A pH-universal ORR catalyst with single-atom iron sites derived from a double-layer MOF for superior flexible quasi-solid-state rechargeable Zn–air batteries

Abstract

Developing a highly efficient, easy-to-fabricate and non-noble metal electrocatalyst is vital for oxygen reduction reaction (ORR). Herein, we fabricate a single Fe sites catalyst Fe1/d-CN by developing a double-layer MOF...

Supramolecular Polymer Intertwined Free-Standing Bifunctional Membrane Catalysts for All-Temperature Flexible Zn–Air Batteries

“…However, the large overpotentials, inferior rate-capability, and unsustainable electrochemical stability during discharge–charge states over a wide temperature range due to the decelerated reaction kinetics of air cathodes and reduced ion conductivity of electrolytes remain the most critical challenges for practical applications [ 11 – 14 ]. Pt-, Ir/Ru-based materials are the present benchmark catalysts for oxygen reduction/evolution reactions (ORR/OER).…”

Theory‐Guided Regulation of FeN4Spin State by Neighboring Cu Atoms for Enhanced Oxygen Reduction Electrocatalysis in Flexible Metal–Air Batteries

“…Figure 4a shows the polarization curves of NCAG/Fe−Fe, NCAG/Fe−Cu, and commercial Pt/C (20 wt %) in O 2 ‐saturated 0.1 M KOH. Notably, both NCAG/Fe−Cu and NCAG/Fe−Fe exhibit a superb ORR activity with an onset potential ( E onset ) of +1.07 V and half‐wave potential ( E 1/2 ) of +0.94 V for the former and +1.04 V and +0.94 V for the latter (Figure 4b), both clearly outperforming commercial Pt/C (+0.99 V and +0.86 V) and leading transition metal‐based catalysts reported recently [47–53] . Additionally, the fact that NCAG/Fe−Cu displays a 100 mV positive shift of E 1/2 as compared to NCAG/Cu−Cu (Figure S27) indicates that the Fe centers rather than the Cu ones actually act as the active sites, and the remarkably high onset and half‐wave potentials of NCAG/Fe−Cu confirm the high intrinsic activity of the adjacent heteronuclear bimetal sites.…”

Compressible Zn–Air Batteries Based on Metal–Organic Frameworks Nanoflake‐Assembled Carbon Frameworks for Portable Motion and Temperature Monitors

“…It is worth noting that NiFe NF/NCFs‐based ZAB has advantages on OCP, peak power density, and specific capacity as compared with other recently reported works, as shown in Table S1, Supporting Information, and Figure 4e. [ 50–55 ] This remarkable FZAB performance was attributed to the superior catalytic activity of NiFe NF/NCFs and enlarged contact area to gel electrolyte that was endowed by well‐designed electrode–electrolyte interface. The electrode–electrolyte interfaces were further investigated by evaluating the force to separate the cathode and the gel electrolyte.…”