Bulk nanoporous(np)metallic actuators have attracted increasing attention due to their large strain and low stimulation voltage.However,studies focusing upon the combined effect of composition and structure on the act...Bulk nanoporous(np)metallic actuators have attracted increasing attention due to their large strain and low stimulation voltage.However,studies focusing upon the combined effect of composition and structure on the actuation performance of metallic actuators are relatively scarce,and its underlying mechanism needs to be clarified Herein,a series of bulk np-NiPd samples with differen compositions and microstructures were fabricated using a dealloying-coarsening-dealloying strategy and chargecontrolled electrochemical dealloying,and the process involves only one component of precursor alloy.It has been found that the np-NiPd cubes show a composition/structure-dependent mechanical property and electrochemical actuation performance.Specially,the npNi_(70)Pd_(30)sample with a homogeneously porous structure and good network connectivity exhibits significantly larger strain amplitude and faster strain rate than other hierarchically porous NiPd samples(np-Ni_(50)Pd_(50)and npNi_(20)Pd_(80)).Moreover,the np-Ni_(70)Pd_(30)sample demonstrates good actuation stability with high strain retention after hundreds of cycles.Notably,the maximum strain amplitude(1.17%)is even comparable to that of advanced leadfree piezoceramic,and the maximum strain rate exceeds those of many reported metallic actuator materials.Our work indicates that good network connectivity plays a vita role in facilitating large/fast strain response in metallic actuators.展开更多
基金financially supported by the National Natural Science Foundation of China(Nos.U23A20554 and 52371158)the Key Research and Development Program of Shan dong Province(No.2021ZLGX01)+2 种基金Taishan Scholar Foundation of Shandong Province,the Natural Science Foundation of Shan dong Province(No.ZR2022QB169)the Excellent Youth Science Fund Project of Shan dong Province(Overseas)(No.2023HWYQ-018)the Postdoctoral Science foundation of China(No.2022M710077)。
文摘Bulk nanoporous(np)metallic actuators have attracted increasing attention due to their large strain and low stimulation voltage.However,studies focusing upon the combined effect of composition and structure on the actuation performance of metallic actuators are relatively scarce,and its underlying mechanism needs to be clarified Herein,a series of bulk np-NiPd samples with differen compositions and microstructures were fabricated using a dealloying-coarsening-dealloying strategy and chargecontrolled electrochemical dealloying,and the process involves only one component of precursor alloy.It has been found that the np-NiPd cubes show a composition/structure-dependent mechanical property and electrochemical actuation performance.Specially,the npNi_(70)Pd_(30)sample with a homogeneously porous structure and good network connectivity exhibits significantly larger strain amplitude and faster strain rate than other hierarchically porous NiPd samples(np-Ni_(50)Pd_(50)and npNi_(20)Pd_(80)).Moreover,the np-Ni_(70)Pd_(30)sample demonstrates good actuation stability with high strain retention after hundreds of cycles.Notably,the maximum strain amplitude(1.17%)is even comparable to that of advanced leadfree piezoceramic,and the maximum strain rate exceeds those of many reported metallic actuator materials.Our work indicates that good network connectivity plays a vita role in facilitating large/fast strain response in metallic actuators.
