Facile synthesis of Ni/NiO nanocomposites: the effect of Ni content in NiO upon the oxygen evolution reaction within alkaline media

Srinivasa, N.; Hughes, J. P.; Adarakatti, Prashanth Shivappa; Manjunatha, C; Rowley‐Neale, Samuel J.; Ashoka, S.; Banks, Craig E.

doi:10.1039/d0ra10597j

Cited by 51 publications

(9 citation statements)

References 69 publications

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“…Using XRD, the phase structures of the samples are revealed (Figure b). Compared to the two other benchmark samples above, the XRD pattern of Ni–Co–Mn oxides ball milled with BTC mostly fits the peaks of spinel MnCo 2 O 4 with several smaller peaks of NiO and CoO, indicating a high MnCo 2 O 4 content (see Supporting Information, Figure S4 for XRD patterns of the two benchmark samples). , In detail, the observed peaks are (111), (220), (311), (222), (400), (422), (511), (440), and (533) planes of MnCo 2 O 4 , (111) and (200) planes of NiO, and (100) and (200) planes of CoO. , …”

Section: Resultsmentioning

confidence: 76%

“…Using XRD, the phase structures of the samples are revealed (Figure 2b indicating a high MnCo 2 O 4 content (see Supporting Information, Figure S4 for XRD patterns of the two benchmark samples). 38,39 In detail, the observed peaks are (111), ( 220), (311), ( 222), (400), ( 422), ( 511), (440), and (533) planes of MnCo 2 O 4 , 38 (111) and (200) planes of NiO, 40 and (100) and (200) planes of CoO. 41,42 The corresponding high-resolution TEM analysis also corroborates the phase composition of Ni−Co−Mn oxides (Figure 2c).…”

Section: Methodsmentioning

confidence: 96%

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Nanostructured Ball-Milled Ni–Co–Mn Oxides from Spent Li-Ion Batteries as Electrocatalysts for Oxygen Evolution Reaction

Balqis

Irmawati

Geng

et al. 2023

ACS Appl. Nano Mater.

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Discovering sources of transition metals, such as Ni, Co, and Mn, has become crucial due to their broad applicability, particularly as electrocatalysts for the oxygen evolution reaction (OER). Upcycled spent batteries have emerged as alternatives for transition metal sources for the OER electrocatalysts. In this work, Ni−Co−Mn oxalates were extracted from the spent LiNi x Co y Mn z O 2 (NCM) cathode of lithium-ion batteries. The extracted oxalates were further processed via ball milling as a rapid and scalable mechanochemical route to engineer their structures. After calcination, Ni−Co−Mn oxides with nanosized granules on the surface that mainly consist of MnCo 2 O 4 were obtained. With a correlation of morphology and trimetallic oxide formation with the OER catalytic performance, Ni−Co−Mn oxides exhibit OER overpotentials of 367 and 732 mV in alkaline and neutral media, respectively, showing OER catalytic activity in a wide pH range. The results indicate that ball milling can induce particle size reduction and bond formation between metals to facilitate mixedmetal oxide formation. Furthermore, the resulting material is also applicable as the catalyst in the air cathode of Zn-air batteries, where the battery achieved a power density of 85.42 mW cm −2 and 100 h of cycling stability, showing comparability with a battery with a Pt/C−Ir/C catalyst.

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Section: Resultsmentioning

confidence: 76%

Section: Methodsmentioning

confidence: 96%

Nanostructured Ball-Milled Ni–Co–Mn Oxides from Spent Li-Ion Batteries as Electrocatalysts for Oxygen Evolution Reaction

Balqis

Irmawati

Geng

et al. 2023

ACS Appl. Nano Mater.

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“…These results indicate that the metal coupling with Co(OH) 2 does not increase the electrochemical‐specific surface area, so the OER enhancement is mostly attributed to the improvement of the intrinsic activity. According to the literature, [51] we have also calculated the turnover frequency (TOF) of the different catalysts at an overpotential of 300 mV. The detailed calculation is given in the supporting information.…”

