INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2021
·Vol. 45
·期 9
·13668-13680
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IF 5.164
Kai Yang,Hongzhe Ni,Xinming Du,Tianen Shui,Hongcheng Shen,Jingmei Xu,Yao Liu,Chenyang Li,Yepeng Gao,Zhe Wang
Summary A series of cross-linked anion exchange membranes (AEMs) base on poly (aryl ether ketone)s (PAEKS) with different contents of trimethylamine and 1-vinylimidazole by brominating and grafting was prepared. The designed structures of PAEKS and AEMs were demonstrated by the 1 H-NMR and FT-IR spectrum, respectively. TEM pictures confirmed that there are obvious microphase-separated morphologies in CImTPAEKS membranes, which provided a mass of efficient ionic transport channels. The OH − conductivity of the CImTPAEKS membranes had 0.070 to 0.083 S/cm at 80°C. The 1-vinylimidazole played a cross-linked role in AEMs, improving the dimensional stability and alkaline stability of AEMs. The OH − conductivity of the CImTPAEKS membranes still had 0.051 to 0.058 S/cm after the alkaline test (2 M NaOH at 80°C for 15 days). Moreover, the cross-linked membrane had prominent thermal stability. Based on these results, we are reasonable to believe that ClmTPAEKS membranes with excellent hydroxide conductivity and alkaline stability will be of great significance for the development of alkaline fuel cells.
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高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2021
·Vol. 45
·期 10
·15544-15556
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IF 5.164
Xuerui Yi,Fengxiang Yin,Xiaobo He,Guoru Li
Summary Water splitting driven by renewable energy represents a sustainable way to store clean energy. However, its efficiency is limited by the kinetically sluggish oxygen evolution reaction (OER), calling for highly active catalysts to accelerate the reaction rate. Herein, NiO is reduced by cellulose through a hydrothermal method to obtain the highly active OER catalysts. The obtained cellulose-partially-reduced-NiO (CL-prNiO) shows a hybrid structure, composed of 3.6 wt.% face-centered cubic (fcc) Ni and 96.4 wt.% rock salt structured NiO with highly disordered interface. The CL-prNiO delivers a current density of 10 mA cm −2 with an overpotential of 288 mV, which is comparable to the commercial RuO 2 and outperforms many of the recently reported Ni-NiO based OER catalysts. As benefited from the hybrid and disordered structure, CL-prNiO shows great ability of converting Ni 2+ to Ni 3+ at a potential prior to the OER onset. The in situ generated Ni 3+ species can activate the lattice oxygen in the unreduced NiO of CL-prNiO, significantly boosting the OER activity.
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高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2021
·Vol. 45
·期 9
·13040-13054
·
IF 5.164
Peng Su,Hai Liu,Qingxiang Ma,Zhiliang Jin
Summary The photocatalytic hydrogen evolution reaction is one of the important ways to convert solar energy into renewable hydrogen. In this work, the Co 9 S 8 hollow polyhedron was formed after sulfidation and calcination with the metal-organic framework ZIF-67. The hollow polyhedron Co 9 S 8 provides abundant support sites for Mn 0.05 Cd 0.95 S and effectively reduces the agglomeration degree of Mn 0.05 Cd 0.95 S. The Co 9 S 8 hollow polyhedron as the reaction site has a large specific surface area and a mesoporous structure, which is beneficial to the progress of the photocatalytic reaction. A series of tests showed that the introduction of Co 9 S 8 hollow polyhedron significantly improved the light-trapping ability and exposed more reaction sites. Co 9 S 8 hollow polyhedrons are used as electron capture sites, which can effectively collect electrons and induce the interface charge transfer of Mn 0.05 Cd 0.95 S to Co 9 S 8 . Because the Co 9 S 8 -Mn 0.05 Cd 0.95 S composite catalyst had a strong light-trapping ability, abundant reaction sites and Co 9 S 8 -Mn 0.05 Cd 0.95 S heterojunction accelerate the separation and transfer of charges. Therefore, the hydrogen evolution rate of the 10%Co 9 S 8 -Mn 0.05 Cd 0.95 S composite catalyst was relatively high, which was 13.369 mmol g −1 h −1 . In addition, the 10%Co 9 S 8 -Mn 0.05 Cd 0.95 S composite catalyst still has good hydrogen evolution stability after four cycles. This research may supply a new idea for the preparation of high-efficiency photocatalysts with hollow structures. Novelty Statement The Co 9 S 8 hollow polyhedron provides abundant support sites for M 0.05 C 0.95 S particles, which effectively reduces the degree of agglomeration. The Co 9 S 8 -M 0.05 C 0.95 S heterojunction catalyst not only accelerates the migration and transfer of electrons, but also provides abundant reaction sites. Therefore, the Co 9 S 8 -M 0.05 C 0.95 S composite catalyst has good catalytic activity.
