APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Ya-yun Li,Qiuming Zou,Zhangjian Li,Dong Xie,Yuan Niu,Jizhao Zou,Xierong Zeng,Junfeng Huang
Bimetallic electrocatalysers have attracted dramatic attentions in recent years owing to their unique electronic configuration, charge transfer efficiency and synergistic effect. Ni-Fe based alloys are considerable as one of the most promising materials with superior electrocatalytic performance since the outstanding oxygen reaction activity of iron and the strong capability of nickel. Herein, Ni-Fe MOF derived Ni-Fe alloys embedded graphitic carbon electrocatalyst is synthesized as bifunctional oxygen electrocatalyst with hierarchical porous structure and superior oxygen reaction electrocatalytic performance. The onset potential and the half-wave potential of Ni 0.6 Fe 0.4 CM in oxygen reaction are 0.88 V and 0.75 V, respectively, which are superior than those of commercial Pt/C. Furthermore, a low overpotential of 320 mV at 10 mA/ cm 2 is obtained in oxygen evolution reaction, which is well consistent with that of commercial RuO 2 . In the meantime, excellent long-term stability and anti-methanol ability endow Ni 0.6 Fe 0.4 CM exhibiting brilliant electrocatalytic performance as commercial Pt/C and RuO 2 . The assembled Zn-air battery exhibits smaller voltage gap (0.76 V) than that for commercial Pt/C and RuO 2 , and it has remarkable stability around 170 cycles in the discharge–charge test. These results summarize the merits of bimetallic electrocatalysers for bifunction electrochemical performance and promote the development of electrocatalytic applications.
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高影响因子
CARBON
·
2021
·
IF 9.594
Zhen Xiang,Xiang Zhang,Yuyang Shi,Lei Cai,Jie Cheng,Haojie Jiang,Xiaojie Zhu,Yanyan Dong,Wei Lu
Developing high-efficiency electromagnetic wave absorption materials with versatility has been a hotspot and it remains a huge challenge. Here, we reported versatile laminated Ni nanoparticles @ porous carbon (Ni@C) nanocomposites synthesized by a facile carbonization of Ni-based metal-organic frameworks (MOFs) precursor. It was found that the phase components (Ni and C phases) and nano/microstructure (laminated and porous characterizations) were well-modified by controlling the calcination temperature, which led to the variation of the degree of graphitization , magnetic properties , and electromagnetic performances. It showed that the laminated porous Ni@C nanocomposites achieved enhanced microwave absorption performances with a thin thickness of 1.5 mm, a strong reflection loss of −59.8 dB and an effective absorption bandwidth of 4.5 GHz. The underlying microwave absorption mechanism was owing to the improved synergistic effects of polarization relaxation, electron transport , ferromagnetic resonance, as well as multiple reflections and scattering in the laminated porous Ni@C nanocomposites. Furthermore, the multicomponent and laminated porous architecture endowed nanocomposites with favorable waterproof, heat isolation and infrared shielding versatility. Therefore, this work demonstrated a facile approach to develop MOFs-derived versatile laminated porous nanocomposites with efficient microwave absorbing performances.
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高影响因子
ACS Applied Nano Materials
·
2021
·
IF 5.097
Chao Gai,Xia Wang,Jinghai Liu,Zhengang Liu,Yong Sik Ok,Wen Liu,Alex C. K. Yip
Aqueous-phase reforming of organic molecules to hydrogen is a promising strategy to address the production and storage of sustainable hydrogen with lower costs; however, the synthesis of inexpensive transition metal (TM) catalysts with desirable activity and stability for the reaction is still challenging. In this work, a green and efficient approach for modulating the geometric/electronic structure of metal/hydrochar nanocomposites from sustainable biomass was proposed for enhancing H2 production via aqueous-phase reforming of methanol (APRM). A Ni/HC nanocomposite with a special thistle (a perennial species of flowering plant)-like three-dimensional (3D) architecture was first constructed as a model catalyst to expatiate the critical role of modulating an ordered mesoporous structure and interface electron transfer for enhancing APRM. Deliberately balancing heteroatom doping and soft templates contribute to the successful fabrication of the thistle-like superstructure, and such hierarchically porous architectures demonstrated efficient catalysis for APRM, owing to their unique properties, including a highly uniform morphology, narrow particle size distribution, and mesoporous texture with excellent accessibility. In addition, the experimental investigation and density functional theory calculations both substantiated that the combination of heteroatom doping and soft templates was beneficial for the strong electronic metal–support interaction (EMSI) of the metal/hydrochar nanocomposite, which leads to enhanced methanol adsorption, activation, and subsequently improved APRM performance. The electronic structure of the metal/hydrochar nanocomposite played a more significant effect on the intrinsic APRM activity than the geometric structure like the formation of the thistle-like superstructure. Benefiting from the tailored electronic and geometric structure, the resulting Ni0.1/HC-N1.5-S1 catalyst exhibited an unprecedented average turnover frequency (TOF) of 89.5 molH2/molNi/min, higher than any other known platinum group metal-free catalysts, approaching the reactivity of the state-of-the-art noble metal-based APRM catalysts, while showing excellent stability over 10 consecutive reaction cycles.
