CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Xin Fan,Dayi Zhou,Yaqi Chen,Xinjian Li,Shan Gao,Wenting Ji,Yuewen Zhang,Qi Chen,Hongan Ma,Xiaopeng Jia
Compared to Te, Ni is found in abundance in the earth's crust. At the same time, the mechanical properties of Ni atom-substituted skutterudite are significantly improved. In this study, a series of S-filled Ni-substituted skutterudite compounds were synthesized by a high-pressure and high-temperature (HPHT) method in the synthesis pressure range of 1.0–3.0 GPa. The phase composition, microscopic morphology, and electrothermal transmission properties of the S x Co 3.6 Ni 0.4 Sb 12 ( x = 0, 0.05, 0.10, 0.20) samples were systematically characterized. Phase composition analysis showed that the introduction of S atoms into the intrinsic pores of skutterudite can improve the solid solution limit of Ni atoms in the Co sites of skutterudite. The filling limit of S increased with the synthetic pressure. Moreover, microscopic morphology analysis revealed that the filling of S atoms inhibited the growth of grains. A large number of lattice fringes in different directions were found in the sample, containing abundant microstructures such as lattice distortions and dislocation defects. Compared with the synthesized samples, S 0.05 Co 3.6 Ni 0.4 Sb 12 synthesized at 1.0 GPa had a maximum room temperature power factor of 7.98 × 10 −4 Wm −1 K −2 . The electrical properties of S 0.05 Co 3.6 Ni 0.4 Sb 12 samples stored for 6 months without any protective measures were tested at room temperature. No obvious changes in performance were observed, which proved that the HPHT method can synthesize stable samples. After several thermal cycles, the electrical properties of the S 0.05 Co 3.6 Ni 0.4 Sb 12 sample was tested for variable temperature, and it was found that the sample still had good stability. How the substitution of S atoms with Ni atoms reduces the lattice thermal conductivity can be explained by fitting the Callaway model. The S 0.05 Co 3.6 Ni 0.4 Sb 12 sample synthesized at 1.0 GPa had a maximum zT value of 0.46 at the test temperature of 773 K, which decreased to 0.43 after multiple thermal cycles at the same temperature.
✓ 已验证
产品关联
DOI
高影响因子
Journal of Analysis and Testing
·
2022
·Vol. 7
·期 2
·157-162
·
IF 0
Gao Su,Ye Ming-Liang,Ma Rui,Liu Ai-Rong,Gao Hong-Wen
Based on the Mg 2 + complexation with acid chrome blue K (ACBK) at pH 10.2, an automatic system was designed to determine total hardness of water. The system consists of a vector colorimeter, a multi-channel sampling pump and both reagents A and B. Two kinds of reagent solutions were prepared and used in this system, i.e., ammoniacal buffer and ACBK—disodium magnesium EDTA solutions. The experimental results of the standard solutions containing 2 and 3 mg/L of total hardness showed that the relative standard deviations (RSDs) were 1.9% and 2.2%, respectively, and the limit of detection (LOD) was only 0.035 mg/L. The detection of four natural water samples showed that the recoveries were between 85.0% and 108.6%, consistent with those obtained by ICP-AES method.
✓ 已验证
产品关联
DOI
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Qiulin Li,Ke Zhang,Xiang Li,Jiaqi He,Yongbing Lou,Jinxi Chen
The creation of considerably effective electrocatalysts to reduce overpotentials is essential for speeding up the sluggish oxygen evolution reaction (OER) processes, which is imperatively required for the practical exploitation of electrochemical water-splitting. Herein, we prepared a unique composite structure, uniformly spherical Ni-MOF decorated with NiMoO 4 nanorods on Ni foam (NF), and assessed its performance toward oxygen evolution reaction. The synergistic effect between NiMoO 4 and Ni-MOF remarkably promoted the OER intrinsic activity. Moreover, introducing NiMoO 4 endowed the composite structure with enhanced electrical conductivity and exposed more active sites. The NiMoO 4 /Ni-MOF/NF electrode exhibited exceptional electrocatalytic activity in 1.0 M KOH aqueous solution, with a low overpotential of 218 mV to drive the current density of 10 mA cm −2 and a low Tafel slope (67.75 mV dec −1 ), surpassing the benchmark RuO 2 . The presented strategy opens a promising candidate for preparing novel non-precious metal OER electrocatalysts derived from MOF materials for sustainable energy applications.
