Dealloying-directed synthesis of efficient mesoporous CoFe-based catalysts towards the oxygen evolution reaction and overall water splitting

被引:72
作者
Han, Lulu [1 ]
Dong, Chaoqun [2 ]
Zhang, Chi [1 ]
Gao, Yulai [3 ,4 ,5 ]
Zhang, Jie [1 ]
Gao, Hui [1 ]
Wang, Ying [1 ]
Zhang, Zhonghua [1 ]
机构
[1] Shandong Univ, Sch Mat Sci & Engn, Minist Educ, Key Lab Liquid Solid Struct Evolut & Proc Mat, Jingshi Rd 17923, Jinan 250061, Shandong, Peoples R China
[2] Ecole Polytech Fed Lausanne EPFL, Inst Mat, CH-1015 Lausanne, Switzerland
[3] Shanghai Univ, State Key Lab Adv Special Steel, Shanghai 200072, Peoples R China
[4] Shanghai Univ, Shanghai Key Lab Adv Ferromet, Shanghai 200072, Peoples R China
[5] Shanghai Univ, Sch Mat Sci & Engn, Shanghai 200072, Peoples R China
基金
中国国家自然科学基金;
关键词
LAYERED DOUBLE HYDROXIDES; SPINEL STRUCTURE; FACILE SYNTHESIS; ENERGY FUTURE; IRON; ELECTROCATALYSTS; COBALT; REDUCTION; NICKEL; OXIDATION;
D O I
10.1039/c7nr06254k
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
It is a great challenge to design highly active, stable and low-cost catalysts for electrochemically splitting water to realize the clean energy generation and renewable energy storage. Herein, a facile one-step dealloying strategy was proposed to synthesize mesoporous CoFe-based oxides and layered double hydroxides (LDHs). Benefitting from the fast mass transfer and more active sites caused by the open mesoporous structure, the CoFe-based materials exhibit excellent electrocatalytic activities and stability towards the oxygen evolution reaction (OER) in an alkaline electrolyte (1 M KOH). The CoFe-LDH catalyst only needs an overpotential of 0.286 V to achieve 10 mA cm(-2), and a small Tafel slope of 45 mV dec(-1) for the OER. Moreover, an alkaline electrolyzer was constructed with the CoFe-LDH as both the anode and cathode. The electrolyzer delivers a current density of 10 mA cm (2) at a voltage of 1.69 V toward overall water splitting in the 1 M KOH solution.
引用
收藏
页码:16467 / 16475
页数:9
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