低温共沉淀法合成多孔CoFe LDH纳米片电催化剂
收稿日期: 2020-06-15
网络出版日期: 2020-12-15
基金资助
国家自然科学基金项目(51862002);广西自然科学基金面上项目(2018GXNSFAA294049);广西石化资源加工及过程强化技术重点实验室项目(2018K008)
Preparation of porous CoFe LDH nanosheets electrocatalyst by low-temperature co-precipitation method
Received date: 2020-06-15
Online published: 2020-12-15
通过低温共沉淀技术合成了多孔CoFe层状双金属氢氧化物(CoFe LDH)纳米片。运用X射线衍射(XRD)、X射线光电子能谱(XPS)、扫描电镜(SEM)、透射电镜(TEM)等手段对产物的物相、组成及微观形貌进行了表征,并探讨了铁离子(Fe3+)含量对CoFe LDH纳米结构生长行为的影响,考察了制备的产物作为电催化剂在电解水析氧反应中的性能。结果表明,Fe3+的加入可以有效调节产物的形貌、结晶度和孔道结构。在合适的Co与Fe比例条件下,制备的CoFe LDH可形成多孔纳米片,且增大了总孔体积,增加了表面活性位点。同时,结晶CoFe LDH纳米片可促进Co和Fe离子间的电荷转移行为,从而提高产物的电催化活性。对于电解水析氧反应,当电流密度为10 mA/cm2时,结晶Co0.67Fe0.33 LDH多孔纳米片所需的过电势仅为291 mV,Tafel斜率为33 mV/dec,并展现出良好的循环稳定性。
龙俊禧 , 许雪棠 , 王凡 . 低温共沉淀法合成多孔CoFe LDH纳米片电催化剂[J]. 无机盐工业, 2020 , 52(12) : 98 -103 . DOI: 10.11962/1006-4990.2020-0045
Porous CoFe layered double hydroxide(CoFe LDH) nanosheets electrocatalyst was prepared by low-temperature co-precipitation method.The phase,composition and microstructure of the products were characterized by X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),scanning electron microscopy(SEM) and transmission electron microscopy (TEM).The effect of Fe3+ content on the growth behavior of CoFe LDH nanostructures and the electrocatalytic activity on oxy-gen evolution of electrolytic water reaction were discussed.The results showed that the morphology,crystallinity and pore structure of the product can be facilely tuned by the addition of Fe3+.Porous CoFe LDH nanosheets with large the total pore volume and enriched active sites were achieved under a suitable Co/Fe ratio.Meanwhile,CoFe LDH resulted in the improvement of the conductivity and the acceleration of charge exchange between Fe and Co active centers,thereby enhancing catalytic activity.For oxygen evolution of electrolytic water reaction,the obtained crystalline Co0.67Fe0.33 LDH nanosheets reached a current density of 10 mA/cm2 with an overpotential of a 291 mV and a tafel slope of 33 mV/dec,and showed good cycle stability.
[1] | Mahmood N, Yao Y, Zhang J, et al. Electrocatalysts for hydrogen evolution in alkaline electrolytes:Mechanisms,challenges,and prospective solutions[J]. Advanced Science, 2018,5(2):1700464. |
[2] | 何杨华, 徐金铭, 王发楠, 等. Ni-Fe基析氧阳极材料的研究进展[J]. 化工进展, 2016,35(7):2057-2062. |
[3] | Jamesh M, Sun X. Recent progress on earth abundant electrocatalysts for oxygen evolution reaction(OER) in alkaline medium to achieve efficient water splitting-A review[J]. Journal of Power Sources, 2018,400:31-68. |
[4] | 王雅, 方志强, 史晓雨, 等. 镍铁双金属系列电催化材料的研究进展[J]. 化学研究, 2018,29(6):638-641. |
[5] | 赵宇, 张硕嘉, 徐冰, 等. 锌基复合电极原位水热合成和电化学性能研究[J]. 无机盐工业, 2019,51(6):21-24. |
[6] | 谢博尧, 张纪梅, 郝帅帅, 等. 层状双氢氧化物析氧催化剂的研究进展[J]. 材料工程, 2020,48(1):1-9. |
[7] | Huang L, Zou Y, Chen D, et al. Electronic structure regulation on layered double hydroxides for oxygen evolution reaction[J]. Chinese Journal of Catalysis, 2019,40(12):1822-1840. |
[8] | 任锦, 梁良, 周瑜, 等. 功能化层状双金属氢氧化物材料的应用进展[J]. 材料科学与工程学报, 2019,37(3):509-516. |
[9] | Cai Z, Bu X, Wang P, et al. Recent advances in layered double hydroxide electrocatalysts for the oxygen evolution reaction[J]. Journal of Materials Chemistry A, 2019,7(10):5069-5089. |
[10] | Yin H, Tang Z. Ultrathin two-dimensional layered metal hydroxides:an emerging platform for advanced catalysis,energy conversion and storage[J]. Chemical Society Reviews, 2016,45(18):4873-4891. |
[11] | Yang Y, Ou Y, Yang Y, et al. Modulated transition metal-oxygen covalency in the octahedral sites of CoFe layered double hydroxides with vanadium doping leading to highly efficient electrocatalysts[J]. Nanoscale, 2019,11(48):23296-23303. |
[12] | Li J, Li X, Luo Y, et al. Cobalt carbonate hydroxide mesostructure with high surface area for enhanced electrocatalytic oxygen evolution[J]. International Journal of Hydrogen Energy, 2018,43(20):9635-9643. |
[13] | Yang Y, Dang L, Shearer M, et al. Highly active trimetallic NiFeCr layered double hydroxide electrocatalysts for oxygen evolution reaction[J]. Advanced Energy Materials, 2018,8(15):1703189. |
[14] | Cai Z, Zhou D, Wang M, et al. Introducing Fe2+ into nickel-iron alyered double hydroxide:local structure modulated water oxidation activity[J]. Angewandte Chemie International Edition, 2018,57(30):9392-9396. |
[15] | Yang T, Ye Q, Liang Y, et al. Graded holey nickel cobalt layered double hydroxide nanosheet array electrode with high mass loading for high-energy-density all-solid-state supercapacitors[J]. Journal of Power Sources, 2020,449:227590. |
[16] | 麦诗欣, 程高, 余林, 等. 碳纸负载钴氧化物的制备及电催化析氧性能研究[J]. 无机盐工业, 2020,52(1):87-92. |
/
〈 |
|
〉 |