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHARACTERIZATION
·
2022
·
IF 4.537
Yang Yu,Xiaoping Cai,Zhejian Cao,Xinyang Jiao,Weining Xie,Yong Yu,Peizhong Feng
Porous NiAl intermetallic compounds demonstrate great potential in various applications by their high porosity and excellent oxidation resistance . However, to obtain a controllable NiAl intermetallic structure by tuning different process parameters remains unclear. In this work, porous NiAl intermetallic compounds were fabricated by economic and energy-saving thermal explosion (TE) reaction. The relationship between microstructure and process parameters was revealed using three-dimensional X-ray microscopy (3D-XRM) with high resolution and non-destructive characteristics. The geometrical features and quantitative statistics of the porous NiAl obtained at different heating rates (2, 10, 20 °C min −1 ) were compared. The result of the closed porosity calculation showed that a lower heating rate (2 °C min −1 ) promoted the Kirkendall reaction between Ni and Al, resulting in a high closed porosity (5.25%). However, at a higher heating rate (20 °C min −1 ), a homogeneous NiAl phase was observed using the threshold segmentation method, indicating uniform and complete TE reaction can be achieved at a high heating rate. The result of the 3D fluid simulation showed that the sample heated at 10 °C min −1 had the highest permeability (2434.6 md). In this study, we systematically investigated the relationship between the heating rates and properties of the porous NiAl intermetallic, including the phase composition, porosity, exothermic mechanism, oxidation resistance, and compression resistance. Our work provides constructive directions for designing and tailoring the performance of porous NiAl intermetallic compounds.
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Junwei Xu,Ya Chen,Lida Shen,Jiantao Zhao,Guibin Lou,Dazhi Huang,Youwen Yang
A method for fabricating superhydrophobic stainless-steel meshes based on magnetic field-assisted jet electrodeposition is proposed. Ferromagnetic nickel particles (Nip) were added to the electroplating solution to prepare Ni/Nip coatings with mountain-like rough structure on stainless-steel meshes, followed by application of a parallel magnetic field in the cathode region. Magnetic fields play an indispensable role in the preparation of coatings. Exposure to air for 6 days resulted in a spontaneous switch of the coating from superhydrophilicity to superhydrophobicity and exhibited superoleophilicity. X-ray photoelectron spectroscopy revealed that this transition in wettability was related to spontaneous adsorption of hydrocarbons in the air induced by the coating. Based on the superhydrophobicity and superoleophilicity of the as-prepared Ni/Nip-coated meshes, high-efficiency, high-throughput, and high-purity separation of oil-water mixtures was achieved with a 300-mesh mesh. Furthermore, the as-prepared meshes continue to exhibit a separation efficiency greater than 97.0% and stable reusability even after 50 repeated separations.
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 25
·9728-9734
·
IF 4.569
Dong Zhang,Shen-Jing Ji,Yu Cao,Nian-Tzu Suen
In this work, we have demonstrated that one can control the intrinsic activity of Ni metal toward the hydrogen evolution reaction (HER) by simply alloying Ni with different elements (i.e. Ti, Ge or Sn). The HER activities of Ni3M (M = Ti, Ge and Sn) series and Ni metal follow the order of Ni3Ti (η10 = 68 mV) > Ni3Sn (η10 = 122 mV) > Ni3Ge (η10 = 161 mV) > Ni (η10 = 273 mV). After normalizing their HER performances based on the roughness factor (RF), it was realized that Ni3Ti and Ni3Sn both exhibit higher intrinsic HER activities than that of Ni metal while Ni3Ge displays the worst HER performance. This trend was later rationalized by using density functional theory (DFT) calculation, which showed that blending Ni with Ti, Ge or Sn elements will alter the corresponding electronic structure and bonding scheme. Such a change in the bonding scheme (i.e. bonding state or antibonding state) will influence the adsorption energy of the H atom (ΔGHad) on an active site and is the main cause of the synergetic effect that results in the different HER efficiencies of Ni3M (M = Ti, Ge and Sn). Through the present case study, it was recognized that alloying is a simple yet effective strategy to promote the HER activity of an electrocatalyst. With a suitable combination between elements, it helps single metals (e.g. Co or Ni metal) exceed the limits on their intrinsic HER activities and has the potential to replace noble metals (e.g. Pt, Ir and Ru) in the future.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 26
