Synthesis of porous flower‐like Ni‐Co‐Mo‐S nanostructures on Ni foam for battery‐supercapacitor hybrid devices

Abstract

The synergistic effects of multiple components and unique nanostructures were contributed to prepare the high‐performance battery‐type electrode materials. In this work, Mo element was introduced to form the ternary transition metal oxides/hydroxides of Ni‐Co to improve conductivity, and then charge transfer was accelerated to enhance the capacity storage. After sulfidation, the electrical conductivity was further improved, and a porous flower‐like nanostructure was formed. Except for that, the composites of transition metal oxides/hydroxides and sulfides were formed via sulfidation. With the help of the synergistic effects of multiple components and a porous flower‐like nanostructure, more Faradic redox reactions occurred. Therefore, the as‐prepared porous flower‐like Ni‐Co‐Mo‐S nanostructures on Ni foam exhibited an excellent areal capacitance of 7.22 C·cm−2 at 5 mA·cm−2 and long‐cycle stability (96.9% retention after 5000 cycles). Furthermore, a coin‐type battery‐supercapacitor hybrid (BSH) device was assembled, which achieved 54.54 Wh·kg−1 at 540 W·kg−1 and displayed 74.8% capacitance retention after 3500 cycles. All mentioned above demonstrated that ternary transition metal oxides/hydroxides precursors via sulfidation can form special structures and the composites of transition metal oxides/hydroxides and sulfides to prepare high‐performance battery‐type electrodes for energy storage.

Green synthesis of nickel‐manganese/polyaniline‐based ternary composites for high‐performance supercapattery devices

“…Several metal oxides, hydroxides, and conducting polymers lie in the category of pseudocapacitive materials 4,9,10 . Compared to EDLCs, the pseudocapacitor demonstrates better energy storage performance and exhibits higher specific capacitance 11‐14 . The EDLCs also lack behind in practical applications due to their low specific energy (SE) 15‐17 .…”

“…are more interested for the reseacher due to its more abundance, lower price, environmental friendly, and high theoretical capacitance 33‐36 . Zhu et al utilized Ni‐Co‐Mo‐S‐based flower nanostructure to study their synergetic effect in a hybrid supercapacitor 13 . The device yields an excellent specific energy of 54.54 Wh kg −1 at specific power of 540 W kg −1 .…”

Insight on the Energy Storage Mechanism and Kinetic Dynamic of Manganese Oxide‐Based Aqueous Zinc‐Ion Batteries

“…What's more, as shown in Figure 14d, the redox potential of Zn is low (Zn/Zn 2+ ) and that of Mn is high (Mn 2+ /Mn); the theoretical specific capacities of Zn and Mn are excellent; both are also relatively cheap (Mn‐2000 USD/ton, Zn‐2600 USD/ton). [ 31 ] Even though the advantages of AZIB are significant, current research on Mn‐based AZIB is largely limited to low load levels. To accelerate the commercialization of AZIB, future research into higher loads will have to follow.…”

“…[ 23–30 ] Zn also has the characteristics of lower cost (Zn‐2600 USD/ton, Li‐130000 USD/ton, Na‐3000 USD/ton, K‐13000 USD/ton, Cu‐6510 USD/ton) which is the most critical step for AZIB to be applied in practice. [ 31 ] In addition, zinc metal anodes can be used directly in water electrolytes, whereas Li, Na, and K metal anodes require organic electrolytes. The smaller ionic radius of Zn 2+ than other metals (Li + −0.76 Å, Na + −1.02 Å, K + −1.38 Å) also provides the possibility for more Zn 2+ to be inserted and extracted in the cathode, which is the key step to improving the energy density.…”

Preparation of Bush-Like Ru/NiO-Ni Foam Catalyst and Its Performance in Hydrogen Production from Sodium Borohydride Alcoholysis

“…Bulk carrier is generally preferred over powder carrier because it terminates the hydrogen production within the required time. A popular catalyst carrier is Ni foam, which possesses a unique three-dimensional foam block structure, low density, high thermal stability, and large specific surface area. − The unique pore structure of Ni foam also assures the timely discharge of hydrogen generated by the NaBH 4 alcoholysis reaction, thereby increasing the flowability of reactants and products. In previous research, hydrogen production by NaBH 4 alcoholysis has been enhanced by depositing active components (Co–Zn, Co–Ni–P–B, Co–P, Fe–Co–B, and Co–W–B) on the surface of Ni foam. − …”