Porous two-dimensional layerd molybdenum compounds coupled with N-doped carbon based electrocatalysts for hydrogen evolution reaction

Ru Nanoparticles Decorated on 2D MoO2 Nanosheets as Efficient and Durable Electrocatalysts for the Hydrogen Evolution Reaction in a Wide pH Range

“…The magnitude of intercepts at η = 0 refers to exchange current ( i 0 ); it is customary to divide exchange current ( i 0 ) by the area of the electrode (A) and the exchange current becomes exchange current density ( j 0 = i 0 /A). A high exchange current density ( j 0 ) is usually a good indication of being a good electrocatalyst for the target reaction. , From Figure d, it can be seen that 2D-MoO 2 /Ru 45 /NC exhibits the highest value of j 0 among all obtained catalysts, indicating the highest electron-transfer rate and best catalytic performance for HER. The high j 0 value for 2D-MoO 2 /Ru 45 /NC could be attributed to the unique Ru-supported nanostructure, which exposes abundant active sites in the catalytic process and illustrates that the content of Ru plays an important role in improving the electrocatalytic activities .…”

“…C 1s can be divided into three kinds of peaks including C–C, C–O, and C–N, demonstrating that the N atom is doped into the carbon matrix successfully (Figure S6a). For N 1s in Figure S6b, XPS spectrum of N 1s demonstrates that mainly pyridinc N exists in the prepared catalyst, whereas the weak peak at 395.5 eV can be ascribed to the Mo–N bond …”

“…No presence of MoO 3 or other molybdenum oxide is observed, indicating that MoO 3 can be reduced into single-phase MoO 2 with monoclinic symmetry by carbon at high temperature . Furthermore, Mo 2 C and MoC are formed at 600 °C, and metal Mo appeared when the temperature rises to 700 °C . Consequently, governed by a combination of the thermolysis carbon in the mixtures, , Mo­(VI) is changed into MoO 2 and Ru­(III) is reduced to metallic Ru.…”

“…46 Furthermore, Mo 2 C and MoC are formed at 600 °C, and metal Mo appeared when the temperature rises to 700 °C. 47 Consequently, governed by a combination of the thermolysis carbon in the mixtures, 48,49 Mo(VI) is changed into MoO 2 and Ru(III) is reduced to metallic Ru. 50 These Raman observable MoO 3 structures could be small clusters or oligomers of MoO 3 , which cannot be observed by XRD.…”

Promotion of Phenol Electro-oxidation by Oxygen Evolution Reaction on an Active Electrode for Efficient Pollution Control and Hydrogen Evolution

“…In contrast, in the Mo spectrum of CMO/NF, the Mo 3+ and Mo 4+ peaks are found, which may be caused by the reduction of Mo 6+ by H 2 . The presence of low valence states of Mo is reported to be beneficial for the HER performance for the promoted desorption of generated H 2 . , …”