Metallic tin quantum sheets confined in graphene toward high-efficiency carbon dioxide electroreduction

被引：598

作者：

Lei, Fengcai ^{[1
]}

Liu, Wei ^{[2
]}

Sun, Yongfu ^{[1
,3
]}

Xu, Jiaqi ^{[1
]}

Liu, Katong ^{[1
]}

Liang, Liang ^{[1
]}

Yao, Tao ^{[2
,3
]}

Pan, Bicai ^{[1
]}

Wei, Shiqiang ^{[2
,3
]}

Xie, Yi ^{[1
,3
]}

机构：

[1] Univ Sci & Technol China, Collaborat Innovat Ctr Chem Energy Mat, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Anhui, Peoples R China

[2] Univ Sci & Technol China, Natl Synchrotron Radiat Lab, Hefei 230029, Anhui, Peoples R China

[3] Hefei Sci Ctr CAS, Hefei 230061, Anhui, Peoples R China

来源：

NATURE COMMUNICATIONS | 2016年 / 7卷

关键词：

CO2; REDUCTION; ELECTROCHEMICAL REDUCTION; OXIDE; CATALYSTS; MONOXIDE; LAYERS; NANOPARTICLES; ELECTRODES; CONVERSION; OXIDATION;

D O I：

10.1038/ncomms12697

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Ultrathin metal layers can be highly active carbon dioxide electroreduction catalysts, but may also be prone to oxidation. Here we construct a model of graphene confined ultrathin layers of highly reactive metals, taking the synthetic highly reactive tin quantum sheets confined in graphene as an example. The higher electrochemical active area ensures 9 times larger carbon dioxide adsorption capacity relative to bulk tin, while the highly-conductive graphene favours rate-determining electron transfer from carbon dioxide to its radical anion. The lowered tin-tin coordination numbers, revealed by X-ray absorption fine structure spectroscopy, enable tin quantum sheets confined in graphene to efficiently stabilize the carbon dioxide radical anion, verified by 0.13 volts lowered potential of hydroxyl ion adsorption compared with bulk tin. Hence, the tin quantum sheets confined in graphene show enhanced electrocatalytic activity and stability. This work may provide a promising lead for designing efficient and robust catalysts for electrolytic fuel synthesis.

引用

页数：8

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