自支撑NiSe/CoCr-LDH双功能电催化剂的制备及其裂解海水性能研究  

Preparation of self-supported NiSe/CoCr-LDH bifunctional electrocatalysts for splitting seawater

作　　者：何作明 蒲睿熙 贺文 刘韵丹 HE Zuoming;PU Ruixi;HE Wen;LIU Yundan(School of Physics and Optoelectronics,Xiangtan University,Xiangtan 411105,China)

机构地区：[1]湘潭大学物理与光电工程学院,湖南湘潭411105

出　　处：《湘潭大学学报（自然科学版）》2024年第3期35-44,共10页Journal of Xiangtan University(Natural Science Edition)

基　　金：国家自然科学基金(12004321)。

摘　　要：硒化镍(NiSe)得益于其优异的电催化性能,如:高导电性、丰富的晶相及电子结构、合成方式多样便捷等,成为大多数电催化水分解研究者的首选材料.在探究电催化活性的过程中,NiSe不可避免地存在活性低、稳定性差等问题.这意味着:一方面,需要额外提供更高的能量才可以实现水的分解,大大降低了电催化水分解的效率;另一方面,较差的稳定性难以应用于电催化电解海水,无法解决未来实现能量转换的关键问题.为了提高NiSe的稳定性及电催化活性以实现高效长期电解海水,该文将钴铬层状双金属氢氧化物(CoCr-LDH)通过电沉积的方式覆盖在NiSe表面,对NiSe进行保护的同时,与其构成异质结构,显著降低了电催化析氢析氧所需的能量,所制备的生长在泡沫镍上的NiSe和CoCr-LDH异质结构(NiSe/CoCr-LDH/NF)应用于模拟碱性海水环境下的全解水系统,仅需要提供1.59 V电压,电流密度即可达到40 mA·cm^(-2),稳定工作16 h且无氯气产生,实现绿色高效的电解海水.该文为制备高效稳定电催化剂提供了新思路.NiSe has become the preferred material for most electrocatalytic water decomposition researchers due to its excellent electrocatalytic properties,such as high conductivity,rich crystalline and electronic structures,and diverse and convenient synthesis methods.In the process of exploring electrocatalytic activity,NiSe inevitably have problems such as low activity and poor stability,which means that on the one hand,it is necessary to provide additional higher energy to achieve water decomposition,greatly influence the efficiency of electrocatalytic water decomposition;On the other hand,poor stability is difficult to apply to electrocatalytic electrolysis of seawater,and cannot solve the key problem of achieving energy conversion in the future.In order to improve the stability and electrocatalytic activity of NiSe and achieve efficient long-term electrolysis of seawater,the CoCr-LDH was electrodeposited onto the surface of NiSe to protect it while forming a heterogeneous structure,significantly reducing the energy required for electrocatalytic hydrogen and oxygen evolution.The prepared NiSe and CoCr-LDH heterostructures grown on foam nickel(denoted as NiSe/CoCr LDH/NF)are used to the splitting water system in simulated alkaline seawater environment.Only requiring a low overpotential of 1.59 V to reach 40 mA·cm^(-2),and they can work stably for 16 h without chlorine gas production,realizing green and efficient electrolysis of seawater.It provides a new idea for the preparation of highly efficient and stable electrocatalysts.

关 键 词：过渡金属硫族化合物 层状双金属氢氧化物 双功能 电催化水分解 碱性模拟海水 

分 类 号：O646[理学—物理化学]