摘要：Transition metal phosphides(TMPs)/carbonaceous matrices have gradually attracted attention in the field of energy *** this study,we presented nickel phosphide(Ni2P)nanoparticles anchored to nitrogen-doped carbon porous spheres(Ni2P/NC)by using metal-organic framework-Ni as the *** comprehensive encapsulation architecture provides closer contact among the Ni2P nanoparticles and greatly improves the structural integrity as well as the electronic conductivity,resulting in excellent lithium storage *** reversible specific capacity of 286.4 mA hg^-1 has been obtained even at a high current density of 3.0 Ag^-1 and 450.4 mA hg^-1 is obtained after 800 cycles at 0.5 Ag^-***,full batteries based on LiNi1/3Co1/3Mn1/3O2||Ni2P/NC exhibit both good rate capability and cycling *** study provides a powerful and indepth insight on new advanced electrodes in high-performance energy storage devices.

摘要：Amidst the development of photoelectrochemical(PEC)CO_(2) conversion toward practical application,the production of high-value chemicals beyond C1 compounds under mild conditions is greatly desired yet ***,through rational PEC device design by combining Au-loaded and N-doped TiO_(2) plate nanoarray photoanode with Zn-doped Cu_(2)O dark cathode,efficient conversion of CO_(2) to CH3COOH has been achieved with an outstanding Faradaic efficiency up to 58.1%(91.5%carbon selectivity)at 0.5 V ***/*** programmed desorption and in situ Raman spectra reveal that the Zn-dopant in Cu_(2)O plays multiple roles in selective catalytic CO_(2) conversion,including local electronic structure manipulation and active site modification,which together promote the formation of intermediate*CH2/*CH3 for C-C *** from that,it is also unveiled that the sufficient electron density provided by the Au-loaded and N-doped TiO_(2) plate nanoarray photoanode plays an equally important role by initiating multi-electron CO_(2) *** work provides fresh insights into the PEC system design to reach the multi-electron reduction reaction and facilitate the C-C coupling reaction toward high-value multicarbon(C2+)chemical production via CO_(2) conversion.

摘要：受地质构造、成岩作用等多方面因素影响,深层页岩的层理发育程度、脆性指数、岩石力学特性、最小水平主应力梯度及水平应力差都与中深层页岩有明显差异,使人工裂缝起裂压力更高,裂缝复杂程度更低,从而极大地影响了深层页岩气地层的体积压裂设计和安全施工。为此,利用大尺寸岩样,模拟研究了深层页岩气地层的水平应力差、压裂流体黏度、施工排量等地层和工艺参数及缝内暂堵措施对人工裂缝的起裂与扩展特征的影响规律。研究发现,裂缝起裂与扩展特性受层理胶结强弱、水平应力差及前置液黏度等因素影响较大,压裂裂缝容易沿层理起裂导致早期憋压超压,从而使施工失败,高应力差条件下裂缝扩展形态相对简单,前置中黏压裂液、缝内暂堵等措施有利于裂缝多次破裂、产生次生裂缝使裂缝复杂化。在此基础上,提出了密切割分段、短簇距射孔、组合液体及变排量施工等压裂优化设计方案,现场应用后深层页岩气产量获得了重要突破。

摘要：我国已进入高质量发展的新阶段,随着碳达峰、碳中和目标的提出,应加速构建绿色低碳循环的能源新发展格局。煤炭作为我国的基础能源类型,为经济平稳运行提供了坚实保障,但煤炭行业在效率、技术、市场、安全、环境等方面的发展不平衡不充分问题,已不再适应能源高质量发展、积极应对气候变化的新要求。本文系统分析了煤炭行业发展面临的3个不平衡、6个不充分问题,结合新形势下能源发展的新要求,界定了煤炭行业高质量发展内涵;从动力变革、质量变革、效率变革3个方面着手,构建了包含创新驱动、智能高效、多元经济、安全健康、绿色低碳5个维度共23个指标的三级评价指标体系,并应用GRA-TOPSIS综合评价法对煤炭行业发展水平进行了评价。研究提出了煤炭行业高质量发展的重点任务:创新驱动的绿色智能发展体系,协同融合的绿色低碳发展体系,竞争有序的市场体系,合作共赢的全面开放体系,高素质的人才队伍体系;从顶层制度安排、推进煤炭行业碳减排、提升煤炭产需平衡能力等方面给出了发展建议。