摘要：It has made significant progress in catalyst andreactor design for commercial current densities in CO_(2) electroreduction(CO_(2)ER).However,these catalyst systems haverarely been applied for a C2 gas product of ethane due to itscommonly inferior selectivity relative to other C1 and ***,bamboo-like amorphous Ni(OH)_(2) nanotubes wrapped cu nanoparticles composite(cu NPs@aNi(OH)_(2)NTs)are constructed for selective CO_(2)ER to ethane ina flow *** unique structure of cu NPs@a-Ni(OH)_(2) NTsprovides a confined geometry to improve the adsorption of thereactive *** interface of cu NPs and a-Ni(OH)_(2) NTs isstabilized by generating some NiOH *** producedcu@NiOH interface enhances the activation of CO_(2) to*C*OOH and strengthens the adsorption of*COL on cu sitefor more*COH formation and its dimerization for finalethane ***,amorphous Ni(OH)_(2) nanotubes promote water dissociation for the hydrogenation ofcarbonous intermediates,contributing to ethane *** synthesized cu NPs@a-Ni(OH)_(2) NTs can reach a Faradaicefficiency of 48.3%and a partial current density of−226.7 mA cm^(−2) for ethane at−0.7 V in a flow cell,with aremarkable stability for 24 *** work provides a rationalstrategy to engineer cu-based composite for selective CO_(2)ERto ethane in a flow cell.

摘要：Oleic acid surface-modified cu nanoparticles with an average size of 20 nm were prepared by liquid phase reducing reaction. The tribological performance and mechanism of nanocopper as additive were studied by means of tribotester, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and nanoindentation instrument. The results indicate that the modified nanocopper additive can significantly improve the wear resistance and reduce friction coefficient of base oil. A copper protective film is formed and contributes to the excellent tribological properties of nanocopper additive. On the basis of the film forming mechanism, a new in-situ repair method was designed and used to repair wear-out-failure injection pump plunger and barrel. Furthermore, the current research progress of nanoparticles as green energy-saving lubricating oil additives were presented.

摘要：The special electronic characteristics and high atom usage efficiency of metal-nitrogen-carbon(M-N-C)materials have made them extremely attractive for oxygen reduction reactions(ORRs).However,it is inevitable that hydrogen peroxide(H_(2)O_(2))will be formed via the two-electron pathway in ***,the cu nanoparticles(NPs)have been encapsulated into Ni doped hollow mesoporous carbon spheres(Ni-HMCS)to reduce the generation of H_(2)O_(2)in *** tests confirm that the introduction of cu NPs improves the ORR performance *** obtained cu/Ni-HMCS exhibits a half-wave potential of 0.82 V *** hydrogen electrode and a limited current density of 5.5 mA cm^(-2),which is comparable with the commercial Pt/***,cu/Ni-HMCS has been used in Zn-air battery,demonstrating a high power density of 161 mW cm^(-2)and a long-term recharge capability(50 h at 5 mA cm^(-2)).The theoretical calculation proposes a tandem catalysis pathway for cu/Ni multi-sites catalysis,that is,H_(2)O_(2)released from the Ni-N_(4)and cu-N_(4)sites migrates to the cu(111)face,on which the captive H_(2)O_(2)is further reduced to H_(2)*** work demonstrates an interesting tandem catalytic pathway of dual-metal multi-sites for ORR,which provides an insight into the development of effective fuel cell electrocatalysts.