简单易得的自氧化纳米泡沫镍用于高性能析氢和析氧催化  

Facile self-oxidized Ni nano-foam as high-performance catalyst for hydrogen and oxygen evolution

作　　者：徐洪杰 王新朝 赵威 郭瑞娟 薛志勇 张涛 邵洋 姚可夫 Hongjie Xu;Xinchao Wang;Wei Zhao;Ruijuan Guo;Zhiyong Xue;Tao Zhang;Yang Shao;Kefu Yao(Institute for Advanced Materials,North China Electric Power University,Beijing 102206,China;Key Laboratory of Aerospace Materials and Performance(Ministry of Education),School of Materials Science and Engineering,Beihang University,Beijing 100191,China;Key Laboratory for Advanced Materials Processing Technology,Ministry of Education,School of Materials Science and Engineering,Tsinghua University,Beijing 100084,China;Center for Advanced Analysis and Computational Science,Zhengzhou University,Zhengzhou 450001,China)

机构地区：[1]Institute for Advanced Materials,North China Electric Power University,Beijing 102206,China [2]Key Laboratory of Aerospace Materials and Performance(Ministry of Education),School of Materials Science and Engineering,Beihang University,Beijing 100191,China [3]Key Laboratory for Advanced Materials Processing Technology,Ministry of Education,School of Materials Science and Engineering,Tsinghua University,Beijing 100084,China [4]Center for Advanced Analysis and Computational Science,Zhengzhou University,Zhengzhou 450001,China

出　　处：《Science China Materials》2023年第10期3855-3864,共10页中国科学（材料科学（英文版）

基　　金：supported by the National Natural Science Foundation of China(52271148,51971006 and 51971092);the Fundamental Research Funds for the Central Universities(2023MS092)。

摘　　要：开发组成简单、无贵金属、制备简洁的自支撑析氢、析氧催化反应(HER和OER)催化剂是电解水的关键需求之一.本文以Mg_(80)Ni_(20)非晶合金薄带为前驱体,采用一步脱合金法制备了具有自支撑结构的自氧化纳米泡沫镍,在电流密度为10 mA cm^(-2)时HER和OER的过电位仅分别为33.1和330 mV,且均具有长达100 h的长期稳定性.基于纳米泡沫镍的水电解槽达到10 mA cm^(-2)的外加电压仅为1.58 V.纳米泡沫镍独特的三维超细多孔结构显著促进了其表观活性,同时其Ni/NiO复合结构显著提高了本征HER活性.本工作验证了纳米泡沫金属是一种有潜力的高性能催化材料.Development of high-performance catalysts with facile,self-supporting,simple and noble-metal-free features for hydrogen and oxygen evolution reactions(HER and OER)is a long-lasting pursuit.Herein,a facile self-oxidized Ni nano-foam with self-supporting nanoporosity is obtained by single-step dealloying of Mg_(80)Ni_(20) metallic glass ribbons.The Ni nano-foam exhibits superior HER performance with an overpotential of 33.1 and 71.4 mV at the current density of 10 and 100 mA cm^(-2),and low OER overpotential of 330 mV at 10 mA cm^(-2).Outstanding long-term stability up to 100 h is confirmed for both HER and OER.A water electrolyzer based on the Ni nano-foam couple shows good stability and remarkable activity for overall water splitting,which requires 1.58 V to reach 10 mA cm-2.The geometry features of the Ni nano-foam,i.e.,three-dimensional structure,ultrafine size,high porosity and large surface area are highly beneficial for catalytic activity.The synergic effect of the Ni/NiO composite at the ligament skin is confirmed to decrease the free energy for hydrogen binding,facilitate the H-OH bond breaking and accelerate OH-ion formation,which significantly improves the intrinsic HER activity.The outstanding HER and OER performances of the self-oxidized Ni nano-foam validate the metal nano-foams as promising catalyst candidates,especially in view of the ultrafine nanoporous,self-supporting,composition regulation,single-step synthesis and massive fabrication features.

关 键 词：metallic glass DEALLOYING Ni nano-foam hydrogen evolution oxygen evolution 

分 类 号：TQ116.2[化学工程—无机化工] TQ426[一般工业技术—材料科学与工程] TB383.1