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高影响因子
Journal of Environmental Chemical Engineering
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2021
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IF 5.909
Zhiyan Hou,He Meng,Xueqing Shao,Xianglong Wang,M. Usman Tahir,Shakiaz Ahmad,Chao Yang,Xintai Su,Lijuan Zhang
The complex composition and recycling process of electroplating sludge are the two major obstacles restricting the recycling of metal resources. In this work, Ni(HCO 3 ) 2 hollow spheres with unique amorphous structure were prepared via a simple and controllable hydrothermal method using nickel-containing electroplating sludge as raw material and ascorbic acid (AA) as complexing agent . The introduction of AA not only changed the morphology of the sample, but also formed pure phase Ni(HCO 3 ) 2 . The controllable amorphous structure is beneficial to the diffusion of OH - in the electrolyte. More importantly, its disordered atomic arrangement and metastable structure provide a large number of active sites and ion transmission channels, which improve the specific capacity. Consequently, amorphous Ni(HCO 3 ) 2 delivers a large capacitance of 599.8 C g −1 at 1 A g −1 , besides large capacitance, it also exhibits large rate capability (61.02% at a current density of 10 A g −1 ) and cycle performance (capacitance retention 52.09% after 1000 cycles). Importantly, the recoveries of nickel, iron and aluminum are 95.57%, 99.92% and 92.30%, respectively, indicating that electroplating sludge has a good application prospect as electrode materials for supercapacitors .
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高影响因子
ENERGY CONVERSION AND MANAGEMENT
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2021
·
IF 9.709
Shengnan Yan,Zhenggui Li,Xiaobing Liu,Fang Chen,Wangxu Li,Jie Cheng
Magnetically driven photothermal conversion and energy storage techniques can enhance the energy storage performance of phase change materials (PCMs) and thus have immense potential in energy applications. Paraffin is a common PCM that melts slowly and has poor rate of heat storage capacity. In this study, the effect of a controllable magnetic field on the photothermal and heat storage properties of paraffin was investigated. First, a reduced-graphene-oxide/nickel foam (rGO@Ni foam) composite film with good photothermal ability, corrosion resistance, and oxidation resistance was prepared, and photothermal conversion and energy storage processes under different magnetic fields were experimentally studied. The movement of the composite film could be adjusted by the action of magnetic force, especially to enhance the phase interface movement, accelerate paraffin melting, and improve the photothermal capacity and heat storage characteristics of the material. The composite film and phase interface could be dynamically tuned by regulating the magnetic field, thus enhancing the photothermal conversion effect. In particular, with increasing magnetic field strength, the thermal energy storage efficiency and speed of phase interface movement increased by 29% and 50%, respectively. The proposed magnetic force-driven method will enhance solar energy conversion and promote direct solar energy applications.
