Premium
Dual‐Doping and Synergism toward High‐Performance Seawater Electrolysis
Author(s) -
Chang Jinfa,
Wang Guanzhi,
Yang Zhenzhong,
Li Boyang,
Wang Qi,
Kuliiev Ruslan,
Orlovskaya Nina,
Gu Meng,
Du Yingge,
Wang Guofeng,
Yang Yang
Publication year - 2021
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.202101425
Subject(s) - oxygen evolution , materials science , electrolysis , chemical engineering , dopant , inorganic chemistry , anode , electrolysis of water , water splitting , seawater , selenide , catalysis , doping , electrolyte , metallurgy , chemistry , electrode , electrochemistry , organic chemistry , optoelectronics , oceanography , photocatalysis , selenium , engineering , geology
Hydrogen (H 2 ) production from direct seawater electrolysis is an economically appealing yet fundamentally and technically challenging approach to harvest clean energy. The current seawater electrolysis technology is significantly hindered by the poor stability and low selectivity of the oxygen evolution reaction (OER) due to the competition with chlorine evolution reaction in practical application. Herein, iron and phosphor dual‐doped nickel selenide nanoporous films (Fe,P‐NiSe 2 NFs) are rationally designed as bifunctional catalysts for high‐efficiency direct seawater electrolysis. The doping of Fe cation increases the selectivity and Faraday efficiency (FE) of the OER. While the doping of P anions improves the electronic conductivity and prevents the dissolution of selenide by forming a passivation layer containing P–O species. The Fe‐dopant is identified as the primary active site for the hydrogen evolution reaction, and meanwhile, stimulates the adjacent Ni atoms as active centers for the OER. The experimental analyses and theoretical calculations provide an insightful understanding of the roles of dual‐dopants in boosting seawater electrolysis. As a result, a current density of 0.8 A cm −2 is archived at 1.8 V with high OER selectivity and long‐term stability for over 200 h, which surpasses the benchmarking platinum‐group‐metals‐free electrolyzers.