Fe3O4 doped double-shelled hollow carbon spheres with hierarchical pore network for durable high-performance supercapacitor

Tuning Confined Nanospace for Preparation of N‐doped Hollow Carbon Spheres for High Performance Supercapacitors

“…Figure d displays the Ragone plots for N‐HCS‐O as calculated from the GCD measurements in the symmetric supercapacitor. It is worth noting that the N‐HCS‐O presents a much higher energy density than many carbon‐based materials reported previously …”

MnO2@Fe3O4 Magnetic Nanoparticles as Efficient and Recyclable Heterogeneous Catalyst for Benzylic sp3 C−H Oxidation

“…Moreover, the Fe spectrum is depicted in Figure b, and two dominant peaks located at 711.0 and 724.23 eV are in good accordance with Fe 2p 3/2 and Fe 2p 1/2 spin orbit peaks along with other peaks which are consistent with the standard Fe 3 O 4 XPS spectrum in which Fe is present in the form of Fe 2+ and Fe 3+ . For the O1s XPS spectrum (Figure c), the spectrum contains three main peaks located at 530.09, 530.70, and 531.98 eV . The XPS results for used MnO 2 @Fe 3 O 4 MNP is in ESI.…”

Utilizing Waste Thermocol Sheets and Rusted Iron Wires to Fabricate Carbon–Fe3O4 Nanocomposite‐Based Supercapacitors: Turning Wastes into Value‐Added Materials

“…The Nyquistp lot ( Figure S11i Ni(OH) 2 /CNT than those of the other two devices;this indicates better capacitive properties. [46] The cyclic stability of the CÀFe 3 O 4 k Ni(OH) 2 /CNT device was performed at ah igh current density of 8Ag À1 over 10 000 cycles (Figure 5g). Energy density and power density are two key factors for SC devices.T he corresponding Ragone plots for the three ASC devices are shown in Figure 5f.I mpressively,t he CÀ Fe 3 O 4 k Ni(OH) 2 /CNT device delivers au ltrahigh energy density of 91.1 Wh kg À1 at ap owerd ensity of 0.8 kW kg À1 within the voltage window of 1.6 V, and still maintains an energy density of 55 Wh kg À1 ,e ven at av ery high powerd ensity of 8.0 kW kg À1 .T hese results are much higher than those of similar ASCs reported recently,s uch as reduced graphene oxide (rGO)/Fe 3 O 4 k NiCo 2 O 4 (44.89 Wh kg h À1 at 0.80 kW kg À1 ), [42] Fe 3 O 4 @C k C( 18.3 Wh kg À1 at 0.35 kW kg À1 ), [33] Fe 2 O 3 /rGO/ Fe 3 O 4 k Ni(OH) 2 (4.1 Wh kg À1 at 0.66 kW kg À1 ), [43] Fe 3 O 4 k NiCoS (89 Wh kg À1 at 1.1 kW kg À1 ), [44] Fe 3 O 4 @Fe 2 O 3 k Fe 3 O 4 @MnO 2 (26.6 Wh kg À1 ), [45] CÀCÀFe 3 O 4 k AC (17 Wh kg À1 at 0.4 kW kg À1 ).…”

“…Energy density and power density are two key factors for SC devices.T he corresponding Ragone plots for the three ASC devices are shown in Figure 5f.I mpressively,t he CÀ Fe 3 O 4 k Ni(OH) 2 /CNT device delivers au ltrahigh energy density of 91.1 Wh kg À1 at ap owerd ensity of 0.8 kW kg À1 within the voltage window of 1.6 V, and still maintains an energy density of 55 Wh kg À1 ,e ven at av ery high powerd ensity of 8.0 kW kg À1 .T hese results are much higher than those of similar ASCs reported recently,s uch as reduced graphene oxide (rGO)/Fe 3 O 4 k NiCo 2 O 4 (44.89 Wh kg h À1 at 0.80 kW kg À1 ), [42] Fe 3 O 4 @C k C( 18.3 Wh kg À1 at 0.35 kW kg À1 ), [33] Fe 2 O 3 /rGO/ Fe 3 O 4 k Ni(OH) 2 (4.1 Wh kg À1 at 0.66 kW kg À1 ), [43] Fe 3 O 4 k NiCoS (89 Wh kg À1 at 1.1 kW kg À1 ), [44] Fe 3 O 4 @Fe 2 O 3 k Fe 3 O 4 @MnO 2 (26.6 Wh kg À1 ), [45] CÀCÀFe 3 O 4 k AC (17 Wh kg À1 at 0.4 kW kg À1 ). [46] The cyclic stability of the CÀFe 3 O 4 k Ni(OH) 2 /CNT device was performed at ah igh current density of 8Ag À1 over 10 000 cycles (Figure 5g). After 10 000 cycles,t he device retains 98 %o fi ts initial capacitance, which indicates excellent cyclic stability.…”