Journal ArticleDOI
Promoting Oxygen Evolution Reactions through Introduction of Oxygen Vacancies to Benchmark NiFe–OOH Catalysts
TLDR
In this paper, the authors obtained NiFe-based catalysts with appropriate electronic conductivity and catalytic activity through introduction of oxygen vacancies by a facile and economic NaBH4 reduction approach.Abstract:
Advanced electrocatalysts toward oxygen evolution reaction (OER) at high current density with low overpotential remain a significant challenge for electrochemical water splitting. Herein, NiFe-based catalysts with appropriate electronic conductivity and catalytic activity have been obtained through introduction of oxygen vacancies by a facile and economic NaBH4 reduction approach. The combined density functional theory calculations, physical characterization, and electrochemical studies disclose that the reductive treatment creates a high amount of oxygen vacancies, high active sites, and a low energy barrier for OER. The oxygen vacancy-rich catalyst yields a more than 2-fold increased current density (from 100 to 240 mA cm–2) at a low overpotential of 270 mV, accompanied by good stability under OER conditions. The approach is also broadly applicable for NiFe compounds synthesized via different methods or substrates.read more
Citations
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Journal ArticleDOI
Recent advances in layered double hydroxide electrocatalysts for the oxygen evolution reaction
TL;DR: In this paper, a review of layered double hydroxides (LDHs) as one of the promising OER electrocatalysts has been extensively researched due to their unique 2D layered structure and excellent physicochemical properties.
Journal ArticleDOI
The roles of oxygen vacancies in electrocatalytic oxygen evolution reaction
TL;DR: In this paper, a review of the recent development of manipulating the oxygen vacancies in electrocatalysts for enhancing OER performance is reviewed and the proposed mechanisms for the enhanced performance are discussed in detail.
Journal ArticleDOI
Engineering single-atomic ruthenium catalytic sites on defective nickel-iron layered double hydroxide for overall water splitting.
Panlong Zhai,Mingyue Xia,Yunzhen Wu,Guanghui Zhang,Junfeng Gao,Bo Zhang,Shuyan Cao,Yanting Zhang,Zhuwei Li,Zhaozhong Fan,Chen Wang,Xiaomeng Zhang,Jeffrey T. Miller,Licheng Sun,Licheng Sun,Licheng Sun,Jungang Hou +16 more
TL;DR: In this article, a single-atomic-site ruthenium stabilized on defective nickel-iron layered double hydroxide nanosheets (Ru1/D-NiFe LDH) was reported.
Journal ArticleDOI
Rh-engineered ultrathin NiFe-LDH nanosheets enable highly-efficient overall water splitting and urea electrolysis
Huachuan Sun,Wei Zhang,Jian-Gang Li,Zhishan Li,Xiang Ao,Kan-Hao Xue,Kostya Ostrikov,Jiang Tang,Chundong Wang,Chundong Wang +9 more
TL;DR: In this article, ultrathin rhodium-doped nickel iron layered double hydroxide nanosheets are successfully synthesized, which exhibit outstanding hydrogen evolution reaction (HER) and OER performance, and advanced overall water splitting.
Journal ArticleDOI
A review on NiFe-based electrocatalysts for efficient alkaline oxygen evolution reaction
TL;DR: In this paper, the authors reviewed the recent advancement in terms of synthetic methodologies, chemical properties, density functional theory (DFT) calculations, and catalytic performances of several nanostructured NiFe-based OER electrocatalysts, and those include layered double hydroxide (LDH), cation/anion/formamide intercalated LDH, teranary LDH/LTH (LTH: Layered-triple-hydroxide), LDH integrated with carbon, hetero atom doped/core-shell structured/
References
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Journal ArticleDOI
Co3O4 nanocrystals on graphene as a synergistic catalyst for oxygen reduction reaction
TL;DR: The Co₃O₄/N-doped graphene hybrid exhibits similar catalytic activity but superior stability to Pt in alkaline solutions, making it a high-performance non-precious metal-based bi-catalyst for both ORR and OER.
Journal ArticleDOI
Benchmarking Heterogeneous Electrocatalysts for the Oxygen Evolution Reaction
TL;DR: In this paper, the authors report a protocol for evaluating the activity, stability, and Faradaic efficiency of electrodeposited oxygen-evolving electrocatalysts for water oxidation.
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Analysis of XPS spectra of Fe2+ and Fe3+ ions in oxide materials
Toru Yamashita,Peter C. Hayes +1 more
TL;DR: In this paper, the peak positions and peak shape parameters of Fe 3p for Fe2+ and Fe3+ were derived from the XPS spectra of the standard samples of 2FeO·SiO2 and Fe2O3, respectively.
Journal ArticleDOI
Synthesis and Activities of Rutile IrO2 and RuO2 Nanoparticles for Oxygen Evolution in Acid and Alkaline Solutions
TL;DR: This study shows that these r-RuO2 and r-IrO2 NPs can serve as a benchmark in the development of active OER catalysts for electrolyzers, metal-air batteries, and photoelectrochemical water splitting applications.
Journal ArticleDOI
Investigation of multiplet splitting of Fe 2p XPS spectra and bonding in iron compounds
TL;DR: In this paper, the authors investigated the usefulness of calculated multiplet peaks to fit high-resolution iron 2p3/2 spectra from high-spin compounds. And they found that the multiplets were found to fit most spectra well, particularly when contributions attributed to surface peaks and shake-up satellites were included.