Cu₃Mo₂O₉Nanosheet Array as a High-Efficiency Oxygen Evolution Electrode in Alkaline Solution

Abstract

Developing highly active and sustained oxygen evolution reaction (OER) catalysts for energy-saving electrolytic hydrogen generation is highly attractive. In this work, we report the development of a CuMoO nanosheet array on nickel foam (CuMoO/NF) as a highly active OER catalyst. Such CuMoO/NF shows high catalytic activity in 1.0 M KOH, passing 50 mA cm at an overpotential of 325 mV. It also shows superior long-term durability more than 24 h with a turnover frequency (TOF) of 0.09 mol O s at overpotential of 400 mV.

Promoting Oxygen Evolution Reaction of Co‐Based Catalysts (Co3O4, CoS, CoP, and CoN) through Photothermal Effect

“…Moreover, to further evaluate the accessibility of active sites, the electrochemical active surface areas (ECSAs) of different electrodes were estimated by extracting the electrochemical double‐layer capacitance ( C dl ) from the CV technique (Figure S3, Supporting Information) . As shown in Figure a, the calculated C dl value for Co 3 O 4 ‐5 (121.2 mF cm −2 ) is significantly higher than that of bare Co 3 O 4 electrode without NIR irradiation (77.3 mF cm −2 ).…”

Electronic Structure Tuning of 2D Metal (Hydr)oxides Nanosheets for Electrocatalysis

“…Gou et al reported that the Cu 3 Mo 2 O 9 nanosheet array on nickel foam (Cu 3 Mo 2 O 9 /NF) has a better OER performance (325 mV@50 mA cm −2 ) than Cu 3 Mo 2 O 9 powder/NF. [ 129 ] We assume that this thickness effect also worked here.…”

“…As a consequence, the decrease of the thickness of 2D materials can dramatically modify the surface electronic structure and thus enhance the electrocatalytic performances. [129] NiCo LDH nanosheets Morphology engineering/Thickness tailoring OER 1 m KOH 367 40 2015 [130] NiFe LDH ultrathin nanomesh Morphology engineering/Pore configuration OER 1 m KOH 268@50 mA cm −2 30 2018 [134] Porous…”

Nanostructured copper molybdates as promising bifunctional electrocatalysts for overall water splitting and CO2reduction

“…In addition, these numerical values are in good agreement with the results of Gou et al, who reported an overpotential of 0.325 mV at 50 mA cm À2 in 1.0 M KOH for Cu 3 Mo 2 O 9 nanosheet loaded on nickel foam. 90 The kinetics of OER at electrode interfaces were reected by their corresponding polarization curves. The linear curve tting gives the Tafel slopes of 46.9 and 79.9 mV dec À1 for, respectively, CuMoO 4 and Cu 3 Mo 2 O 9 , as illustrated in Fig.…”