Continuous Conductive Networks Built by Prussian Blue Cubes and Mesoporous Carbon Lead to Enhanced Sodium-Ion Storage Performances

Abstract

The challenges of improving electrical conductivities and enhanced rapid dynamics are active research areas in the modification of Prussian blue (PB) and Prussian blue analogues (PBAs), which are used as excellent cathodes of sodium-ion batteries (SIBs). Herein, the terephthalic acid etched stepwise hollow bulky PB cubes and the intimate contact mesoporous carbon (CMK-3) particles with the adhered minisize PB cubes can together build continuous conductive networks. The composite (donated as N-PB@CMK) has high electrical conductivity, low resistance, and ultrahigh specific surface, which can lead to high capacitive contribution ratios. The N-PB@CMK electrode can deliver a discharge capacity of 120 mAh g–1 and maintain retention of 85.0% after cycling for 200 cycles at a current density of 100 mA g–1. Even cycling at 1 A g–1, the reversible capacity can be measured to 102 mAh g–1 and exhibit stability over a long cycle. In situ Raman spectroscopy and X-ray diffraction (XRD) patterns were further measured to illustrate the phase transition of crystal structure along with the extraction/insertion processes of Na+ ions. Especially, the assembled full cell with NaTi2(PO4)3@C anode can also show good stability and provide promising insights of applying the N-PB@CMK for energy storage systems in the future.

Ice-Assisted Synthesis of Highly Crystallized Prussian Blue Analogues for All-Climate and Long-Calendar-Life Sodium Ion Batteries

“…43 The weak peaks of the oxidation process at ∼4.0 V, which gradually disappeared, exhibit the formation of a solid electrolyte interphase (SEI). 43,44 Furthermore, W-PB showed poor cycling stability, given that the specific discharge capacity decreased to ∼50 mAh g −1 after 500 cycles at 150 mA g −1 , while I-PB could retain ∼90 mAh g −1 (Figure 2g). More importantly, I-PB shows a higher capacity retention of 64.9% over ∼3000 cycles at a high current density of 750 mA g −1 with Coulombic efficiency (CE) of ∼100% (Figure 2h), corresponding to a low capacity fading of 0.01% per cycle.…”

Unraveling the diffusion kinetics of honeycomb structured Na2Ni2TeO6 as a high-potential and stable electrode for sodium-ion batteries

“…17 In fact, many oxide materials have been explored as electrodes for SIBs including layered and polyanionic structures as well as Prussian blue having high theoretical capacity, and cycling stability, as well as high operating potentials. [18][19][20][21][22][23][24][25][26][27] However, in order to improve the electrochemical performance of SIBs for practical use in energy storage devices, one should focus on achieving high specic capacity and a high working potential simultaneously.…”

Antithrombotic Therapy by Regulating the ROS‐Mediated Thrombosis Microenvironment and Specific Nonpharmaceutical Thrombolysis Using Prussian Blue Nanodroplets

“…PB NPs formed a dark blue suspension (Figure S1, Supporting Information), and TEM imaging showed that the synthesized PB NPs were cubic particles ( Figure a). XRD analysis (Figure S2, Supporting Information) of PB NPs revealed characteristic peaks at 2θ = 17.45, 24.78, 35.33, 39.66, 43.63, 50.82, 54.15, and 57.34, which were assigned to the crystal faces (200), (220), (400), (420), (422), (440), (600), and (620) of the face‐centered cubic Fe 4 [Fe(CN) 6 ] 3 crystal (PDF# 73–0689), [ 38 ] which fully confirmed that we successfully synthesized PB NPs. PB‐PFP@PC was synthesized using the modified double‐emulsion method, in which PB NPs and PFP were encapsulated into the core‐shell structure of PLGA.…”