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1. Distribution and Cycling of Nickel and Nickel Isotopes in the Pacific Ocean

   https://doi.org/10.1029/2024GL111115  

   Bian, X; Yang, S‐C; Raad, R J; Odendahl, C E; Lanning, N T; Sieber, M; Huang, K‐F; Fitzsimmons, J N; Conway, T M; John, S G (August 2024, Geophysical Research Letters)

   Abstract Nickel stable isotopes (δ⁶⁰Ni) provide insight to Ni biogeochemistry in the modern and past oceans. Here, we present the first Pacific Ocean high‐resolution dissolved Ni concentration and δ⁶⁰Ni data, from the US GEOTRACES GP15 cruise. As in other ocean basins, increases in δ⁶⁰Ni toward the surface ocean are observed across the entire transect, reflecting preferential biological uptake of light Ni isotopes, however the observed magnitude of fractionation is larger in the tropical Pacific than the North Pacific Subtropical Gyre. Such surface ocean fractionation by phytoplankton should accumulate isotopically lighter Ni in the deep Pacific, yet we find that North Pacific deep ocean δ⁶⁰Ni is similar to previously reported values from the deep Atlantic. Finally, we find that seawater dissolved δ⁶⁰Ni in regions with hydrothermal input can be either higher or lower than background deep ocean δ⁶⁰Ni, depending on vent geochemistry and proximity. 

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2. Electrochemically engineered domain: nickel–hydroxide/nickel nitride composite for alkaline HER electrocatalysis

   https://doi.org/10.1039/D3TA06408E  

   Chukwuneke, Chikaodili E; Kawashima, Kenta; Li, Hao; Marquez, Raul A; Son, Yoon Jun; Smith, Lettie A; Celio, Hugo; Henkelman, Graeme; Mullins, C Buddie (January 2024, Journal of Materials Chemistry A)

   The impact ofin situelectrooxidation in a Ni₃N electrocatalyst on its hydrogen evolution activity and electrochemical stability was investigated in alkaline media. 

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3. Decarbonylative thioetherification by nickel catalysis using air- and moisture-stable nickel precatalysts

   Liu, Chengwei; Szostak, Michal (February 2018, Chemical communications)

   A general, highly selective method for decarbonylative thioetherification of aryl thioesters by C–S cleavage is reported. These reactions are promoted by a commercially-available, userfriendly, inexpensive, air- and moisture-stable nickel precatalyst. The process occurs with broad functional group tolerance, including free anilines, cyanides, ketones, halides and aryl esters, to efficiently generate thioethers using ubiquitous carboxylic acids as ultimate cross-coupling precursors (cf. conventional aryl halides or pseudohalides). Selectivity studies and site-selective orthogonal cross-coupling/thioetherification are described. This thioester activation/coupling has been highlighted in the expedient synthesis of biorelevant drug analogues. In light of the synthetic utility of thioethers and Ni(II) precatalysts, we anticipate that this user-friendly method will be of broad interest. 

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4. Interfacing nickel nitride and nickel boosts both electrocatalytic hydrogen evolution and oxidation reactions

   https://doi.org/10.1038/s41467-018-06728-7  

   Song, Fuzhan; Li, Wei; Yang, Jiaqi; Han, Guanqun; Liao, Peilin; Sun, Yujie (December 2018, Nature Communications)
5. Germanium‐Functionalized 3D Microporous, Nanostructured Nickel–Nickel Oxides for Application in Asymmetric Supercapacitors

   https://doi.org/10.1002/ente.202300360  

   Kr_Singh, Balwant; Das, Debabrata; Gonzalez, Cristina; Ramana, C V (October 2023, Energy Technology)

   Supercapacitors and batteries are essential for sustainable energy development. However, the bottleneck is the associated high cost, which limits bulk use of batteries and supercapacitors. In this context, realizing that the cost of energy‐storage device mainly depends on materials, synthesis processes/procedures, and device fabrication, an effort is made to rationally design and develop novel low‐cost electrode materials with enhanced electrochemical performance in asymmetric supercapacitors. Herein, surface functionalization approach is adopted to design low‐cost 3D mesoporous and nanostructured nickel–nickel oxide electrode materials using facile synthesis for application in supercapacitors. It is demonstrated that the 3D mesoporous Ni provides the high surface area and enhanced ionic conductivity, while germanium functionalization improves the electrical conductivity and reduces the charge‐transfer resistance of NiO. Surface functionalization with Ge demonstrates the significant improvement in specific capacitance of NiO. The asymmetric supercapacitor using these Ge‐functionalized NiO–Ni electrodes provides a specific capacitance of 304 Fg⁻¹(94 mF cm⁻²), energy density of 23.8 Wh kg⁻¹(7.35 μWh cm⁻²), and power density of 6.8 kW kg⁻¹(2.1 mW cm⁻²) with excellent cyclic stability of 92% after 10 000 cycles. To validate their practical applications, powering the digital watch using the asymmetric supercapacitors in laboratory conditions is demonstrated. 

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