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Hydrogen absorption-desorption cycle decay mechanism of palladium nanoparticle decorated nitrogen doped graphene

查看全文 作　　者：Jiao [1]Li;Chaonan [1]Jin;Ruijun [1]Qian;Chaoling [1,2]Wu;Yao [2,3]Wang;Yigang [2,3]Yan;Yungui [2,3]Chen 高影响力作者 机构地区：[1]Department of Advanced Energy Materials,College of Materials Science and Engineering,Sichuan University,Chengdu,610064,Sichuan Province,China;[2]Engineering Research Center of Alternative Energy Materials&Devices,Ministry of Education,Chengdu,610064,Sichuan Province,China;[3]Institute of New Energy and Low-Carbon Technology,Sichuan University,Chengdu,610065,China高影响力机构 出　　处：《Progress in Natural Science:Materials International》索引2021年第31卷第4期,共7页高影响力期刊 基　　金：financially supported by National Key R&D Program of China(No.2018YFB1502101);State Key Laboratory of Long-life High Temperature Materials(DECSKL202110),China;the Fundamental Research Funds for Central Universities,China。 摘　　要：As a hydrogen storage material,palladium nanoparticle decorated nitrogen doped graphene(Pd/N-r GO)has drawn much attention owing to its high absorption capacity at moderate conditions.However,its hydrogen absorption-desorption cycle performance,which is essential for their practical application,has been rarely studied.In this paper,a simple and convenient high temperature thermal reduction method was used to synthesize nitrogen-doped graphene decorated with Pd nanoparticles(Pd/N-r GO).Taken it as a representative,the hydrogen absorption-desorption cycle performance of Pd/N-r GO was investigated.The results showed that after three cycles the hydrogen storage capacity dropped from 2.9 wt%to 0.8 wt%at 25℃and 4 MPa pressure.It was found that the palladium nanoparticles shed from Pd/N-RGO sheet after cycle performance test,and then agglomerated.These phenomena will weaken the hydrogen spillover effect,leading to the decrease of hydrogen storage capacity.Meanwhile,decreased defects reduce the hydrogen absorption sites,which will thus deteriorate the hydrogen storage capacity. 关 键 词：Cycle performance Hydrogen storage Hydrogen spillover effect AGGLOMERATION DEFECTS
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