Heterostructured FeNi hydroxide for effective electrocatalytic oxygen evolution

Li, Fayan1,2; Li, Yanyan1,2; Li, Lei1,2; Luo, Wen3; Lu, Zhouguang3; Zhang, Xinyu1,2; Zheng, Zhiping1,2

2022-07-01

10.1039/d2sc02767d

Chemical Science   Impact Factor & Quartile

2041-6520

2041-6539

Hydrogen production technology by water splitting has been heralded as an effective means to alleviate the envisioned energy crisis. However, the overall efficiency of water splitting is limited by the effectiveness of the anodic oxygen evolution reaction (OER) due to the high energy barrier of the 4e(-) process. The key to addressing this challenge is the development of high-performing catalysts. Transition-metal hydroxides with high intrinsic activity and stability have been widely studied for this purpose. Herein, we report a gelatin-induced structure-directing strategy for the preparation of a butterfly-like FeNi/Ni heterostructure (FeNi/Ni HS) with excellent catalytic performance. The electronic interactions between Ni2+ and Fe3+ are evident both in the mixed-metal "torso" region and at the "torso/wing" interface with increasing Ni3+ as a result of electron transfer from Ni2+ to Fe3+ mediated by the oxo bridge. The amount of Ni3+ also increases in the "wings", which is believed to be a consequence of charge balancing between Ni and O ions due to the presence of Ni vacancies upon formation of the heterostructure. The high-valence Ni3+ with enhanced Lewis acidity helps strengthen the binding with OH- to afford oxygen-containing intermediates, thus accelerating the OER process. Direct evidence of FeNi/Ni HS facilitating the formation of the Ni-OOH intermediate was provided by in situ Raman studies; the intermediate was produced at lower oxidation potentials than when Ni-2(CO3)(OH)(2) was used as the reference. The Co congener (FeCo/Co HS), prepared in a similar fashion, also showed excellent catalytic performance.

SCI ; EI

English

NI Journal Papers

First ; Corresponding

Shenzhen Nobel Prize Scientists Laboratory Project[C17213101] ; Guangdong Provincial Key Laboratory of Catalysis[2020B121201002] ; Guangdong Provincial Key Laboratory of Energy Materials for Electric Power[2018B030322001] ; SUSTech["Y01216127","Y01216227"] ; Basic Research Project of the Science and Technology Innovation Commission of Shenzhen[JCYJ20190809115413414] ; Post-doctorate Scientific Research Fund for staying in (coming to) Shenzhen[K21217502]

Chemistry

Chemistry, Multidisciplinary

WOS:000834526100001

ROYAL SOC CHEMISTRY

20223212554420

Binary alloys ; Energy policy ; Hydrogen production ; Iron ; Nickel ; Reaction intermediates

Gas Fuels:522 ; Energy Policy:525.6 ; Iron:545.1 ; Nickel:548.1 ; Chemical Products Generally:804

Web of Science

1.Southern Univ Sci & Technol SUSTech, Guangdong Prov Key Lab Energy Mat Elect Power, Dept Chem, Shenzhen 518055, Peoples R China
2.Minist Educ, SUSTech, Key Lab Energy Convers & Storage Technol, Shenzhen 518055, Peoples R China
3.SUSTech, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China

Li, Fayan,Li, Yanyan,Li, Lei,et al. Heterostructured FeNi hydroxide for effective electrocatalytic oxygen evolution[J]. Chemical Science,2022,13:9256-9264.

Li, Fayan.,Li, Yanyan.,Li, Lei.,Luo, Wen.,Lu, Zhouguang.,...&Zheng, Zhiping.(2022).Heterostructured FeNi hydroxide for effective electrocatalytic oxygen evolution.Chemical Science,13,9256-9264.

Li, Fayan,et al."Heterostructured FeNi hydroxide for effective electrocatalytic oxygen evolution".Chemical Science 13(2022):9256-9264.