期刊
GREEN ENERGY & ENVIRONMENT
卷 6, 期 4, 页码 496-505出版社
KEAI PUBLISHING LTD
DOI: 10.1016/j.gee.2020.05.009
关键词
Water splitting; Oxygen evolution reaction; Hydrogen evolution reaction; Phosphides; Bifunctional electrodes
类别
资金
- National Natural Science Foundation of China [21878204]
- Key R&D program of Shanxi Province [201903D421073]
The novel FeP-Ni nanocone arrays assembled on 3D Ni foam demonstrated highly efficient electrocatalytic performance for overall water splitting. The unique 3D morphology of nanocone arrays played a crucial role in exposing more surface active sites, facilitating electrolyte diffusion, benefiting charge transfer, and promoting favorable bubble detachment behavior. This work provides a cost-effective pathway for designing and developing active self-supported electrodes with novel 3D morphology for water electrolysis.
The synthesis of low-cost and highly active electrodes for both oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) is very important for water splitting. In this work, the novel amorphous iron-nickel phosphide (FeP-Ni) nanocone arrays as efficient bifunctional electrodes for overall water splitting have been in-situ assembled on conductive three-dimensional (3D) Ni foam via a facile and mild liquid deposition process. It is found that the FeP-Ni electrode demonstrates highly efficient electrocatalytic performance toward overall water splitting. In 1 M KOH electrolyte, the optimal FeP-Ni electrode drives a current density of 10 mA cm(-2) at overpotential of 218 mV for the OER and 120 mV for the HER, and can attain such current density for 25 h without performance regression. Moreover, a two-electrode electrolyzer comprising the FeP-Ni electrodes can afford 10 mA cm(-2) electrolysis current at a low cell voltage of 1.62 V and maintain long-term stability, as well as superior to that of the coupled RuO2/NF parallel to Pt/C/NF cell. Detailed characterizations confirm that the excellent electrocatalytic performances for water splitting are attributed to the unique 3D morphology of nanocone arrays, which could expose more surface active sites, facilitate electrolyte diffusion, and benefit charge transfer and also favorable bubble detachment behavior. Our work presents a facile and cost-effective pathway to design and develop active self-supported electrodes with novel 3D morphology for water electrolysis. (C) 2020, Institute of Process Engineering, Chinese Academy of Sciences. Publishing services by Elsevier B.V. on behalf of KeAi Communications Co., Ltd.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据