High-Performance NixCo3-xO4/Ti3C2Tx-HT Interfacial Nanohybrid for Electrochemical Overall Water Splitting

被引:33
作者
Xu, Peiwen [1 ]
Wang, Hehui [1 ]
Liu, Jun [1 ]
Feng, Xinzhen [1 ]
Ji, Weijie [1 ]
Au, Chak-Tong [2 ]
机构
[1] Nanjing Univ, Sch Chem & Chem Engn, Key Lab Mesoscop Chem, MOE, Nanjing 210023, Peoples R China
[2] Hong Kong Baptist Univ, Dept Chem, Kowloon Tong, Hong Kong 999077, Peoples R China
关键词
nickel cobalt oxide; hexagonal nanoplates; facet Ni doping; Ti3C2Tx overall water splitting; ELECTROCATALYTIC OXYGEN EVOLUTION; ELECTRONIC-PROPERTIES; CO3O4; NANOCRYSTAL; NANOSHEETS; EFFICIENT; MXENE; OXIDATION; REDUCTION; CATALYST; HYDROGEN;
D O I
10.1021/acsami.1c08032
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
This study highlights the facet structure control of regular NixCo3-xO4 nanoplates and interfacial modulation through elemental doping and morphologically fitted assembly of Ti3C2Tx nanosheets for high performances in OER/HER and overall water splitting. Over the resulting Ni0.09Co2.91O4/Ti3C2Tx-HT in a solution of 1 M KOH, the OER and HER overpotentials of 262 and 210 mV, respectively, are achievable at a current density of 10 mA cm(-2). In the case of the overall water splitting by using Ni0.09Co2.91O4/Ti3C2Tx-HT as anode and cathode catalysts, only a potential of 1.66 V is needed to obtain a current density of 10 mA cm(-2), and the catalysts can stand for a period of 70 h, remarkably outperforming the RuO2-Pt/C-based catalyst and benefiting from the intensive association and interfacial function between the Ti3C2Tx and NixCo(3)-xO(4) nanosheets. Interestingly, a surface reconstruction from the (112) to (111) facet structure occurred upon the fine-tuned Ni doping of regular NixCo(3-x)O(4) hexagonal nanoplates and led to a highly active catalyst surface. At x = 0.09, the amount of Ni3+ becomes the highest, which is favorable for the generation of the critical OH intermediates on NixCo3-xO4/Ti3C2Tx-HT. The current study documented the significance of the well-controlled interfacial assembly of transition-metal oxide/MXenes as an effective electrocatalyst in the OER/HER and overall water splitting processes and provided the insights into the structure-performance correlation over such kinds of precious metal-free catalysts.
引用
收藏
页码:34308 / 34319
页数:12
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