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1. Uncovering the Influence of Ni ²⁺ Doping in Lead-Halide Perovskite Nanocrystals Using Optically Detected Magnetic Resonance Spectroscopy

   https://doi.org/10.1021/acs.chemmater.1c03822  

   Barak, Yahel; Meir, Itay; Dehnel, Joanna; Horani, Faris; Gamelin, Daniel R.; Shapiro, Arthur; Lifshitz, Efrat (February 2022, Chemistry of Materials)
2. Selective Capture of Ba ²⁺ , Ni ²⁺ , and Co ²⁺ by a Robust Layered Metal Sulfide

   https://doi.org/10.1021/acs.chemmater.9b04831  

   Gao, Yu-Jie; Sun, Hai-Yan; Li, Ji-Long; Qi, Xing-Hui; Du, Ke-Zhao; Liao, Yi-Yu; Huang, Xiao-Ying; Feng, Mei-Ling; Kanatzidis, Mercouri G. (March 2020, Chemistry of Materials)
3. Ab initio determination of a simultaneous dual-ion charging mechanism for Ni _0.25 Mn _0.75 O ₂ through redox reactions of Ni ²⁺ /Ni ⁴⁺ and O ^2- /O ^-

   https://doi.org/10.1039/D2TA03938A  

   Shepard, Robert; Brennan, Scott; Juran, Taylor R; Young, Joshua; Smeu, Manuel (July 2022, Journal of Materials Chemistry A)

   Over recent years, great efforts have been made to push the limits of layered transition metal oxides for secondary battery cathodes. This is particularly true for overall capacity, which has reached a terminal theoretical value for many materials. One avenue for increasing this capacity during charging is the intercalation of anions post cation deintercalation. This work investigates the charging mechanism of the P3-Na0.5Ni0.25 Mn0.75O2 cathode material through cation (Na) deintercalation and anion (ClO4) intercalation by means of density functional theory. The calculations corroborate experimental findings of increased capacity (135 mAh g-1 to 180 mAh g-1) through the intercalation of anions. However, this work demonstrates that a process of simultaneous cation deintercalation/anion intercalation is the primary charging mechanism, with charge compensation reactions of Ni2+/Ni4+ and O2-/O- occurring within the cathode material. To elucidate this simultaneous process, a novel method for computationally determining anion voltage in which one must consider full electrolyte interactions is proposed. Based on the results, it is believed that a simultaneous cation deintercalation/anion intercalation mechanism provides one potential avenue for the discovery of the next generation of secondary batteries. 

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4. Betavoltaic cell based on Ni/β-Ga ₂ O ₃ and ⁶³ Ni source

   https://doi.org/10.1116/6.0001533  

   Yakimov, Eugene B.; Polyakov, Alexander Y.; Pearton, Stephen J. (January 2022, Journal of Vacuum Science & Technology A)
5. Probing the Ni ²⁺ ‐selective Response of Fluorescent Probe NiSensor‐1 with the NiCast Photocaged Complex ^{† ‡}

   https://doi.org/10.1111/php.13567  

   Hickey, Erin E.; Kennedy, Daniel P.; Gwizdala, Celina; Basa, Prem N.; Müller, Peter; MacDonald, John; Burdette, Shawn C. (December 2021, Photochemistry and Photobiology)

   Abstract CTEA (N,N‐bis[2‐(carboxylmethyl)thioethyl]amine) is a mixed donor ligand that has been incorporated into multiple fluorescent sensors such as NiSensor‐1 that was reported to be selective for Ni²⁺. Other metal ions such as Zn²⁺do not produce an emission response in aqueous solution. To investigate the coordination chemistry and selectivity of this receptor, we prepared NiCast, a photocage containing the CTEA receptor. Cast photocages undergo a photoreaction that decreases electron density on a metal‐bound aniline nitrogen atom, which shifts the binding equilibrium toward unbound metal ion. The unique selectivity of CTEA was examined by measuring the binding affinity of NiCast and the CTEA receptor for Ni²⁺, Zn²⁺, Cd²⁺and Cu²⁺under different conditions. In aqueous solution, Ni²⁺binds more strongly to the aniline nitrogen atom than Cd²⁺; however, in CH₃CN, the change in affinity virtually disappears. The crystal structure of [Cu(CTEA)], which exhibits a Jahn–Teller–distorted square pyramidal structure, was also analyzed to gain more insight into the underlying coordination chemistry. These studies suggest that the fluorescence selectivity of NiSensor‐1 in aqueous solution is due to a stronger interaction between the aniline nitrogen atom and Ni²⁺compared to other divalent metal ions except Cu²⁺. 

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