Self‐Supporting Iron‐Modified Nickel Phosphide Electrode Realizing Superior Bifunctional Performance for Water Splitting

Abstract

Utilizing non-noble metal-based materials to design highly active and low-cost bifunctional electrocatalysts play a vital role in oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) for the overall water splitting. Herein, a selfsupporting nickel phosphide electrode with the decoration of FeOOH species is successfully prepared by a simple electrodeposition and maceration drying process. This kind of electrode exhibits superior bifunctional activity for both HER and OER. Benefiting from the more exposed catalytic active sites, open hierarchical structure, and better reaction kinetics.At the current density of 100 mA cm À 2 , the optimal Ni 2 PÀ FeOOH/NF delivers the small overpotentials of 200 mV and 235 mV for HER and OER in an alkaline solution, respectively. After further assembling into the electrolyzer, the Ni 2 PÀ FeOOH/NF-based device shows a lower cell voltage of 1.5 V and 1.66 V to reach the current density of 10 mA cm À 2 and 100 mA cm À 2 , along with superior stability. This work outlines a promising strategy for the facile preparation of self-supporting electrodes for practical application in hydrogen generation by overall water splitting.

FeCo Alloy Nanoparticles on Porous Carbon for Zinc–Air Batteries

“…The charge transfer process was investigated by electrochemical impedance spectroscopy (EIS), as seen from the Nyquist plots in Figure e. FeCo/HP-NC displays the narrowest semicircle diameter and charge transfer resistance (5.13 Ω), which is close to RuO 2 (4.89 Ω) and less than those of other catalysts in Figure S19, demonstrating the faster charge transfer rate to realize better reaction kinetics in the OER process. − In summary, with improved ORR and OER performance, FeCo/HP-NC is an excellent ORR and OER bifunctional electrocatalyst.…”

The In Situ Construction of NiFeS on Stainless Steel Mesh as an Efficient Electrocatalyst for UOR

“…4,5 However, traditional water electrolysis faces challenges due to the relatively high overpotential (1.23 V) and slow reaction kinetics, involving a 4e-transfer during the anode OER process, resulting in high energy consumption. 6,7 The hybrid electrolysis method has emerged at a historic moment, employing a more favorable anodic oxidation reaction to replace the OER process. This aims to reduce the required voltage, produce a variety of valuable chemicals in practical applications, and achieve maximum yield.…”