Co0.85Se hollow spheres constructed of ultrathin 2D mesoporous nanosheets as a novel bifunctional-electrode for supercapacitor and water splitting

被引:32
作者
Hussain, Nadeem [1 ,2 ,4 ]
Wu, Fangfang [5 ]
Xu, Liqiang [1 ,2 ,3 ]
Qian, Yitai [1 ,2 ]
机构
[1] Shandong Univ, Key Lab Colloid & Interface Chem, Minist Educ, Jinan 250100, Shandong, Peoples R China
[2] Shandong Univ, Sch Chem & Chem Engn, Jinan 250100, Shandong, Peoples R China
[3] Nankai Univ, Minist Educ, Key Lab Adv Energy Mat Chem, Tianjin 300071, Peoples R China
[4] Shandong Univ, Shenzhen Res Inst, Rm A301,Virtual Univ Pk, Shenzhen 518057, Peoples R China
[5] Zhejiang Univ Technol, Coll Mat Sci & Engn, 18 Chaowang Rd, Hangzhou 310014, Zhejiang, Peoples R China
基金
中国国家自然科学基金;
关键词
hollow sphere; mesoporous; supercapacitor; energy density; oxygen evolution reaction; HIGHLY EFFICIENT; ELECTROCATALYST; CATALYSTS; NITRIDE;
D O I
10.1007/s12274-019-2528-z
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
Hollow spheres of Co0.85Se constructed by two-dimensional (2D) mesoporous ultrathin nanosheets were synthesized via simple and cost effective approach. Their bifunctional electrocatalytic-supercapacitive properties were obtained simultaneously due to synergistic effects between macroscopic morphological features and microscopic atomic/electronic structure of Co0.85Se. The as-synthesized hollow spheres of Co0.85Se that are constructed by 2D mesoporous ultrathin nanosheets exhibit inspiring electrochemical performance for supercapacitor, presenting maximum energy density at high power density (54.66 Wh center dot kg(-1) at 1.6 kW center dot kg(-1)) and long cycle stability (88% retention after 8,000 cycles). At the same time, the hollow spheres of Co0.85Se constructed by 2D mesoporous ultrathin nanosheets display excellent catalytic performance for oxygen evolution reaction (OER) due to special structure, high surface area and mesoporous nature of sheets, which achieve low overpotential (290 mV at 10 mA center dot g(-1)) and low Tafel slope (81 mV center dot dec(-1)) for long-term operation (only 7.8% decay in current density after 9 h). It could be envisioned that the proposed simple approach will pave a new way to synthesize other metal chalcogenides for energy conversion and storage technology.
引用
收藏
页码:2941 / 2946
页数:6
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