specifically NiO, as a suitable hydrogenation source. The p-type character of NiO makes it an interesting candidate for hydrogenation because of its potential use in selective contacting structures. Herein, we show that NiO, synthesized by atomic layer deposition (ALD), can be used to hydrogenate poly-Si/SiO 2 contacts effectively. Furthermore, we benchmark its hydrogenation performance to the established ALD ZnO/Al 2 O 3 stack and provide insights into the hydrogenation process. On planar surfaces, NiO yields almost as excellent results as ZnO/Al 2 O 3 stacks, whereas it lags behind on more challenging textured surfaces. Interestingly, even though elastic recoil detection analysis reveals that ALD NiO is rich in hydrogen, secondary ion mass spectrometry measurements show that, when NiO is compared to the ZnO/Al 2 O 3 stack, less hydrogen is present at the Si/SiO 2 interface after annealing. This is explained from effusion measurements, which show substantial effusion of hydrogen from NiO around 300 °C. Hence, Al 2 O 3 capping is further employed to prevent hydrogen loss and on textured wafers, the NiO/Al 2 O 3 stacks on poly-Si achieve an implied open-circuit voltage of 728 mV, confirming the excellent hydrogenation from ALD metal oxides.

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“…The phase attribution for this cluster is based on two points. Firstly, the dehydration of NiO(OH) occurs in the 100 -300°C temperature range and leads to the formation of NiO, as shown for instance by Horanyi (1989). Secondly, according to the P O2 -temperature phase diagram of the ternary system Ni-Co-O calculated for Co/(Ni + Co) = 0.06 (Figure SI-4) a) and knowing that the thermal treatment was carried out without exogenous oxygen (À30 < log(PO 2(g) ) < À20), the stable oxide phase is the monoxide Ni 0.94 Co 0.06 O.…”

Section: Clustermentioning

confidence: 99%

A multi-analytical methodology for the characterization of industrial samples of spent Ni-MH battery powders

et al. 2020

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The thermal stability of the β-Ni(OH)2-β-NiOOH system

Cited by 16 publications

References 15 publications

Surface-Engineered PtNi-O Nanostructure with Record-High Performance for Electrocatalytic Hydrogen Evolution Reaction

Surface-Engineered PtNi-O Nanostructure with Record-High Performance for Electrocatalytic Hydrogen Evolution Reaction

Effective Hydrogenation of Poly-Si Passivating Contacts by Atomic-Layer-Deposited Nickel Oxide

A multi-analytical methodology for the characterization of industrial samples of spent Ni-MH battery powders

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