Self-supporting ZnO-Cu2S nanoflower arrays heterostructure with superhydrophilic and aerophobic properties for oxygen evolution reaction

Jiang, Jinbo; Wang, Lili; Zhu, Jianxi; Yang, Ying; Wang, Tianqi; Tao, Haijun; Wang, Tingting; Dong, Xiangting

doi:10.1016/j.jallcom.2023.170814

Cited by 10 publications

(2 citation statements)

References 45 publications

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“…Therefore, it is imperative to develop universally active water splitting electrocatalysts based on earth-abundant and cheaper materials, representing a significant advancement. As a result, many different transitionmetal electrocatalysts, such as transition-metal oxides, 5 transition-metal phosphides (TMPs), 6 transition-metal sulfides, 7,8 transition-metal nitrides, 9 ides 10,11 have demonstrated tremendous potential in water electrolysis. Specifically, TMP-based electrocatalysts such as M−P, M− M′−P and M−M′−M″−P (M, M′ and M″ = Fe, Ni, Co, Cu, Ru, etc.)…”

Section: Introductionmentioning

confidence: 99%

Experimental and Computational Insights into the Overall Water Splitting Reaction by the Fe–Co–Ni–P Electrocatalyst

Kumar,

Antil,

Kumar

et al. 2023

ACS Appl. Mater. Interfaces

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Nonprecious transition-metal phosphides (TMPs) are versatile materials with tunable electronic and structural properties that could be promising as catalysts for energy conversion applications. Despite the facts, TMPs are not explored thoroughly to understand the chemistry behind their rich catalytic properties for the water splitting reaction. Herein, spiky ball-shaped monodispersed TMP nanoparticles composed of Fe, Co, and Ni are developed and used as efficient electrocatalysts for hydrogen and oxygen evolution reaction (HER, OER), and overall water splitting in alkaline medium; and their surface chemistry was explored to understand the reaction mechanism. The optimized Fe 0.5 CoNi 0.5 P catalyst shows attractive activities of HER and OER with low overpotentials and Tafel slopes, and with high mass activities, turnover frequencies, and exchange current densities. When applied to overall water splitting, the electrolyzer Fe 0.5 CoNi 0.5 P||Fe 0.5 CoNi 0.5 P cell can reach a 10 mA cm −2 current density at cell voltages of only 1.52 and 1.56 V in 1.0 M and 30 wt % KOH, respectively, much lower than those of commercial IrO 2 ||Pt/C. The optimized electrolyzer with sizable numbers of chemically active sites exhibits superior durability up to 70 h and 5000 cycles in 1.0 M KOH and can attain a current density as high as 1000 mA cm −2 , showing a class of efficient bifunctional electrocatalysis. Experimental and density functional theory-based mechanistic analyses reveal that surface reconstruction takes place in the presence of KOH to form the TMP precatalyst, which results in high coverage of oxygen active species for the OER with a low apparent activation energy (E a ) for conversion of *OOH to O 2 . These also evidenced the thermoneutral adsorption of H* for the efficient HER half-reaction.

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Section: Introductionmentioning

confidence: 99%

Experimental and Computational Insights into the Overall Water Splitting Reaction by the Fe–Co–Ni–P Electrocatalyst

Kumar,

Antil,

Kumar

et al. 2023

ACS Appl. Mater. Interfaces

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“…Meanwhile, the photocatalytic activities present an intensity correlation to the separation and transfer of the e – /h + pairs. − The photoluminescence (PL) technique, reflecting the e – /h + pair separation and recombination processes, is widely used to investigate the photocatalyst. In Figure c, as the Er 3+ /Yb 3+ concentration increases, the PL emission intensity changes slightly, which indicates that the doping of Er 3+ /Yb 3+ improves the separation of the e – /h + pairs.…”

Section: Resultsmentioning

confidence: 99%

Swallowed Embedding of Nanopetal-Rich Microflowers in Flexible Photocatalytic and Thermoresponsive Functional Composite Fibers

Tao,

Luo,

Shen

et al. 2024

Langmuir

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Developing efficient catalysts to degrade pollutants in water is a very important way to alleviate water pollution. However, it is crucial but challenging to broaden the functions of conventional photocatalysts and improve their environmental adaptability. In this paper, Bi(Er 3+ /Yb 3+ )OBr/polyacrylonitrile (BOB-EY/PAN) composite fibers with a swallowed-embedded structure assembled with nanopetal-rich microflowers were designed and fabricated, integrating photocatalytic and temperature-monitoring functions simultaneously. Their unique structure brings a large specific surface area, and the doping of rare earth ions improves the separation efficiency of electron−hole pairs, which enhances the photocatalytic efficiency and endows the fibers with a temperature-monitoring function at the same time. Under simulated sunlight irradiation, the nanofibers show a maximum degradation efficiency of 99.2% for tetracycline hydrochloride (TC) with a degradation constant of K as high as 0.078 min −1 . Based on the fluorescence intensity ratio (FIR), the two thermally coupled levels of Er 3+ in the nanofibers, 2 H 11/2 and 4 S 3/2 , provide real-time temperature feedback, displaying a maximum relative sensitivity as high as 0.0215 K −1 at 303 K. Dual-functional BOB-EY/PAN composite nanofibers show great potential for industrial wastewater disposition, providing solutions for wastewater purification in special scenarios.

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Science and Engineering of Superaerophobic Surfaces for Electrochemical Gas—Evolving Reactions: A Review of Recent Advances and Perspective

Abedi,

Barati Darband

2024

Advanced Sustainable Systems

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In energy conversion processes and various industries, gas evolution reactions (GERs) play an important role. To achieve a future without fossil fuels, the development of high‐efficiency electrocatalysts is necessary, as they directly affect the catalytic performance and overall efficiency of reactions. In addition to the discovery of highly active catalysts, the rapid removal of gaseous products on the electrode surface is equally important for GERs. The adherence of bubbles to the electrode surface introduces substantial resistance, significantly diminishing the system's efficiency. One promising solution to reduce the adhesion of bubbles is the development of electrocatalysts with superaerophobic levels. These surface structures, such as nanotubes, nanosheets, and nanowires, prevent gas bubbles from adhering and promote their rapid removal from the electrode. The aim of this review is first to obtain a deep understanding of mechanisms related to the creation of superaerophobic surfaces, including their characteristics, methods of creation, and bubble detachment behavior. Furthermore, recent advances in the application of these surfaces in various gas‐evolving reactions to enhance electrocatalytic properties are discussed. By taking this innovative approach, valuable insights can be gained into advancing the field of electrocatalysis and driving progress toward sustainable energy solutions.

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Self-supporting ZnO-Cu2S nanoflower arrays heterostructure with superhydrophilic and aerophobic properties for oxygen evolution reaction

Cited by 10 publications

References 45 publications

Experimental and Computational Insights into the Overall Water Splitting Reaction by the Fe–Co–Ni–P Electrocatalyst

Experimental and Computational Insights into the Overall Water Splitting Reaction by the Fe–Co–Ni–P Electrocatalyst

Swallowed Embedding of Nanopetal-Rich Microflowers in Flexible Photocatalytic and Thermoresponsive Functional Composite Fibers

Science and Engineering of Superaerophobic Surfaces for Electrochemical Gas—Evolving Reactions: A Review of Recent Advances and Perspective

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