APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
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IF 24.319
Jing Wang,Bingxin Guo,Junting Sun,Yingshuang Zhou,Chengfei Zhao,Zhongzhe Wei,Junjie Guo
The design and construction of electrocatalysts with multiple components to modulate the intrinsic catalytic activity is a compelling strategy to achieve Pt-like activity for hydrogen generation. Challenging on the inert Cu-based electrocatalysts for water reduction, herein, a novel and fruitful CuRu-based electrocatalysts (RuCuO x /NC) is established by combining dual-templates assembling and pyrolysis protocol with a subsequent hot-alkali corrosion. Benefitting from the synergetic effect of Cu 2+1 O (with copper excess defects) and Ru, the as-prepared RuCuO x /NC affords brilliant activity and stability under alkaline condition. In 1 M KOH, the RuCuO x /NC provides Pt-like activity with overpotential of ∼29 mV to reach 10 mA cm −2 . Theoretical calculations certified that H 2 O dissociation was accelerated and hydrogen adsorption free energy was optimized by the cooperation of Cu 2+1 O and Ru. This work proposes a promising methodology to construct multi-components electrocatalysts, which may lend perspective for the design of advanced electrocatalysts for renewable energy systems.
研究领域:
材料科学
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可再生能源
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Ran Bi,Xiaoyan Ma,Pengcheng Ma,Qianqian Wang
Non-invasive detection of body fluid glucose concentration is of great significance in the diagnosis and treatment of diabetes, which poses a new challenge to the reduction of the detection limit of glucose sensors. In this work, a novel non-enzymatic glucose sensor (defect-rich cypress-leaf-like Cu 2+1 O@NiF) was proposed by rapid electrodeposition of cypress-leaf-like Cu 2+1 O on the surface of nickel foam (NiF) substrate. Due to the high electrochemical active surface area and abundant defects of cypress-leaf-like Cu 2+1 O providing more catalytic active sites, the prepared non-enzymatic sensor has an ultra-low detection limit (0.9 nM), high sensitivity (88,419.4 μA∙mM −1 ∙cm −2 (1 nM-0.5 μM) and 2095.5 μA∙mM −1 ∙cm −2 (1 μM-4.33 mM)) and wide linear range (1 nM-4.33 mM) with good selectivity, reproducibility and stability. Furthermore, the obtained sensors exhibited high detection stability, accuracy and recovery for glucose detection of human body fluid samples, which means that the defect-rich cypress-leaf-like Cu 2+1 O@NiF electrode is an ideal candidate for non-invasive glucose sensors.
研究领域:
生物医学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Catalysts
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2025
·Vol. 15
·期 5
·491
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IF 4
Hao Yu,Shen Yan,Jiahua Zhang,Hua Wang
Electrocatalytic nitrate reduction reaction (NO3−RR) to ammonia (NH3) presents an alternative, sustainable approach to ammonia production. However, the existing catalysts suffer from poor NH3yield under lower concentrations of NO3−, and the kinetic understanding of bimetal catalysis is lacking. In this study, a Co3O4–modified Cu2+1O nanowire (CoCuNWs) catalyst with a high specific surface area was synthesized to effectively produce NH3from a 10 mM KNO3basic solution. CoCuNWs demonstrated a high NH3yield rate of 0.30 mmol h−1cm−2with an NH3Faradaic efficiency (FE) of 96.7% at −0.2 V vs. RHE, which is 1.5 times higher than the bare Cu2+1O NWs. The synergistic effect between Co3O4and Cu2+1O significantly enhanced both the nitrate conversion and ammonia yield. Importantly, it is revealed that the surface of CoCuNWs is kinetically more easily saturated with NO3−(NO2−) ions than that of Cu2+1O NWs, as evidenced by both the higher current density and the plateau occurring at higher NOx−concentrations. In addition, CoCuNWs exhibit a higher diffusion coefficient of NO3−, being 1.6 times higher than that of Cu2+1O NWs, which also indicates that the presence of Co3O4could promote the diffusion and adsorption of NO3−on CoCuNWs. Moreover, the ATR–SEIRAS analysis was applied to illustrate the reduction pathway of NO3−to NH3on CoCuNWs, which follows the formation of the key intermediate from *NO2−, *NO, *NH2OH to *NH3. This work presents a strategy for constructing dual–metal catalysts for NO3−RR and provides an insight to understand the catalysis from the perspective of the kinetics.
