Fe−NiS Nanorod Encapsulated in Ce‐doped NiO_x Shell for Oxygen Evolution Reaction

Abstract

Rare earth (RE) elements are promising to improve the property of catalysts due to their distinctive 4 f electron orbital. Herein, a heterogeneous material of FeÀ NiS nanorods encapsulated in Ce-doped NiO x with 3D core-shell structure (FeÀ NiS@NiCeO x ) was constructed on carbon cloth (CC) through a straightforward solvothermal reaction and a subsequent electrodeposition for enhancing the electrocatalytic performance towards oxygen evolution reaction (OER) in alkaline medium. The strategy facilitates a synergy among the components, including an enlarged electrochemical active area of FeÀ NiS by the involvement of Fe and an ameliorated durability of FeÀ NiS nanorod by encapsulated in NiCeO x shell. Furthermore, a flexible valence alternation between Ce (III) and Ce (IV) speeds up the charges transfer between Ni(II) and Ni(III). In 1.0 mol L À 1 KOH, the FeÀ NiS@NiCeO x /CC electrode shows the lowest overpotential of 230 mV to achieve the current density of 50 mA cm À 2 , the smallest Tafel slope of 63 mV dec À 1 and a superior durability with only a potential fluctuation of 0.01 V on a chronopotentiometry curve within 24 h. Further research suggests that FeÀ NiS@NiCeO x /CC exhibits the best performance of the three as-fabricated FeÀ NiS@NiREO x /CC (RE = Ce, La, Pr) catalysts.

High-performance flexible thermoelectric devices with a copper foam heatsink for personal thermal management

“…1(d) and Table S1 (ESI †). 15,[28][29][30][31][32][33][34][35][36][37][38][39] Our work has demonstrated high performance in power generation. Moreover, the normalized power density, which is used to evaluate the inherent power generation ability of the power density divided by DT 2 by excluding the dependency of DT, is obtained as 3.60 mW cm À2 K À2 .…”

Composition‐Dependent NiS‐Enriched FeNi2S4/ZnCr2O4 Catalyst for Electrochemical Oxygen Evolution Reaction

“…[3][4] Examples are water-splitting devices [5][6] and rechargeable metal-air batteries. [7][8] The basic reactions are the same, even if these devices are constructed differently. [9] The hydrogen evolution reaction (HER) at the cathode electrode and the oxygen evolution reaction (OER) at the anode is involved in a water-splitting device, [10][11][12][13][14] while metal dissolution and deposition take place at the negative (metal) electrode and the oxygen reduction reaction (ORR) and OER at the positive electrodes are involved in a rechargeable metal-air battery.…”

“…Therefore, development of novel energy conversion and storage technologies is essential [3–4] . Examples are water‐splitting devices [5–6] and rechargeable metal‐air batteries [7–8] . The basic reactions are the same, even if these devices are constructed differently [9] .…”