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Rapid preparation of carbon-supported ruthenium nanoparticles by magnetic induction heating for efficient hydrogen evolution reaction in both acidic and alkalinemedia

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SusMat 2022年第3期2卷 335-346页

作者： Qiming Liu Bingzhang Lu forrest nichols Jeffrey Ko Rene Mercado Frank Bridges Shaowei Chen Department of Chemistry and Biochemistry University of CaliforniaSanta CruzCaliforniaUSA Department of Physics University of CaliforniaSanta CruzCaliforniaUSA

Ruthenium has been hailed as a competitive alternative for platinum toward hydrogen evolution reaction(HER),a critical process in electrochemical water *** this study,we successfully prepare metallic Ru nanoparticles supported on carbon paper by utilizing a novel magnetic induction heating(MIH)*** samples are obtained within seconds,featuring a Cl-enriched surface that is unattainable via conventional thermal *** best sample within the series shows a remarkable HER activity in both acidic and alkaline media with an overpotential of only-23 and-12 mV to reach the current density of 10 mA/cm^(2),highly comparable to that of the Pt/C *** studies based on density functional theory show that the excellent electrocatalytic activity is accounted by the surface metal-Cl species that facilitate charge transfer and downshift the d-band *** from this study highlight the unique advantages of MIH in rapid sample preparation,where residual anion ligands play a critical role in manipulating the electronic properties of the metal surfaces and the eventual electrocatalytic activity.

关键词： Cl-enriched surface density functional theory hydrogen evolution reaction magnetic induction heating ruthenium

Oxygen Reduction Reaction Catalyzed by Carbon-Supported Platinum Few-Atom Clusters:Significant Enhancement by Doping of Atomic Cobalt

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Research 2020年第1期2020卷 1756-1767页

作者： Bingzhang Lu Qiming Liu forrest nichols Rene Mercado David Morris Ning Li Peng Zhang Peng Gao Yuan Ping Shaowei Chen Department of Chemistry and Biochemistry University of California1156 High StreetSanta CruzCalifornia 950564USA Department of Chemistry Dalhousie University6274 Coburg RoadHalifaxNova ScotiaCanada B3H 4R2 International Center for Quantum Materials School of PhysicsPeking UniversityBeijing 100871China Electron Microscopy Laboratory School of PhysicsPeking UniversityBeijing 100871China Collaborative Innovation Centre of Quantum Matter Beijing 100871China

Oxygen reduction reaction(ORR)plays an important role in dictating the performance of various electrochemical energy *** platinum nanoparticles have served as the catalysts of choice towards ORR,minimizing the cost of the catalysts by diminishing the platinum nanoparticle size has become a critical route to advancing the technological ***,first-principle calculations show that carbon-supported Pt9 clusters represent the threshold domain size,and the ORR activity can be significantly improved by doping of adjacent cobalt *** is confirmed experimentally,where platinum and cobalt are dispersed in nitrogen-doped carbon nanowires in varied forms,single atoms,few-atom clusters,and nanoparticles,depending on the initial *** sample consisting primarily of Pt_(2~7)clusters doped with atomic Co species exhibits the best mass activity among the series,with a current density of 4:16Amg^(-1)_(Pt)at+0.85V *** that is almost 50 times higher than that of commercial Pt/C.

关键词： platinum Oxygen cobalt

Ultrafast Preparation of Nonequilibrium FeNi Spinels by Magnetic Induction Heating for Unprecedented Oxygen Evolution Electrocatalysis

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Research 2022年第4期2022卷 165-177页

作者： Bingzhang Lu Qiming Liu Chunyang Wang Zaheer Masood David J.Morris forrest nichols Rene Mercado Peng Zhang Qingfeng Ge Huolin L.Xin Shaowei Chen Department of Chemistry and Biochemistry University of California1156 High StretSanta CruzCalifornia 95064USA Department of Physics and Astronomy University of CaliforniaIrvineCalifornia 92697USA Department of Chemistry and Biochemistry Southern Ilinois UniversityCarbondaleIlinois 62901USA Department of Chemistry Dalhousie University6274 Coburg RoadHalifaxNSCanada B3H 4R2

Carbon-supported nanocomposites are attracting particular attention as high-performance,low-cost electrocatalysts for electrochemical water *** are mostly prepared by pyrolysis and hydrothermal procedures that are time-consuming(from hours to days)and typically difficult to produce a nonequilibrium ***,for the first time ever,we exploit magnetic induction heating-quenching for ultrafast production of carbon-FeNi spinel oxide nanocomposites(within seconds),which exhibit an unprecedentedly high performance towards oxygen evolution reaction(OER),with an ultralow overpotential of only+260 mV to reach the high current density of 100 mA cm^(-2).Experimental and theoretical studies show that the rapid heating and quenching process(ca.10^(3)K s^(-1))impedes the Ni and Fe phase segregation and produces a Cl-rich surface,both contributing to the remarkable catalytic *** from this study highlight the unique advantage of ultrafast heating/quenching in the structural engineering of functional nanocomposites to achieve high electrocatalytic performance towards important electrochemical reactions.

关键词： quenching Oxygen attracting

Ultrafast synthesis of cobalt/carbon nanocomposites by magnetic induction heating for oxygen evolution reaction

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Advanced Sensor and Energy Materials

Advanced Sensor and Energy Materials 2023年第1期2卷 14-23页

作者： Qiming Liu Samuel McNair forrest nichols Bingzhang Lu Bingzhe Yu Dingjie Pan Jamie Ko Amrinder Bhuller Frank Bridges Shaowei Chen Department of Chemistry and Biochemistry University of California1156 High StreetSanta CruzCA95064United States Department of Physics University of California1156 High StreetSanta CruzCA95064United States

Metal/carbon nanocomposites have shown great potential as high-performance,low-cost electrocatalysts owing largely to their unique metal-support *** nanocomposites are typically prepared by conventional pyrolysis that is tedious and ***,we report the ultrafast preparation of cobalt/carbon nanocomposites by magnetic induction heating(MIH)of metal organic frameworks within seconds under an inert *** resulting samples consist of cobalt nanoparticles encapsulated within defective carbon shells,and effectively catalyze oxygen evolution reaction(OER)in alkaline *** the series,the sample prepared at 400 A for 10 s exhibits the best OER performance,needing a low overpotential of+308 mV to reach the current density of 10 mA cm^(−2),along with excellent stability,and even outperforms commercial RuO_(2) at high *** is ascribed to the charge transfer between the carbon scaffold and metal *** X-ray absorption spectroscopy measurements show that the electrochemically produced CoOOH species is responsible for the high electrocatalytic *** results highlight the unique potential of MIH in the development of effective nanocomposite catalysts for electrochemical energy technologies.

关键词： Magnetic induction heating Electrocatalysis Oxygen evolution reaction Cobalt/carbon nanocomposite Operando X-ray spectroscopy