INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Kang Ge,Yanwei Zeng,Guodian Dong,Longfei Zhao,Zhentao Wang,Ming Huang
The growing hydrogen consumption has greatly promoted the development of efficient, stable and low-cost electrocatalysts for the hydrogen evolution reaction (HER). Constructing functional nanostructures is an efficacious strategy to optimize catalytic performance. Herein, we present a feasible route to fabricate distinctive 3D grass-like cobalt phosphide nanocones clad with mini-vesicles on the hierarchically porous Ni foam, which can directly serve as a binder-free electrocatalyst with superior catalytic activity and durability in HER. Thanks to its distinctive 3D microstructure featured with favourable pore-size distribution, abundant active sites provided by mini-vesicles and rapid electron transfer with the assistance of Ni foam, the as-grown grass-like CoP/NF electrocatalyst has shown a favourable overpotential in an acidic solution with an onset overpotential of ∼35 mV, an overpotential of 71 mV at a current density of 10 mA cm −2 , reduced by 60 mV in comparison with that realized by urchin-like CoP/NF nanoprickles. Moreover, it has exhibited an excellent HER activity in the alkaline medium , with an overpotential of 117 mV at 10 mA cm −2 , a Tafel slope of 63.0 mV dec −1 and a long-term electrochemical durability.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2019
·Vol. 6
·期 7
·1744-1752
·
IF 5.934
Ruinan Qin,Hao Wan,Xiaohe Liu,Gen Chen,Ning Zhang,Renzhi Ma,Guanzhou Qiu
Due to the low cost, abundant reserves and redox-active features, electrocatalysts based on 3d transition metals have been thoroughly evaluated and are considered promising candidates to the current commercial noble metal-based materials. Designing elaborate structures and favorable phase composition is regarded as effective to improve the activity in electrocatalysis. Herein, three kinds of layered cobalt hydroxide nanocones (NCs) with tunable interlayer spacing determined by the intercalated anion species were prepared. Because of the larger interlayer spacing which might be beneficial for faster mass transfer, dodecyl sulfate (DS−) ion-intercalated layered cobalt hydroxide NCs yielded current densities of 5 and 10.65 mA cm−2 at overpotentials of 0.50 and 0.57 V, respectively, in the electrolytic oxygen evolution reaction (OER) in a neutral phosphate buffer solution (PBS); thus, they surpassed their counterparts with decreased layer distances induced by intercalated acetate (CH3COO−) or nitrate (NO3−) anions. When a further phosphidation treatment was adopted on NO3−-intercalated cobalt hydroxide NCs, a cobalt phosphide (CoP) product with well-maintained conical morphology was obtained, which reduced the overpotential of ∼20 mV to reach the anodic exchange current density of 5 mA cm−2. The activity enhancement induced by the tuning of interlayer spacing and phosphidation offers great promise for developing high-activity catalysts by rationally designing phase structure and composition for electrochemical energy conversion.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Xiangsen Xu,Fengye Lyu,Jiahao Chen,Yiqing Zeng,Zhaoxiang Zhong,Feng Zhang,Weihong Xing
In this work, TiO 2 nanocones grown on SiC membrane was used as the support of V 2 O 5 -WO 3 species to prepare V 2 O 5 -WO 3 /TiO 2 @SiC (VWTi(C-X)@SiC) catalytic membrane for dust filtration and NH 3 -SCR denitration. On account of the large specific surface area, abundant surface acid sites and prominent redox property, the optimized VWTi(C-550)@SiC catalytic membrane shows >90% NO removal efficiency at the temperature of 280–360 °C, which are much higher than VWTi(P-550)/SiC catalytic membrane (TiO 2 nanoparticles prepared by traditional vacuum coating titanium sol method was used as the support of V 2 O 5 -WO 3 species, NO conversion <80% at whole tested temperature). Additionally, VWTi(C-550)@SiC displays superior stability during the SO 2 + H 2 O resistance and 300 h long-term test at 300 °C, and exhibits an excellent dust filtration performance (2.5 μm SiO 2 particles interception rate exceeded 99.99%) under all test conditions. More importantly, the structure of nanocones decrease the influence of tensile stresses due to the different thermal expansion coefficients of TiO 2 and SiC membranes, which significantly suppress the fall of VWTi catalyst layer from the surface of SiC during pulse-jet cleaning. Among above results, it can be concluded that the optimized VWTi(C-550)@SiC catalytic membrane shows a prosperous application prospect for the simultaneously dust filtration and NH 3 -SCR denitration of medium–high temperature flue gas .