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高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Min Wen,Na Yang,Jiahong Wang,Danni Liu,Wenchao Zhang,Shi Bian,Hao Huang,Xingchen He,Xin Wang,Seeram Ramakrishna,Paul K. Chu,Shihe Yang,Xue-Feng Yu
Two-dimensional (2D) semiconductors are promising photocatalysts; in order to overcome the relatively low efficiency of single-component 2D photocatalysts, heterostructures are fabricated for effective charge separation. Herein, a 2D heterostructure is synthesized by anchoring nickel nanoparticle-decorated black phosphorus (BP) nanosheets to graphitic carbon nitride (CN) nanosheets (CN/BP@Ni). The CN/BP@Ni heterostructure exhibits an enhanced charge separation due to the tight interfacial interaction and the cascaded electron-transfer channel from CN to BP and then to Ni nanoparticles. Possessing abundant active sites of Ni and P–N coordinate bonds, CN/BP@Ni shows a high visible-light-driven H2 evolution rate of 8.59 mmol·h–1·g–1 with the sacrificial agent EtOH, about 10-fold to that of CN/BP. When applying benzyl alcohol to consume photogenerated holes, CN/BP@Ni enables the selective production of benzaldehyde; therefore, two value-added products are obtained in a single closed redox cycle. This work provides new insights into the development of photocatalysts without non-noble metals.
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PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2021
·
IF 5.816
Dongting Wu,Aiqun Kong,Wei Li,Yan Fu,Jinli Zhang
Bimetallic Ni–Fe phosphide electrocatalysts were in-situ synthesized through direct phosphorization of metal salts on carbon cloth (CC). The Fe dopant remarkably enhances the OER performance of Ni 2 P in alkaline medium through the electronic structure modulation of Ni. The (Fe 0.5 Ni 0.5 ) 2 P/CC electrode, composed of uniform films coated on carbon fibers, delivers a low overpotential of 260 mV with a small Tafel slope of 45 mV·dec −1 at the current density of 100 mA cm −2 , outperforming most reported non-noble electrocatalysts and commercial RuO 2 electrocatalyst. The (Fe 0.5 Ni 0.5 ) 2 P/CC also displays superior electrochemical stability at high current density . An appropriate Fe dopant level facilitates the in-situ transformation of Ni–Fe phosphides into active NiFeOOH during alkaline OER. This work simplifies the synthesis procedure of metal phosphides.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
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IF 8.128
Weiji Dai,Yin'an Zhu,Yike Ye,Ye Pan,Tao Lu,Saifang Huang
Surface reconstruction of non-oxide oxygen evolution reaction (OER) electrocatalysts has been intensively studied to improve their catalytic performances. However, further modification of the reconstructed active surfaces for better catalytic performances has not been reported. In this work, NiSe nanorods are prepared on nickel foam (NiSe@NF) as the pre-catalyst for electrochemical OER. It is revealed that non-stoichiometric NiO nanosheets with abundant Ni vacancies (Ni x O) are formed on the surfaces of NiSe nanorods (Ni x O/NiSe@NF) via in-situ electrochemical oxidation. Furthermore, the OER performances are obviously improved after heteroatom Fe is incorporated electrochemically into Ni x O nanosheets ((FeNi)O/NiSe@NF). For OER to have a current density of 20 mA cm −2 in 1 M KOH solution, the as-prepared (FeNi)O/NiSe@NF electrode only needs an overpotential of 268 mV. Density functional theory (DFT) calculations reveal that the formation of Ni vacancy can increase the free energy of *OH. More importantly, the incorporation of heteroatom Fe into Ni vacancy can significantly decrease the free energy of *O, which enables Fe-NiO to have the lowest theoretical overpotential for OER in this work. The present work provides a facile and universal strategy to modify the reconstructed active oxides’ surfaces for higher electrocatalytic performances.
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PubMed
高影响因子
ENERGY CONVERSION AND MANAGEMENT
·
2021
·
IF 9.709
Wen Tang,Jing-Pei Cao,Zhi-Hao Wang,Zi-Meng He,Tian-Long Liu,Ze-Ying Wang,Fei-Long Yang,Jie Ren,Xiao-Yan Zhao,Xiao-Bo Feng,Hong-Cun Bai
The development of cheap and highly dispersed nano-catalyst is one of the key technologies for low temperature steam reforming (SR) of biomass tar. This work used acid-washed and oxidized Shengli lignite char (OXAWSL) as carbon precursor to load Co (Co/OXAWSL) and Ni (Ni/OXAWSL) via ion exchange method to SR of toluene and biomass tar. The Co/OXAWSL was more active and stable than Ni/OXAWSL during the 30 h test with a final toluene conversion of 85% at a relatively low temperature of 450 °C and steam to carbon ratio (S/C) of 3.4, which resulted from its small particle size (5.6 nm) and high dispersion (12.3%) of Co. The relatively high H 2 production (42.59 mmol/g-biomass) over Co 0.1 /OXAWSL (450 °C, S/C = 3.4) in SR of tar was also obtained. A low E a (22.0 kJ/mol) value of Co/OXAWSL and good affinity to oxygen for Co explained its excellent performance. The low-temperature tar cracking process can provide theoretical and technical support for the large-scale industrial utilization of biomass pyrolysis and gasification.
