Metal-organic frameworks (MOFs) find wide-ranging applications owing to their adjustable structures, diverse compositions, and large specific surface area. In this work, MOFs materials were grown in situ on carbon cloth, yielding self-supported electrodes V O -(Fe,Co) 3 O 4 @CC rich in oxygen vacancies through a simple high-temperature annealing treatment utilizing NaBH 4 as an etchant. Thus the resulting self-supported electrode V O -(Fe,Co) 3 O 4 @CC exhibited excellent oxygen evolution reaction (OER) performance, achieving an overpotential of merely 288 mV at 10 mA cm −2 , along with a low Tafel slope of 31.39 mV dec -1 , and demonstrating robust long-term activity and stability. In addition, a liquid zinc-air battery was assembled utilizing the prepared V O -(Fe,Co) 3 O 4 @CC as an air cathode, achieving a high open-circuit voltage of 1.46 V and a high peak power density of 89.06 mW cm −2 , and it maintained excellent cycling stability during cyclic charging and discharging (with a current density of 2 mA cm −2 ) over a 32 h period. Meanwhile, the self-supported electrode V O -(Fe,Co) 3 O 4 @CC served as an air cathode for assembling an all-solid-state flexible zinc-air battery (ZAB), demonstrating a high peak power density (38.21 mW cm −2 ) and exhibiting favorable cycling stability. This experiment offers insights into the potential application of MOF-derived electrocatalysts in water decomposition and zinc-air batteries.
Herein, Fe0.32Co0.68 binary metal nanoparticles synthesized at room-temperature were loaded onto a novel hierarchical flower-like γ-Al2O3@C composite, which improved the stability and dispersity of the Fe0.32Co0.68 nanoparticles. The freshly prepared Fe0.32Co0.68/γ-Al2O3@C displayed good adsorption of Orange II (100 mg L−1, 973.55 mg g−1). Subsequently, the used Fe0.32Co0.68/γ-Al2O3@C adsorbent (Fe–Co oxide/γ-Al2O3@C) was reused as a peroxymonosulfate (PMS) catalyst. Amazing results were obtained, which demonstrated that Fe–Co oxide/γ-Al2O3@C can highly efficiently decompose Orange II (60 mg L−1, 1 min; 90 mg L−1, 2 min, 120 mg L−1, 7 min and 150 mg L−1, 10 min) as a PMS catalyst. It also exhibited good general degradation of different organic pollutants and excellent reusability (98%, tenth cycle) due to the structural stabilities of γ-Al2O3@C. Further, an experiment was carried out to treat high concentrations of Orange II (200 mg L−1) with the Fe0.32Co0.68/γ-Al2O3@C nanocomposite. After adsorption, PMS was added, and 98% degradation occurred within 5 minutes. The combination of adsorption and PMS advanced oxidation techniques may be one of the effective ways to deal with high-concentration dye wastewater.
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