JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
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IF 9.965
Linwei Jiang,Yichen Pan,Jiancheng Zhang,Xin Chen,Xinwen Ye,Zhendong Li,Caicai Li,Qingfeng Sun
Replacing the sluggish oxygen evolution reaction (OER) with thermodynamically favorable urea oxidation reaction (UOR) is an appealing tactic in the energy-saving water splitting system. Herein, by a facile composite electrodeposition method, an electrocatalyst with Mo particles anchored on the Ni-P matrix (Mo/Ni-P) was fabricated and utilized for urea-assisted water electrolysis of hydrogen production. As expected, the urea-involved electrolytic cell with the as-obtained Mo/Ni-P served as both the anode and cathode merely needs a voltage of 1.55 V to sustain a current density of 50 mA cm −2 (0.16 V less than that of the conventional water splitting at 50 mA cm −2 ) and can maintain the stability for 12 h. Additionally, the solar-driven urea-assisted water electrolysis system was constructed under lab conditions and solar-hydrogen-electricity energy conversion processes were also simulated. Moreover, it was demonstrated that tungsten (W) particles can also serve as an accelerant for promotion both the hydrogen evolution reaction (HER) and UOR activity of pristine Ni-P. This work will present a facile method for rational integration of metal particles with Ni-P layer for highly efficient electrocatalysts applied in economic production of H 2 .
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
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IF 7.139
Kun Qian,Fang Fang,Yifeng E,Yao Xu,Xiyuan Tong,Peng Chen,Lu Han,Zhuozhe Li
One of the important factors determining the expansion of the application domain of direct methanol fuel cell (DMFC) is its energy density . The bismuth-nickel doped LTA zeolite was as-synthesized in hydrothermal condition and applied into the electrochemistry catalysis of methanol oxidation reaction (MOR) with high performance in the methanol concentration ranging from 0.5 M to 35 M without observed catalyst poisoning . A trace amount of Bi and Ni atoms are highly dispersed on the opening window of the zeolitic surface by the electrochemical rearrangement process. The surface of the LTA structure zeolite is a good carrier for the metal cations with Na cations which could be replaced in hydrothermal crystalline process while the inner direct pores provide a channel for CO gas to escape and prevent catalyst poisoning in electrochemistry progress. Through the comparative study with the Bi doped LTA, Ni doped LTA and the commercial Pt/C catalyst, the Bi and Ni doped LTA reveals higher performance in monatomic catalytic efficiency and electrochemical stability. And through the mutual interaction of diatomic, the doped zeolite material highly improves the energy density of methanol fuel cells and reduces the cost of the cells concerning the absence of noble metals.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2022
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IF 10.753
Xiao-Qiu Lin,Jia-Mei You,Ling-Yu Meng,Naoko Yoshida,Jing-Long Han,Cong-Ju Li,Ai-Jie Wang,Zhi-Ling Li
Tetrabromobisphenol A (TBBPA), a hazardous and persistent flame retardant , has been widely detected in the natural aquatic system. The acceleration of reductive debromination (rate-limiting process) is vital during the decomposition and detoxification of TBBPA. This study achieved superior TBBPA electrochemical reductive debromination performance by nano Pd doped Ni foam electrode (4.8 times higher than Ni foam electrode). The optimal TBBPA reductive debromination performance was obtained under −1.2 V of cathode potential, 1.2 wt% of Pd loading, 10 mg L −1 of TBBPA and 100 mM of Na 2 SO 4 as the electrolyte solution. UPLC-QTOF-MS verified that Br atoms in TBBPA were removed sequentially to form bisphenol A as the major product. Most TBBPA was reductively debrominated by atomic H* through indirect hydrodebromination, evidenced by the atomic H* quenching test. The higher solution conductivity and appropriate TBBPA concentration would contribute to the debromination efficiency. Excessive H 2 generation whether by over negative potential or H atom richness electrolyte largely disturbed the reaction process and restricted the debromination. The improved generation of reductant (H*) ads Pd was the most significant, while excessive Pd loading would make aggregation and limit the debromination efficiency. The study confirmed the optimization strategies of conditions for Pd/Ni foam electrode and revealed the related function mechanism for stimulating TBBPA electrochemical reduction, giving suggestions for the efficient removal of TBBPA in the aquatic environment.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2022
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IF 6.371
Yang Yu,Xiaoping Cai,Xinyang Jiao,Chengyi Xu,Jinan Niu,Peizhong Feng
Ni-Al-Cr intermetallic compounds are candidate at extreme environment due to their excellent oxidation resistance at high temperature, and the oxidation resistance of Ni-Al-Cr alloy system has been studied extensively. However, the research on oxidation resistance mechanism of porous Ni-Al-Cr intermetallic compounds is still not deep. In our work, porous Ni-Al-Cr intermetallic compounds were synthesized by thermal explosion, and the oxidation resistance of porous Ni-Al-Cr system was mainly investigated. The results indicate that Cr promotes the formation of highly protective continuous Al 2 O 3 layer, increasing the oxidation resistance at 900 °C of porous Ni-Al-Cr. After oxidation at 900 °C for 120 h, the minimum mass gain of Ni-Al-Cr products is only 6.96%.
