title: Vertically Aligned FeOOH/NiFe Layered Double Hydroxides Electrode for Highly Efficient Oxygen Evolution Reaction.
abstract: Employing a low-cost and highly efficient electrocatalyst to replace Ir-based catalysts for oxygen evolution reaction (OER) has drawn increasing interest in renewable energy storage. In this work, a vertically aligned FeOOH/NiFe layered double hydroxides (LDHs) nanosheets supported on Ni foam (VA FeOOH/NiFe LDHs-NF) is prepared as a highly effective OER electrode in alkaline electrolyte. The VA FeOOH/NiFe LDHs-NF represents nanosheet arrays on nickel foam with some interspace among them. The vertically aligned and interlayer-structured architecture is binder-free and contributes to facile strain relaxation, relieving the exfoliation of the catalysts layer caused by the oxygen evolution process. The as-prepared electrode shows current densities of 10 and 500 mA cm-2at overpotentials of 208 and 288 mV, and good stability in a half-cell electrolyzer. Besides, the alkaline polymer electrolyte water electrolyzer (APEWE) with this electrode showed 1.71 V at 200 mA cm-2, and 2.041 V at 500 mA cm-2, exhibiting the corresponding energy efficiency of 86.0% and 72.0% (based on the lower heating value of hydrogen), which is better than the typical commercial alkaline water electrolyzer.
authors.affiliation: Fuel Cell System and Engineering Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences , Dalian, 116023, P. R. China.|University of Chinese Academy of Sciences , Beijing, 100049, P. R. China.
authors.forename: Jun
authors.initials: J
authors.lastname: Chi
authors.affiliation: Fuel Cell System and Engineering Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences , Dalian, 116023, P. R. China.
authors.forename: Hongmei
authors.identifier: http://orcid.org/0000-0002-0258-7357
authors.initials: H
authors.lastname: Yu
authors.affiliation: Fuel Cell System and Engineering Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences , Dalian, 116023, P. R. China.|University of Chinese Academy of Sciences , Beijing, 100049, P. R. China.
authors.forename: Bowen
authors.initials: B
authors.lastname: Qin
authors.affiliation: Fuel Cell System and Engineering Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences , Dalian, 116023, P. R. China.|University of Chinese Academy of Sciences , Beijing, 100049, P. R. China.
authors.forename: Li
authors.initials: L
authors.lastname: Fu
authors.affiliation: Fuel Cell System and Engineering Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences , Dalian, 116023, P. R. China.|University of Chinese Academy of Sciences , Beijing, 100049, P. R. China.
authors.forename: Jia
authors.initials: J
authors.lastname: Jia
authors.affiliation: Fuel Cell System and Engineering Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences , Dalian, 116023, P. R. China.
authors.forename: Baolian
authors.initials: B
authors.lastname: Yi
authors.affiliation: Fuel Cell System and Engineering Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences , Dalian, 116023, P. R. China.
authors.forename: Zhigang
authors.initials: Z
authors.lastname: Shao
keywords: alkaline polymer electrolyte water electrolyzer; binder-free; layered double hydroxides; oxygen evolution reaction; water splitting