English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Zendy Plus

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Zendy Tools

Zendy Open

We highlight 3D free-standing electrospun CNF electrodes as superior conductive scaffolds for the highly reversible proton-coupled MnIV(s) ↔ MnII(aq) conversion in a mild aqueous buffered electrolyte (pH 5). An electrochemical quartz crystal microbalance is used to in situ monitor these conversion reactions on the non-transparent CNF electrodes. Free-standing CNFs allow for a remarkably high relative MnO2 loading (63%, equivalent to an mMnO2/mCNF ratio of 1.7) at a maximal charge of 1.4 mA h cm−2, while keeping the C.E. ≥ 95% over 300 cycles. The gravimetric capacity of the complete cathode is thus as high as 338 mA h gMnO2+CNF−1 (i.e., 534 mA h gMnO2−1), outperforming the current state-of-the-art cathodes based on conventional graphite/carbon felts as substrates (<30% MnO2 loading, <0.4 mMnO2/mCNF ratio and <150 mA h gMnO2+substrate−1) or composite electrodes. Furthermore, the buffered electrolyte allows for remarkably highly constant deposition–dissolution potentials with a low hysteresis (0.16 V). Pairing 3D electrospun CNFs (diameter ≤ 200 nm) and mild aqueous buffered electrolytes is thus a striking approach towards the development of MnO2-based mild aqueous batteries with high energy efficiency.

journal of materials chemistry a

Towards a high MnO2 loading and gravimetric capacity from proton-coupled Mn4+/Mn2+ reactions using a 3D free-standing conducting scaffold