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CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Fei Wu,Mengyun Ling,Lingyun Wan,Pei Liu,Yabin Wang,Qiuyu Zhang,Baoliang Zhang
Herein, we construct two metal–organic frameworks (MOFs) composite nanoflowers (NFs) with anisotropic binary assembled structures by a facile one-pot method. Different from the two-step epitaxial growth method, the anisotropic assembly of the binary MOFs (MOF-5 and MIL-88B) in the mixed system can be realized without preparing the template MOFs. The ions coordinated self-assembling behaviors during the formation of the three-dimensional (3D) structure are clarified. The absorbing mechanisms of the derivative absorber are elucidated. The results indicate that the special hierarchical assembled structure endows absorbers with rich heterogeneous interfaces, porous structure, suitable impedance matching and complementary loss mechanisms. The optimized absorbers FeCoZn@C NFs and FeNiZn@C NFs exhibit outstanding microwave absorption performance. Only with a matching thickness of 1.9 mm, the effective absorbing bandwidth (EAB, reflection loss (RL) < −10 dB) of the absorber covers 6.0 GHz (12–18 GHz, the entire Ku band). The minimum reflection loss (RL min ) reaches −53.1 dB (loss of electromagnetic waves above 99.999%). This study might shed light on the preparation of high-performance microwave absorbers with sophisticated structures.
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ChemElectroChem
·
2022
·Vol. 9
·期 2
·e202101523
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IF 4.782
Junye Zhang,Hao Guo,Fan Yang,Mingyue Wang,Tingting Zhang,Hao Zhang,Wu Yang
Graphical Ni-MOF derived CMs@Ni(OH) 2 /NiSe with a core-shell structure was designed. The obtained core-shell nanostructure material possesses a high contact area, excellent synergistic effect and can provide more reactive active sites. The application of Ni-MOF in supercapacitors has received widespread attention, but its poor conductivity and bad stability hinder its application. Therefore, Ni-MOF derived CMs@Ni(OH) 2 /NiSe with a core-shell structure was designed. Here, carbon microspheres (CMs) were explored as the conductive substrate to enhance the stability and in situ prepared Ni-MOF was anchored on the surface of CMs. Then, alkali-treatment and selenylation were carried out on CMs@Ni−MOF to improve stability and conductivity. The obtained core-shell nanostructure material possesses a high contact area, excellent synergistic effect and can provide more reactive active sites. The prepared CMs@Ni(OH) 2 /NiSe shows a higher specific capacitance (2106 F g −1 ) and excellent cycling performance with a capacitance retention of 95 % after 30000 cycles. Furthermore, the assembled CMs@Ni(OH) 2 /NiSe//AC device delivers a high energy density of 70.84 Wh kg −1 at the power density of 756.8 W kg −1 and maintains 100 % of the initial capacitance after 40000 cycles.
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Journal of Inorganic and Organometallic Polymers and Materials
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2023
·Vol. 33
·期 9
·2721-2731
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IF 4
Asif Sana Ullah,Ghori Ubaid-ur-Rehman,Ranjha Qasim Ali,Ahmed Fahim,Solre Gideon F. B.,Ahmad Ishfaq,Ibrahim Fatma A.,Hamdy Mohamed S.,Saleh Ebraheem Abdu Musad,Eldin Sayed M.
