In situ formation of molecular Ni-Fe active sites on heteroatom-doped graphene as a heterogeneous electrocatalyst toward oxygen evolution

标题

In situ formation of molecular Ni-Fe active sites on heteroatom-doped graphene as a heterogeneous electrocatalyst toward oxygen evolution

作者

作者:Wang, J (Wang, Jiong)^[1 ]; Gan, LY (Gan, Liyong)^[2 ]; Zhang, WY (Zhang, Wenyu)^[1 ]; Peng, YC (Peng, Yuecheng)^[1 ]; Yu, H (Yu, Hong)^[3 ]; Yan, QY (Yan, Qingyu)^[3 ]; Xia, XH (Xia, Xinghua)^[4 ]; Wang, X (Wang, Xin)^[1 ]

期刊信息

摘要

Molecularly well-defined Ni sites at heterogeneous interfaces were derived from the incorporation of Ni2+ ions into heteroatom-doped graphene. The molecular Ni sites on graphene were redox-active. However, they showed poor activity toward oxygen evolution reaction (OER) in KOH aqueous solution. We demonstrated for the first time that the presence of Fe3+ ions in the solution could bond at the vicinity of the Ni sites with a distance of 2.7 angstrom, generating molecularly sized and heterogeneous Ni-Fe sites anchored on doped graphene. These Ni-Fe sites exhibited markedly improved OER activity. The Pourbaix diagram confirmed the formation of the Ni-Fe sites and revealed that the Ni-Fe sites adsorbed HO- ions with a bridge geometry, which facilitated the OER electrocatalysis.

关键词

KeyWords Plus:CATALYTIC WATER OXIDATION; CARBON-MONOXIDE; ARTIFICIAL PHOTOSYNTHESIS; REACTION DYNAMICS; CO2 REDUCTION; REDOX STATES; COMPLEXES; IRON; ELECTRODES; METAL

作者信息

作者信息

通讯作者地址:Wang, X (通讯作者)

Nanyang Technol Univ, Sch Chem & Biomed Engn, 62 Nanyang Dr, Singapore 637459, Singapore.   增强组织信息的名称     Nanyang Technological University & National Institute of Education (NIE) Singapore     Nanyang Technological University

地址:

	[ 1 ] Nanyang Technol Univ, Sch Chem & Biomed Engn, 62 Nanyang Dr, Singapore 637459, Singapore   增强组织信息的名称     Nanyang Technological University & National Institute of Education (NIE) Singapore     Nanyang Technological University
	[ 2 ] South China Univ Technol, Key Lab Adv Energy Storage Mat Guangdong Prov, Sch Mat Sci & Engn, Guangzhou 510641, Guangdong, Peoples R China   增强组织信息的名称     South China University of Technology
	[ 3 ] Nanyang Technol Univ, Sch Mat Sci & Engn, 50 Nanyang Ave, Singapore 639798, Singapore   增强组织信息的名称     Nanyang Technological University & National Institute of Education (NIE) Singapore     Nanyang Technological University
	[ 4 ] Nanjing Univ, Sch Chem & Chem Engn, Nanjing 210046, Jiangsu, Peoples R China   增强组织信息的名称     Nanjing University

电子邮件地址:wangxin@ntu.edu.sg

出版商

AMER ASSOC ADVANCEMENT SCIENCE, 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 USA

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