Intrinsic-structural-modulated carbon cloth as efficient electrocatalyst for water oxidation

Fan, Xizheng; Pang, Qingqing; Yi, Shasha; Du, Xin; Zhang, Shuo; Liu, Zhongyi; Yue, Xinzheng

doi:10.1016/j.apcatb.2021.120152

Cited by 36 publications

(11 citation statements)

References 45 publications

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“…In addition, the quantitative evaluation of O 2 from OER over Co 2 Al 1 LDH/CC can be achieved by the drainage method, and Figure f shows the amount of generated O 2 as a function of time. Obviously, the actual amount of O 2 produced was remarkably consistent with the theoretical value, indicating an almost 100% faradic efficiency toward OER …”

Section: Resultssupporting

confidence: 82%

“…The process diagram for the growth of Co 2 Al 1 LDH on carbon cloth (CC) is illustrated in Figure a. Typically, the purchased CC was first treated with HNO 3 through a hydrothermal reaction to make it hydrophilic. , Then, specific amounts of Co(CH 3 COO) 2 ·4H 2 O and Al(NO) 3 ·9H 2 O were chosen as the Co and Al precursors to synthesize Co 2 Al 1 LDH by a simple hydrothermal approach. In this reaction, CO(NH 2 ) 2 and NH 4 F were added to increase the OH – concentration through hydrolysis and serve as useful templating agents in many nanostructure constructions, respectively. , By adjusting the composition of Co(CH 3 COO) 2 ·4H 2 O and Al(NO) 3 ·9H 2 O as reactants, a series of Co x Al 3– x LDH/CC ( x = 1, 1.5, and 2.5) catalysts with various Co/Al molar ratios were constructed (see experimental procedures).…”

Section: Resultsmentioning

confidence: 99%

“…Generally, the purchased carbon cloth (CC) without any treatment was hydrophobic, which is inconducive to the subsequent in situ growth of catalysts, that is, the purchased CC was put into 25 mL of HNO 3 (2.5 M) and transferred to a 50 mL Teflon-lined stainless-steel autoclave at 200 °C for 2 h. After naturally cooling down, the CC was rinsed thoroughly with deionized water under ultrasonication and then dried at 60 °C. 21 As a result, the hydrophobic CC became hydrophilic with some oxygen functional groups at the surface, such as −OH, −C�O, and −COOH, which were more beneficial to the growth of catalysts. 15 S1 and S2) demonstrate that the real atomic ratios of Co to Al for Co x Al 3−x LDH/CC (x = 1, 1.5, 2, and 2.5) were much higher than the theoretical ones.…”

Section: Methodsmentioning

confidence: 99%

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Al-Incorporated Cobalt-Layered Double Hydroxides for Enhanced Oxygen Evolution through Morphology and Electronic Structure Regulation

Yue

Tang

et al. 2023

ACS Appl. Mater. Interfaces

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Layered double hydroxides (LDHs) are promising electrocatalytic materials for the oxygen evolution reaction (OER) due to their tunable composition and low cost. Here, we construct ultrathin Al-incorporated Co LDH nanosheets on carbon cloth (CC) by a facile hydrothermal strategy. Compared to Co LDH/CC, the optimized Co2Al1 LDH/CC displays significantly improved OER performance, characterized by low overpotentials of only 171 and 200 mV to reach current densities of 10 mA cm–2 in alkaline and neutral media, respectively, as well as good stability over an extended period. The introduced Al3+ and CC support play a synergistic role in steering the morphology of Co2Al1 LDH/CC while also increasing the electrochemical active sites. X-ray absorption fine spectra (XAFS) analyses uncover the critical role of Al in regulating the coordination environment of Co atoms, with evidence affording highly active Co oxidation states. Moreover, density functional theory (DFT) calculations confirmed that the Al3+ incorporated into Co LDH/CC can efficaciously modulate the electronic density of states of the d-band center of Co atoms, optimize the Gibbs free energies of intermediates toward OER, and thus accelerate the O2 evolution rate.

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Section: Resultssupporting

confidence: 82%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Al-Incorporated Cobalt-Layered Double Hydroxides for Enhanced Oxygen Evolution through Morphology and Electronic Structure Regulation

Yue

Tang

et al. 2023

ACS Appl. Mater. Interfaces

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“…Four models, including Co–N 1 , Co–N 4 , 2Co–N 4 , and 2Co–N 6 , have been established (Figure S1). Among them, we choose the optimized Co–N 1 model as the target structure, and the corresponding C–N 1 -defect and Co–N 1 -defect configurations were also established for comparison to disclose the necessity of the C defect (Figure A–C). ,, The OER pathway involves a four-electron-transfer process, which produces the intermediates of OH*, O*, and OOH* step-by-step (Supporting Information). The optimal absorption energies (Δ G 1 , Δ G 2 , Δ G 3 , and Δ G 4 ) in light of each reaction potential are summarized according to the computational hydrogen electrode model.…”