·10061-10068
·
IF 4.569
Congli Wang,Hongfang Jiu,Lixin Zhang,Wei Song,Yufang Zhang,Hao Wei,Qianwen Xu,Yaqi Qin,Sicong Che,Zhixin Guo
It is of utmost importance to explore bifunctional electrocatalysts for water splitting. Herein, unique ZnCo2O4–CoOOH heterostructured ultrathin nanosheets on Ni foam are reported that combines a two-step hydrothermal method. This catalyst exhibits excellent catalytic performances to achieve a current density of 10 mA cm−2 with an ultralow overpotential of 115 mV for HER, attaining an overpotential of 238 mV at 20 mA cm−2 for OER. Remarkably, ZnCo2O4–CoOOH/Ni shows a voltage of 1.494 V to drive a current density of 10 mA cm−2. Such performances are due to the inter-penetrative pores present in the ultrathin nanosheets that provide large surface areas and expose massive active sites to enhance activities. In addition, the unique nanosheet structure and the 3D Ni foam substrate possess large specific surface areas, which can facilitate mass diffusion. This excellent performance is ascribed to the ZnCo2O4–CoOOH heterostructure that manipulates strong synergy to improve the electrochemical activity. This study offers new insight on an innovative approach for the exploitation of effective bifunctional electrocatalysts with a heterostructure.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE CHINESE CHEMICAL SOCIETY
·
2022
·Vol. 69
·期 11
·1886-1896
·
IF 1.753
Luqman Ahmed Pirzada,Abdul Qayoom Mugheri,Sahib Ghanghro,Ashaque Hussain Pirzada,Mazhar Hussain Ibupoto,Kashif Ahmed
To overcome the energy demand, environmental pollution, and global warming, replacing fossil fuels using clean and renewable hydrogen energy is a promising strategy. Water catalysis is the key step toward industrial hydrogen generation. Herein, we obtained remarkable performance of CuCo for hydrogen evolution reaction (HER) in sulfuric acid and potassium hydroxide. The CuCo nanocomposite functional material on nickel foam is rich in copper nanoparticles. The CoCu oxide on nickel foam showed catalytic performance superfast in the HER in a 1 M KOH environment at 1.62 V to carry a 10 mA/cm 2 current density and no decrease in current afterward a non-stop run for 25 hr. CoCu (S2) has a Tafel slope of (a) 69 mV/dec in a 0.5 M H 2 SO 4 and (b) 119 mV/dec in a 1 M KOH. It has been found to be cost-effective, highly active, and healthy for energy conversion by electrochemical. Moreover, the capabilities of charge storage were also inspected. It strongly provides a capacitance of 681 and 607 F/g at a 1 A/g admirable rate of capacitance retention. The attractive features of CoCu oxide are present in more abundance and superior for the HER kinetics activity. The electrocatalyst provides better stability and durability and provides long-term applications for the advance of a functional catalyst for charge storage, and water splitting applications is strongly demonstrated.
✓ 已验证
产品关联
DOI
高影响因子
AICHE JOURNAL
·
2022
·Vol. 69
·期 2
·e17877
·
IF 4.167
Tianjin Li,Bo Chen,Meifang Cao,Xinping Ouyang,Xueqing Qiu,Changzhi Li
The efficient utilization of lignin remains a great challenge due to its complex nonrepetitive structure and the lack of efficient catalyst. Herein, a single-atom catalyst Ni@N-C was designed via a facile chelation-anchored strategy. Ni atoms were immobilized on the N-doped carbon carrier by a two-stage pyrolysis of a mixture of d -glucosamine hydrochloride, nickel acetate, and melamine. d -glucosamine hydrochloride as a chelating agent prevented the aggregation of Ni 2+ , and melamine provided enough N to anchor Ni by forming Ni–N 4 structure. Ni@N-C gave a 31.2% yield of aromatic compounds from lignin hydrogenolysis, which was twice higher than that achieved by Ni cluster catalyst. Based on the experimental and density functional theory (DFT) calculation results, the higher activity of Ni@N-C was attributed to its lower H 2 dissociation energy and the reduced energy barriers of the transition states. The strategy described opens an efficient green avenue for preparing single-atom catalyst that possesses outstanding activity in lignin depolymerization.
