Amorphous Cobalt Vanadium Oxide as a Highly Active Electrocatalyst for Oxygen Evolution

Liardet, Laurent; Hu, Xile

doi:10.1021/acscatal.7b03198

Cited by 240 publications

(172 citation statements)

References 32 publications

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“…Only V 3+ was reserved after OER (Figure S4, Supporting Information), which indicated that V 4+ and V 5+ could be dissolved in alkaline solution . For anion, the O 1s XPS spectrum shown in Figure d can be divided into three peaks which locate at 531.8, 530.6, and 530.1 eV, corresponding to H 2 O, OH − , and O 2− , respectively …”

Section: Resultsmentioning

confidence: 99%

Cation‐Modulated HER and OER Activities of Hierarchical VOOH Hollow Architectures for High‐Efficiency and Stable Overall Water Splitting

Zhang

Cui

Gao

et al. 2019

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Atom‐scale modulation of electronic regulation in nonprecious‐based electrocatalysts is promising for efficient catalytic activities. Here, hierarchically hollow VOOH nanostructures are rationally constructed by partial iron substitution and systematically investigated for electrocatalytic water splitting. Benefiting from the hierarchically stable scaffold configuration, highly electrochemically active surface area, the synergistic effect of the active metal atoms, and optimal adsorption energies, the 3% Fe (mole ratio) substituted electrocatalyst (VOOH‐3Fe) exhibits a low overpotential of 90 and 195 mV at 10 mA cm−2 for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline media, respectively, superior than the other samples with a different substituted ratio. To the best of current knowledge, 195 mV overpotential at 10 mA cm−2 is the best value reported for V or Fe (oxy)hydroxide‐based OER catalysts. Moreover, the electrolytic cell employing the VOOH‐3Fe electrode as both the cathode and anode exhibits a cell voltage of 0.30 V at 10 mA cm−2 with a remarkable stability over 60 h. This work heralds a new pathway to design efficient bifunctional catalysts toward overall water splitting.

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Section: Resultsmentioning

confidence: 99%

Cation‐Modulated HER and OER Activities of Hierarchical VOOH Hollow Architectures for High‐Efficiency and Stable Overall Water Splitting

Zhang

Cui

Gao

et al. 2019

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show abstract

“…For example, Jaramillo's group developed Ce‐doped NiO x on Au substrate and found that Ce and Au affect the electronic structure of active Ni sites and facilitate the OER process on NiO x . Noting that the foreign metallic atom doping can balance the absorption and desorption energies for the intermediate species, amorphous CoVO x catalysts were prepared with rational bond energies . Fe‐doped VOOH hollow spheres were also synthesized by Sun's group following the similar principle .…”

Section: Nonprecious‐metal‐based Catalystsmentioning

confidence: 99%

Design of Multi‐Metallic‐Based Electrocatalysts for Enhanced Water Oxidation

Dastafkan

Zhao

2019

ChemPhysChem

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Electrochemical water splitting by renewable energy resources is an efficient and green approach for hydrogen gas production. However, the anodic oxygen evolution reaction (OER) largely impedes the industrial application due to its sluggish four‐electron‐transition kinetics. Although various materials have been developed to accelerate the OER rate, still some issues should be addressed to meet the industrial demand: (i) considerable 200–300 mV overpotential as extra onset energy input, (ii) limited survival and performance in acidic electrolyte for the majority of oxide/hydroxide composite materials, (iii) unsatisfying long‐term durability and (iv) the need for facile and scalable preparation methods. Here, we emphasize on multi‐metallic composites with enhanced OER activity based on both precious and nonprecious elements that outperform the unary and binary composites. The regulation effect from multi‐metal incorporation is also summarized systematically: (i) introducing foreign metal atoms to the host material boosts the physical properties such as conductivity, surface area, defect density, morphology, wettability, etc., (ii) metal doping can synergistically regulate the electronic features of the host material, e. g. oxygen vacancy, eg orbit filling, coordinative number and covalence state, which can optimize the absorption/desorption energy of the M−O intermediate, (iii) chaotic impact from the added atoms twists the catalyst lattice into a more aggressive and higher energy state, which is more feasible to transform to an active intermediate with lower required energy supply. This review aims to provide a practical approach to further improve the OER performance via multi‐metallic‐based catalysts.

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“…Plenty of studies have reported that transition metal-based oxides and (oxy)hydroxides were used for their superior electrochemical performances in sodium ion batteries, [21][22][23] supercapacitors, [24][25][26] and electrocatalytic water splitting. [27][28][29][30][31][32][33] Particularly, iron (Fe)-based materials, known for their low-cost, earth-abundant and environmentally friendly characteristics, are widely used in water oxidation as electrocatalysts. [34][35][36] For example, Lou et al reported a self-templated method to improve the catalytic properties of the hydroxide in OER by obtaining ultrathin NiÀ Fe layered double hydroxide nanosheets which was composed of the hierarchical hollow nanoprisms.…”

Section: Introductionmentioning

confidence: 99%

One‐Step Synthesis of a Coral‐Like Cobalt Iron Oxyhydroxide Porous Nanoarray: An Efficient Catalyst for Oxygen Evolution Reactions

Zhang

Song

et al. 2019

ChemPlusChem

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The design of high‐efficiency and cost‐effective electrocatalysts is one of the most crucial factors for facilitating the oxygen evolution reaction (OER). Therefore, we prepared CoxFe1‐xOOH with coral‐like nanonet arrays on carbon cloth (CC) as high‐performance OER catalysts by a facile hydrothermal method. The resulting CoxFe1‐xOOH was characterized by X‐ray diffraction, scanning electron microscopy, transmission electron microscopy, and X‐ray photoelectron spectrometry. When serving as a catalyst electrode in the OER, Co0.875Fe0.125OOH/CC exhibits excellent catalytic activity. Co0.875Fe0.125OOH/CC has a low overpotential of 300 mV at a current density of 20 mA cm−2 (150 mV less than that of FeOOH/CC) and a small Tafel slope of 83 mV dec−1 in 1.0 M KOH in OER. Moreover, it also has a superior electrochemical durability for more than 50 h.

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Amorphous Cobalt Vanadium Oxide as a Highly Active Electrocatalyst for Oxygen Evolution

Cited by 240 publications

References 32 publications

Cation‐Modulated HER and OER Activities of Hierarchical VOOH Hollow Architectures for High‐Efficiency and Stable Overall Water Splitting

Cation‐Modulated HER and OER Activities of Hierarchical VOOH Hollow Architectures for High‐Efficiency and Stable Overall Water Splitting

Design of Multi‐Metallic‐Based Electrocatalysts for Enhanced Water Oxidation

One‐Step Synthesis of a Coral‐Like Cobalt Iron Oxyhydroxide Porous Nanoarray: An Efficient Catalyst for Oxygen Evolution Reactions

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