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高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2021
·Vol. 45
·期 6
·8577-8592
·
IF 5.164
Wei Han,Wei Wang,Yongqiang Zhang,Yijie Wang,Mei Li,Yang Sun
Summary To recover Pr from molten chlorides, the electrode reactions of Pr 3+ on Sn-coated W and liquid Sn electrodes were studied by a group of electrochemical techniques. CV and SWV results exhibited that the electrochemical signals pertaining to the formation of Pr-Sn alloy compounds and solid solution appeared at less negative potentials than that of Pr 3+ on W electrode. The thermodynamic data of Pr-Sn alloy compounds and the kinetic parameters for PrSn 3 /Pr 3+ pair were determined employing OCP, LP, and Tafel methods, separately. The measured diffusion coefficient ( D ) of Pr in liquid Sn metal was 9.40 × 10 −6 cm 2 s −1 . Furthermore, the electrochemical recovering Pr from molten salt was performed using liquid Sn as a working electrode, and the formed Pr-Sn samples characterized by XRD and SEM-EDS were composed of Sn and PrSn 3 phases.
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高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2020
·Vol. 45
·期 5
·7120-7128
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IF 3.741
Menglu He,Jia Jia,Qing Sun,Weixin Zhang
SUMMARY Li-O 2 battery has attracted much attention due to its ultra-high theoretical energy density in the field of electrochemical energy storage. The introduction of efficient electrocatalyst can effectively accelerate the reaction rate of ORR and OER, so as to improve the coulomb efficiency and poor cycle stability of Li-O 2 battery. In this work, a novel hollow N-doped carbon sphere is prepared by using MOF and polystyrene as template, and act as highly efficient oxygen electrocatalyst for rechargeable Li-O 2 batteries. The hollow structure can provide enough oxygen diffusion channel, deposition and decomposition space for reduction products. N doping into the hollow carbon structure can increase the charge density of adjacent carbon atoms and enhance its catalytic activity of ORR/OER. As a result, the Li-O 2 battery using the hollow N-doped carbon sphere as air cathode exhibited an high specific capacity of 18 762 mAh/g (at a current density of 500 mA/g) and remarkable cycling stability of 212 cycles (at a current density of 500 mA/g and limited capacity of 1000 mAh/g), outperforming the carbon material with common structure. This work highlights the importance of air cathode structure and efficient catalyst, provides a new idea for the design of air cathode of Li-O 2 battery, and expands the scope of future research.