研究领域:
环境科学
·
催化材料
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
Analytical Methods
·
2018
·Vol. 10
·期 26
·3170-3177
·
IF 2.073
Fugang Xu,Huasheng Lai,Hui Xu
An efficient SERS substrate composed of gold nanocone arrays with abundant sharp tips directly grown on 3D porous Ni foam (AuNCA@Ni foam) was developed for sensitive detection of aromatic dyes. The AuNCA@Ni foam was prepared by a facile galvanic replacement reaction between Ni foam and HAuCl4 in the presence of cetyltrimethylammonium bromide (CTAB). The concentration of CTAB played an important role in determining the morphology of the product. Without CTAB or replacing CTAB with other surfactants, no AuNCA could be obtained. Thanks to the abundant uniform sharp tips and 3D porous structure, the AuNCA@Ni foam displayed much stronger SERS enhancement ability and higher reproducibility for aromatic dye detection compared with substrates prepared in the absence of CTAB or in the presence of other surfactants. Moreover, the AuNCA@Ni foam with the robust integrated structure also avoided the tedious operation of assembly and centrifugation. The SERS application of the AuNCA@Ni foam was tested by the detection of aromatic dyes crystal violet (CV) and Nile blue (NB), which achieved a detection limit (LOD) of 0.03 nM and 0.5 nM in standard solution, respectively, and an LOD of 3 nM for determining CV in real water samples.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2023
·
IF 5.4
Yuxin Wang,Gaofeng Zhang,Zhen He,Jiahuan Chen,Wei Gao,Peng Cao
This study investigated the electrodeposition of a three-dimensional nanocone-shaped surface structure on SUS304 stainless steel substrates. Different electrodeposition parameters were adopted to generate nanocone-shaped Ni coatings. A detailed description of the coating microstructure and composition is proposed to understand how Ni nanocones develop throughout electrodeposition. A series of wetting tests compared the superhydrophobicity of the Ni nanocone coating. Wear tests were used to verify their mechanical stability. The best superhydrophobic and mechanical performance is achieved after 25 min electrodeposition, where the newly formed Ni nanocones grow to provide additional air cushion to support surface water droplets and promote wear resistance. The superhydrophobic Ni coating also has good anti-icing properties. Water droplets begin to freeze from the contact points between the water and the sample surface. Surface damage, such as scratches and holes, reduces superhydrophobic samples' anti-icing properties.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2023
·Vol. 34
·期 21
·215706
·
IF 3.5
Zizhen Gong,Qinglin Han,Hongyu Wang,Kai Zhang,Yanzhou Qin,Zhaoyang Tan,Guihua Liu
The development of high efficiency oxygen evolution electrocatalyst is of great significance for water splitting reaction. Herein, an efficient cone-structured NiFe-LDH/Nicone/Ti catalyst is fabricated by electrodeposition method towards enhanced oxygen evolution reaction (OER). The featured tip curvature of nanocone structure can accelerate the reaction kinetics of OER by offering a field-enhanced aggregation of local hydroxide ion reactant on the catalyst surface, and thus improves the performance of the NiFe catalyst. Accordingly, NiFe-LDH/Nicone/Ti requires only a low overpotential of 292 mV to achieve 50 mA cm−2, and with high stability under continuous high-current operations. In addition, the alkali-electrolyzer using NiFe-LDH/Nicone/Ti electrode exhibits good performance with a voltage of 1.73 V at 50 mA cm−2 and displays excellent stability in long-term stability test. This cone-structured catalyst design with field-enhanced local hydroxide ion aggregation effect provides a promising method for the development of highly active OER electrocatalysts.
