Electrolytic water splitting offers a prodigious amount of hydrogen and oxygen production, which could satisfy the demand for clean energy for building the community of human destiny. Thus, as the key technology barri...
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Electrolytic water splitting offers a prodigious amount of hydrogen and oxygen production, which could satisfy the demand for clean energy for building the community of human destiny. Thus, as the key technology barrier, the development of a low-cost and high-performance bifunctional transition metal electrocatalyst toward water splitting is still a challenge. In this work, aiming to enhance electrocatalytic performance, the nickel molybdenum nitride heterostructure nanowire arrays were synthesized on nickel foam (Ni3N-Mo2N/NF) via hydrothermal strategy followed by a direct nitridation, from which the heterostructure nanowire was achieved. The self-supporting Ni3N-Mo2N/NF electrodes exhibits very low over potentials of 66 and 252 mV at 10 mA cm(-2) for the hydrogen evolution reaction and oxygen evolution reaction, respectively. When the cathode and anode were both Ni3N-Mo2N/NF, a current density of 10 mA cm(-2) was achieved with only 1.55 V. This work provides a new idea for the design and preparation of non-precious metal-based transition metal nitride catalysts. (C) 2022 Elsevier B.V. All rights reserved.
Electrodes in new function-flexible optoelectronic devices,need to meet the requirements of foldability and high *** last decades,thousands of research about copper and silver nanowires promoted the prosperity of phot...
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Electrodes in new function-flexible optoelectronic devices,need to meet the requirements of foldability and high *** last decades,thousands of research about copper and silver nanowires promoted the prosperity of photovoltaic *** this paper,we focus on the recent progresses of silver and copper nanowires for high transparent solar cell application,including preparation and optimization *** addition,the primary obstacles of nanowire transparent electrodes in perovskite solar cells,organic solar cells and dye sensitized solar cells were ***,the application prospects of nanowire-based high transparent solar cells were outlined.
Two versions of the Chinese Academy of Sciences Flexible Global Ocean-Atmosphere-Land System model(CASFGOALS),version f3-L and g3,are used to simulate the two interglacial epochs of the mid-Holocene and the Last Inter...
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Two versions of the Chinese Academy of Sciences Flexible Global Ocean-Atmosphere-Land System model(CASFGOALS),version f3-L and g3,are used to simulate the two interglacial epochs of the mid-Holocene and the Last Interglacial in phase 4 of the Paleoclimate Modelling Intercomparison Project(PMIP4),which aims to study the impact of changes in orbital parameters on the Earth’s *** the PMIP4 experimental protocols,four simulations for the mid-Holocene and two simulations for the Last Interglacial have been completed,and all the data,including monthly and daily outputs for the atmospheric,oceanic,land and sea-ice components,have been released on the Earth System Grid Federation(ESGF)*** datasets contribute to PMIP4 and CMIP6(phase 6 of the Coupled Model Intercomparison Project)by providing the variables necessary for the two interglacial *** this paper,the basic information of the CAS-FGOALS models and the protocols for the two interglacials are briefly described,and the datasets are validated using proxy *** suggest that the CAS-FGOALS models capture the large-scale changes in the climate system in response to changes in solar insolation during the interglacial epochs,including warming in mid-to-high latitudes,changes in the hydrological cycle,the seasonal variation in the extent of sea ice,and the damping of interannual variabilities in the tropical ***,disagreements within and between the models and the proxy data are also *** datasets will help the modeling and the proxy data communities with a better understanding of model performance and biases in paleoclimate simulations.
Regional distribution network operation can be conducive for privacy protection, efficient calculation, grid modularity, and network scalability, which awfully tally with decentralized energy trade mechanism—peer-to-...
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ISBN:
(纸本)9781665414401
Regional distribution network operation can be conducive for privacy protection, efficient calculation, grid modularity, and network scalability, which awfully tally with decentralized energy trade mechanism—peer-to-peer (P2P) market. This article proposes a multi-regional coordinated P2P energy trading market mechanism to achieve consensus by exchanging coupled information. At the regional grid level, lower level distribution systems operators (DSOs) coordinate the P2P market and ancillary service to attain market clear according to the coupled information shared by adjacent regions, such as the distribution locational marginal prices} {(DLMPs) and voltage of regional slack bus. In distribution grid levels, each region achieves consensus upon power flow by alternating direction method of multipliers (ADMM). The distribution grid model is established by Distflow-based linearized model and sensitivity factors to eliminate the higher nonlinearities in power flow. Finally, the case studies demonstrate the economic efficiency of the proposed multiregional market mechanism.
This work investigates the intrinsic radioactivity of Lu2(1-x)Y2xSiO5:Ce (LYSO:Ce) crystals grown by Czochralski method (Cz) with various yttrium (shortened as Y) contents (x= 0-100 at.%). Energy spectra of the crysta...
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This work investigates the intrinsic radioactivity of Lu2(1-x)Y2xSiO5:Ce (LYSO:Ce) crystals grown by Czochralski method (Cz) with various yttrium (shortened as Y) contents (x= 0-100 at.%). Energy spectra of the crystals excited with Cs-137 and the intrinsic radioactivity related to Lu-176 atoms as a function of Y content were investigated. It is illustrated that the intrinsic radioactivity depends on the content of Y, which also affects the energy spectrum and energy resolution of LYSO crystal. Results show that energy resolution of LYSO:Ce crystals can be improved by subtracting background spectra from the energy spectra. The experiment result also confirms the size effect of intrinsic radioactivity in LYSO:Ce crystal. For the LYSO crystal in large size, the influence of intrinsic radioactivity on the energy spectrum cannot be ignored, while it can be weakened by background subtracting.
本研究分析了广西典型海湾表层沉积物8种重金属(As、Cd、Cr、Cu、Hg、Ni、Pb和Zn)的赋存形态,采用改进的三级连续提取法对不同形态的重金属进行提取,并探究沉积物重金属形态与理化性质之间的相关性,基于可利用形态重金属含量计算次生相与原生相比值(ratio of secondary phase to primary phase,RSP)和风险评估编码(risk assessment code,RAC),进而对表层沉积物进行潜在生态风险评估。结果表明,广西近岸海湾表层沉积物中弱酸可提取态Cd最高(62.37%),其次是可还原态Pb(46.04%)和可氧化态Hg(49.79%),而As(88.90%)、Cr(63.82%)、Cu(52.05%)、Ni(52.90%)和Zn(43.65%)以残渣态为主,稳定性较好;弱酸可提取态Cu、Ni、Pb和Zn易于在富含氮、磷和总有机碳的环境下释放,生物可利用态Cu、Ni和Pb易于结合黏土质沉积物,而pH对各重金属赋存形态释放的影响较低;Zn和Ni的RAC值分别为17.16%和12.11%,处于低风险,Cd的RSP值和RAC值分别为8.24和62.37%,处于重度污染水平和高风险,应优先防控。
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