Cu²⁺-Guided Construction of the Amorphous CoMoO₃/Cu Nanocomposite for Highly Efficient Water Electrolysis

Abstract

Designing highly efficient and durable electrocatalysts for overall water splitting is of great importance for the sustainable generation of high purity hydrogen. Herein, an amorphous CoMoO3/Cu (a-CoMoO3/Cu) electrode was designed and fabricated through a facile Cu2+-guided electrodeposition strategy. During the synthetic process, the formation of the Co3Mo alloy was suppressed, and the precipitation of a-CoMoO3 was accelerated due to the easily reduced feature of Cu2+. Moreover, metallic Cu can also endow the a-CoMoO3/Cu nanocomposite with remarkably high electron transfer rates. Benefitting from the synergetic effect between Cu and a-CoMoO3 and the high activity of a-CoMoO3, the as-prepared nanocomposite exhibits excellent water electrolysis performance with a low cell voltage of 1.50 V at 10 mA cm–2, which is superior to that of the Pt/C||Ir/C pair. Such prominent performance can be attributed to the abundance of active sites, as well as the optimal adsorption/desorption energy of the intermedia. DFT calculations demonstrate a-CoMoO3 as the real active site for hydrogen adsorption/desorption and the vital role of Cu in the enhanced water adsorption. The outstanding electrochemical activity and durability of the a-CoMoO3/Cu nanocomposite indicate its potential as a highly efficient water-splitting electrocatalyst.

Boosting Hydrogen Evolution through the Interface Effects of Amorphous NiMoO4–MoO2 and Crystalline Cu

“…To illustrate the crucial importance of the Ni–Mo–O component, SCN – poison measurements were conducted based on the poison effect of SCN – ions for oxidized metal species during the electrocatalytic process. , As shown in Figure S12, the ECSA for a/c Ni–Mo–O/Cu and Ni–Mo–O obviously decreased after introducing 0.1 M SCN – into the electrolyte, whereas it almost has no change for the Cu electrode under the same conditions. The aforementioned results suggest that SCN – indeed only poisons the oxidized metal species (Ni 2+ and Mo 4/6+ ), while having negligible influence on metallic sites (Cu 0 ).…”

Cationic Metal–Organic Framework-Based Mixed-Matrix Membranes for Fast Sensing and Removal of Cr2O72− Within Water

“…Metal–organic frameworks (MOFs), also known as the coordination polymer, are a promising class of porous materials constructed through the self-assembly of organic linkers and metal ions/clusters ( Cui et al, 2018 ; Esrafili et al, 2020 ; Hu et al, 2020 ; Cao et al, 2021 ; Lv et al, 2021 ; Wu et al, 2021 ). Due to the merits of large surface areas, tunable structures, and excellent stability, MOFs have been widely employed in various applications, such as gas storage and separation, sensing, catalysis, and biomedicine ( Wang et al, 2018 ; Zheng et al, 2018 ; Wu S. et al, 2020 ; Cheng et al, 2020 ; Hu E. et al, 2021 ; Hu M.-L. et al, 2021 ; Esrafili et al, 2021 ; Li et al, 2021 ; Zhou et al, 2021 ). Recently, several powder-form MOFs have been explored to remove and detect Cr 2 O 7 2− from aqueous water simultaneously ( Lin et al, 2017 ; Liu et al, 2019 ).…”

A Novel Zn (II)‐Based Metal‐Organic Framework as a Highly Selective and Sensitive Luminescent Sensor for the Detection of Nitrofuran Antibiotics

“…In recent years, as a microporous hybrid inorganic-organic crystalline material, metal-organic frameworks have become a research hotspot. [3] Due to the large surface area, ultra-high porosity, adjustable structure and function, MOFs are widely used in luminescent sensing/recognition, [4] adsorption and separation, [5] biochemistry, [6] catalysis, [7] etc. In addition, the luminous sensors based on MOFs are particularly impressive because of their tailorable fluorescent emission and high sensitivity.…”