Ultrathin amorphous cobalt–vanadium hydr(oxy)oxide catalysts for the oxygen evolution reaction

Liu, Juzhe; Ji, Yongfei; Nai, Jianwei; Niu, Xiaogang; Luo, Yi; Guo, Lin; Yang, Shihe

doi:10.1039/c8ee00611c

Cited by 344 publications

(263 citation statements)

References 47 publications

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“…The high electrochemical C dl indicates that P‐Co 9 S 8 possess the richest catalytic sites, which is in favor of the enhanced OER activity of P‐Co 9 S 8 . The electrical conductivity is closely related to the electrocatalytic activity of catalysts . As expected, the semicircle of P‐Co 9 S 8 nanocages is much smaller than that of Co 9 S 8 and CoS 2 , which indicates the higher electrical conductivity of P‐Co 9 S 8 (Figure S13a, Supporting Information).…”

Section: Resultssupporting

confidence: 56%

“…Clearly, the P‐Co 9 S 8 nanocages show the smallest resistance of the solution and electrode ( R s ). Meanwhile, the charge transfer resistance ( R ct ) value of P‐Co 9 S 8 (10.23 Ω) shows an obvious decrease as compared to that of Co 9 S 8 (16.94 Ω), indicating P doping can contribute to improving the carrier mobility on the interface of catalyst and electrolyte …”

Section: Resultsmentioning

confidence: 99%

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Phosphorus Incorporation into Co₉S₈ Nanocages for Highly Efficient Oxygen Evolution Catalysis

Qiu

Cai

Wang

et al. 2019

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The improvement of activity of electrocatalysts lies in the increment of the density of active sites or the enhancement of intrinsic activity of each active site. A common strategy to realize dual active sites is the use of bimetal compound catalysts, where each metal atom contributes one active site. In this work, a new concept is presented to realize dual active sites with tunable electron densities in monometal compound catalysts. Dual Co2+ tetrahedral (Co2+(Td)) and Co3+ octahedral (Co3+(Oh)) coordination active sites are developed and adjustable electron densities on the Co2+(Td) and Co3+(Oh) are further achieved by phosphorus incorporation (P‐Co9S8). The experimental results and density functional theory calculations show that the nonmetal P doping can systematically modulate charge density of Co2+(Td) and Co3+(Oh) in P‐Co9S8 and simultaneously improve the electrical conductivity of Co9S8, which substantially enhances oxygen evolution reaction performance of P‐Co9S8.

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Section: Resultssupporting

confidence: 56%

Section: Resultsmentioning

confidence: 99%

Phosphorus Incorporation into Co₉S₈ Nanocages for Highly Efficient Oxygen Evolution Catalysis

Qiu

Cai

Wang

et al. 2019

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“…An extraordinarily low onset potential is calculated as 1.425 V (η 10 ) from VOOH‐Fe sample, which was significantly lower than the other four electrodes (VOOH‐5Fe: 1.472 V, VOOH‐1Fe: 1.477 V, VOOH‐10Fe: 1.479 V, and VOOH‐0Fe: 1.484 V). To the best of our knowledge, 195 mV overpotential versus 10 mA cm −2 is the best value reported for V or Fe (oxy)hydroxides and transcends many of the previously reported nonprecious metal OER catalysts, including Fe 0.5 V 0.5 OOH, Fe 0.33 Co 0.67 OOH, MoFe:Ni(OH) 2 /NiOOH, Co‐V hydr(oxy)oxide, F‐CoOOH/NF, CoS x /N‐doped graphene, etc. (Table S3, Supporting Information).…”

Section: Resultssupporting

confidence: 68%

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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“…Extensive recent research interests have been focusing on using low cost first row transition metals such as Ni and Co for water splitting because of their excellent activity and stability . However, only limited amount of reported catalysts are able to achieve the high activity and stability matching those of RuO 2 , IrO 2 , and Pt, particularly under harsh working conditions required in industrial applications such as high current density and strong gas evolution.…”

Section: Introductionmentioning

confidence: 99%

Reversible ternary nickel‐cobalt‐iron catalysts for intermittent water electrolysis

Zhang

et al. 2020

EcoMat

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Global‐scale application of water splitting technology for hydrogen fuel production and storage of intermittent renewable energy sources such as solar and wind has called for the development of oxygen evolution catalysts and hydrogen evolution catalysts that are inexpensive, efficient, robust, and can withstand frequent power interruptions and shutdowns. Current water electrolyzers must operate with a protective current in stand‐by/idle modes to avoid a substantial catalyst degradation. Here, we show a hierarchically structured porous ternary composite catalyst of nickel, cobalt and iron (NiCoFe) hydroxides prepared via electrodeposition on three‐dimensional (3D) nickel foam (NF) substrates as reversible bifunctional electrodes for both oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). The NiCoFe/NF electrode exhibits exceptionally high catalytic activity, requiring overpotentials as low as 220 and 50 mV, respectively, for OER and HER to occur. In a water electrolysis cell comprising of two NiCoFe/NF electrodes, an overall cell overpotential of merely 300 mV is required to deliver a stabilized current density of 3 mA cm−2. The ternary electrocatalyst also exhibits prolonged stability under both continuous and intermittent electrolysis and can be used for oxygen evolution and hydrogen evolution reversibly without degradation.

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Ultrathin amorphous cobalt–vanadium hydr(oxy)oxide catalysts for the oxygen evolution reaction

Abstract: A simple strategy to synthesize ultrathin, amorphous and alloyed structural cobalt–vanadium hydr(oxy)oxide catalysts with enhanced water oxidation catalytic activity.

Cited by 344 publications

References 47 publications

Phosphorus Incorporation into Co₉S₈ Nanocages for Highly Efficient Oxygen Evolution Catalysis

Phosphorus Incorporation into Co₉S₈ Nanocages for Highly Efficient Oxygen Evolution Catalysis

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

Reversible ternary nickel‐cobalt‐iron catalysts for intermittent water electrolysis

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Ultrathin amorphous cobalt–vanadium hydr(oxy)oxide catalysts for the oxygen evolution reaction

Abstract: A simple strategy to synthesize ultrathin, amorphous and alloyed structural cobalt–vanadium hydr(oxy)oxide catalysts with enhanced water oxidation catalytic activity.

Cited by 344 publications

References 47 publications

Phosphorus Incorporation into Co9S8 Nanocages for Highly Efficient Oxygen Evolution Catalysis

Phosphorus Incorporation into Co9S8 Nanocages for Highly Efficient Oxygen Evolution Catalysis

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

Reversible ternary nickel‐cobalt‐iron catalysts for intermittent water electrolysis

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Phosphorus Incorporation into Co₉S₈ Nanocages for Highly Efficient Oxygen Evolution Catalysis

Phosphorus Incorporation into Co₉S₈ Nanocages for Highly Efficient Oxygen Evolution Catalysis