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高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2020
·Vol. 45
·期 4
·6227-6238
·
IF 3.741
Xiangxiang Du,Xuejun Shi,Yanling Li,Kesheng Cao
Summary Herein, N, S-co-doped graphene hydrogel (N/SGH) was first prepared by one-pot feasible hydrothermal approach using thiourea as a dopant for both N and S sources. And then, polyaniline (PANI) was grown on the surface of N, S-co-doped graphene hydrogel via simple adsorption of aniline monomer and in situ polymerization process. The N, S-co-doped graphene/polyaniline (N/SGH/PANI) composite hydrogel was fabricated as a free-standing and binder-free electrode material. Due to the co-doped synergistic effect, the N/SGH electrode exhibited enhanced electrochemical performances. The N/SGH electrode displays a specific capacitance of 130.4 F/g at 0.5 A/g. Compared with pure graphene hydrogel (GH), the specific capacitance of N/SGH and N-doped graphene (NGH) electrodes at 0.5 A/g increased by 53% and 20%, respectively. PANI pseudocapacitor material was introduced to further improve its capacitive performance. The resultant N/SGH/PANI composite electrode could achieve a max specific capacitance of 236.5 F/g at 0.5 A/g. In addition, N/SGH/PANI composite electrode showed stable cycle performance with the capacity retention of 95.1% after 1000 cycles performed at 10 A/g. Those provide a fabrication strategy for the design of high-performance supercapacitors electrode materials.
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高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2020
·Vol. 45
·期 2
·2899-2911
·
IF 3.741
Guorong Wang,Zhiliang Jin,Tiansheng Zhao
Summary In this study, a series of nickel/vanadium composites were acquired via a simple in situ growth strategy with the sodium chloride as a regulator. The phase, component, and electrochemical energy storage behavior of the as-prepared electrodes were investigated. Thanks to the addition of sodium chloride for the accession of oxygen vacancy, the prepared composite electrodes show excellent supercapacitor behavior. The resultant NVC-1.8Ov electrode demonstrates a impressive specific capacitance of 9.41 F cm −2 at a current of 10 mA cm −2 , which is about 1.5 times than the NVC electrode. After 5000 charge-discharge cycles under a current of 40 mA cm −2 , the retained 75.7% of its initial capacitance indicate a good cyclic stability. In addition, the NVC-1.8Ov and activated carbon (AC) was used to assemble NVC-1.8Ov//AC asymmetric supercapacitor, which deliver a maximum energy density of 0.471 mWh cm −2 at a power density of 9.319 mW cm −2 . This work provides a new and simple strategy for the preparation of high specific capacitance of asymmetric supercapacitor positive electrode.
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高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2020
·Vol. 45
·期 2
·2058-2069
·
IF 3.741
Junkai Gao,Xi Tang,Yan Chen,Yi Liu
Summary The thermal conductivity of shape-stabilized phase change material of polyethylene glycols/porous carbon microspheresdoping withcopper particles (PEG/CARM-Cu) was enhanced based on the adsorption and in situ reduction of Cu 2+ using polydopamine microsphere (PDAM)material as the adsorbent. The synthesis of PDAM has the merits of simplicity and environmental friendliness, and the in situ reduction of Cu 2+ through pyrolysis has the advantages of easy operation and cost effectiveness. Copper particles prepared by in situ reduction were tightly fixed on the surface of the support ofporous carbon microsphere (CARM), which avoided the sedimentation of copper particles during the phase change process of PEG/CARM-Cu. According to the SEM, TEM, XRD, TGA and DSC test results, PEG/CARM-Cu possessed favorable thermal reliability and stability, and the phase change enthalpy of PEG/CARM-Cu-2 could reach 101.50 J/g. Additionally, the thermal conductivity of PEG/CARM-Cu-2 (0.497 W/(m·K)) was enhanced by 93.3% compared to that ofpure PEG (0.257 W/(m·K)). Therefore, the PEG/CARM-Cu developed in this paper possessed great potential for real applications.
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高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2020
·Vol. 45
·期 2
·3305-3314
·
IF 3.741
Zhong Ma,Shuai Zhang,Yonggang Lu
Summary NiFe 2 O 4 presents high redox activity and good promoted application prospect in chemical looping processes. However, phase segregation caused by outward diffusion of Fe cations often lead to low cycling stability for NiFe 2 O 4 . In this study, the inherent mechanism of phase segregation for NiFe 2 O 4 was investigated deeply. The results indicated that reduction degree exhibited significant influence on the phase segregation of NiFe 2 O 4 in successive redox cycles. When NiFe 2 O 4 was reduced to Ni and Fe 3 O 4 in redox cycles, NiFe 2 O 4 displayed stable redox activity without phase segregation. As the reduction degree reached to FeO and FeNi, a needle-like structure with Fe enrichment was formed on the surface of the first cycled NiFe 2 O 4 . In the subsequent redox cycles with deep reduction degree, both severe phase segregation and deactivation were occurred for spent NiFe 2 O 4 sample. It can be seen that phase segregation is the main reason for the deactivation of NiFe 2 O 4 instead of surface sintering in redox cycles. The results of this work provide guidance for the development of NiFe 2 O 4 -based oxygen carriers with high redox performance.
