Processing Rusty Metals into Versatile Prussian Blue for Sustainable Energy Storage

Abstract

To reach a closed-loop material system and meet the urgent requirement of sustainable energy storage technologies, it is essential to incorporate efficient waste management into designing new energy storage materials. Here, we reported a “two birds with one stone” strategy to transform rusty iron products into Prussian blue as high-performance cathode materials and recover the rusty iron products to their original status. Owing to the high crystalline and Na+ content, the rusty iron derived Prussian blue shows a high specific capacity of 145 mAh g− 1 and excellent cycling stability over 3500 cycles. Through the in situ X-ray diffraction and in situ Raman spectra, it is found that the impressive ion storage capability and stability are greatly related to the suppressed structure distortion during the charge/discharge process. The ions migration mechanism and possibility as universal host of other kinds of ions are further illuminated by density functional theory calculations. This work provides a new strategy for recycling wasted materials into high value-added materials for sustainable battery systems, and is adaptable in the nanomedicine, catalysis, sensors, and gas storage applications.

Efficient regeneration of retired LiFePO4 cathode by combining spontaneous and electrically driven processes

“…The discharge-specific capacity was131.1 mA h g −1 in the initial cycle, and it increased gradually in the next two circles due to the activation of the active substance. 41 To explore the effect of the applied current on the electrochemcial performacne of the regenerated LiFePO 4 , the cyclic properties of regenerated LiFePO 4 obtained from various applied currents (−1 mA, −2 mA, and −5 mA) were measured, as shown in Fig. 6c.…”

Electronic Tuning of Active Sites in Bifunctional Covalent Organic Frameworks for Photoassisted CO2 Electrocatalytic Full Reaction

“…For TTCOF-Co, it exhibits the highest FE CO value of 90.14 ± 1.80% at −0.7 V, which is much superior to that of TTCOF-Cu (<5%) and TTCOF-Ni (∼22%, −0.9 V) (Figures S26 and S27). To verify the carbon source of the reduction gas products, the isotopic-labeling experiment that uses 13 CO 2 as the substrate is conducted under identical reaction conditions and the products are analyzed by GC−MS. The peak at m/z = 29 is assigned to 13 CO, demonstrating that the carbon sources of reduction gas products come from the CO 2 conversion (Figure S28).…”

“…To verify the carbon source of the reduction gas products, the isotopic-labeling experiment that uses 13 CO 2 as the substrate is conducted under identical reaction conditions and the products are analyzed by GC−MS. The peak at m/z = 29 is assigned to 13 CO, demonstrating that the carbon sources of reduction gas products come from the CO 2 conversion (Figure S28). Blank carbon paper is tested at the cathode using the same test condition, and it shows no catalytic activity of CO 2 RR (Figure S29).…”

“…In this regard, it would be much desired to seek economy and energy benign treatment methods to rationally remove nitrophenol contaminants like 4-NP from wastewater and maximize resource utilization. 13,14 From the perspective of sustainable chemistry and carbon neutrality, the electrocatalytic carbon dioxide reduction reaction (CO 2 RR) is an emerging and promising green technology path that can use electrical energy to convert CO 2 into valuable fuels and fine chemicals (e.g., CO, CH 4 , HCOOH, C 2 H 4 , etc.). 15−21 However, the oxygen evolution reaction (OER) in the anode, counting ∼90% of the total energy of the system, has caused bottlenecks like high energy consumption or low overall energy conversion efficiency.…”

Effect of valence state of cobalt in cobalt hexacyanoferrate coprecipitated at different temperatures on electrochemical behavior

“…The structural parameters of the as-assembled CoHCF05 and CoHCF25 electrodes were initially estimated using the CoHCF powder mixed with the binder and conducting additive based on the Rietveld refinement with the rhombohedral structure (Table 3). [67][68][69] Sequentially, both parameters were measured in the charged and discharged states. The degree of the unit cell volume variation was compared with that in the previous state.…”