Ultrathin Iron-Cobalt Oxide Nanosheets with Abundant Oxygen Vacancies for the Oxygen Evolution Reaction.
Reads0
Chats0
TLDR
A facile solution reduction method using NaBH4 as a reductant is developed to prepare iron-cobalt oxide nanosheets (Fex Coy -ONSs) with a large specific surface area, ultrathin thickness, and, importantly, abundant oxygen vacancies that could improve electronic conductivity and facilitate adsorption of H2 O onto nearby Co3+ sites.Abstract:
Electrochemical water splitting is a promising method for storing light/electrical energy in the form of H2 fuel; however, it is limited by the sluggish anodic oxygen evolution reaction (OER). To improve the accessibility of H2 production, it is necessary to develop an efficient OER catalyst with large surface area, abundant active sites, and good stability, through a low-cost fabrication route. Herein, a facile solution reduction method using NaBH4 as a reductant is developed to prepare iron-cobalt oxide nanosheets (FexCoy-ONSs) with a large specific surface area (up to 261.1 m2 g−1), ultrathin thickness (1.2 nm), and, importantly, abundant oxygen vacancies. The mass activity of Fe1Co1-ONS measured at an overpotential of 350 mV reaches up to 54.9 A g−1, while its Tafel slope is 36.8 mV dec−1; both of which are superior to those of commercial RuO2, crystalline Fe1Co1-ONP, and most reported OER catalysts. The excellent OER catalytic activity of Fe1Co1-ONS can be attributed to its specific structure, e.g., ultrathin nanosheets that could facilitate mass diffusion/transport of OH− ions and provide more active sites for OER catalysis, and oxygen vacancies that could improve electronic conductivity and facilitate adsorption of H2O onto nearby Co3+ sites.read more
Citations
More filters
Journal ArticleDOI
Reaction environment self-modification on low-coordination Ni 2+ octahedra atomic interface for superior electrocatalytic overall water splitting
Kaian Sun,Kaian Sun,Lei Zhao,Lingyou Zeng,Shoujie Liu,Houyu Zhu,Yanpeng Li,Zheng Chen,Zewen Zhuang,Zhaoling Li,Zhi Liu,Dongwei Cao,Jinchong Zhao,Yunqi Liu,Yuan Pan,Chen Chen +15 more
TL;DR: In this paper, a coordination environment inheriting strategy is presented for designing low-coordination Ni2+ octahedra (L-Ni-8) atomic interface at a high concentration (4.6 at%).
Journal ArticleDOI
N and Mn dual-doped cactus-like cobalt oxide nanoarchitecture derived from cobalt carbonate hydroxide as efficient electrocatalysts for oxygen evolution reactions.
TL;DR: In this article, a cactus-like porous cobalt oxide (Co3O4) nanoarchitecture doped with manganese cation and nitrogen anion was fabricated on the nickel foam by hydrothermal and subsequent N2 plasma treatment.
Journal ArticleDOI
Multi-ion Modulated Single-Step Synthesis of a Nanocarbon Embedded with a Defect-Rich Nanoparticle Catalyst for a High Loading Sulfur Cathode
Jian Wang,Jian Wang,Lujie Jia,Haitao Liu,Chong Wang,Jun Zhong,Qingbo Xiao,Jin Yang,Shaorong Duan,Kun Feng,Na Liu,Wenhui Duan,Hongzhen Lin,Hongzhen Lin,Yuegang Zhang,Yuegang Zhang +15 more
TL;DR: Electrochemical analysis and theoretical simulation evidently verify the critical role of defect sites on catalyzing conversion reactions of sulfur species and reducing energy barriers in ODFO enhanced sulfur cathode, opening a new route to boosting conversion reaction kinetics by introduction of active oxygen defect sites in electrodes of various emerging ultra-fast batteries.
Journal ArticleDOI
Controllable oxygen vacancies and morphology engineering: ultra-high HER/OER activity under base-acid conditions and outstanding antibacterial properties
TL;DR: In this article , a facile and efficient hydrothermal accompanying an annealing method was proposed to synthesize a series of Mn-doped CoO nanomaterials with controllable oxygen vacancies and unique morphology.
Journal ArticleDOI
Tuning Co2+ Coordination in Cobalt Layered Double Hydroxide Nanosheets via Fe3+ Doping for Efficient Oxygen Evolution.
TL;DR: In this article, the authors proposed to tune Co2+ occupancy and coordination in cobalt-based LDH nanosheets via Fe3+ doping for efficient and stable electrocatalysis for oxygen evolution reaction (OER).
References
More filters
Journal ArticleDOI
Resolving surface chemical states in XPS analysis of first row transition metals, oxides and hydroxides: Sc, Ti, V, Cu and Zn
TL;DR: Biesinger et al. as mentioned in this paper proposed a more consistent and effective approach to curve fitting based on a combination of standard spectra from quality reference samples, a survey of appropriate literature databases and/or a compilation of literature references and specific literature references where fitting procedures are available.
Journal ArticleDOI
A perovskite oxide optimized for oxygen evolution catalysis from molecular orbital principles.
TL;DR: The high activity of BSCF was predicted from a design principle established by systematic examination of more than 10 transition metal oxides, which showed that the intrinsic OER activity exhibits a volcano-shaped dependence on the occupancy of the 3d electron with an eg symmetry of surface transition metal cations in an oxide.
Journal ArticleDOI
Active sites of nitrogen-doped carbon materials for oxygen reduction reaction clarified using model catalysts
TL;DR: In this paper, the oxygen reduction reaction (ORR) active site was characterized by using newly designed graphite (highly oriented pyrolitic graphite) model catalysts with well-defined π conjugation and well-controlled doping of N species.
Journal ArticleDOI
Universality in Oxygen Evolution Electrocatalysis on Oxide Surfaces
Isabela C. Man,Hai-Yan Su,Federico Calle-Vallejo,Heine Anton Hansen,José I. Martínez,Nilay İnoğlu,John R. Kitchin,Thomas F. Jaramillo,Jens K. Nørskov,Jan Rossmeisl +9 more
TL;DR: In this article, a large database of HO* and HOO* adsorption energies on oxide surfaces was used to analyze the reaction free energy diagrams of all the oxides in a general way.
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.