Arabian Journal of Chemistry
·
2023
·
IF 6
Yongjun Shen,Yin Chen,Shuaikang Fang,Jae Kwang Park,Kun Feng
To solve the current energy and environmental dilemma, hydrogen energy is considered to be the best clean energy source to replace traditional fossil fuels. Water electrolysis as the main technology for hydrogen production has been affected by two half-reactions, making it difficult to improve the yield. To solve this problem, the development of inexpensive and efficient bifunctional electrocatalysts is the focus of current research. CuCo 2 S 4 /NF(Ni foam) nanowires are synthesized using a mild hydrothermal process and were later placed in a plasma reactor. Application of the voltage triggers a chemical reaction between the microdischarge wires and the sample. This leads to a change in the physical morphology of the catalyst and an improvement in its catalytic performance. The morphological characterization results show that the catalyst modification generates a distinct flower-like nanowire structure, which helps in the solid attachment of the catalyst to the nickel foam surface. The plasma-modified CuCo 2 S 4 /Ni foam (PA@CuCo 2 S 4 /NF) exhibits low overpotentials of hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline solutions. Additionally, the Tafel slopes of the HER and OER are 85.9 mVdec −1 and 142.7 mVdec −1 , respectively, indicating optimal reaction kinetics. A cell voltage of only 1.55 V is required to provide a 10 mA cm −2 current during water splitting. This study validates the feasibility of using plasma technology to create high-performance electrocatalysts.
研究领域:
材料科学
·
能源化学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2024
·
IF 5.5
Liang Ding,Roujia Zhang,Peng Zhao,Changsheng Qu
Based on the remediation challenges and practical needs of trichloroethylene (TCE)-contaminated groundwater, this study prepared an Ni-based composite electrode, Pd/Ni(OH) 2 /Ni foam (NF), and evaluates its electrocatalytic degradation effect on TCE in a groundwater environment. Under an applied voltage of –1.3 V versus Ag/AgCl, the TCE removal rate reaches 95% after 3 h of electrolysis. The introduction of Ni(OH) 2 nanoarrays accelerates the electron transport process, shortens the ion transport distance, and significantly increases the electron density of Pd. Furthermore, TCE is rapidly reduced by adsorbed hydrogen radicals on the Pd surface, and the ethane conversion rate reaches 62%. The experimental results show that the electrode can maintain a strong electrocatalytic activity over a wide pH range (3–9) and that it is not affected by common anions, such as Ca 2+ , HCO 3 - , SO 3 2- , or Cl - , in groundwater. Pd/Ni(OH) 2 /NF exhibits a high reactivity after six cycles of use. The remediation mechanism is studied by combining the microscopic characterization of materials, electrochemical activity testing, and process product identification, which provides an effective way of completely degrading chlorinated hydrocarbon pollutants in natural groundwater environment.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2020
·
IF 7.864
Ruiyang Zhang,Tao Ran,Yuehan Cao,Qian Zhang,Fan Dong,Guidong Yang,Ying Zhou
Catalysis oxidization has been known to be an effective technique in environmental remediation. However, low efficiency for oxygen activation and difficult recovery of the catalysts in powdery form significantly limit the practical application. In this work, a new-type monolithic α-Ni(OH)2/Ni-foam was fabricated by the hydrothermal process. We found that H atoms of α-Ni(OH)2 can significantly promote oxygen activation, which endows it with favorable NO and NO2 oxidization confirmed by theoretical calculation and in situ DRIFTS. Furthermore, the introduction of Ni foam accelerated the pollutant gas transfer and charge carriers’ separation because of its abundant porous structure and high conductivity and its monolithic property simplified the recycling operation. Consequently, the obtained α-Ni(OH)2/Ni-foam achieved an excellent NO oxidation (69.0%) and no toxic NO2 was detected under visible light illumination (λ > 420 nm), indicating its highly promising potential in environmental remediation. Our work provides a conceptually different fresh perception to promote oxygen activation for highly efficient gas purification.
