In situ evolution of surface Co2CrO4 to CoOOH/CrOOH by electrochemical method: Toward boosting electrocatalytic water oxidation

Zhao, Jinxiu; Ren, Xiang; Sun, Xu; Zhang, Yihe; Wei, Qin; Liu, Xuejing; Wu, Dan

doi:10.1016/s1872-2067(20)63730-5

Cited by 23 publications

(14 citation statements)

References 41 publications

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“…Three O 1s peaks at 529.5, 530.9, and 532.3 eV were observed for Cr 2 Te 3 /CrOOH in Figure S4c, which correspond to the Cr−O, CrO−H, and H− O−H bonds. 37 Our results signify that the observed selfoptimization of OER performance should be related to the formation of Cr 2 Te 3 /CrOOH lateral heterostructures (Figure 2e). To understand the high OER activity of Cr 2 Te 3 /CrOOH heterostructure at atomic and electronic level, we resorted to first-principles calculation of the OER process based on the 4emechanism proposed by Nørskov et al on Cr 2 Te 3 , CrOOH, and Cr 2 Te 3 /CrOOH heterostructure structure models.…”

supporting

confidence: 62%

“…In the Te 3d region, the doublet peaks for Te 2– 3d 5/2 and Te 2– 3d 3/2 appear at 572.6 and 582.8 eV, respectively. Three O 1s peaks at 529.5, 530.9, and 532.3 eV were observed for Cr 2 Te 3 /CrOOH in Figure S4c, which correspond to the Cr–O, CrO–H, and H–O–H bonds . Our results signify that the observed self-optimization of OER performance should be related to the formation of Cr 2 Te 3 /CrOOH lateral heterostructures (Figure e).…”

supporting

confidence: 54%

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Field-Free Improvement of Oxygen Evolution Reaction in Magnetic Two-Dimensional Heterostructures

Xiong

Luo

et al. 2021

Nano Lett.

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Ferromagnetic (FM) electrocatalysts have been demonstrated to reduce the kinetic barrier of oxygen evolution reaction (OER) by spin-dependent kinetics and thus enhance the efficiency fundamentally. Accordingly, FM two-dimensional (2D) materials with unique physicochemical properties are expected to be promising oxygen-evolution catalysts; however, related research is yet to be reported due to their air-instabilities and low Curie temperatures (T C). Here, based on the synthesis of 2D air-stable FM Cr2Te3 nanosheets with a low T C around 200 K, room-temperature ferromagnetism is achieved in Cr2Te3 by proximity to an antiferromagnetic (AFM) CrOOH, demonstrating the accomplishment of long-ranged FM ordering in Cr2Te3 because the magnetic proximity effect stems from paramagnetic (PM)/AFM heterostructure. Therefore, the OER performance can be permanently promoted (without applied magnetic field due to nonvolatile nature of spin) after magnetization. This work demonstrates that a representative PM/AFM 2D heterostructure, Cr2Te3/CrOOH, is expected to be a high-efficient magnetic heterostructure catalysts for oxygen-evolution.

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supporting

confidence: 62%

supporting

confidence: 54%

Field-Free Improvement of Oxygen Evolution Reaction in Magnetic Two-Dimensional Heterostructures

Xiong

Luo

et al. 2021

Nano Lett.

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“…Meanwhile, a lower R ct was observed for Co 2 PÀ CuP 2 /NF than all other control samples, demonstrating a lower resistance at the electrode-electrolyte interface, which results in rapid electron transfer kinetics (Figure 4e). [33] The exchange current density (j 0 ) is calculated according to the Tafel slope to evaluate the intrinsic activity of the catalyst. The j 0 of Co 2 PÀ CuP 2 /NF (0.80 mA cm À 2 ) was significantly higher than Co 2 P/NF (0.75 mA cm À 2 ) and CuP 2 /NF (0.25 mA cm À 2 ), verifying that it has good intrinsic HER activity (Figure 4f).…”

