NiFe2O4/NiO纳米复合材料的制备及电催化水氧化性能

doi:10.7503/cjcu20170426

高等学校化学学报 ›› 2017, Vol. 38 ›› Issue (11): 1999.doi: 10.7503/cjcu20170426

NiFe₂O₄/NiO纳米复合材料的制备及电催化水氧化性能

冯晓磊, 曲宗凯, 陈俊, 王登登, 陈旭(), 杨文胜

北京化工大学, 化工资源有效利用国家重点实验室, 北京 100029

收稿日期:2017-07-04 出版日期:2017-11-10 发布日期:2017-10-30
作者简介:联系人简介: 陈旭, 女, 博士, 教授, 主要从事功能纳米材料的合成及电催化和电分析化学应用研究. E-mail: chenxu@mail.buct.edu.cn
基金资助:
国家自然科学基金(批准号: 21521005, 21656001)资助

NiFe₂O₄/NiO Nanocomposites as Electrocatalysts for Oxygen Evolution Reaction^†

FENG Xiaolei, QU Zongkai, CHEN Jun, WANG Dengdeng, CHEN Xu^*(), YANG Wensheng

State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China

Received:2017-07-04 Online:2017-11-10 Published:2017-10-30
Contact: CHEN Xu E-mail:chenxu@mail.buct.edu.cn
Supported by:
† Supported by the National Natural Science Foundation of China(Nos.21521005, 21656001)

摘要/Abstract

摘要：

以镍铁水滑石为单一前驱体, 通过高温焙烧制备了NiFe₂O₄/NiO纳米复合材料, 对该纳米复合材料在碱性介质中电催化水的氧化性能进行了研究. 结果表明, 相比于化学共沉淀法制备的单独NiFe₂O₄、 NiO及其物理混合物NiFe₂O₄+NiO, NiFe₂O₄/NiO纳米复合材料具有更高的电催化水氧化活性和更好的循环稳定性. 电流密度为10 mA/cm²时过电位仅为364 mV.

关键词: 尖晶石型金属氧化物, 氧析出反应, 分解水, 纳米复合材料

Abstract:

NiFe₂O₄/NiO nanocomposites were prepared by the thermal treatment of a single-source NiFe-layered double hydroxide precursor and were used as electrocatalysts for electrooxidation of water(oxygen evolution reaction, OER). The NiFe₂O₄/NiO nanocomposites exhibited much higher water oxidation activity and better stability than pure NiFe₂O₄, NiO and a physical mixture of NiFe₂O₄ and NiO synthesized by chemical coprecipitation method. A current density of 10 mA/cm² was reached at an overpotential of 364 mV in alkaline media. The good electrocatalytic performance for OER could presumably be attributed to that the well-dispersed heterogeneous structure of the nanocomposites prevented the aggregation of NiFe₂O₄ and resulted in a higher surface area and a smaller charge transfer resistance compared with the control samples.

Key words: Spinel-type metal oxide, Oxygen evolution reaction, Water splitting, Nanocomposites

中图分类号:

O646
O614

TrendMD:

冯晓磊, 曲宗凯, 陈俊, 王登登, 陈旭, 杨文胜. NiFe₂O₄/NiO纳米复合材料的制备及电催化水氧化性能. 高等学校化学学报, 2017, 38(11): 1999.

FENG Xiaolei, QU Zongkai, CHEN Jun, WANG Dengdeng, CHEN Xu, YANG Wensheng. NiFe₂O₄/NiO Nanocomposites as Electrocatalysts for Oxygen Evolution Reaction^†. Chem. J. Chinese Universities, 2017, 38(11): 1999.

图/表 9

Fig.1 SEM image(A), FTIR spectrum(B), XRD pattern(C) and EDS spectrum(D)of the NiFe-LDH precursor

Fig.2 XRD patterns of NiO(a), NiFe2O4(b),NiFe2O4/NiO(c)

Fig.3 SEM image(A), elemental mapping of Ni(B), Fe(C) and EDS spectrum(D) of NiFe2O4/NiO

Fig.4 TEM(A—C) and HRTEM(A'—C') images of NiO(A, A'), NiFe2O4(B, B') and NiFe2O4/NiO(C, C')

Fig.5 N2-sorption isotherms of NiO, NiFe2O4+NiO, NiFe2O4 and NiFe2O4/NiO

Fig.6 LSVs(A) and Tafel plots(B) of NiO(a), NiFe2O4+NiO(b), NiFe2O4(c) and NiFe2O4/NiO(d)

Fig.7 Nyquist plots of different catalyst-modified electrodes in 1 mol/L KOH solution at 1.72 V(vs. RHE)

Table 1 Comparison of the electrocatalytic performance of different catalysts for OER*

Catalyst	Onset potential/V (vs. RHE)	Overpotential at 10 mA·cm^-2·mV^-1	Slope of Tafel plot/ (mV·dec^-1)	Ref.
NiO	1.62	594	113	This work
NiFe₂O₄+NiO	1.57	474	85	This work
NiFe₂O₄	1.55	414	66	This work
NiFe₂O₄/NiO	1.51	364	60	This work
NiO/NiFe₂O₄	1.54		42	[23]
NiFe₂O₄		430	42	[27]
NiFe₂O₄		377	80	[28]
NiFe₂O₄ nanofibers	1.67		98	[29]
NiFe₂O₄	1.52	381	46	[30]

Fig.8 LSVs at initial and after 1000 CV cycles of NiO(A), NiFe2O4+NiO(B), NiFe2O4(C) and NiFe2O4/NiO(D)

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NiFe₂O₄/NiO纳米复合材料的制备及电催化水氧化性能

NiFe₂O₄/NiO Nanocomposites as Electrocatalysts for Oxygen Evolution Reaction^†

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