In this work, Ba 0.8 In 0.2 Fe 12−x Ni x O 19 (x = 0.00–2.00) hexaferrites were prepared by the ceramic route, and the effect of ferromagnetic dopant Ni was retrieved on the structure and magnetic properties. Microstructural properties were explored using XRD and SEM. The range of the grain size was between 500 to 2000 nm. In addition to these, micro strain, dislocation density, and porosity were determined. According to the VSM findings, ferromagnetic nickel doping increased the magnetic saturation up to 58.36 emu/g. The coercivity values were observed within a defined range from 5.129 kOe to 5.512 kOe, showing only a slight change. Moreover, the magnetocrystalline anisotropy constant, anisotropy field, and anisotropy parameter were calculated. The results showed that the magnetocrystalline anisotropy constant and anisotropy field both increased up to 0.06308 emu/g.kOe and 1.722 kOe for an increase in doping concentrations and then dropped for x = 2.0. The magnetic moment per formula unit in terms of Bohr magneton was also computed and has an upper limit of 11.603. These results suggest that the synthesized material is a good contender for magnetic applications.
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ChemSusChem
·
2023
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IF 8.4
Xiuhong Li,Xun He,Jie Yao,Kai Dong,Long Hu,Jie Chen,Longcheng Zhang,Xiaoya Fan,Zhengwei Cai,Shengjun Sun,Dongdong Zheng,Mohamed S. Hamdy,Qian Liu,Yonglan Luo,Yunwen Liao,Xuping Sun
Graphical Electrochemical nitrite reduction to ammonia : Ni nanoparticles strutted 3D honeycomb-like porous carbon framework acts as a highly efficient catalyst for ammonia synthesis via electrochemical NO 2 − reduction, delivering a large NH 3 yield of 12.04 mg h −1 mg cat. −1 and a high Faradaic efficiency of 95.1 %. Electroreduction of nitrite (NO 2 − ) to ammonia (NH 3 ) provides a sustainable approach to yield NH 3 , whilst eliminating NO 2 − contaminants. In this study, Ni nanoparticles strutted 3D honeycomb-like porous carbon framework (Ni@HPCF) is fabricated as a high-efficiency electrocatalyst for selective reduction of NO 2 − to NH 3 . In 0.1 M NaOH with NO 2 − , such Ni@HPCF electrode obtains a significant NH 3 yield of 12.04 mg h −1 mg cat. −1 and a Faradaic efficiency of 95.1 %. Furthermore, it exhibits good long-term electrolysis stability.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
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IF 7.2
Zhi Wang,Zhaokun Wang,Jiashuai Wang,Haofeng Shi,Chengdeng Wang,Yila Fan,Zhiming Bai,Chuang Zhu,Xiaoqin Yan
Water electrolysis has been acknowledged as a renewable, scalable, and effective way of producing hydrogen . However, for water splitting, efficient and noble metal-free electrocatalysts were lacking. Here, a Co–Ni–Zn porous three-dimension N-doped carbonization structure on the carbon nanotube film (CNTF) was synthesized through a metal organic frameworks (MOFs) annealing procedure. The porous morphology, caused by the evaporation of zinc at high temperatures, enhances the interaction between the catalysts and electrolyte, and the self-supporting structure minimizes the contact resistance between the catalysts and the substrate, which reduces obstructions during current flow. More active sites, multiple mesopores, and high conductivity are all features of this composite structure. It can achieve a small overpotential of 112 mV and 270 mV at a current density of 10 mA cm −2 , respectively, for hydrogen and oxygen evolution reactions (HER and OER). At a current density of 10 mA cm −2 , the Co–Ni–Zn/NCNTF has an external voltage of 1.58 V and is very durable for overall water splitting.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2023
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IF 10.9
Samuel Guemou,Liuting Zhang,Shuai Li,Yiqun Jiang,Tao Zhong,Zichuan Lu,Ren Zhou,Fuying Wu,Qian Li
The design of an excellent active catalyst to improve the sluggish kinetic and thermodynamic properties of magnesium hydride (MgH 2 ) remains a great challenge to achieve its practical application. In this study, a novel Ni-Nb/rGO nanocomposite catalyst was successfully prepared by one-spot hydrothermal and subsequent calcination methods. The novel Ni-Nb/rGO nanocomposite exhibits an exceptional catalytic effect on improving MgH 2 sorption properties. Specifically, the onset desorption temperature of MgH 2 + 10 wt% Ni-Nb/rGO composite is reduced to 198 °C, much lower than that of undoped MgH 2 (330 °C). Interestingly, the composite can release 5.0, 5.9, and 6.0 wt% H 2 within 10 min at 245, 260, and 275 °C, respectively. Furthermore, the dehydrogenated MgH 2 + 10 wt% Ni-Nb/rGO composite starts to absorb hydrogen even at room temperature with approximate 2.75 wt% H 2 uptake at 75 °C under 3 MPa H 2 pressure within 30 min and exhibits excellent stability by maintaining 6.0 wt% hydrogen content after 20 cycles at 300 °C. Chou's model suggests that the de/hydrogenation kinetics of Ni-Nb/rGO-modified MgH 2 switches from surface penetration model to diffusion model at lower temperatures. Additionally, the activation energies ( E a ) for the de/hydrogenation of MgH 2 + 10 wt% Ni-Nb/rGO are reduced to 57.8 kJ/mol and 33.9 kJ/mol, which are significantly lower than those of undoped MgH 2 . The work demonstrates that the addition of a novel ternary Ni-Nb/rGO catalyst is an effective strategy to not only boost the sorption kinetics of MgH 2 but also maintain its cycling property.
