Facile synthesis of mixed nickel-cobalt oxalates with composition control as high-performance electrode materials for supercapacitor

Modified Coprecipitation Synthesis of Nickel-Rich NMC (Li1.0Ni0.6Mn0.2Co0.2O2) for Lithium-Ion Batteries: A Simple, Cost-Effective, Environmentally Friendly Method

“…At this state, a solution of oxalic acid provides H + ions to decompose the carbonate radical of the precursor salt and releases a large amount of CO 2 gas. The transition metal ions (Ni, Mn, and Co) combine with C 2 O 4 2– radicals to form precipitates, while lithium ions still exist in a solvated state and are in charge balance with C 2 O 4 2– ions. − After perfectly mixing, the sample is heated at 100 °C until all water evaporates to form a solid mixture of lithium–nickel–manganese–cobalt oxalates (LiNiMnCo-ox) and an excess of oxalic acid. Step 4: The solid mixture obtained from “step 3” is calcinated at 850 °C for 10 h under an oxygen stream flowing in at a rate of 1 L min –1 .…”

Efficient Rhodamine B removal by photocatalysis using polyacrylonitrile/Ag2S nanofibers prepared by combining electrospinning technology and facile gas–solid reaction

“…In Figure 5d, the similar Nyquist plots of materials indicate the same equivalent circuit diagram of these materials. 33 The Nyquist plot of materials involved a depressed semicircle followed by a sloped line. As shown in Figure 5d, the PAN/Ag 2 S sample has a smaller Nyquist semicircle and lower charge transfer resistance (R s ) as compared to PAN nanofibers.…”

Enhanced Performance of Supercapacitors through Controlled Growth of Fe–Co–Ni Nanosheets

“…Efforts were made to improve the performance of supercapacitors by enhancing the reaction kinetics of electrode materials through methods such as surface engineering and atomic doping. − Transition metal oxides/hydroxides have shown promise as electrode materials owing to their large specific surface area, tunable synthesis process, and low cost. − Incorporating transition metals into these materials can have a synergistic effect on redox reactions, offering an effective pathway for enhancing the performance of supercapacitors. , Modification of the surfaces of transition metal oxides is a direct method for altering the electronic conductivity and reaction energy barriers, significantly impacting the energy storage and conversion ability of supercapacitors. − …”