3D核壳结构NiMoO_(4)@CoFe-LDH纳米棒的高效析氧及全解水性能研究  

3D Core-shell Structured NiMoO_(4)@CoFe-LDH Nanorods:Performance of Efficient Oxygen Evolution Reaction and Overall Water Splitting

作　　者：岳全鑫 郭瑞华[1,2,3] 王瑞芬 安胜利[1,2,3] 张国芳 关丽丽[1,2] YUE Quanxin;GUO Ruihua;WANG Ruifen;AN Shengli;ZHANG Guofang;GUAN Lili(School of Materials Science and Engineering,Inner Mongolia University of Science&Technology,Baotou 014010,China;Inner Mongolia Key Laboratory of Advanced Ceramic Materials and Devices,Inner Mongolia University of Science&Technology,Baotou 014010,China;Key Laboratory of Green Extraction&Efficient Utilization of Light Rare-Earth Resources,Ministry of Education,Inner Mongolia University of Science&Technology,Baotou 014010,China)

机构地区：[1]内蒙古科技大学1.材料科学与工程学院 [2]内蒙古自治区先进陶瓷材料与器件重点实验室 [3]轻稀土资源绿色提取与高效利用教育部重点实验室,包头014010

出　　处：《无机材料学报》2024年第11期1254-1264,I0006,I0007,共13页Journal of Inorganic Materials

基　　金：国家自然科学基金(51864040,51962028,52162010);内蒙古自治区科技计划(2021GG0042);内蒙古自治区高等学校青年科技英才(NJYT22064);内蒙古自治区自然科学基金(2022MS05018,2022LHMS05021)。

摘　　要：电解水制氢因具有绿色环保、制氢纯度高等优点而得到了科学界的广泛关注。然而,电催化水分解过程中缓慢的阳极析氧反应(OER)极大地阻碍了电解水制氢的发展进程,使其在实际应用中面临着许多挑战。本研究采用水热和电沉积相结合的策略,成功在导电泡沫镍(NF)基底上制得了一种以晶体NiMoO_(4)纳米棒为“核”、非晶态CoFe-LDH纳米片为“壳”的新型三维(3D)核壳异质结构催化剂。这种特殊的3D核壳结构充分激发了NiMoO_(4)和CoFe-LDH的电催化潜力,极大地提升了电化学水分解反应的效率。通过NiMoO_(4)和非晶态CoFe-LDH的协同作用,NiMoO_(4)@CoFe-LDH/NF纳米催化剂产生了更多的活性位点,表现出了高效的电子转移能力和优异的OER电催化活性。电化学测试表明,当电沉积时间为60 s时,NiMoO_(4)@CoFe-LDH/NF具有最优异的电化学性能,在10和100 mA·cm^(−2)下的过电位η10和η100只有168和216 mV,且具有极小的Tafel斜率和出色的长期稳定性。同时,NiMoO_(4)@CoFe-LDH||NiMoO_(4)全解水系统也表现出了较低的驱动电压,在1.57 V电压下即可产生10 mA·cm^(−2)的电流密度。这项工作为设计开发高效的电解水催化材料提供了新的思路。Hydrogen generation from electrolyzed water has received extensive attention in the scientific community due to its green and environmentally friendly properties,as well as the high purity of hydrogen produced.However,the slow oxygen evolution reaction(OER)during electrocatalytic water splitting has significantly hampered the development of hydrogen production,posing numerous challenges in its practical application.In this study,a novel three-dimensional(3D)core-shell heterostructure catalyst with crystalline NiMoO_(4)nanorods as“core”and amorphous CoFe-LDH nanosheets as“shell”was successfully fabricated on a conductive nickel foam(NF)substrate by using a combination of hydrothermal and electrodeposition strategy.This special 3D core-shell structure fully stimulates the electrocatalytic potential of NiMoO_(4)and CoFe-LDH,which greatly enhances the efficiency of the overall water-splitting.Through the synergistic interaction of NiMoO_(4)and amorphous CoFe-LDH,the NiMoO_(4)@CoFe-LDH/NF nanocatalysts generates more active sites and exhibits highly efficient electron transfer ability and excellent OER electrocatalytic activity.Electrochemical tests show that NiMoO_(4)@CoFe-LDH/NF exhibits the most excellent electrochemical performance when the electrodeposition time is 60 s.The overpotentialsη10 andη100 at 10 and 100 mA·cm^(−2)are only 168 and 216 mV,respectively,which shows a very small Tafel slope and excellent long-term stability.Meanwhile,the overall water-splitting system of NiMoO_(4)@CoFe-LDH||NiMoO_(4)exhibits a low driving voltage,which can produce a current density of 10 mA·cm^(−2)at 1.57 V.In conclusion,this work provides new ideas for design and development of efficient catalytic materials for electrolyzed water.

关 键 词：析氧反应 水热和电沉积法 3D核壳结构 全解水 

分 类 号：TQ116[化学工程—无机化工]