研究领域:
环境科学
·
催化材料
·
理论计算
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Chun Tang,Zhi Liang Zhao,Jie Chen,Bo Li,Liang Chen,Chang Ming Li
The direct urea fuel cell holds great promise for energy-sustainable developments and mitigating water contamination but it still faces a great challenge to overcome the sluggish kinetics of the urea oxidation reaction (UOR). In this work, we report Se-Ni(OH) 2 -shelled vertically oriented NiSe nanowires on a Ni foam as an electrocatalyst toward UOR, showing a low potential of 0.366 V vs. SCE to drive 100 mA cm −2 in alkaline solution and out-performing all the reported non-noble-metal UOR catalysts up to date. Experimental results and theoretical calculation reveal that the vertically and distantly arranged nanowires with highly porous structure produce high mass transport paths for urea to fully access the reaction sites, the NiSe core offers high conductivity for fast electron transport , and the Se-Ni(OH) 2 shell provides large amount of active catalytic sites while lowering the CO 2 adsorption/desorption barrier than Ni(OH) 2 for fast reaction kinetics. This work opens up an exciting new direction to design electrocatalysts for high performance fuel cells and other energy applications.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Shuang Xue,Tian Lan,Guofeng Zhao,Qiang Nie,Chao Meng,Xinyi Xu,Yong Lu
Water gas shift reaction (WGSR) is urgently calling for an alternative to the Fe-Cr catalyst. Ni-based catalysts are taken into consideration but remain challenging because of their high methanation activity. Here we report a highly active and selective NiC x /Ni-foam catalyst with clearly detectable Ni 3 C phase, facilely obtainable by endogenous growth of NiC 2 O 4 onto a Ni-foam and subsequent H 2 -reduction treatment. The preferred catalyst with high content of NiC x is capable of converting 63.6% or 94.3% CO at 350 °C or 400 °C with trace or < 0.8% CH 4 formation for a feed gas with H 2 O/CO/Ar molar ratio of 4/1/9, and is stable for at least 110 h. It is experimentally and theoretically unveiled that the Ni 3 C facilitates the dissociative activation of H 2 O and favors CO to form carboxylate species (favorable for CO 2 formation) rather than active Ni(CO) n intermediates for CH 4 formation thereby enabling the catalyst with high WGSR activity and selectivity.
研究领域:
化学工程
·
催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Xincheng Jiang,Junyi Jiang,Guoyou Huo,Jiaxi Guo,Qiquan Zheng,Hong Li,Huaili Zheng
Effectively removing both soluble antibiotics and insoluble oils from wastewater is a significant challenge. To address both the problems, we synthesized a three-dimensional (3D) porous water treatment material. It can be converted from antibiotic removal mode to oil removal mode by simple surface performance regulation. This approach achieved a high removal rate for ciprofloxacin (CIP) and good separation efficiency for oil/water mixtures. Initially, Co 2 CO 3 (OH) 2 nano-needles were fixed on Ni foam to synthesize Co 2 CO 3 (OH) 2 @Ni foam-1, which had a high CIP removal rate (93.59 % at pH 7.0) and a certain anti-interference ability. To assess the CIP removal performance, the environmental impact, economic benefit and energy consumption (3E) triangle model was established and the optimal operating point was selected. Characterization experiments demonstrated that the removal of CIP was attributed to the mechanisms of surface complexation, electrostatic attraction, cation bridging, precipitation and flocculation . Subsequently, Co 2 CO 3 (OH) 2 @Ni foam-2 was obtained by hydrophobic modification, which exhibited separation efficiencies above 93.5 % for a series of different oil/water mixtures. Co 2 CO 3 (OH) 2 @Ni foam series materials are easy to prepare and possess effective pollutants treatment efficiency, thus providing a new strategy for developing multi-functional water treatment materials and a novel approach for the treatment of soluble antibiotics and insoluble oils in wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Zimo Lou,Jiasheng Zhou,Mei Sun,Jiang Xu,Kunlun Yang,Dan Lv,Yaping Zhao,Xinhua Xu
