DES合成高活性CoCO_(3)纳米片及析氧反应性能研究  

Synthesis of efficient cobalt carbonate nanosheets based on DES for oxygen evolution reaction

作　　者：刘亚超 谭晓杰 李旭东[1] 王瑞[1] 王慧[1] 韩璇 赵青山[1] LIU Yachao;TAN Xiaojie;LI Xudong;WANG Rui;WANG Hui;HAN Xuan;ZHAO Qingshan(College of Chemistry and Chemical Engineering,China University of Petroleum,Qingdao 266580,Shandong,China)

机构地区：[1]中国石油大学(华东)化学化工学院,山东青岛266580

出　　处：《化工学报》2024年第9期3320-3328,共9页CIESC Journal

基　　金：国家自然科学基金项目(22208375)。

摘　　要：氢能因其热值高、清洁无污染等优势,被认为是实现碳中和最有效的能源载体之一。电解水制氢是实现可持续制氢的有效途径。其中,析氧反应(OER)缓慢动力学过程导致水分解效率低下,迫切需要开发高效、稳定的电催化剂。利用多元醇、尿素与CoCl_(2)·6H_(2)O之间的配位作用形成超分子三元低共熔溶剂(DES)体系,通过一锅溶剂热法构建表面粗糙的二维CoCO_(3)纳米片,用于提升电催化OER效率,并针对醇羟基数量对CoCO_(3)形貌及性能影响进行了探究。研究表明,丙三醇、尿素和CoCl_(2)·6H_(2)O三元DES体系制备的CoCO_(3)-Gly催化剂,呈现更蓬松、更薄、更粗糙的片状结构,具有更加优异的OER性能,电流密度在10 mA·cm-2时过电位311 mV,经24 h稳定性测试电流保留率达99%。Hydrogen energy is considered as one of the most effective energy vectors to achieve carbon neutrality due to its high calorific value and clean,pollution-free characteristics.Electrolysis of water is an effective way to achieve sustainable hydrogen production.Among them,the slow kinetics of the oxygen evolution reaction(OER)leads to low water decomposition efficiency,and it is urgent to develop efficient and stable electrocatalysts.Herein,we utilize the coordination interaction between polyhydric alcohols,urea,and CoCl_(2)·6H_(2)O to form supramolecular ternary deep eutectic solvent(DES)systems.By employing a one-pot solvothermal method,surface-roughened two-dimensional CoCO_(3) nanosheets were constructed to enhance electrocatalytic OER efficiency.The impact of the number of alcohol hydroxyl groups on the morphology and performance of CoCO_(3)was studied.The research shows that the CoCO_(3)-Gly catalyst prepared by using a ternary DES system of glycerol,urea,and CoCl_(2)·6H_(2)O exhibits a more fluffy,thinner,and rougher sheet-like structure.The catalyst exhibits superior OER performance,with an overpotential of 311 mV at a current density of 10 mA·cm-2 and a current retention rate of 99%after 24 h of stability testing.

关 键 词：低共熔溶剂 碳酸钴 催化剂 电催化 析氧反应 多元醇 

分 类 号：TQ028.8[化学工程]