Enhanced Water Oxidation Activity by Introducing Gallium into Cobalt‐Iron Oxide System

Abstract

Development of high‐efficiency and robust multi‐element transition metal oxides for oxygen evolution reaction (OER) is crucial to improve the energy efficiency of electrocatalytic water splitting. Here, we report a simple and efficient sol‐gel strategy to synthesize an amorphous ternary Fe−Co−Ga oxide composite with high OER activity, low Tafel slope, and good durability. The overpotential at 10 mA ⋅ cm−2 of the FeCoGaOx on glassy carbon, platinum, carbon paper, and nickel foam electrode is 245, 275, 237, and 215 mV, respectively, in an alkaline electrolyte. The addition of gallium into the FeCoOx system significantly promotes the charge transfer kinetics, thus improving the OER activity. This work affords a controllable method to vastly prepare cost‐effective and high‐efficiency multi‐metal water oxidation electrocatalysts.

Liquid Metal‐Based Organohydrogels for Wearable Flexible Electronics

“…[ 29,30 ] The peaks of Ga 2 O 3 and EGaInOH can also be observed in O 1s region. [ 31 ] These results indicate that EGaIn act not only as the catalyzer for the polymerization reaction but also as the cross‐linker for the prepared PAM chains, thus ensuring the formation of cross‐linked gel networks in LMIOs. Without the addition of EGaIn, the obtained products are still in liquid form instead of forming solid‐like organohydrogels, due to the lack of an efficient cross‐linking mechanism (Figure S6, Supporting Information).…”

Magnetic Field Enhancing the Electrocatalytic Oxygen Evolution Reaction of FeMn-Based Spinel Oxides

“…The signal peaks of C 1s, Mn 2p, Fe 2p, and O 1s were detected in the XPS full spectrum of Figure a, which is consistent with the elemental mapping (Figure S5). The two main peaks of the Fe 2p high-resolution spectrum (Figure c) are located at 711.66 eV (Fe 2p 3/2 ) and 724.13 eV (Fe 2p 1/2 ), which can be deconvoluted to 710.29 eV (Fe 2+ 2p 3/2 , in the spinel octahedron site, Oh), 712.33 eV (Fe 3+ 2p 3/2 , in the spinel octahedron site, Oh), 714.51 eV (Fe 3+ 2p 3/2 , in the spinel tetrahedron site, Td), 722.85 eV (Fe 2+ 2p 1/2 ), and 724.51 eV (Fe 3+ 2p 1/2 ), respectively. , In the detailed Mn 2p spectrum (Figure d), the prominent peaks at 642.39 and 653.97 eV correlate to Mn 2p 3/2 and Mn 2p 1/2 , respectively . By refined fitting, the Mn 2p 3/2 was deconvoluted into two peaks positioned at 642.28 and 644.9 eV, corresponding to Mn 2+ and Mn 3+ sites, respectively .…”

Observation of cluster spin glass behavior in thermally decomposed nanocrystalline Sn0.5Fe0.5O2−δ

“…Other than these peaks, a single peak at 716.3 eV also occurred in the spectrum which belongs to Sn(3p 3/2 ) 63,64 of the Sn 4+ state. In the Fe(2p) spectrum, the presence of Fe 3+ was confirmed due to the presence of peaks 65 at 713.5 eV and 726.6 eV due to (2p 3/2 ) and (2p 1/2 ) lines respectively, with a separation (2p 1/2 –2p 3/2 ) of 13.1 eV. A satellite peak 66 for Fe 3+ was also observed at 719.5 eV which appears highly intense due to association with the Sn 3p 3/2 peak (Fig.…”