研究领域:
材料科学
·
电化学
·
可再生能源
✓ 已验证
DOI
高影响因子
Frontiers of Materials Science
·
2019
·Vol. 13
·期 1
·43-53
·
IF 1.701
Wu Pengcheng,Liu Chang,Luo Yan,Wu Keliang,Wu Jianning,Guo Xuhong,Hou Juan,Liu Zhiyong
ZnO nanocone arrays (NCAs) decorated with black TiO 2 nanoparticles (B-TiO 2 NPs) were uniformly anchored on the surface of carbon cloth (CC) directly by a simply electrochemical deposition method. Thus a novel B-TiO 2 NPs/ZnO NCAs-CC hierarchical heterostructure was formed. It displayed superior performance and achieved a higher photocurrent over 0.4 mA$cm -2 before the onset of the dark current, attributed to the separation of the photogenerated electron-hole pair. Based on the B-TiO 2 NPs/ZnO NCAs-CC heterostructure, the catalyst was fabricated for promoting the separation of charge carriers. Moreover, the introduction of Ti 3+ and oxygen vacancies on the surface of TiO 2 NPs expanded the absorption band edge and enhanced the electrical conductivity as well as the charge transportation on the catalytic surface. It indicates that the B-TiO 2 NPs/ZnO NCAs-CC composite is beneficial to the improvement of the photoelectrochemical (PEC) activity.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2016
·
IF 2.267
Zhengnan Zhou,Weiping Li,Tianrui He,Peng Yu,Guoxin Tan,Chengyun Ning
In this research, polypyrrole nanocone arrays doped with β-Naphthalene sulphonic acid (PPy-NSA) were built. This film was expected to control protein adsorption and bacterial adhesion by potential-induced reversibly redox. The scanning Kelvin probe microscopy (SKPM) and surface contact angles (SCA) tests suggested that the surface potential and wettability of PPy-NSA nanocone arrays could be controlled by simply controlling its redox property via applying potential. The controllable surface potential and wettability in return controlled the adsorption of protein and adhesion of bacteria. The proposed material might find application in the preparation of smart biomaterial surfaces that can regulate proteins and bacterial adhesion by a simple potential switching.
研究领域:
生物材料
·
生物医学工程
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Dan Wang,Hanlin Wang,Juanjuan Fan,Hancheng Zhu,Akira Fujishima,Xintong Zhang
Photoelectrochemical (PEC) performance of photoanode is limited by the cascade-dynamic processes, mainly including light absorption , charge separation, and surface reaction. This work adopted a strategy of nanocones modification on FTO substrate (FTO-NC) to enhance light utilization and photoelectrons collection for improved PEC water splitting . Comparative studies showed that FTO-NC enhanced the light scattering, promoting the conversion process of photon to electron/hole and enlarging the effective surface area of BiVO 4 for surface reaction. Meanwhile, cooperative Mo-doping and Co-MOF decoration improved the bulk electron transportation in BiVO 4 , hole migration towards the electrode surface , and accelerated the water oxidation reaction of photogenerated holes. The photocurrent density of FTO-NC/BiVO 4 -Mo/MOFs reached 3.56 mA cm −2 , 6.14 times that of pristine BiVO 4 . The IPCE of FTO-NC/BiVO 4 -Mo/MOFs photoanode achieve 60% at 1.23 V vs. RHE, demonstrating a significantly enhanced light utilization performance. This work presents new insight into boosting cascade-dynamic processes through collaborative strategies for highly efficient PEC water-splitting.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES COMMUNICATIONS
·
2025
·
IF 7.7
Yina Zhuge,Haipei Ge,Fujuan Liu
Inspired by the extraordinary hierarchical architecture of penguins’ feathers, we have successfully prepared the biomimetic hierarchical fiber membranes. This was achieved by depositing rutile TiO 2 featuring nanocone structures on both the upper and lower surfaces of porous/membrane-pore-like fiber membranes using the chemical bath deposition method. When contrasted with conventional insulating materials (pure wool felt, twill cotton fabric, aramid 1313, polyethylene foam cotton and asbestos cloth), the novel hierarchical fiber membranes display outstanding thermal insulation capabilities (thermal conductivity = 0.0189 W m −1 K −1 ), remarkable high temperature resistance (more than 50 % of material remaining at 700 °C), excellent flame retardancy, and hydrophobicity (water contact angle exceeding 140°). These exceptional characteristics suggest that the hierarchically structured fiber membranes hold great promise for underwater thermal insulation applications, heralding the entry of the development of advanced thermal insulation materials into a new stage.