Section: Resultsmentioning

confidence: 99%

Effects of Group IB Metals of Au/Ag/Cu on Boosting Oxygen Evolution Reaction of Cobalt Hydroxide

et al. 2023

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Developing high‐activity, good‐stability oxygen evolution reaction (OER) catalysts is the key to solving the problem of hydrogen production from electrolytic water. Cobalt hydroxide (Co(OH)2) is a hopeful OER catalyst, but its poor conductivity and low inherent activity limit its OER performance. Herein, we used group IB metals of Au, Ag, and Cu to increase the OER performance of Co(OH)2 via the electrodeposition method. All three metals can increase the carrier concentration and proportion of high‐valence cobalt ions. The analysis results disclose that the construction of Ag−Co(OH)2 heterostructure can optimize the electronic structure through interfacial interactions, produce a moderate proportion of high‐valence cobalt centers, enhance the charge transport capacity and the adsorption of hydroxyl species, thus accelerating the OER kinetics and effectively improving the inherent catalytic activity. This work not only develops effective and steady catalysts but also provides a facile method to enhance the OER performance through interface engineering.

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“…Mohamed et al 55 recently reported similar XPS results along with other previous literature reports. 56,57 The signals at 229.2 and 232.8 eV are attributed to Mo 3d 5/2 and Mo 3d 3/2 , respectively, confirming the prominent presence of Mo 4+ as MoS 2 in the hybrid catalyst. 58 The appearance of another peak at 235.6 eV along with the 232.8 eV peak probably suggests the presence of Mo 6+ (existence of the Mo−O bond) along with Mo 4+ of MoS 2 in the hybrid catalyst, respectively.…”

Section: Characterizationsmentioning

confidence: 96%

Plasmon–Exciton Coupling-Assisted Efficient Overall Water Splitting in Alkaline Medium Using a Plexcitonic NiO/Ni Foam Catalyst

Ansilda,

Chittilappilly Devassy,

Kamalakshan

et al. 2023

ACS Appl. Eng. Mater.

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The rational design of bifunctional catalysts for efficient water splitting in alkaline medium under photoelectrocatalytic conditions through the coupling of photoinduced electron transfer and surface catalytic reaction holds great promise for sustainable energy conversion. The hydrogen evolution reaction (HER) in alkaline medium is challenging due to the requirement of an additional low-barrier water dissociation step along with the favorable H-adsorption on the catalytic surface. The porous NiO/Ni foam structures provide active sites for water dissociation with a high oxygen evolution reaction (OER) activity. However, their HER activity is limited, presumably due to the lack of Hadsorption sites. Here, we demonstrate a simple strategy to develop a hybrid catalyst for both alkaline HER and OER by in situ coupling of plasmonic and excitonic Au−MoS 2 hybrid nanosheets with the NiO/Ni foam. The plasmon−exciton coupling in the Au−MoS 2 hybrid is known to significantly increase the number of favorable H-adsorption sites and improve effective charge separation at the interface. By combining the low-barrier water dissociation sites of the NiO/Ni foam and the optimal hydrogen adsorption sites of plexcitonic Au−MoS 2 hybrid nanosheets, our designed Au−MoS 2 /NiO/Ni foam hybrid catalyst exhibits much superior alkaline HER and OER performances with lower overpotentials compared to the Au/NiO/Ni, MoS 2 /NiO/Ni, and bare NiO/Ni foam catalysts under both electro-and photoelectrocatalytic conditions. The plasmonic excitation with white light irradiation significantly improves the overall water-splitting performance by strong plasmon−exciton couplingassisted efficient charge transfer in the Au−MoS 2 /NiO/Ni foam hybrid catalyst. This research provides a promising strategy to enhance the alkaline water electrolysis performance in photoelectrocatalytic conditions by engineering the coupling of photoinduced electron transfer and surface-active site reactions of hybrid catalysts.

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Facile synthesis of Ni/NiO nanocomposites: the effect of Ni content in NiO upon the oxygen evolution reaction within alkaline media

Abstract: We present the facile synthesis of Ni/NiO nanocomposites, via a solution combustion methodology, where the composition of metallic Ni within NiO is controlled by varying the annealing time, from 4 minutes up to 8 hours.

Cited by 51 publications

References 69 publications

Nanostructured Ball-Milled Ni–Co–Mn Oxides from Spent Li-Ion Batteries as Electrocatalysts for Oxygen Evolution Reaction

Nanostructured Ball-Milled Ni–Co–Mn Oxides from Spent Li-Ion Batteries as Electrocatalysts for Oxygen Evolution Reaction

Effects of Group IB Metals of Au/Ag/Cu on Boosting Oxygen Evolution Reaction of Cobalt Hydroxide

Plasmon–Exciton Coupling-Assisted Efficient Overall Water Splitting in Alkaline Medium Using a Plexcitonic NiO/Ni Foam Catalyst

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