文献类型：期刊文献

英文题名：Unlocking the potential of graphene for water oxidation using an orbital hybridization strategy

作者：Yao, Yingfang[1];Xu, Zhe[1];Cheng, Feng[2];Li, Wenchao[1];Cui, Peixin[3];Xu, Guangzhou[1];Xu, Sheng[4];Wang, Peng[4];Sheng, Guodong[5];Yan, Yadong[1];Yu, Zhentao[1];Yan, Shicheng[1,4];Chen, Zhaoxu[2];Zou, Zhigang[1,4,6,7]

机构：[1]Nanjing Univ, ERERC, Collaborat Innovat Ctr Adv Microstruct, Coll Engn & Appl Sci, 22 Hankou Rd, Nanjing 210093, Jiangsu, Peoples R China;[2]Nanjing Univ, Sch Chem & Chem Engn, Nanjing 210093, Jiangsu, Peoples R China;[3]Chinese Acad Sci, Inst Soil Sci, Key Lab Soil Environm & Pollut Remediat, Nanjing 210008, Jiangsu, Peoples R China;[4]Nanjing Univ, Collaborat Innovat Ctr Adv Microstruct, Coll Engn & Appl Sci, 22 Hankou Rd, Nanjing 210093, Jiangsu, Peoples R China;[5]Shaoxing Univ, Sch Chem & Chem Engn, Shaoxing 312000, Peoples R China;[6]Nanjing Univ, Dept Phys, Jiangsu Key Lab Nano Technol, Natl Lab Solid State Microstruct, 22 Hankou Rd, Nanjing 210093, Jiangsu, Peoples R China;[7]Macau Univ Sci & Technol, Macau Inst Syst Engn, Macau 999078, Peoples R China

年份：2018

卷号：11

期号：2

起止页码：407

外文期刊名：ENERGY & ENVIRONMENTAL SCIENCE

收录：SCI-EXPANDED(收录号：WOS:000425283400017)、、EI(收录号：20180804822927)、Scopus(收录号：2-s2.0-85042178670)、WOS

基金：this work was supported primarily by the National Basic Research Program of China (2013CB632404), the National Natural Science Foundation of China (51572121, 21603098, 21633004 and U1508202), the International Science & Technology Cooperation Program of China (2014DFE00200), the State Key Laboratory of NBC Protection for Civilian (SKLNBC2014-09), the Natural Science Foundation of Jiangsu Province (BK20151265, BK20151383 and BK20150580), the program B for outstanding PhD candidate of Nanjing University (201702B084) and the Fundamental Research Funds for the Central Universities (021314380084). This work has benefited from the hard X-ray micro-analysis and spherical grating monochromator beamlines at CLS and the BL14W1 beamline at the Shanghai synchrotron radiation facility (SSRF).

语种：英文

外文关键词：Chromium compounds - Chromium metallography - Electrocatalysts - Electrolytes - Energy conversion - Graphene - Ions - Oxygen evolution reaction

外文摘要：Graphene-based electrocatalytic materials are potential low-cost electrocatalysts for the oxygen evolution reaction (OER). However, substantial overpotentials above thermodynamic requirements limit their efficiency and stability in OER-related energy conversion and storage technologies. Here, we embedded CrN crystals into graphene and in situ electrochemically oxidized them to construct graphene materials with encapsulated Cr6+ ions (Cr6+@G). These Cr6+@G materials exhibit the lowest OER overpotential of 197 mV at 10 mA cm(-2) and excellent stability over 200 h at a high current density of about 120 mA cm(-2) in an alkaline electrolyte. Spectroscopic and computational studies confirm a stable ion coordination environment significantly benefiting the downshift of the graphene Fermi level via hybridization of C p orbitals with d orbitals of Cr6+ ions that enhances the OER activity and stability.