A Pd/MnO 2 /Ni foam electrode with hierarchical structure was synthesized via electrodeposition for efficient electrocatalytic hydrodechlorination. Compared with the ordinary Pd/Ni foam electrode, the introduction of MnO 2 greatly enhanced the catalytic reactivity and reduced the dose of precious metal Pd. Only a quarter of Pd was required for the Pd/MnO 2 /Ni foam compared to the Pd/Ni electrode to achieve complete dechlorination of 2,4-dichlorobenzoic acid (2,4-DCBA) within 120 min. Various characterizations suggested that MnO 2 covered the surface of the Ni foam and increased the specific surface area of the electrode, while Pd nanoparticles were subsequently deposited on MnO 2 . The atomic H ∗ -based indirect dechlorination was the dominant pathway while only approximately 13% of 2,4-DCBA was removed by direct electron transfer. Atomic H ∗ adsorbed on Pd acted as the key active species for the dechlorination of 2,4-DCBA by the Pd/MnO 2 /Ni foam electrode in this study. The introduction of MnO 2 would promote the water dissociation and the hydrogen evolution reaction, and provide Pd with more atomic H ∗ . Pd/MnO 2 /Ni foam exhibited good stability and reusability according to the XPS spectra and consecutive electrocatalytic experiments, which suggested its long-term potential for efficient removal of chlorinated contaminants. This work demonstrated a new strategy to design efficient electrocatalysts with less precious metal.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2017
·
IF 4.162
Qi Wang,Qian Zhou,Qicheng Zhang,Rongjia Shi,Shangshang Ma,Wenbo Zhao,Min Zhou
Preparation of high performance electrochemical biosensing interface for the sensitive and rapid detection of human metabolites is of great interest for health care and biomedical science. In this paper, based on the adhesion technique of marine mussels, we designed and prepared a novel biosensor with a micro/nano-biointerface of Fe 3 O 4 -Mn 3 (PO 3 ) 2 @Ni foam, which offered a three dimensional (3D) living environment for real cell. The constructed biosensor with a 3D micro/nano-biointerface of Fe 3 O 4 -Mn 3 (PO 3 ) 2 @Ni foam was characterized by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and elemental mapping. Furthermore, the electrochemical experiments by electrochemical method for detection of superoxide anion (O 2 •− ) in situ released by cells were carried out by this biosensor we proposed. Results indicated that the 3D interface of mussel-inspired Fe 3 O 4 -Mn 3 (PO 3 ) 2 @Ni foam offered an amicable platform for promoting cell adhesion, which was beneficial for enhancing biosensing activity. This proposed sensing platform provided high electroactivity and excellent electron transport with a lower detection limit (0.0170 μM), wider linear range 0.04–2.44 μM) and short diffusion distance to reaction sites. The case achieved the accurate detection of O 2 •− (in situ released by cells) based on the combination of mussel-inspired biomimetic adhesion technique, 3D micro/nano-biointerface construction and electrochemical biosensing technique.
研究领域:
生物医学工程
·
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2021
·
IF 4.539
Yumeng Lian,Yi Wang,Dun Zhang,Likun Xu
Developing a stable and reusable material for antibacterial application in an enzyme-like system is still a challenge. Herein, Mn–Co–S–Se (MnCo 2 S x Se 4–x )/Ni foam (NF) are synthesized by introducing S 2– and Se 2– in MnCo 2 O 4 /NF with a facile hydrothermal approach. With the different molar ratios of S/Se, the surface morphology of MnCo 2 S x Se 4–x /NF shows different growth and the catalytic activity also presents regular changes. MnCo 2 S 3.1 Se 0.9 /NF possesses a high enzyme-like ability with higher V max than natural horseradish peroxidase . Due to the outstanding peroxidase-like activity, MnCo 2 S 3.1 Se 0.9 /NF also exhibits broad-spectrum bactericidal performance towards Escherichia coli and Staphylococcus aureus which stems from the formation of ·O 2 – from H 2 O 2 . In the reutilization experiment, the enzyme-like activity keeps a stable value after 25 cyclic tests and the bactericidal performance is still stable after 10 cyclic tests, proving that MnCo 2 S 3.1 Se 0.9 /NF possesses relative stability and reusability. This research showed the great prospect of new energy and environmental catalysis.