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高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2021
·Vol. 25
·期 5
·1503-1512
·
IF 2.647
Zhang Aiqin,Xiao Yuanhua,Cao Yang,Fang Hua,Zhang Yong,Das Paramita,Zhang Huan
Transition metal–based catalysts are considered to be promising materials to replace noble metal catalysts for electrocatalytic water splitting. Herein, a flexible electrode composed of Co-Ni-P ternary catalysts and carbon fiber paper substrate (Co-Ni-P/CFP) was successfully fabricated and applied in water electrolysis. The Co-Ni-P coatings were deposited on CFP by a one-step cyclic voltammetric electrodeposition method and the surface of the composite material exhibits nano-reticular structure. The formation mechanism was also discussed according to the results of material characterization. Notably, the Co-Ni-P/CFP flexible electrode exhibited superior catalytic performance for both hydrogen and oxygen evolution reactions in alkaline media, which could achieve 10 mA/cm 2 current density with overpotential of 89 mV for HER and 320 mV for OER. Moreover, the Co-Ni-P/CFP electrode could also be used as both anode and cathode electrode to drive overall water splitting and required only 1.64 V to achieve a current density of 10 mA/cm 2 , which was very close to that of the commercial combination of Pt/C and IrO 2 . This affordable and easily obtained electrode offers a new avenue to develop earth-abundant resource catalysts for water electrolysis system.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Fenyang Tian,Shuo Geng,Lin He,Yarong Huang,Akhmat Fauzi,Weiwei Yang,Yequn Liu,Yongsheng Yu
Transition metal phosphides have shown Pt-like hydrogen evolution reaction (HER) activity in acid and alkaline solution, while their HER performance in neutral-pH is really poor owing to the high resistance and inefficient mass transfer in neutral-pH electrolyte. In this work, the well-arranged core/shell PSS-PPy/Ni-Co-P growing on Cu foil, in which Ni-Co-P is the core and the mixed polymer of pyrrole and sodium polystyrene sulfonate is the shell, has been demonstrated to be a highly efficient electrocatalyst for HER in neutral-pH electrolyte. The PSS-PPy/Ni-Co-P/CF self-supporting electrode was easily synthesized by electrodeposition and chemical deposition at room temperature. According to the experiment and DFT calculation results, PSS-PPy not only improves the conductivity and hydrophilicity of Ni-Co-P, but also optimizes the electronic structure of Ni-Co-P. Thus, the PSS-PPy/Ni-Co-P shows remarkable HER activity with only overpotential of 106 and 67 mV at the current density of 10 mA cm −2 in neutral-pH and alkaline electrolytes, respectively. Furthermore, PSS-PPy/Ni-Co-P has excellent stability in neutral-pH, alkaline electrolytes and even seawater. The current surface modification method directs us to design more low-cost, high-efficiency and stable electrocatalysts for HER in neutral-pH electrolyte.
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高影响因子
DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 28
·9746-9753
·
IF 4.39
Yan He,Tao Yu,Hui Wen,Rui Guo
For the electrocatalytic oxygen evolution reaction (OER) in alkaline media, there is an urgent need to optimize the adsorption strength of OH*. Here, a flower-like hybrid of Cr-doped FeOOH/Ni(OH)2 was used as an OER catalyst with a low overpotential of 291 mV at 50 mA cm−2. The results showed that faster charge transfer was achieved at the electrode/solution interface during the OER process after the FeOOH/Ni(OH)2 was modified by Cr, which facilitates the rate-determining step of the Volmer reaction. Furthermore, the results of faradaic efficiency and X-ray photoelectron spectroscopy (XPS) measurements confirmed that the synergistic effect between the ternary metal and oxygen vacancies led to excellent OER performance. This work provides a new strategy for the preparation of high-efficiency and low-cost oxygen evolution electrocatalysts.
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高影响因子
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