CuO Nanosheets Prepared by Dielectric Barrier Discharge Microplasma as Catalysts for the Oxygen Evolution Reaction

Abstract

A method for constructing transition metal catalysts for the oxygen evolution reaction (OER) is proposed. Facile preparation is realized in the case of no added metal source via dielectric barrier discharge (DBD) microplasma under 10 min, and the thickness of the nanosheet is only 6.5 nm. The prepared ultrathin CuO nanosheets on copper foam (CuO UTNS/CF) display a catalytic activity of 262 mV overpotential (η) at 10 mA cm −2 for the OER in alkaline media. The asprepared electrocatalyst guarantees appealing long-term durability (>90 h) and a high turnover frequency (TOF) of 0.488 mol O 2 s −1 at 426 mV. Compared to CuO/CF prepared traditionally, the overpotential of CuO UTNS/CF can be directly reduced to 38 mV. Moreover, hydroxyl radicals ( • OH) were identified as the intermediate products and a possible synthesis mechanism was preliminarily put forward. As a facile technology for the OER catalyst, we believe that DBD microplasma will provide a broad perspective for researchers.

Deeply Reconstructed NiFe Layered Double Hydroxide Nanosheets for an Efficient Oxygen Evolution Reaction

“…Electrochemical water-splitting is critical to utilizing sustainable energy, yet its water oxidation half reaction, namely, the oxygen evolution reaction (OER), exhibits a sluggish kinetics due to the complex four-electron transfer process and the adsorption process of the diversified intermediates (*OH, *O, *OOH), which always needs a high overpotential to overcome the reaction energy barriers. , To date, NiFe layered double hydroxide (LDH) has shown promises in catalytic performances as a precursor of high-performance non-noble metal catalysts toward OER in the alkaline media . However, inadequate active sites exposed in traditional NiFe LDH materials and poor electrical conductivity still cause a high overpotential, hampering the utilization of NiFe LDH in practical applications. , Strategies including metal ion doping, anion intercalation, and modification of nonmetallic elements have been developed to improve their performances. , However, limited success has been achieved to combine the synergistic effects from increase in surface area and numbers of active sites in one simple synthesis demonstration, failing to achieve performances superior to the noble metal catalyst.…”

“…Electrochemical water-splitting is critical to utilizing sustainable energy, yet its water oxidation half reaction, namely, the oxygen evolution reaction (OER), exhibits a sluggish kinetics due to the complex four-electron transfer process and the adsorption process of the diversified intermediates (*OH, *O, *OOH), which always needs a high overpotential to overcome the reaction energy barriers. 1,2 To date, NiFe layered double hydroxide (LDH) has shown promises in catalytic performances as a precursor of high-performance non-noble metal catalysts toward OER in the alkaline media. 3 However, inadequate active sites exposed in traditional NiFe LDH materials and poor electrical conductivity still cause a high overpotential, hampering the utilization of NiFe LDH in practical applications.…”

Free‐Standing Multiscale Porous High Entropy NiFeCoZn Alloy as the Highly Active Bifunctional Electrocatalyst for Alkaline Water Splitting

“…Furthermore, the overpotentials of NiFeCoZn/NiZn‐Ni/NF‐24h are much lower than those of many recently reported non‐noble metal based OER catalysts (Table S2). [ 1,8,19,32‐33,38,49‐51 ]…”

“…Furthermore, the overpotentials of NiFeCoZn/NiZn-Ni/NF-24h are much lower than those of many recently reported non-noble metal based OER catalysts (Table S2). [1,8,19,[32][33]38,[49][50][51] As shown in Figure 6d, the EIS measurements are carried out to evaluate the mass transport ability of the samples in the oxygen evolution process. The NiFeCoZn/NiZn-Ni/NF-24h electrode possesses smaller equivalent resistance of 2.94 Ω than those of NiFeCoZn/NiZn-Ni/NF-12h (8.33 Ω), NiFeCoZn/NiZn-Ni/NF-48h (4.62 Ω), NiZn-Ni/NF (22.62 Ω), RuO 2 /NF (13.72 Ω), and NF (32.54 Ω).…”