研究领域:
电化学
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催化材料
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
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2025
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IF 9.5
Yijun Duan,Peizhen Yang,Shuo Zhang,Qinan Song,Yameng Li,Xiang Liu,Miao Li
Electrochemical conversion of nitrate (NO3−) in wastewater to valuable ammonia (NH3) under ambient conditions is a facile and competitive route for nitrate remediation. Cu-based catalysts are competitive candidates for the nitrate reduction reaction (NO3RR) but still face low NH3 faradaic efficiency and yield rate. Herein, we report a rational design of a tandem electrode, CoFe LDH/Cu2+1O NWs, fabricated by Cu2+1O nanowires (Cu2+1O NWs) covered with CoFe-layered double hydroxide (LDH) that exhibits NH3 faradaic efficiency and yield rate as high as 95.58% and 7.01 mg h−1 cm−2, respectively, under neutral conditions at −0.79 V vs. RHE. Combined with the in situ Fourier transform infrared spectroscopy and density functional theory calculations, the mechanism of NO3RR was revealed, and the contribution of heterogeneous structures to the tandem nitrate reduction process was further explained. The NO3− was preferably reduced to *NO2 on Cu2+1O NWs, and then the heterostructure CoFe LDH was associated with the combination of *H and intermediates which advanced the production of NH3. This work offers a new paradigm for constructing efficient, stable, and energy conservation transition metal composited electrocatalysts in the NO3RR.
研究领域:
电化学
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环境修复
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催化
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纳米材料
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能量转换
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
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2024
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IF 4.7
Jiahua Zhang,Dong Xu,Dongsheng Lu,Hua Wang
Construction the electrocatalysts with multiple components is an effective strategy to enhance the activity for NH 3 generation in electrocatalytic nitrate reduction reaction (NITRR). Herein, we report a high performance electrocatalyst Co 3 O 4 -Cu 2+1 O/CF. The obtained Co 3 O 4 -Cu 2+1 O/CF nanosheets not only provide large active surface area but also construct the bimetal oxides interface for exerting Cu-Co tandem catalysis. Meanwhile, Co 3 O 4 -Cu 2+1 O/CF exhibits a maximum NH 3 -Faradaic efficiency of 96.5% and NH 3 yield of 0.26 mmol h −1 cm −2 in neutral solution with 10 mM NO 3 - . The control experiments and Tafel analysis clearly manifest the tandem catalysis mechanism on Co 3 O 4 -Cu 2+1 O/CF, where Cu 2+1 O favors the NO 3 - conversion to NO 2 - , while Co 3 O 4 selectively promotes NO 2 - conversion to NH 3 . The DFT calculations reveal that the strengthened NO 3 - adsorption and the enhanced adsorption of H* on Co 3 O 4 -Cu 2+1 O/CF jointly promote the selective formation of ammonia from NO 3 - reduction. This work provides the strategy of constructing the efficient transition metal composited electrocatalysts in NITRR.
研究领域:
化学
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材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Yiping Qiu,Xingyue Wu,Junyao Li,Zheng-Zhi Yin,Yong Qin,Yong Kong
In situ growth of Cu 2+1 O/Cu 2 (CO 3 )(OH) 2 /Co(OH) 2 on carbon cloth (CC) is achieved via a facile wet chemical oxidation strategy combined with hydrothermal method , and the self-supported Cu 2+1 O/Cu 2 (CO 3 )(OH) 2 /Co(OH) 2 displays a unique multi-dimensional hybrid structure. Cu 2+1 O (CuO with excess metal defects) electroless plated on the surface of CC can not only retain the nanostructures of Cu 2 (CO 3 )(OH) 2 and Co(OH) 2 , but also act as the buffer layer to ease volumetric expansion of the materials during the repeated charge/discharge process. When the CC@Cu 2+1 O/Cu 2 (CO 3 )(OH) 2 /Co(OH) 2 is used in flexible supercapacitors , it exhibits significantly enhanced areal specific capacitance (624.5 mF cm 2 at 0.5 mA cm 2 ), rate capability (86.6 %), cyclic stability (100.3 % retention after 1500 cycles) and coulombic efficiency (99.3 % retention after 1500 cycles) due to the synergistic effect of Cu 2+1 O buffer layer, two-dimensional (2D) Co(OH) 2 nanosheets and three-dimensional (3D) Cu 2 (CO 3 )(OH) 2 nanoblocks.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
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