All‐Solid‐State Rechargeable Air Batteries Using Dihydroxybenzoquinone and Its Polymer as the Negative Electrode

Abstract

A proof‐of‐concept study was conducted on an all‐solid‐state rechargeable air battery (SSAB) using redox‐active 2,5‐dihydroxy‐1,4‐benzoquinone (DHBQ) and its polymer (PDBM) and a proton‐conductive polymer (Nafion). DHBQ functioned well in the redox reaction with the solid Nafion ionomer at 0.47 and 0.57 V vs. RHE, similar to that in acid aqueous solution. The resulting air battery exhibited an open circuit voltage of 0.80 V and a discharge capacity of 29.7 mAh gDHBQ−1 at a constant current density (1 mA cm−2). With PDBM, the discharge capacity was much higher, 176.1 mAh gPDBM−1, because of the improved utilization of the redox‐active moieties. In the rate characteristics of the SSAB‐PDBM, the coulombic efficiency was 84 % at 4 C, which decreased to 66 % at 101 C. In a charge/discharge cycle test, the capacity remaining after 30 cycles was 44 %, which was able to be significantly improved, to 78 %, by tuning the Nafion composition in the negative electrode.

Mn Single-Atom Tuning Fe-N-C Catalyst Enables Highly Efficient and Durable Oxygen Electrocatalysis and Zinc–Air Batteries

“…As shown in Raman spectra (Figure S3a in the Supporting Information), the prepared samples show Dband (1348 cm −1 ) and G-band (1584 cm −1 ) peaks belonging to disordered carbon and ordered graphite carbon, respectively. 34,35 Mn 1 @Fe-N-C/CNTs possesses a larger I G :I D ratio (1.49), compared to that of Mn-N-C/CNTs (1.17) and Fe-N-C/CNTs (1.12), indicating the higher degree of graphitization (Figure S3b in the Supporting Information). This may originate from the formed carbon shell via catalytic graphitization by Fe nanoparticle during pyrolysis, which can be seen in the TEM results.…”

Ein Zweidimensionales Konjugiertes Poly(benzimidazobenzophenanthrolin) Leiter‐Covalent Organic Framework für schnelle Protonenspeicherung**

“…Bislang wurden hauptsächlich organische Moleküle (z. B. Chinon) [12][13][14][15] und anorganische Materialien (z. B. MoO3) [7,[16][17][18] als Protonenspeicher beschrieben.…”

Unleashing Ultrahigh Capacity and Lasting Stability: Aqueous Zinc‐Sulfur Batteries

“…[1,6] However, the intermittent nature of renewable energy sources has caused an urgency for the utilization of energy storage devices. [7][8][9] Currently, the commercial electronic market stands firmly under the dominion of lithium-ion batteries (LIBs), reigning as the unrivaled monarchs of energy storage. [10][11][12] Nevertheless, these batteries are bottlenecked by a few challenges viz.…”