title: High-Efficiency and Durable Water Oxidation under Mild pH Conditions: An Iron Phosphate-Borate Nanosheet Array as a Non-Noble-Metal Catalyst Electrode.
abstract: It is highly desired but still remains a key challenge to develop iron-based large-surface-area arrays as heterogeneous water oxidation catalysts that perform efficiently and durably under mild pH conditions for solar-to-hydrogen conversion. In this work, we report the in situ derivation of an iron phosphate-borate nanosheet array on carbon cloth (Fe-Pi-Bi/CC) from an iron phosphide nanosheet array via oxidative polarization in a potassium borate (KBi) solution. As a 3D catalyst electrode for water oxidation at mild pH, such a Fe-Pi-Bi/CC shows high activity and strong long-term electrochemical durability, and it only demands an overpotential of 434 mV to drive a geometrical catalytic current density of 10 mA cm-2with maintenance of its activity for at least 20 h in 0.1 M KBi. This study offers an attractive earth-abundant catalyst material in water-splitting devices toward the large-scale production of hydrogen fuels under benign conditions for application.
authors.forename: Weiyi
authors.initials: W
authors.lastname: Wang
authors.forename: Danni
authors.initials: D
authors.lastname: Liu
authors.forename: Shuai
authors.initials: S
authors.lastname: Hao
authors.affiliation: College of Chemistry and Chemical Engineering, Qufu Normal University , Qufu 273165, Shandong, China.
authors.forename: Fengli
authors.initials: F
authors.lastname: Qu
authors.affiliation: Analytical and Test Center, Southwest University of Science and Technology , Mianyang 621010, China.
authors.forename: Yongjun
authors.initials: Y
authors.lastname: Ma
authors.affiliation: Chengdu Institute of Geology and Mineral Resources , Chengdu 610064, China.
authors.forename: Gu
authors.initials: G
authors.lastname: Du
authors.affiliation: Chemistry Department, King Abdulaziz University , Jeddah 21589, Saudi Arabia.
authors.forename: Abdullah M
authors.initials: AM
authors.lastname: Asiri
authors.forename: Yadong
authors.initials: Y
authors.lastname: Yao
authors.forename: Xuping
authors.identifier: http://orcid.org/0000-0001-5034-1135
authors.initials: X
authors.lastname: Sun