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hydrolytic dehydrogenation of ammonia borane catalyzed by poly(amidoamine) dendrimers-modified reduced graphene oxide nanosheets supported Ag_(0.3)Co_(0.7) nanoparticles

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Journal of Materials Science & Technology 2018年第12期34卷 2350-2358页

作者： Dandan Ke Jin Wang Hongming Zhang Yuan Li Lu Zhang Xin Zhao Shumin Han Hebei Key Laboratory of Applied Chemistry School of Environmental and Chemical EngineeringYanshan University State Key Laboratory of Metastable Materials Science and Technology Yanshan University School of Materials and Metallurgy Inner Mongolia University of Science and Technology

Poly(amidoamine) dendrimers-modified reduced graphene oxide nanosheets(PAMAM/rGO) composite was selected as a carrier of heterogeneous Ag0.3Co0.7nanoparticles in order to obtain an excellent catalyst for ammonia borane(AB) hydrolysis. During the synthetic processes, GO could easily assembled with PAMAM by the electrostatic and hydrogen-bonding interactions. Structural characterization revealed that Ag0.3Co0.7bimetallic nanoparticles with uniform size distribution of 5 nm are well dispersed on PAMAM/rGO composite architecture. Ag0.3Co0.7@PAMAM/rGO was found to be a highly active and reusable catalyst in hydrogen generation from the hydrolysis of AB with a turnover frequency value(TOF) of 19.79 molH2min-1molM-1at 25.0±0.1℃ and retained 75.4% of their initial activity with a complete release of hydrogen in five runs. The relatively high TOF value and low apparent activation energy(34.21 kJ mol-1) make these Ag0.3Co0.7@PAMAM/rGO NPs as a high-efficient catalyst for catalytic dehydrogenation of AB facilitating the development of practically applicable energy storage materials.

关键词： Ammonia borane Reduced graphene oxide Ammonia borane Ag_(0.3)Co_(0.7) bimetallic nanoparticles hydrolytic dehydrogenation

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Monolithically integrated CoP nanowire array： An on/off switch for effective on-demand hydrogen generation via hydrolysis of NaBH4 and NH3BH3

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Nano Research 2017年第2期10卷 595-604页

作者： Liang Cui Yuanhong Xu Li Niu Wenrong Yang Jingquan Liu Shandong Provincial Key Laboratory of Detection Technology for Tumor Markers College of Chemistry and Chemical Engineering Linyi University Linyi 276005 China College of Materials Science and Engineering Qingdao University Qingdao 266071 China School of Life and Environmental Sciences Deakin University Geelong 3217 VIC Australia

The issues of hydrogen generation and storage have hindered the widespread use and commercialization of hydrogen fuel cell vehicles. It is thus highly attractive, but the design and development of highly active non-noble-metal catalysts for on-demand hydrogen release from alkaline NaBH4 solution under mild conditions remains a key challenge. Herein, we describe the use of CoP nanowire array integrated on a Ti mesh （CoP NA/Ti） as a three-dimensional （3D） monolithic catalyst for efficient hydrolytic dehydrogenation of NaBH4 in basic solutions. The CoP NAFFi works as an on/off switch for on-demand hydrogen generation at a rate of 6,500 mL/（min.g） and a low activation energy of 41 kJ/mol. It is highly robust for repeated usage after recycling, without sacrificing catalytic performance. Remarkably, this catalyst also performs efficiently for the hydrolysis of NH3BH3.

关键词： monolithic catalyst CoP nanowire array on/off switch hydrolytic dehydrogenation borohydrides

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