One-Step Electrodeposition of Nanostructured NiCoO_x Films for Highly Efficient Water Oxidation Reaction

Abstract

Nanostructured nickel-cobalt binary oxides (hydroxides) with efficient water oxidation activity are favorable for water electrolysis. Herein, we successfully developed a simple and fast anodic electrodeposition route to fabricate amorphous NiCoOx films on indium tin oxide (ITO) substrate. The crystalline structure, surface morphology, and surface composition of deposited films were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS), respectively. The optimized NiCoOx provided a synergistic effect for efficient water oxidation, with an overpotential of 250 mV and a low Tafel slope of 48 mV · dec-1. The NiCoOx films also exhibited an enhanced long-term durability.

Promoting Plasmonic Hot Hole Extraction and Photothermal Effect for the Oxygen Evolution Reactions

“…04-5510784 Au), where strong diffraction peaks at Bragg angles of 38.1°, 44.4°, 64.5°a nd 77.5°are corresponding to (111), ( 200), ( 220) and (311) of faciocentral cubic microcrystals of Au. There are no relative diffraction peaks of NiCoO x , which means that NiCoO x synthesized by photoelectrochemical deposition may exist in an amorphous state [14] . The XPS survey spectra of NiCoO x /Au electrode are shown in Figure S2, which are consistent with the recent report.…”

Pd‐Ni/Cd loaded PPy/Ti composite electrode: Synthesis, characterization, and application for hydrogen storage

“…The Ni 2p3/2 spectra (Figure E) exhibit a peak at 854.8 eV dominated by Ni (OH) 2. The peaks observed at 871.8 eV (Ni 2p5/2) correspond to the Ni (II) oxidation state . The significant amount of Ni (II) species existing in the Pd 36 ‐Ni 7 /Cd 57 /PPy/Ti electrode indicates that electron transfer likely occurs from the Ni atoms to the Pd atoms.…”

“…49 The peaks observed at 871.8 eV (Ni 2p5/2) correspond to the Ni (II) oxidation state. 50 The significant amount of Ni (II) species existing in the Pd 36 -Ni 7 /Cd 57 /PPy/Ti electrode indicates that electron transfer likely occurs from the Ni atoms to the Pd atoms. The surface oxidation during the sample preparation process for the XPS measurements may have also resulted in the existence of the Ni (II) oxidation state.…”