研究领域:
生物材料学
·
环境催化
·
纳米酶研究
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Liubo Liang,Tonghua Wu,Xiaohan Mei,Yu Bai,Chunqi Guo,Yanchao Yang,Guibin Wang,Shuling Zhang,Jianxin Mu
In order to minimize electromagnetic pollution from secondary radiation, the porous and asymmetric polyetheretherketone(PEEK)-based foam with low reflectivity and high electromagnetic interference shielding effectiveness was successfully fabricated by Schiff base reversible reaction, combined with non-solvent induced phase separation (NIPS) and electroless plating. Soluble ketimine-PEEK was chosen as a precursor to match NIPS method to acquire oriented finger pores for improving impedance matching. Acidic reduction process from ketimine-PEEK to PEEK restored the crystallinity of the resin matrix. Electroless nickel plating on the unilateral surface constructed the asymmetric structure to improve electromagnetic shielding efficiency. By controlling the content of conductive filler and propagation path of incident electromagnetic waves, MWCNT-COOH/PEEK/Ni (MPN) foam with absorption-dominated shielding mechanism exhibited high electromagnetic shielding efficiency of 63.94 dB and low reflection characteristics ( R = 0.14), which means the foam shielded 99.9999 % of the electromagnetic waves under the circumstance of reflecting 14 % of the electromagnetic waves only. Due to the crystalline nature of the foam, MPN foam exhibited the remarkable compressive strength up to 2.05 MPa at 10 % strain and the shielding stability under harsh conditions such as medium immersion and high-temperature (320 °C) treatments. The MPN foam was expected to provide reliable electromagnetic protection for electrical devices in harsh service environments.
研究领域:
材料科学
·
电磁兼容性
·
高分子科学
·
纳米技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Yu Cheng,Haoran Guo,Pengfei Yuan,Xinpan Li,Lirong Zheng,Rui Song
To satisfy the practical requirements of electrochemical water splitting, developing a flexible, effective and sustainable approach for scalable production of bifunctional electrocatalyst for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is a tremendous issue to be rationally addressed. Herein, a solid-state diffusion strategy with Ni foam and N-doped carbon layers is applied to prepare multi-interfacial, self-supported and N-doped carbon nanotube (NCNT) encapsulated Ni nanoparticles (NPs) array bifunctional electrocatalyst (NCNT-NP@NF). Prominently, this NCNT-NP@NF is scalable to meet the application requirements and can be used as a binder-free electrode for direct the water splitting. The optimal sample demonstrate outstanding HER/OER performance in 1.0 M KOH, with low overpotential ( η 10 ) at 10 mA cm −2 during HER (96.1 mV) and OER (240 mV) process, which is extremely superior to the most reported metal-based electrocatalysts and even better than commercial IrO 2 (400 mV at 10 mA cm −2 for OER). Strikingly, when these bifunctional electrocatalysts are employed in a dual-electrode electrolyzer for water splitting, the NCNT-NP@NF only needs cell voltage of 1.54 V to drive overall water splitting in 1.0 M KOH, and displays excellent long-term stability (150 h for water splitting). Moreover, experiments combined with density functional theory (DFT) calculations clarify that the remarkable electrochemical activity and stability are mainly attribute to the synergistic effect of the uniform distribution of Ni NPs, heteroatomic doping, as well as district confinement effect of NCNT leading to enhanced electronic multi-interfacial transmission, all these factors co-accelerate electrocatalytic kinetics. Accordingly, this solid-state diffusion method possesses a favorable potential to construct a multi-interfacial and self-supported electrocatalysts in the fields of sustainable supply of clean energies.
研究领域:
电化学
·
材料科学
·
催化
·
能源材料
·
可持续能源
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）