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Charge-controlled compositional/microstructural regulations and electrochemical actuation performance of bulk nanoporous Ni-Pd alloys

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Rare Metals 2024年第10期43卷 5305-5317页

作者： Fu-Quan Tan Qing-Guo Bai Bin Yu Jian-Feng Wang Zhong-Hua Zhang Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials(Ministry of Education) School of Materials Science and EngineeringShandong UniversityJinan 250061China School of Applied Physics and Materials Wuyi UniversityJiangmen 529020China Ira A.Fulton School of Engineering Arizona State UniversityTempeAZ85287USA

Bulk nanoporous(np)metallic actuators have attracted increasing attention due to their large strain and low stimulation ***,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 *** has been found that the np-NiPd cubes show a composition/structure-dependent mechanical property and electrochemical actuation ***,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 ***,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 *** work indicates that good network connectivity plays a vita role in facilitating large/fast strain response in metallic actuators.

关键词： Metallic actuators Bulk nanoporous NiPd electrochemical dealloying Actuation stability Good network connectivity

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A Chemical dealloying Approach for Pt Surface-enriched Pt_(3)Co Alloy Nanoparticles as Oxygen Reduction Reaction Electrocatalysts

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Chemical Research in Chinese Universities 2022年第4期38卷 991-998页

作者： CHEN Yuanda CHEN Yongting LIO Yuxiang CHEN Shengli College of Chemistry and Molecular Sciences Hubei Key Laboratory of Electrochemical Power SourcesWuhan UniversityWuhan430072P.R.China

Pt-based alloys are the optimal electrocatalysts for oxygen reduction reaction(ORR)*** of Pt-based alloys has shown to be an effective approach to improving ORR *** dealloying is controllable for morphology by changing electrochemical parameters but is difficult to scale up due to complex operation and energy *** dealloying is suitable for a large scale but it is not easy to control the morphology because highly corrosive acids(HNO_(3) or H2SO4)are commonly *** this work,a facile chemical dealloying method for Pt_(3)Co/C has been employed to synthesize electrocatalysts for ORR using weak acids and buffer solutions of different pH,which could slow down the dissolution rate for Co atoms and increase the diffusion time for Pt atoms to improve ORR *** can be observed that the mass activities(MA)of the Pt_(3)Co/C alloy after dealloying with H3PO4 and NaH2PO4/Na2HPO4 buffer solution of pH=6 are close to that after electrochemical dealloying process,and are more than two times that of commercial Pt/*** addition,Pt_(3)Co/C after dealloying with a buffer solution of pH=6 only showed a slight degradation in the half-wave potential and electrochemical surface area(ECSA)after stability test for 5000 cycles,which is more stable than commercial Pt/*** shows that by controlling pH of the solvent,the ORR activity can be further *** facile approach provides a new strategy to control morphology of Pt-based electrocatalysts by chemical dealloying,which can contribute to promising application for cathodic electrocatalysts design of proton exchange membrane fuel cells(PEMFCs).

关键词： Oxygen reduction reaction(ORR) Chemical dealloying electrochemical dealloying Pt-based alloy

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