Ding Xiaoteng, Cui Wei, Zhu Xiaohua, Zhang Jianwei, Niu Yusheng
School of Tourism and Geography Sciences, College of Life Sciences, Qingdao University Qingdao 266071 China
Human Resources Department, Qingdao University Qingdao 266071 China.
RSC Adv. 2019 Dec 20;9(72):42470-42473. doi: 10.1039/c9ra06374a. eCollection 2019 Dec 18.
As the bottleneck of electrochemical overall water splitting, the oxygen evolution reaction (OER) needs efficient catalysts to lower the required overpotential. Electrocatalysts with an amorphous form are highly active but suffer with low structural stability. Poorly crystallized materials with activity like amorphous forms, while maintaining the mechanical robustness of crystalline forms, are expected to be ideal materials. Towards this direction, we, for the first time, developed low-crystalline FeO(OH)·4HO as an excellent OER electrocatalyst with an overpotential of 269 mV, in order to drive a current density of 100 mA cm in a 1.0 M KOH environment, and this outperforms most of the reported Fe-based electrocatalysts. Notably, its activity can be maintained for at least 100 hours. A one-pot synthesis for the poorly-crystallized material using one of the most abundant metal elements to obtain effective OER catalysis will provide great convenience in practical applications.
作为电化学全水解的瓶颈，析氧反应（OER）需要高效催化剂来降低所需的过电位。非晶态形式的电催化剂具有高活性，但结构稳定性较差。具有类似非晶态活性的结晶度差的材料，在保持晶体形式机械强度的同时，有望成为理想材料。朝着这个方向，我们首次开发了低结晶度的FeO(OH)·4H₂O作为一种优异的OER电催化剂，在1.0 M KOH环境中驱动100 mA cm⁻²的电流密度时过电位为269 mV，这优于大多数已报道的铁基电催化剂。值得注意的是，其活性可保持至少100小时。使用最丰富的金属元素之一通过一锅法合成结晶度差的材料以获得有效的OER催化，将在实际应用中提供极大便利。
