Nickel nanoparticles modified MnO nanosheet arrays for high-performance supercapacitor with long-lasting and sustainable capacitance increase

Emerging two-dimensional nanostructured manganese-based materials for electrochemical energy storage: recent advances, mechanisms, challenges, and prospects

“…As a result, Ni-modied MnO nanosheet arrays exhibited an excellent high specic capacitance of 1235.6 F g −1 achieved at 0.5 A g −1 and a high rate capacity of 1075.6 F g −1 delivered at 10 A g −1 . 139 5.1.2. 2D MnO 2 .…”

Amorphous Ni–Mn–O microspheres with high energy density and ultralong-term stability up to 100, 000 cycles for aqueous pseudo-capacitors

“…S3 (b-f), distributions of Ni, Mn, O, K in NF-24@MnO 2 -C are as uniform as that of NF-24@MnO 2 -A. As shown in Table S2, compared with the performance of similar composite electrodes reported in recent years, NF-24@MnO 2 -A has excellent cycle stability and higher speci c capacity [24][25][26][27][28][29][30][31][32][33][34][35][36] . Therefore, the superior electrochemical stability and ability to withstand current uctuations originate from stable porous structure and amorphous phase of NiMn 1.57 O 4.13 microspheres.…”

“…8). The capacity retention is 106.1% after 100,000 cycles at 5 A g − 1 with a corresponding energy density of 122.8 Wh kg − 1 , which is superior to most reported SPCs as far as we know [7,8,12,15,[24][25][26][27][28][29][30][31][32][33][34][35][36] . The current density is transformed from 5 A g − 1 to 2 A g − 1 , 10 A g − 1 , 20 A g − 1 , and 50 A g − 1 in order to investigate the in uence of current-density uctuation on the SPC after the 3,000th cycle and the 100,000th cycle since the cyclic behaviors are stable after them.…”

High-performance asymmetric supercapacitor device with nickel–cobalt bimetallic sites encapsulated in multilayered nanotubes

“…37 Nickel-nanoparticle-modified MnO nanosheet arrays wherein Ni NPs promote the accumulation and release of electrons at the interface of Ni/MnO, which contributes extra capacitance to the composite, are similar to the case of C-ZIF-800 with porous electrochemically exposed active sites. 38 An asymmetric supercapacitor of Ni(OH) 2 /A/CNT in 6 M KOH within a 1.6 V window offers a maximum specific capacitance of 82.1 F g À1 with an energy density of 32.3 W h kg À1 at a power density of 504.8 W kg À1 . 39 The hierarchical structure in the combination of Ni and Ag nanoparticles on rGO offers a synergistic effect and retention of capacitance with supercapacitive performance.…”