Surface modulated Fe doping of β‐Ni(OH)2 nanosheets for highly promoted oxygen evolution electrocatalysis. Issue 6 (5th July 2022)

• Record Type: Journal Article
• Authors: Hu, Shuisheng; Li, Yong; Kim, Daekyu; Liu, Mengjie; Lee, Lawrence Yoon Suk; Wong, Kwok‐Yin
• Is Part Of: EcoMat. Volume 4:Issue 6(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-07-05
• Subjects: electrocatalysis -- high Fe doping -- in situ Raman spectroscopy -- nickel–iron hydroxide -- oxygen evolution reaction; Materials -- Environmental aspects -- Periodicals; Clean energy -- Periodicals; 621.042
• DOI: 10.1002/eom2.12256
• Languages: English
• ISSNs: 2567-3173

Abstract

Abstract: Active yet low‐cost electrocatalysts for water oxidation are crucial for the development of hydrogen energy economy. The Fe doping into Ni(OH)2 dramatically enhances catalytic activity toward oxygen evolution reaction (OER) but fabricating Ni(OH)2 of high Fe loading is still challenging. Herein, we report a one‐pot strategy to prepare disordered β‐Ni(OH)2 nanosheets with a high Fe doping level (9.9 at%, D‐Fe‐Ni(OH)2 ). By engaging 1, 4‐phenylenediphosphonic acid (BDPA), Fex BDPAy precursors are in situ generated in a growth solution containing Fe 3+ ions, which decrease the reaction kinetics of Ni 2+ and Fe 3+ ions at the surface of Ni foam. This prevents the deconstructive hydrolysis by Fe 3+ ions and enables a high Fe‐doping in D‐Fe‐Ni(OH)2 . The as‐prepared D‐Fe‐Ni(OH)2 affords 10 mA cm −2 at an ultralow OER overpotential of 194 mV in alkaline media. This work offers a promising strategy of engaging organic ligands to achieve high‐doping levels for the construction of efficient electrocatalysts. Abstract : By engaging 1, 4‐phenylenediphosphonic acid (BDPA), disordered β‐Ni(OH)2 nanosheets with a high Fe doping level (9.9 at%, D‐Fe‐Ni(OH)2 ) is prepared. In situ generated Fex BDPAy precursors decrease the reaction kinetics of Ni 2+ and Fe 3+ and prevent the deconstructive hydrolysis by Fe 3+, enabling high Fe‐doping in D‐Fe‐Ni(OH)2 that affords 10 mA cm −2 at an ultralow OER overpotential of 194 mV in 1.0 M KOH.