Thin Copper-Based Film for Efficient Electrochemical Hydrogen Production from Neutral Aqueous Solutions

Abstract

Here, we report a water-soluble copper(II) complex acting as a hydrogen evolution catalyst in a neutral aqueous solution, which could be further developed to form water reduction material through electrodeposition. The material with extremely low loading of 33 μg Cu cm −2 showed impressive TON value of 5876 and TOF of 734 h −1 in 8 h CPE experiment in a neutral phosphate buffer solution. In X-ray photoelectron spectroscopy (XPS), the high-resolution C 1s peak is corresponding to a CC bond at 284.8 eV, C−N bond at 285.6 eV, C−O bond at 286.4 eV, and two different types of nitrogen configurations at around 398.5 and 399.9 eV are ascribed to pyridinic CN and tertiary amine C−N bonds, respectively, which implies that the ligand might be incorporated into the copper active material. It is assumed that the presence of the ligand has an influence on the activity and stability of the deposit.

Synthesis of Magnetic Ferrocene-Containing Polymer with Photothermal Effects for Rapid Degradation of Methylene Blue

“…The C 1s peak in the spectra of the resulting polymer shows the four components at the binding energies of 284.6, 285.1, 286.3, 287.3, and 290.4 eV, which was due to the functional groups of C-C/C-H, C=C, C-N, C=N, and C=O [ 17 , 18 , 19 , 20 , 21 ], respectively. In addition, the peaks at 398.6, 399.7, and 402.8 eV were related to the chemical environments of C=N, C-N, and N-H [ 22 , 23 , 24 ], respectively. The peak of O 1s centered at 532.1 eV corresponded to the C=O group [ 25 ].…”

Copper Metallopolymer Catalyst for the Electrocatalytic Hydrogen Evolution Reaction (HER)

“…The high activity of the reported Cu 2 MoS 4 electrocatalyst, which mimics the active sites of the molybdenum CO-dehydrogenase, is associated with two possible intermediate states facilitating spontaneous H 2 evolution during the one-electron-reduction. However, the onset potential of P OS [Cu] for the H 2 production is comparable to transition metal sulfide [44] and phosphide [45] catalysts, but is lower than the reduction potentials of protons obtained at, i.e., metal-free electrocatalysts [46], transition metals on carbon materials such as NiWS/CF [47] and Ni2P/CNS [48], or molecular catalysts [49,50,51]. To obtain a current density of 10 mA/cm 2 , the P OS [Cu] and the blank Pt electrodes require an overpotential of 760 mV vs. RHE (Figure 5a) in neutral media, both.…”

Carboxyl-Rich Carbon Dots as Highly Selective and Sensitive Fluorescent Sensor for Detection of Fe3+ in Water and Lactoferrin

“…X-ray photoelectron spectra were measured to further reveal the composition of COOH-CDs (Figure 2). The three peaks of C 1s at 288.8, 286.4, and 284.4 eV corresponded to -C=O, C-O-C, and C-C, respectively [28][29][30]. The three peaks in the O 1s spectrum can be attributed to C-O (533.08 eV), C-O-C/C-OH (532.37 eV), and C=O (531.6 eV) [31,32].…”