Ultrafast Two-Step Synthesis of S-Doped Fe/Ni (Oxy)Hydroxide/Ni Nanocone Arrays on Carbon Cloth and Stainless-Steel Substrates for Water-Splitting Applications

Abstract

Nonprecious and effective electrocatalyst development is an essential requirement for boosting water-splitting efficiency to obtain clean and sustainable fuels for future renewable energy demands. Herein, we reported an ultrafast and feasible strategy for constructing an S-doped bimetallic iron/nickel oxy­(hydroxide) (S-(Fe/Ni)­OOH) as a superior electrocatalyst for oxygen evolution reaction (OER). It is prepared by consequent electroplating of nickel nanocone arrays (NiNCAs) on carbon cloth (CC) and stainless-steel mesh (SSM) and then formation of S-(Fe/Ni)­OOH layers on them by ultrafast one-step oxidation solution-phase method in the solution of Fe3+ and sodium thiosulfate at room temperature. The derived composite material [S-(Fe/Ni)­OOH@NiNCAs on SSM and CC] exhibited high electrocatalytic activity toward OER as well as good durability. The electrochemical measurements demonstrate that S-(Fe/Ni)­OOH@NiNCAs-CC and S-(Fe/Ni)­OOH@NiNCAs-SSM can drive the benchmark current density of 10 mA cm–2 at low overpotentials of 248 and 245 mV and current density of 100 mA cm–2 at overpotentials of 327 and 312 mV with a Tafel slope of 77 and 65 mV dec–1, respectively. Their outstanding electrocatalytic performances are benefited from porous, highly exposed active sites, accelerated mass and electron transport, and synergistic effects. The prepared composite electrodes act better than most advanced priceless catalysts and noble commercial RuO2 catalysts. This work provides an effective and efficient approach to design porous architecture catalysts on a three-dimensional substrate (SSM and CC) with high performance for energy-relevant and electrocatalysis reactions.

Engineering Self‐Supported Hydrophobic–Aerophilic Air Cathode with CoS/Fe3S4 Nanoparticles Embedded in S, N Co‐Doped Carbon Plate Arrays for Long‐Life Rechargeable Zn–Air Batteries

“…Normalized roughness factor (RF) was further calculated, achieving 112 for CoS/Fe 3 S 4 @SNCP and 64 for CoS@SNCP. [46,47] Thus, the introduction of Fe 3 S 4 nanoparticles and the enhanced surface roughness synergistically results in the good hydrophobic property with the CoS/Fe 3 S 4 @SNCP electrode without using any hydrophobic polymer.…”

Coupling NiCoS and CoFeS Frame/Cagelike Hybrid as an Efficient Electrocatalyst for Oxygen Evolution Reaction

“…The electrochemical oxygen evolution reaction (OER), due to rate-limiting and multiple electron–proton transfer steps and kinetic limitations, plays a key role in these research areas. Therefore, seeking effective OER electrocatalysts is indispensable to reducing activation energies, speeding up the reaction, and eventually boosting the conversion efficiency. − …”

Electrolysis of Glycerol by Non-Noble Metal Hydroxides and Oxides

“…Similarly, a distinct peak is noted at 1.4 V from the CV curves of NiFeLDH owing to the formation of nickel (oxy)­hydroxide (NiOOH) . Comparatively, the potential of Ni 2+ /Ni 3+ in the NiFeLDH is different, which indicates that the formation potential of NiOOH species will be changed due to the presence of Fe. , Co­(OH) 2 and CoFeLDH have similar redox peaks, which is mainly attributed to the redox of Co II /Co III . Figure S6e shows the CV curve of NiO, in which the first anodic peak at about 1.0 V is related to the formation of β-Ni­(OH) 2 , while the appearance of the second anodic peak at more positive potentials is characteristic of the transformation of Ni 2+ to Ni 3+ .…”