研究领域:
材料科学
·
生物仿生学
✓ 已验证
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2021
·
IF 4.098
Zhongshun Wang,Qunyan Zhu,Yalei Wang,Shuzhen Dou,Qiye Chen,Nan Lu
Super-hydrophobic delivery (SHD) is an efficient approach to enrich trace analytes into hot spot regions for ultrasensitive surface-enhanced Raman scattering (SERS) detection. In this article, we propose an efficient and simple method to prepare a highly-uniform SHD-SERS platform of high performance in trace detection, named as “silver-nanoparticle-grafted silicon nanocones” (termed AgNPs/SiNC) platform. It is fabricated via droplet-confined electroless deposition on the super-hydrophobic SiNC array. The AgNPs/SiNC platform allows trace analytes enriched into hot spots formed by AgNPs, leading to an excellent reproducibility and sensitivity. The relative standard deviation (RSD) for detecting R6G (10 −7 M) is down to 4.70% and the lowest detection concentration for R6G is 10 −14 M. Moreover, various contaminants in complex liquid environments, such as, crystal violet (10 −9 M) in lake water, melamine (10 −7 M) in liquid milk and methyl parathion (10 −7 M) in tap water, can be detected using the SERS platform. This result demonstrates the great potential of the AgNPs/SiNC platform in the fields of food safety and environmental monitoring.
研究领域:
材料科学
·
环境科学
·
食品安全
✓ 已验证
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Wangsheng Xu,Haoming Bao,Hongwen Zhang,Hao Fu,Qian Zhao,Yue Li,Weiping Cai
Surface Enhanced Raman Spectroscopy (SERS) could be a powerful technique for detecting trace gaseous sulfur-mustard, but it is still challenging due to the difficulty in efficiently capturing sulfur-mustard molecules by normal SERS substrates. Here, a chemically trapping strategy is presented for such detection via coating an ultrathin metal-oxide sensing layer on a SERS substrate. In the strategy, a SERS substrate Au-wrapped Si nanocone array is designed and fabricated by Si wafer-based organic template-etching and appropriate Au deposition, and coated with an ultrathin CuO for chemically capturing sulfur-mustard molecules. The validity of such strategy has been demonstrated via taking the gaseous 2-chloroethyl ethyl sulfide (a simulant of sulfur-mustard, or 2-CEES for short) as the target molecules. The response of the CuO-coated SERS substrate to the gaseous 2-CEES is detectable within 10 min, and the lowest detectable concentration is 10 ppb or less. Further experiments have shown that there exists an optimal CuO coating thickness which is about 6 nm. The CuO coating-based capture of 2-CEES molecules is attributed to the surface hydroxyl-induced specific adsorption, which is subject to the pseudo-second-order kinetics and Freundlich-typed model. This study presents the practical SERS chips and new route for the trace detection of gaseous sulfur-mustard.
研究领域:
化学
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）