Section: Results and Discussionmentioning

confidence: 99%

In Situ Construction of Bifunctional N-Doped Carbon-Anchored Co Nanoparticles for OER and ORR

Fan

Pang

et al. 2022

ACS Appl. Mater. Interfaces

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Designing highly active and more durable oxygen electrocatalysts for regenerative metal-air batteries and water splitting is of practical significance. Herein, an advanced Co/N–C-800 catalyst composed of abundant Co–N x structures and carbon defects derived from cobalt phthalocyanine is synthesized. Remarkably, this catalyst exhibits favorable catalytic performance toward the oxygen evolution reaction (OER) with a receivable overpotential of 274 mV in an alkaline medium achieving a current density of 10 mA cm–2 and a Tafel slope of 43.6 mV decade–1, outperforming the commercial RuO2 catalyst. It further displays a high half-wave potential (0.82 V) for the oxygen reduction reaction in 0.1 M KOH. Theoretical calculations reveal that the Co–N x active sites along with the carbon defects can decrease the adsorption energy of intermediates (OH*, O*, and OOH*) and enhance the electron-transfer ability, thus boosting the OER process.

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“…The prepared CC-9NH 3 -3 h exhibits electrochemical properties comparable to commercial RuO 2 . [29] Herein, MnCo 2 S 4 microrugby balls supported on carbon cloth (MnCo 2 S 4 /CC) was synthesized by a two-step hydrothermal method as an efficient OER electrocatalyst. In this compound, MnCo 2 S 4 microspheres have a rich pore structure and grow uniformly in situ on the carbon cloth.…”

Section: Introductionmentioning

confidence: 99%

Three‐Dimensional Porous MnCo₂S₄ Microrugby Balls Supported on Carbon Cloth for Efficient Oxygen Evolution Reaction

Dai

Shen

et al. 2022

ChemElectroChem

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The design and development of oxygen evolution electrocatalyst with stable structure and outstanding performance is of great significance for hydrogen production by water electrolysis. Inspired by the high stability of the self‐supported catalyst and the synergistic effect of the bimetallic transition metal catalyst, MnCo2S4 microrugby balls were successfully prepared on carbon cloth by a two‐step hydrothermal method in this work. The prepared MnCo2S4/CC exhibits remarkable electrochemical performance due to the stable self‐supporting design and lavish porous structure, as well as the high inherent electrical conductivity of sulphide. The overpotential of MnCo2S4/CC is only 180 mV at the current density of 10 mA cm−2, which is 161 mV lower than that of MnCo2O4/CC (341 mV). The Tafel slope of MnCo2S4/CC is 145.7 mV dec−1, which is less than that of MnCo2O4/CC (157.5 mV dec−1). The OER performance of MnCo2S4/CC is significantly improved due to its high electrochemically active surface area and conductivity. Density functional theory (DFT) calculations show that MnCo2S4/CC has a higher electron density than MnCo2O4/CC, which indicates that it has better conductivity. These results indicate that it is a feasible method to optimize the performance of the electrocatalysts by combining the large electrochemical surface area provided by the porous structure of the self‐supported catalyst and the large electrical conductivity of the sulphide.

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Intrinsic-structural-modulated carbon cloth as efficient electrocatalyst for water oxidation

Cited by 36 publications

References 45 publications

Al-Incorporated Cobalt-Layered Double Hydroxides for Enhanced Oxygen Evolution through Morphology and Electronic Structure Regulation

Al-Incorporated Cobalt-Layered Double Hydroxides for Enhanced Oxygen Evolution through Morphology and Electronic Structure Regulation

In Situ Construction of Bifunctional N-Doped Carbon-Anchored Co Nanoparticles for OER and ORR

Three‐Dimensional Porous MnCo₂S₄ Microrugby Balls Supported on Carbon Cloth for Efficient Oxygen Evolution Reaction

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Intrinsic-structural-modulated carbon cloth as efficient electrocatalyst for water oxidation

Cited by 36 publications

References 45 publications

Al-Incorporated Cobalt-Layered Double Hydroxides for Enhanced Oxygen Evolution through Morphology and Electronic Structure Regulation

Al-Incorporated Cobalt-Layered Double Hydroxides for Enhanced Oxygen Evolution through Morphology and Electronic Structure Regulation

In Situ Construction of Bifunctional N-Doped Carbon-Anchored Co Nanoparticles for OER and ORR

Three‐Dimensional Porous MnCo2S4 Microrugby Balls Supported on Carbon Cloth for Efficient Oxygen Evolution Reaction

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Product

Resources

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Three‐Dimensional Porous MnCo₂S₄ Microrugby Balls Supported on Carbon Cloth for Efficient Oxygen Evolution Reaction