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Si-Jia Guan,Peng Zhang,Shen-Jing Ji,Yu Cao,Nian-Tzu Suen
It is well known that the “iron” impurity will influence the oxygen evolution reaction (OER) in an alkaline electrolyte, especially for the Ni-based electrocatalyst. Many research studies have investigated the function of Fe in the OER active phase, such as M(OH)2/MOOH (M = Ni and/or Fe), while, surprisingly, very few studies have examined the function of Fe in the “precatalyst” system. Accordingly, in this work, the Ni3–xFexP (x = 0, 0.5, 1) series as an Ni-based precatalyst was employed to inspect the function of internal and external Fe in the Ni-based precatalyst system. It was realized that the sample with internal Fe (i.e., Ni2.5Fe0.5P and Ni2FeP) exhibits efficient OER activity compared to that of the Fe-free one (i.e., Ni3P) owing to the large amount of active M(OH)2/MOOH formed on the surface. This indicates that the internal Fe in the present system may have the ability to facilitate the phase transformation; it was later rationalized from electronic structural calculations that the d band center of the internal Fe (middle transition metal) and Ni (late transition metal) holds the key for this observation. Adding excessive ferrous chloride tetrahydrate (FeCl2·4H2O) as the external Fe in the electrolyte will greatly improve the OER performances for Ni3P; nevertheless, that the OER activity of Ni2FeP is still much superior than that of Ni3P corroborates the fact that the Fe impurity is not the only reason for the elevated OER activity of Ni2FeP and that internal Fe is also critical to the phase transformation as well as OER performance.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2022
·Vol. 10
·期 21
·8206-8217
·
IF 8.067
Huaping Wu,Hangcheng Qi,Xueer Wang,Ye Qiu,Kuanqiang Shi,Hengjie Zhang,Zheng Zhang,Wenan Zhang,Ye Tian
Stretchable and biocompatible hydrogel-based strain sensors have been considered as promising candidates for flexible wearable electronics in the light of their properties being similar to those of biological tissues. To date, excellent mechanical performances and high sensitivity are still challenging to satisfy the practical applications. In this work, a flexible strain senor is made of patterned liquid metal (LM) sandwiched by poly(acrylamide-co-acrylic acid)/Zr4+ (P(AAm-co-AAc)/Zr4+) hydrogel with a bilayer structure. The carboxyl–Zr4+ coordination bonds endow the prepared hydrogel substrate with moderate water content, as well as spectacular and adaptable mechanical properties. In addition, LM is doped with silicon oxide particles as a conductive layer to improve the sensitivity of the flexible sensor. The flexible sensor combines sensing performances of high sensitivity (maximum gauge factor = 7.16), an ultralow detection limit (0.1%), and a wide strain sensing range (up to 400%). LM-hydrogel strain sensors demonstrate reliable detection of repeated large strains and small vibrations of human movements. As a proof of concept, the sensor can be utilized to detect finger rehabilitation training in different periods owing to the controllable mechanical response. Furthermore, by introducing machine learning, the device with the sensor detects the writing words quickly and accurately, indicating that human activities have been recognized with proper training, which is an important premise for human–machine interaction.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Ruonan Zhang,Yanchao Xu,Liguo Shen,Renjie Li,Hongjun Lin
Efficient separation of oil-in-water emulsion remains a decisive step for success of oily wastewater treatment . To achieve this goal, a novel strategy regarding combining membrane separation with in situ electrocoagulation based on sacrificial anodes and cathodic hydrogen evolution via conductive metalized fabric membrane was proposed. As a key component of this novel coupling system, nickel functionalized fabric membrane with high hydrophilicity and electrical conductivity (electrical resistance of ∼2 Ω cm −1 ) was successfully prepared via a low-cost and facile route, including steps of PVA (polyvinyl alcohol)/Ni coating and autocatalytic electroless Ni plating. The optimized conductive membranes exhibited high permeate flux (19.3 × 10 5 L m −2 h −1 ·bar −1 ), separation efficiencies (99.5%), and separation stability to separate oil/water mixtures during the gravity-driven filtration process. To achieve the ideal performance to separate oil-in-water emulsion, a coupled electrocoagulation-membrane separation system was constructed with Ni@PVA membrane and Al mesh as the cathode and anode, respectively. It was shown that the coupled electrocoagulation-membrane separation system could achieve 99.4% rejection with high flux of 12.0 × 10 3 L m −2 h −1 ·bar −1 for oil/water emulsion separation, under the current density of 8 mA cm −2 and 20 min electrolysis time. This study revealed that the proposed electrocoagulation-membrane separation system based on Ni@PVA membrane is a promising technique in oil/water separation.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）