On-demand production of hydrogen by reacting porous silicon nanowires with water  

作　　者：Rui Ning Yue Jiang Yitian Zeng Huaxin Gong Jiheng Zhao Jeffrey Weisse Xinjian Shi Thomas M.Gill Xiaolin Zheng 

机构地区：[1]Department of Materials Science and Engineering,Stanford University,Stanford,CA 94305,USA [2]Department of Mechanical Engineering,Stanford University,Stanford,CA 94305,USA [3]Department of Chemical Engineering,Stanford University,Stanford,CA 94305,USA

出　　处：《Nano Research》2020年第5期1459-1464,共6页纳米研究（英文版）

基　　金：The authors acknowledge the support of the California Energy Commission,Stanford Natural Gas Initiative,and Stanford Hydrogen Focus Group.Part of this work was performed at the Stanford Nano Shared Facilities(SNSF),supported by the National Science Foundation under award ECCS-1542152.

摘　　要：On-demand hydrogen generation is desired for fuel cells,energy storage,and clean energy applications.Silicon nanowires(SiNWs)and nanoparticles(SiNPs)have been reported to generate hydrogen by reacting with water,but these processes usually require external assistance,such as light,electricity or catalysts.Herein,we demonstrate that a porous SiNWs array,which is fabricated via the metal-assisted anodic etching(MAAE)method,reacts with water under ambient and dark conditions without any energy inputs.The reaction between the SiNWs and water generates hydrogen at a rate that is about ten times faster than the reported rates of other Si nanostructures.Two possible sources of enhancement are discussed:SiNWs maintain their high specific surface area as they don’t agglomerate,and the intrinsic strain of the nanowires promotes the reactivity.Moreover,the porous SiNWs array is portable,reusable,and environmentally friendly,yielding a promising route to produce hydrogen in a distributed manner.

关 键 词：silicon nanowire porous silicon hydrogen generation metal-assisted anodic etching metal-assisted chemical etching water splitting 

分 类 号：TB383[一般工业技术—材料科学与工程]