Cr-doped CoFe layered double hydroxides: Highly efficient and robust bifunctional electrocatalyst for the oxidation of water and urea

Wang, Zhong Lin; Liu, Wenjun; Hu, Yueyun; Guan, Meili; Xu, Li; Bao, Jian

doi:10.1016/j.apcatb.2020.118959

Cited by 254 publications

(139 citation statements)

References 57 publications

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“…[35,36] The Cu 2p spectrum showed two peaks at 933.2 and 953.5 eV (Figure 3c), which were Cu 2p 3/ Co 2p peaks in Cu 6.2% À Co(OH) 2 presented distinctly positive shifts (Figure 3d), meanwhile, those of O 1s were negatively shifted (Figure 3e), indicative of the intense electronic interplay between Co, O and Cu by Cu doping. The modulated electronic surroundings of metal centers in Cu 6.2% À Co(OH) 2 made the Co species with average higher valence state, which were effective active sites for UOR [18] and HER. [39] The Cu-doped Co(OH) 2 arrays on Ni foam were directly applied as monolithic working electrodes for UOR electrocatalysis.…”

Section: Resultsmentioning

confidence: 99%

“…Considering the potential for the oxidation of Co 2 + to Co 3 + is lower than that of Ni 2 + to Ni 3 + , the Co-based materials are more likely favorable for UOR electrocatalysis. Although several Co-based materials, including layer double hydroxides (LDH), [17,18] chalcogenides, [7,19] and phosphides, [20] have been applied in urea-assisted electrolytic hydrogen generation, they still undergo the unsatisfactory electrocatalytic performances, especially at large current densities. Therefore, it is necessary to construct Co-based catalysts with optimal structure for high-performance electrocatalysis toward UOR and HER.…”

Section: Introductionmentioning

confidence: 99%

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Co(OH)₂ Nanosheets Array Doped by Cu²⁺ Ions with Optimal Electronic Structure for Urea‐Assisted Electrolytic Hydrogen Generation

Wang

Zhang

et al. 2021

ChemElectroChem

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Urea electrolysis supplies a great potential in energy-saving hydrogen generation accompanied by simultaneous ureacontaining wastewater remediation. Herein, the Co(OH) 2 nanosheets arrays doped by different amount of Cu 2 + ions were prepared via a one-step solution-phase method for ureaassisted electrolytic hydrogen generation. The Cu integration can regulate electronic structure, activate Co active sites at low potential, and optimize the charge transfer properties and adsorption states of the catalyst. Moreover, the partially distorted cobalt surroundings caused by Cu dopant in the catalyst is conductive to favor the adsorption of urea and water molecules to the active sites. The optimal Cu 6.2% -Co(OH) 2 nanosheets array exhibited superior urea oxidation reaction (UOR) and hydrogen evolution reaction (HER) performances. Assembling an overall urea electrolyzer using two Cu 6.2% -Co(OH) 2 electrodes gave rise to very small voltages of 1.389 V for 10 mA cm À 2 and 1.781 V for a high current density of 500 mA cm À 2 with remarkable operational stability. The Cu 2 + ions doping strategy can be extended to a series of Ni-based compounds with adjustable electronic structures for boosting the activities of UOR and HER.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Co(OH)₂ Nanosheets Array Doped by Cu²⁺ Ions with Optimal Electronic Structure for Urea‐Assisted Electrolytic Hydrogen Generation

Wang

Zhang

et al. 2021

ChemElectroChem

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“…4 [51]. The peaks at 856.6 and 875.5 eV belong to Ni 3+ , while the other two peaks around 857.0 and 882.6 eV are assigned to satellite peaks [52]. As for Co 2p (Fig.…”

Section: Resultsmentioning

confidence: 92%

Nested hollow architectures of nitrogen-doped carbon-decorated Fe, Co, Ni-based phosphides for boosting water and urea electrolysis

et al. 2021

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Tailoring the nanostructure/morphology and chemical composition is important to regulate the electronic configuration of electrocatalysts and thus enhance their performance for water and urea electrolysis. Herein, the nitrogen-doped carbon-decorated tricomponent metal phosphides of FeP4 nanotube@Ni-Co-P nanocage (NC-FNCP) with unique nested hollow architectures are fabricated by a self-sacrifice template strategy. Benefiting from the multi-component synergy, the modification of nitrogen-doped carbon, and the modulation of nested porous hollow morphology, NC-FNCP facilitates rapid electron/mass transport in water and urea electrolysis. NC-FNCP-based anode shows low potentials of 248 mV and 1.37 V (vs. reversible hydrogen electrode) to attain 10 mA/cm2 for oxygen evolution reaction (OER) and urea oxidation reaction (UOR), respectively. In addition, the overall urea electrolysis drives 10 mA/cm2 at a comparatively low voltage of 1.52 V (vs. RHE) that is 110 mV lower than that of overall water electrolysis, as well as exhibits excellent stability over 20 h. This work strategizes a multi-shell-structured electrocatalyst with multi-compositions and explores its applications in a sustainable combination of hydrogen production and sewage remediation.

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“…1b). [28][29][30] The lamellar 2D structure increases the number of active sites exposed. The SEM of CoFe V -LDH was shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Cation vacancy driven efficient CoFe-LDH-based electrocatalysts for water splitting and Zn–air batteries

et al. 2021

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Cr-doped CoFe layered double hydroxides: Highly efficient and robust bifunctional electrocatalyst for the oxidation of water and urea

Cited by 254 publications

References 57 publications

Co(OH)₂ Nanosheets Array Doped by Cu²⁺ Ions with Optimal Electronic Structure for Urea‐Assisted Electrolytic Hydrogen Generation

Co(OH)₂ Nanosheets Array Doped by Cu²⁺ Ions with Optimal Electronic Structure for Urea‐Assisted Electrolytic Hydrogen Generation

Nested hollow architectures of nitrogen-doped carbon-decorated Fe, Co, Ni-based phosphides for boosting water and urea electrolysis

Cation vacancy driven efficient CoFe-LDH-based electrocatalysts for water splitting and Zn–air batteries

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Cr-doped CoFe layered double hydroxides: Highly efficient and robust bifunctional electrocatalyst for the oxidation of water and urea

Cited by 254 publications

References 57 publications

Co(OH)2 Nanosheets Array Doped by Cu2+ Ions with Optimal Electronic Structure for Urea‐Assisted Electrolytic Hydrogen Generation

Co(OH)2 Nanosheets Array Doped by Cu2+ Ions with Optimal Electronic Structure for Urea‐Assisted Electrolytic Hydrogen Generation

Nested hollow architectures of nitrogen-doped carbon-decorated Fe, Co, Ni-based phosphides for boosting water and urea electrolysis

Cation vacancy driven efficient CoFe-LDH-based electrocatalysts for water splitting and Zn–air batteries

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Co(OH)₂ Nanosheets Array Doped by Cu²⁺ Ions with Optimal Electronic Structure for Urea‐Assisted Electrolytic Hydrogen Generation

Co(OH)₂ Nanosheets Array Doped by Cu²⁺ Ions with Optimal Electronic Structure for Urea‐Assisted Electrolytic Hydrogen Generation