Hierarchical carbon microflowers supported defect-rich Co3S4 nanoparticles: An efficient electrocatalyst for water splitting

被引:104
作者
Zhu, Xiaojing [1 ,2 ]
Dai, Jiale [1 ]
Li, Ligui [1 ,2 ,3 ]
Zhao, Dengke [1 ]
Wu, Zexing [4 ]
Tang, Zhenghua [1 ]
Ma, Li-Jun [5 ]
Chen, Shaowei [1 ,6 ]
机构
[1] South China Univ Technol, Sch Environm & Energy, New Energy Res Inst, Guangzhou 510006, Peoples R China
[2] Guangdong Univ Petrochem Technol, Guangdong Prov Key Lab Petrochem Pollut Proc & Co, Maoming 525000, Peoples R China
[3] South China Univ Technol, Key Lab Pollut Control & Ecosyst Restorat Ind Clu, Minist Educ, Guangzhou 510641, Peoples R China
[4] Qingdao Univ Sci & Technol, Coll Chem & Mol Engn, State Key Lab Base Ecochem Engn, 53 Zhengzhou Rd, Qingdao 266042, Peoples R China
[5] South China Normal Univ, Sch Chem & Environm, Key Lab Theoret Chem Environm Minist Educ, Guangzhou 510631, Peoples R China
[6] Univ Calif Santa Cruz, Dept Chem & Biochem, 1156 High St, Santa Cruz, CA 95064 USA
基金
中国国家自然科学基金; 美国国家科学基金会;
关键词
Oxygen evolution reaction; Hydrogen evolution reaction; Overall water splitting; Unconventional sulfurization; Cobalt sulfide; POT AQUEOUS STRATEGY; OXYGEN REDUCTION; BIFUNCTIONAL ELECTROCATALYST; EVOLUTION REACTION; METAL SULFIDES; COBALT; NANOSPHERES; NITROGEN; ARRAYS; NANOSHEETS;
D O I
10.1016/j.carbon.2019.12.072
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Developing highly efficient and cost-effective bifunctional electrocatalysts for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) represents a judicious way to produce massive hydrogen fuel through electrochemical water splitting. Herein, defect-rich Co3S4 particles with a diameter less than 5 nm were in-situ grown on nitrogen-doped hierarchical carbon microflowers (Co3S4@FNC) through a simple hydrothermal method, in which an unconventional vulcanization process with the strongly coordinating ligand ethylenediamine and formaldehyde serving as structure-directive agents is resorted to effectively control the morphology of catalysts. The resultant Co3S4@FNC-Co3 comprises dense Co3S4 nanoparticles supported on ultrathin nitrogen-doped carbon nanosheets with a thickness of ca. 20 nm, as well as abundant defects on Co3S4 nanoparticles and highly porous textures on carbon microflowers. These nanostructure merits lead to efficient catalytic activities, featuring a small overpotential of only 250 mV and 140 mV for OER and HER electrocatalysis at 10 mV cm(-2). When Co3S4@FNC-Co3 is utilized as a bifunctional catalyst in an alkaline water electrolyzer, a bias of only 1.580 V is able to complement overall water splitting at 10 mA cm(-2). Results in present work may suggest a paradigm in the design and engineering of high-performance electrocatalysts based on nanocomposites of transition metal sulfides and carbons. (C) 2019 Elsevier Ltd. All rights reserved.
引用
收藏
页码:133 / 144
页数:12
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