Novel FeNi‐Based Nanowires Network Catalyst Involving Hydrophilic Channel for Oxygen Evolution Reaction
Novel FeNi‐Based Nanowires Network Catalyst Involving Hydrophilic Channel for Oxygen Evolution Reaction
复制标题
涉及亲水通道的新型 FeNi 纳米线网络催化剂用于析氧反应
作者：
Xianshu Qiao;Hongjun Kang;Yang Li;Kai Cui;Xin Jia;Xiaohong Wu;Wei Qin
开发新型、高效、低成本的具有特殊亲水通道的3DFeNi基析氧反应(OER)催化剂仍然是提高制氢效率的挑战。本文首次报道了一种新型的具有亲水通道的三维乙氧基取代FeNi草酸盐(ENWS-FeNi-C2O4)纳米线网络催化剂，该催化剂具有较低的过电势(10 mA/cm−时为215 mV)和较小的塔菲尔斜率(12/12−1时为54.5 mV)。OER催化机理表明，由于特殊的亲水通道，OER反应过程中的OH吸附步骤和O2气泡扩散步骤明显改善，乙氧基作为层间配体不仅扩大了层状FeNi(氧)氢氧化物真实活性物种的层间距，而且调节了其电子结构，促进了*OH键的形成，从而表现出优异的OER性能。本工作为制备新型高效、具有特殊三维结构的OER电催化剂提供了新的思路。
Developing 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 O2bubble 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 efficient OER electro‐catalysts with special 3D structures.