Vertically Aligned FeOOH/NiFe Layered Double Hydroxides Electrode for Highly Efficient Oxygen Evolution Reaction

Abstract

Employing a low-cost and highly efficient electrocatalyst to replace Ir-based catalysts for oxygen evolution reaction (OER) has drawn increasing interest in renewable energy storage. In this work, a vertically aligned FeOOH/NiFe layered double hydroxides (LDHs) nanosheets supported on Ni foam (VA FeOOH/NiFe LDHs-NF) is prepared as a highly effective OER electrode in alkaline electrolyte. The VA FeOOH/NiFe LDHs-NF represents nanosheet arrays on nickel foam with some interspace among them. The vertically aligned and interlayer-structured architecture is binder-free and contributes to facile strain relaxation, relieving the exfoliation of the catalysts layer caused by the oxygen evolution process. The as-prepared electrode shows current densities of 10 and 500 mA cm −2 at overpotentials of 208 and 288 mV, and good stability in a half-cell electrolyzer. Besides, the alkaline polymer electrolyte water electrolyzer (APEWE) with this electrode showed 1.71 V at 200 mA cm −2 , and 2.041 V at 500 mA cm −2 , exhibiting the corresponding energy efficiency of 86.0% and 72.0% (based on the lower heating value of hydrogen), which is better than the typical commercial alkaline water electrolyzer.

Interface Electronic Coupling in Hierarchical FeLDH(FeCo)/Co(OH)2 Arrays for Efficient Electrocatalytic Oxygen Evolution

“…However, in this mutual doping method, it is hard to keep a balance between the catalytic activity and stability. On the other hand, hybrid and/or multi‐shell catalysts modified and combined with different materials have attracted increasing attention . Many hybrid catalysts, such as FeOOH/Co/FeOOH, Ag/Co(OH) 2 , NiFe 2 O 4 /NiFe layered double hydroxide (LDH), FeOOH/NiFe LDHs, Cu@NiFe LDH, and Am‐CFDH/NCNTs, have been prepared.…”

“…On the other hand, hybrid and/or multi‐shell catalysts modified and combined with different materials have attracted increasing attention . Many hybrid catalysts, such as FeOOH/Co/FeOOH, Ag/Co(OH) 2 , NiFe 2 O 4 /NiFe layered double hydroxide (LDH), FeOOH/NiFe LDHs, Cu@NiFe LDH, and Am‐CFDH/NCNTs, have been prepared. These hybrid catalysts modified by conductive metals or effective promotors always show enhanced electron transfer, reduced overpotential, and improved durability.…”

Active Site Identification and Evaluation Criteria of In Situ Grown CoTe and NiTe Nanoarrays for Hydrogen Evolution and Oxygen Evolution Reactions

“…In the recent years, significant progress has been made in the development of non‐precious metal‐based catalysts for OER and HER, including transitional metal (Fe, Co, Ni) ‐based oxide/hydroxides, layered double hydroxide for OER in alkaline medium and transitional metal sulfides, metal phosphides, metal carbides, metal nitrides for HER in all pH range. For example, CoSe 2 nanoparticles grown on carbon fiber paper and 3D Ni 1‐x Co x Se 2 mesoporous nanosheet networks on Ni foam have been reported as efficient electrocatalysts for HER in acidic or all pH conditions, while the vacancy‐rich ultrathin CoSe 2 nanosheets and CoSe 2 /N‐doped carbon composite were reported as efficient alkaline OER catalysts .…”

Recent Progress on Multimetal Oxide Catalysts for the Oxygen Evolution Reaction

“…[86][87][88][89][90][91][92][93][94][95][96][97][98][99][100][101] Various synthesis methods have been used to fabricate nanostructured catalysts such as electrodeposition, hydrothermal methods, and template synthesis. Jin and co-workers reported the sandwich-like coaxial structure of Ni@[Ni (2+/3+) Co 2 (OH) [6][7] x nanotubes for an OER catalyst electrode.…”