Section: Electrocatalytic Performancementioning

confidence: 99%

Interfacial Regulation of Electron‐enhanced Co₂P−CuP₂ Sheet‐like Heterostructure as a Robust Bifunctional Electrocatalyst for Overall Water Splitting and Zn−H₂O Cell

et al. 2022

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Constructing the precious metal-free bifunctional electrocatalysts for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is highly desirable for overall water splitting and energy conversion devices in an alkaline medium.Here, the interface regulation strategy aims to synthesize a sheet-like Co 2 PÀ CuP 2 heterostructure supported on nickel foam (NF) through hydrothermal reaction, electrodeposition and phosphating treatment. The Co 2 PÀ CuP 2 /NF exhibits extraordinary electrocatalytic performance with overpotentials of 220 mV and 93 mV for OER and HER at a current density of 10 mA cm À 2 , respectively. Remarkably, an electrolyzer cell originated from Co 2 PÀ CuP 2 /NF electrodes required an ultralow cell voltage of 1.77 V@500 mA cm À 2 and 2.38 V@1000 mA cm À 2 for overall water splitting with prominent stability of at least 160 h. In addition, the ZnÀ H 2 O cell is assembled with Co 2 PÀ CuP 2 /NF as the cathode, achieving a high power density of 19.8 mW cm À 2 and long-term stability of 120 h. The electron transfer between Co and Cu species in the Co 2 PÀ CuP 2 /NF heterojunction can effectively improve the interaction between the active sites and the intermediates, thereby enhancing the electrocatalytic activity. This work opens up new insights into the preparation of highly active and durable bimetallic phosphide catalysts for water splitting and ZnÀ H 2 O cells.

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“…As a half-reaction of water-splitting, the cathodic HER efficiency acts as a key role in reducing the energy consumption during hydrogen generation. Thus, it is of importance to develop electrocatalysts with advantageous catalytic performance for HERs [ 15 , 16 , 17 , 18 , 19 , 20 , 21 ]. At present, Pt-based nanomaterials are still the state-of-the-art electrocatalysts for HERs due to having the lowest overpotential and the smallest Tafel slope [ 22 , 23 , 24 ].…”

Section: Introductionmentioning

confidence: 99%

Facile Synthesis of MoP-RuP2 with Abundant Interfaces to Boost Hydrogen Evolution Reactions in Alkaline Media

et al. 2021

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Exploiting efficient electrocatalysts for hydrogen evolution reactions (HERs) is important for boosting the large-scale applications of hydrogen energy. Herein, MoP-RuP2 encapsulated in N,P-codoped carbon (MoP-RuP2@NPC) with abundant interfaces were prepared via a facile avenue with the low-toxic melamine phosphate as the phosphorous resource. Moreover, the obtained electrocatalyst possessed a porous nanostructure, had abundant exposed active sites and improved the mass transport during the electrocatalytic process. Due to the above merits, the prepared MoP-RuP2@NPC delivered a greater electrocatalytic performance for HERs (50 mV@10 mA cm−2) relative to RuP2@NPC (120 mV) and MoP@NPC (195 mV) in 1 M KOH. Moreover, an ultralow potential of 1.6 V was required to deliver a current density of 10 mA cm−2 in the two-electrode configuration for overall water splitting. For practical applications, intermittent solar energy, wind energy and thermal energy were utilized to drive the electrolyzer to generate hydrogen gas. This work provides a novel and facile strategy for designing highly efficient and stable nanomaterials toward hydrogen production.

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In situ evolution of surface Co2CrO4 to CoOOH/CrOOH by electrochemical method: Toward boosting electrocatalytic water oxidation

Cited by 23 publications

References 41 publications

Field-Free Improvement of Oxygen Evolution Reaction in Magnetic Two-Dimensional Heterostructures

Field-Free Improvement of Oxygen Evolution Reaction in Magnetic Two-Dimensional Heterostructures

Interfacial Regulation of Electron‐enhanced Co₂P−CuP₂ Sheet‐like Heterostructure as a Robust Bifunctional Electrocatalyst for Overall Water Splitting and Zn−H₂O Cell

Facile Synthesis of MoP-RuP2 with Abundant Interfaces to Boost Hydrogen Evolution Reactions in Alkaline Media

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In situ evolution of surface Co2CrO4 to CoOOH/CrOOH by electrochemical method: Toward boosting electrocatalytic water oxidation

Cited by 23 publications

References 41 publications

Field-Free Improvement of Oxygen Evolution Reaction in Magnetic Two-Dimensional Heterostructures

Field-Free Improvement of Oxygen Evolution Reaction in Magnetic Two-Dimensional Heterostructures

Interfacial Regulation of Electron‐enhanced Co2P−CuP2 Sheet‐like Heterostructure as a Robust Bifunctional Electrocatalyst for Overall Water Splitting and Zn−H2O Cell

Facile Synthesis of MoP-RuP2 with Abundant Interfaces to Boost Hydrogen Evolution Reactions in Alkaline Media

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Interfacial Regulation of Electron‐enhanced Co₂P−CuP₂ Sheet‐like Heterostructure as a Robust Bifunctional Electrocatalyst for Overall Water Splitting and Zn−H₂O Cell