Inorganics
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2025
·Vol. 13
·期 7
·211
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IF 3
Wen Li,Di Yin,Wanxin Liu,Yi Li,Yijin Wu
The electrochemical oxidation of biomass-derived 5-hydroxymethylfurfural (HMF) coupled with water electrolysis for green hydrogen production is a promising strategy to address energy crises and environmental pollution. Despite the suitable adsorption energy for HMF due to their partially filled d-band electronic structures, Ni- or Co-based oxides/hydroxides still face challenges in insufficient activity and stability. In this study, a porous heterogeneous nickel cobalt oxide/hydroxide growth on nickel foam (NF), which is defined as NF@NiCo-H/O, was developed via immersion in concentrated alkali solution. Compared with the single-component NiCo oxides, the NF@NiCo-H/O catalyst exhibits a lower application potential of only 1.317 V, 1.395 V, and 1.443 V to achieve current densities of 20, 50, and 100 mA cm−2, respectively, in an alkaline solution containing HMF. Additionally, it demonstrates rapid reaction kinetics with a Tafel slope of 27.6 mV dec−1and excellent cycling stability. Importantly, the presence of more high-valent Ni3+-O species on the catalyst surface contributes to its exceptional selectivity for 2,5-furandicarboxylic acid (86.7%), Faradaic efficiency (93.1%), and conversion rate (94.4%). This catalyst provides some theoretical guidance for the development of biomass electrooxidation catalysts for sustainable energy and chemical production.
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Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 3
·123143
·
IF 7.5
Sobia Yaseen,Saddam Hussain,Sabeen Fatima,Nabi Ullah,Lu Zaijun
Photocatalysis has emerged as a promising strategy for antibiotic remediation in wastewater treatment owing to its environmentally benign nature, high efficiency, and cost-effectiveness. Herein, a PEDOT- NiCo(OH) 2 hybrid photocatalyst is successfully synthesized and, systematically investigated for visible-light-driven tetracycline (TC) degradation. Structural engineering via optimized incorporation of bimetallic hydroxide (NiCo(OH) 2 ) into the PEDOT markedly enhances the specific surface area (∼188 m 2 g −1 ) and pore size of 5.29 nm, while significantly narrowing the optical band gap to ∼1.79 eV, enabling efficient visible light harvesting. Electrochemical analyses demonstrate a substantially reduced charge-transfer resistance and an enhanced photocurrent response for PEDOT-Ni(OH) 2 2:1 (P-NCH21), indicating accelerated interfacial charge transport and suppressed electron–hole recombination. Consequently, P-NCH21 achieves an exceptional TC removal efficiency of 97.6% within 35 min under visible-light irradiation, far outperforming P-NH and PEDOT-Ni(OH) 2 3:1 (P-NCH31), having degradation efficiencies of 67 and 92%, respectively. Electron paramagnetic resonance (EPR) measurements confirm that the generation of reactive oxygen species, such as superoxide (•O 2 ⁻) and (•OH) are the reactive species that drives the photocatalytic degradation process. Furthermore, the hybrid photocatalyst exhibits excellent stability, retaining ∼96.8% of its initial activity after five consecutive cycles. This study highlights the potential of P-NCH21 as an efficient and robust photocatalyst for antibiotic remediation, providing new insights into the design of conductive polymer–based hybrid materials for environmental applications.
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JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2025
·
IF 4.9
Dadaso D. Mohite,Sachin S. Chavan,P.E. Lokhande,Syed Khasim,Taymour A. Hamdalla,Vishal Kadam,Chaitali Jagtap,Udayabhaskar Rednam
Supercapacitors (SCs) are essential components in next-generation energy storage systems due to their excellent power density and fast charge-discharge capability. However, their limited energy density continues to impede broader adoption. This study explores the electrochemical properties of electrospun polyacrylonitrile (PAN) nanofiber composites doped with nickel and cobalt hydroxide (NiCo(OH) 2 ) nanoparticles to address this challenge. The fabrication process involves electrospinning PAN solutions with NiCo(OH) 2 precursors, followed by heat treatment to enhance the structural and electrochemical properties. The crystallographic structure and morphology of the composite fibers were examined using standard characterization techniques. XPS analysis confirmed the presence of Ni 2+ , Ni 3+ , Co 2+ , and Co 3+ states, while BET analysis revealed a high surface area of 99 m 2 g -1 and mesoporous structure; TEM images confirmed uniform nanofiber morphology with embedded nanoparticles. Electrochemical testing showed that the synergistic effect of NiCo 2 O 4 /PAN carbon nanofibers improved specific capacitance, rate performance, and cycling stability, signifying progress toward advanced SCs. The highest specific capacitance achieved was 440 F g -1 at a current density of 1 A g -1 . A supercapacitor device, composed of NiCo 2 O 4 /PAN-carbon NFs//AC electrodes and a PVA/KOH gel electrolyte, demonstrated an energy density of 6 Wh kg -1 at a power density of 2000 Wk g -1 . Furthermore, it exhibited exceptional cycling stability, retaining 98% of its capacitance after 5000 cycles, highlighting its solid electrochemical reversibility, which is crucial for practical SC applications.
研究领域:
储能
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材料科学
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电化学
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纳米技术
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聚合物复合材料
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THIN SOLID FILMS
·
2020
·
IF 2.03
Chaoqun Dong,Qiuxuan Ge,Yu Li,Jiawei Zhang
Electrode materials are crucial for the electrochemical performance of supercapacitors. Thus, it is urgent to develop a satisfactory electrode material with excellent energy storage properties. Binary metal hydroxides are competitive candidates for supercapacitors. Herein, we prepared honeycomb-like NiCo(OH) 2 nanosheet arrays grown on nickel foam by a facile one-step solvothermal method. The electrochemical performance of as-prepared honeycomb-like NiCo(OH) 2 nanosheet arrays as electrode materials for supercapacitor have been evaluated. The NiCo(OH) 2 electrode exhibits higher areal capacity (267 mF cm −2 ) compared with Ni(OH) 2 (31.2 mF cm −2 ) and Co(OH) 2 (87.73 mF cm −2 ) at the current density of 20 mA cm −2 . The capacity retention can up to 83.8% after 5000 cycles. Such intriguing electrochemical performance enables it to be a potential electrode material for supercapacitors.
研究领域:
材料科学
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电化学
·
能量存储
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