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Nanoscale
·
2023
·Vol. 15
·期 37
·15238-15248
·
IF 6.7
Nan Zhang,Gang Li,Zhichao Yu,Zhenguo Tang,Xiaoyan Liu,Congwei Wang,Kaiying Wang
Heterostructure interfacial engineering between photocatalyst and co-catalyst to obtain an optimized electronic structure is a promising approach to improving their performance in the photocatalytic hydrogen evolution reaction (HER). In this work, two-dimensional nanopetal-like ZnIn2S4 (ZIS) with an adequately exposed active (110) edge facet-decorated Ni cluster heterostructure was prepared via chemical bath deposition, followed by photodeposition. In the catalyst preparation, the ZIS microstructure was modulated to sufficiently expose the active sites of the (110) edge for the HER, on which spontaneous interfacial engineering with an additional Ni cluster co-catalyst would be triggered via photodeposition in situ. The hydrogen production rate of the composite photocatalyst was excellent, at up to 26.80 mmol g−1 h−1 under simulated sunlight, which was 15.4 times greater than that of pristine ZIS. The optimized photocatalyst achieved a state-of-the-art apparent quantum yield of 61.68% at a single wavelength of 420 nm. Combined with systematic experimental characterization and density functional theory calculation, it was demonstrated that the separation and migration of charge carriers were significantly enhanced via the Ni cluster-induced interfacial electron redistribution, which contributed to the near-zero Gibbs free energy barrier and favored intermediate (*H) adsorption and desorption behavior, resulting in the superior photocatalytic performance. In summary, this work enables tuning of the interfacial electronic properties via spontaneous photodeposition of metallic cluster co-catalyst on the edge active sites, through which the separation of photogenerated charge carriers and surface redox reactions can be synergistically facilitated.
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Journal of Water Process Engineering
·
2023
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IF 7
Xinrui Liu,Rui Guo,Xia Qin,Cuicui Xu
In this work, a Ni foam/CNTs/Cu composite electrode was prepared via the impregnation and electrodeposition methods. The electrode enhanced the total nitrogen removal and N 2 selectivity , when served as a cathode for NO 3 − -N reduction. SEM, EDS, XRD, and XPS characterization revealed that both CNTs and metallic copper were introduced onto the surface of the Ni foam substrate successfully. Besides, the LSV, CV, EIS and C dl results indicated more electrochemical active sites were in the Ni foam/CNTs/Cu electrodes than in Ni foam/Cu electrodes. Under optimal preparation conditions, the Ni foam/CNTs/Cu electrode showed N 2 selectivity of 68.89 % and nitrate removal rate of 96.75 % in 100 mg/L nitrate solution with Na 2 SO 4 as electrolyte. The selectivity of N 2 could be significantly enhanced by adding Cl − as electrolyte, and the nitrogen selectivity increased with the increase of Cl − concentration. At 1.25 g/L NaCl, the Ni foam/CNTs/Cu electrode could achieve >95 % nitrate and total nitrogen removal and close to 100 % N 2 selectivity. The N 2 selectivity of the Ni foam/CNTs/Cu electrode was 2.534 and 1.8 times of the Ni foam/Cu electrode when 0.5 g/L Na 2 SO 4 and 0.5 g/L NaCl were used as electrolytes, respectively. Consequently, to achieve the same nitrate reduction effect, the Ni foam/CNTs/Cu electrode could reduce the amount of NaCl compared with Ni foam/Cu electrode. The electrodes were tested in 6 cycles and proved to be stable. At last, a potential mechanism of nitrate‑nitrogen removal by the electrocatalytic process was suggested.
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