Solar-boosted electrocatalytic oxygen evolution via catalytic site remodelling of CoCr layered double hydroxide

Meng, Huiyuan; Wu, Xi; Ren, Zhiyu; Wu, Jun; Zhao, Lei; Liu, Bowen; Fu, Honggang

doi:10.1016/j.apcatb.2020.119707

Cited by 31 publications

(23 citation statements)

References 68 publications

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“…26 Chromium (Cr), which is in the same group as W in the periodic table, is considered a suitable dopant to boost the catalytic property of Co, and the related exploration of CoCr layered double hydroxide (LDH) or Cr-doped CoFe LDH has been reported in the electrochemical field. 27–29…”

Section: Introductionmentioning

confidence: 99%

Expediting hole transfer via surface states in hematite-based composite photoanodes

et al. 2022

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Section: Introductionmentioning

confidence: 99%

Expediting hole transfer via surface states in hematite-based composite photoanodes

et al. 2022

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“…To solve the crisis of energy resource and multifarious increasingly serious environmental problems, hydrogen (H 2 ) production has received extensive attention. − Photoassisted electrocatalytic (P-EC) water splitting to produce H 2 is considered to be a promising method because it takes advantage of the inexhaustible solar energy and can reduce electric energy consumption. − Generally, in a P-EC reaction system, the catalysts should have the photo- and electrocatalytic activity simultaneously. − In this field, many catalysts have been developed. − Hu’s group harnessed solar energy to improve the reaction kinetics of BiVO 4 -based zinc–air batteries . Yang’s group reported the catalyst CeVO 4 reducing the charge potential by a P-EC mechanism in Li–O 2 batteries .…”

Section: Introductionmentioning

confidence: 99%

Polyaniline/Carbon Dots Composite as a Highly Efficient Metal-Free Dual-Functional Photoassisted Electrocatalyst for Overall Water Splitting

Chen

et al. 2021

ACS Appl. Mater. Interfaces

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Photoassisted electrocatalytic (P-EC) water splitting for H2 production has received much attention. Here, we report a metal-free bifunctional photoassisted catalyst of a polyaniline/carbon dots (PANI/CDs) composite for overall water splitting. In a neutral electrolyte, under visible light, the overpotentials of the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) for PANI/CDs/NF are reduced by 150 and 65 mV to reach the current densities of 30 and 20 mA cm–2, respectively. In a full water-splitting cell, under visible light, the current density is 13.27 mA cm–2 at 2.0 V, which increases by 62.8% compared with that under the dark conditions (8.15 mA cm–2). The in situ transient photovoltage (TPV) tests were used to study the light-induced effects on half-reactions of water splitting, as well as the charge-transfer kinetic characteristics at the catalyst interface.

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“…At the same time, due to Cr doping, it has a strong electron-donating ability and stabilizes the valence state of cobalt, so as to avoid the generation of a large amount of saturated Co 3+ and the sharp decline of catalytic performance . In addition, due to the presence of Cr 3+ , electrons flow from Cr to Co along Cr 3+ –O–Co 2+ linkages, which weakens the adsorption of Cr-Co(Mo)O x to the intermediate OH* and promotes its desorption, accelerating the hydrogen evolution process. , In the subsequent step(III), as the hydrogen evolution process of PE-Cr-CoMoO 4 follows the Volmer–Heyrovsky mechanism, the intermediate H* adsorbed at P sites is combined with the free H + generated by water dissociation. In the last step(IV), a small amount of Cr-Co(Mo)O x and MoO 2 exists in the amorphous layer at the surface, which helps to accelerate electron transfer and weaken the adsorption energy of P to H*, promoting the desorption process of hydrogen on the surface, and thus accelerating the hydrogen evolution process.…”

Section: Resultsmentioning

confidence: 99%

Surface Engineering of Cr-Doped Cobalt Molybdate toward High-Performance Hydrogen Evolution

Qian

Wang

Jiang

et al. 2022

ACS Appl. Mater. Interfaces

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Replacing commercial noble metal catalysts with earth-abundant metal catalysts for hydrogen production is an important research direction for electrolytic water. Improving the catalytic performance of non-noble metals while maintaining stability is a key challenge for alkaline hydrogen evolution. Herein, we combined alkali etching and surface phosphating to regulate the properties of Cr-doped CoMoO4 material, forming a surface structure in which amorphous cobalt phosphate and Cr-doped Co(Mo)O x coexist. As expected, the as-prepared catalytic material exhibits remarkable hydrogen evolution activity in 1.0 M KOH, only requiring a low overpotential of 52.7 mV to achieve a current density of 10 mA cm–2, and can maintain this current density for 24 h. The characterization and analysis of the catalyst before and after the stability test reveal that the Cr doping and surface engineering (i.e., alkali etching and phosphating) synergistically increase the adsorption and dissociation of water, optimize the desorption of H, and ultimately accelerate hydrogen evolution. This work provides a new strategy for tailoring nonprecious metal materials to improve the hydrogen production from water electrolysis.

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Solar-boosted electrocatalytic oxygen evolution via catalytic site remodelling of CoCr layered double hydroxide

Cited by 31 publications

References 68 publications

Expediting hole transfer via surface states in hematite-based composite photoanodes

Expediting hole transfer via surface states in hematite-based composite photoanodes

Polyaniline/Carbon Dots Composite as a Highly Efficient Metal-Free Dual-Functional Photoassisted Electrocatalyst for Overall Water Splitting

Surface Engineering of Cr-Doped Cobalt Molybdate toward High-Performance Hydrogen Evolution

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