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高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2021
·Vol. 45
·期 6
·9396-9407
·
IF 5.164
Jiao Zhang,Shun-Sheng Zhao,Zheng Yang,Zaiwen Yang,Shuilan Yang,Xiangrong Liu
Summary The liquid products of biodegradation of coal (LPBC) without further separation and purification are generally difficult to apply. In this study, a simple and low-cost method had been described for the preparation of carbon dots (CDs) by hydrothermal treatment of original LPBC. The as-synthesized CDs scence emission intensity when possessed narrowly distributed sizes and a mean diameter of 3.5 nm, and they showed significant excitation-dependent fluorescence emission. Meanwhile, the CDs exhibited good water solubility and photo-, metal ions-stability. Furthermore, the fluorescent emission intensity of CDs had been demonstrated sensitivity to pH value and temperature, showing great promise in sensor application.
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高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2020
·Vol. 45
·期 4
·6273-6284
·
IF 3.741
Xiaolin Shao,Qi Zhang,Xurui Zhang,Jin Yi,Yuyu Liu,Jiujun Zhang
Summary A facile method is developed to fabricate nanoporous, structured, Sn-based catalyst electrodes. Sn, Zn, and multiwalled carbon nanotubes (MWCNTs) are co-electrodeposited on a copper substrate, followed by chemical dezincification in NaOH aqueous solution to remove Zn. By controlling variables such as the contents of Zn and MWCNTs, a series of Sn-MWCNT/Cu (S Z MC) electrodes are fabricated. Experimental results show that using such novel S Z MC electrodes can achieve a HCOO − Faradaic efficiency of over 91% at −0.99 V versus RHE for 10 hours in CO 2 -saturated 0.5 M KHCO 3 aqueous solution. The high performance is attributed to the addition of MWCNTs and Zn, followed by chemical dezincification to remove Zn and then create vacancies in the catalyst structure, which results in a special porous structure of S Z MC with large surface area. Then ECSA is used for enhancing the catalytic activity and selectivity of HCOO − production, as well as promoting intermediate adsorption and mass transfer.
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高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2021
·Vol. 45
·期 6
·9058-9068
·
IF 5.164
Yingying Ma,Jinyong Tian,Liang Li,Lingtong Kong,Song Liu,Kunkun Guo,Xuli Chen
Summary With the increasing challenge of energy, resource, and environment, it is highly desired to develop renewable energy and corresponding efficient energy storage technologies basing on reproducible materials. Recently, using biomass and biotechnology to prepare electrode material for energy storage devices is gaining growing attention. Here, we use biomass, celery, as a material source and developed a new way to prepare highly qualified graphitized porous carbon. Besides, instead of direct carbonization, the celery is first freeze-dried to protect the original elements and structure of biomass. Furthermore, to sculpture more nanoscale pores in the produced material, the following carbonization process is also greatly modified by investigating proper carbonization temperature and time. Therefore, the interconnected hierarchical porous structure can be formed based on the protected original pores with size of micrometers and the newly formed pores with size of nanometers. The resulted interconnected hierarchical porous carbon is used to prepare supercapacitor electrode and exhibit excellent energy storage properties. Without any extra activating or doping process, the specific capacitance of the resulted electrode reached 350.0 F g −1 at 1 A g −1 , which is 5.28 times of that of directly carbonized material. And the power density reached 8.0 kW kg −1 with the energy density maintaining 16.3 Wh kg −1 .
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高影响因子
危险品化学品经营许可证（带存储）