Novel FeNi ‐Based Nanowires Network Catalyst Involving Hydrophilic Channel for Oxygen Evolution Reaction

The ethoxy substituted FeNi (oxy) hydroxide (ENWs-FeNi-OOH) nanowires network catalyst involving hydrophilic channels has a better affinity to electrolyte, which is conducive to increase the contact area between catalysts and electrolytes, significantly improving OH adsorption step. Meanwhile, based on the reduced energy barrier of rate-determining step the formation of OOH* intermediates in ENWs-FeNi-OOH catalyst can be promoted, exhibiting outstanding oxygen evolution reaction performance. AbstractDeveloping novel, efficient, and low-cost 3D FeNi-based oxygen evolution reaction (OER) catalysts with the special hydrophilic channel is still a challenge for improving hydrogen production efficiency. Herein, a novel 3D ethoxy substituted FeNi oxalate (ENWs-FeNi-C2O4) nanowires network catalyst with hydrophilic channels is reported firstly, which shows an outstanding OER activity with a low overpotential (215  mV at 10 mA cm−2) and small Tafel slope (54.5  mV dec−1). OER catalytic mechanism indicates that the OH adsorption step and O2 bubble diffusion step of OER reaction process can be significantly improved due to the special hydrophilic channels, and the ethoxy as an interlayer ligand not only expands the interlayer distance of layered FeNi (oxy) hydroxide true active species but modulates its electronic structure, promoting the *OOH formation step, and thus exhibiting the outstanding OER performance. This work provides a novel idea for the preparation of novel and ef...

Source: Small - January 7, 2022 Category: Nanotechnology Authors: Xianshu Qiao, Hongjun Kang, Yang Li, Kai Cui, Xin Jia, Xiaohong Wu, Wei Qin Tags: Research Article Source Type: research