碳化钒改性镍基催化剂的尿素电氧化性能  

Vanadium carbide modified nickel-based catalyst for urea electrooxidation

作　　者：田彦妮 袁立杰 张珂 赵晓红 杨伯伦[2] 王鹭 TIAN Yanni;YUAN Lijie;ZHANG Ke;ZHAO Xiaohong;YANG Bolun;WANG Lu(School of Civil Engineering,Chang′an University,Xi′an 710061,Shaanxi Province,China;School of Chemical Engineering and Technology,Xi′an Jiaotong University,Xi′an 710049,Shaanxi Province,China;Department of Chemical and Biological Engineering,The Hong Kong University of Science and Technology,Hong Kong 999077,China)

机构地区：[1]长安大学建筑工程学院,陕西西安710061 [2]西安交通大学化学工程与技术学院,陕西西安710049 [3]香港科技大学化学及生物工程学系,中国香港999077

出　　处：《化学工程》2024年第6期18-22,28,共6页Chemical Engineering(China)

基　　金：国家自然科学基金资助项目(22008189);陕西省自然科学基础研究计划项目(2019JQ-587);长安大学中央高校基本科研业务费专项资金资助项目(300102282101)。

摘　　要：尿素电解法以其在含尿素废水处理及制氢领域的节能环保前景而受到广泛关注,关键在于设计高效稳定的尿素电氧化催化剂。文中设计开发一种VC(碳化钒)改性的Ni-VC/MWCNTs(Ni基纳米复合催化剂)用于尿素电氧化可达到343.3 mA/mg的优异电流密度,其与Ni/MWCNTs催化剂相比具有更小的Tafel斜率和更低的电荷转移电阻。此外,在稳态条件下,Ni-VC/MWCNTs催化剂的电流密度也得到提高。X射线光电子能谱测试表明引入VC使得Ni更易失电子生成活性组分NiOOH,从而增强尿素电氧化性能。此外,在尿素电解池中,达到10 mA/cm^(2)的电流密度,以Ni-VC/MWCNTs作为阳极催化剂所需的电压比Ni/MWCNTs降低了近100 mV。结果表明Ni-VC/MWCNTs是一种优良的尿素电解催化剂,有望实现高效制氢和废水资源化利用。Urea electrolysis has attracted wide attention for its energy-saving and environmentally friendly prospects in the fields of urea-containing wastewater treatment and hydrogen production.The key issue is the design of efficient and stable catalysts for urea electrooxidation.The synthesis of VC(vanadium carbide)modified nickel-based catalysts supported on multi-walled carbon nanotubes(Ni-VC/MWCNTs)for UOR(urea electrooxidation reaction)was reported.Ni-VC/MWCNTs has a superior current density of 343.3 mA/mg.Particularly,Ni-VC/MWCNTs has a smaller Tafel slope and a lower charge transfer resistance compared with Ni/MWCNTs.Moreover,the current density under the steady state of Ni-VC/MWCNTs is also enhanced.XPS(X-ray photoemission spectroscopy)demonstrates that the introduction of VC makes Ni more susceptible to lose electrons to form the active component NiOOH,which improves the UOR performance.Furthermore,in the urea electrolytic cell,the voltage required to supply 10 mA/cm^(2)with Ni-VC/MWCNTs as the anode is reduced by nearly 100 mV compared with Ni/MWCNTs.The result suggests Ni-VC/MWCNTs is an efficient catalyst for urea electrolysis,which is expected to high-efficiency hydrogen production and resourceful utilisation of wastewater.

关 键 词：碳化钒 镍基催化剂 尿素 电催化氧化 

分 类 号：TM911.4[电气工程—电力电子与电力传动]