Probing self-optimization of carbon support in oxygen evolution reaction  

作　　者：Wenjie Xu Dengfeng Cao Oyawale Adetunji Moses Beibei Sheng Chuanqiang Wu Hongwei Shou Xiaojun Wu Shuangming Chen Li Song 

机构地区：[1]National Synchrotron Radiation Laboratory,CAS Center for Excellence in Nanoscience,University of Science and Technology of China,Hefei,230026,China [2]Materials Interfaces Center,Shenzhen Institute of Advanced Technology,Chinese Academy of Science,Shenzhen,440305,China [3]Institutes of Physical Science and Information Technology,Anhui University,Hefei,230601,China [4]Department of Materials Sciences and Engineering,School of Chemistry and Materials Sciences,University of Science and Technology of China,Hefei,230026,China

出　　处：《Nano Research》2021年第12期4534-4540,共7页纳米研究（英文版）

基　　金：This work was financially supported in part by the National Key R&D Program of China(Nos.2017YFA0303500 and 2020YFA0405800);National Natural Science Foundation of China(NSFC)(Nos.U1932201,U2032113,and 22075264);CAS Collaborative Innovation Program of Hefei Science Center(Nos.2019HSC-CIP002 and 2020HSC-CIP002);the USTC Start-Up Fund,and CAS Interdisciplinary Innovation Team;L.S.acknowledges the support from Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education);Nankai University(111 projects,B_(12)015).

摘　　要：Despite acknowledgment of structural reconstruction of materials following oxygen evolution reaction (OER) reaction, the role of support during the reconstruction process has been ignored. Given this, we directly in situ transform the residual iron present in raw single-walled carbon nanotubes (SWCNT) into Fe_(2)O_(3) and thus build Fe_(2)O_(3)-CNT as the model system. Intriguingly, an anomalous self-optimization occurred on SWCNT and the derived components show satisfactory electrochemical performance. Soft X-ray absorption spectroscopy (sXAS) analysis and theory calculation correspondingly indicate that self-optimization yields stronger interaction between SWCNT and Fe_(2)O_(3) nanoparticles, where the electrons migrate from Fe_(2)O_(3) to optimized SWCNT. Such polarization will generate a positive charge center and thus boost the OER activity. This finding directly observes the self-optimization of support effect, providing a new perspective for OER and related electrochemical reactions.

关 键 词：self-optimization of support single-walled carbon nanotube(SWCNT) oxygen evolution reaction(OER) Fe_(2)O_(3) soft X-ray absorption spectroscopy(sXAS) 

分 类 号：O64[理学—物理化学]