Assembled 3D MOF on 2D Nanosheets for Self-boosting Catalytic Synthesis of N-doped Carbon Nanotube Encapsulated Metallic Co Electrocatalysts for Overall Water Splitting
Assembled 3D MOF on 2D Nanosheets for Self-boosting Catalytic Synthesis of N-doped Carbon Nanotube Encapsulated Metallic Co Electrocatalysts for Overall Water Splitting
复制标题
2D 纳米片上组装 3D MOF 用于自增强催化合成 N 掺杂碳纳米管封装金属钴电催化剂用于整体水分解
DOI：
10.1016/j.apcatb.2020.118939
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发表时间：
2020-08
期刊：
影响因子：
--
通讯作者：
Lei Zhang
中科院分区：
文献类型：
--
作者：
Lijun Yang;Hui Li;Yang Yu;Yang Wu;Lei Zhang
通过电沉积、立体组装和自增强催化裂解制备了金属Co嵌入N掺杂碳纳米管阵列（Co@N-CNT）的无粘结剂电极。具体而言，定向电沉积垂直生长的Co（OH）2-纳米片作为结构诱导剂，提供丰富的网站ZIF-67的生长，和三聚氰胺被选为引发剂的定向生长的N-CNTs。作为一种用于水裂解的一体化非贵金属电催化剂，它仅需1.58 V即可在碱电解槽中实现30 mA cm− 2。其优异的电化学性能主要归功于其独特的三维分层管状结构和各化学成分的协同作用，提供了大量可及的活性位点，加速了电子/电解质的扩散，提高了导电性、亲水性和结构稳定性。利用密度泛函理论对电催化分解水的机理进行了进一步的探讨。这种通用的方法可以广泛地应用于制造良好定义的单金属或双金属封装到N-CNTs中用于各种电化学应用。
A binder-free electrode with metallic Co embedded in N-doped carbon nanotube array (Co@N-CNT) was fabricated via an electrodeposition, stereoscopic assembly and self-boosting catalytic pyrolysis. Specifically, directed-eletrodeposition vertical growth of Co(OH)2-nanosheet serves as the structure inducer to offer abundant sites for ZIF-67 growth, and melamine is selected as an initiator for orientated growth of N-CNTs. As an integrative non-noble electrocatalyst for water splitting, it requires only 1.58 V to achieve 30 mA cm−2in an alkali-electrolyzer. The remarkable electrochemical performance is mainly attributed to the unique 3D hierarchical tubular structure and the synergistic effect of each chemical compositions, which provide amount of accessible active sites, accelerate the diffusion of electron/electrolyte, and improve the electrical conductivity, hydrophilicity and structural stability. The electro-catalytic splitting water mechanism was further explored by density functional theory. This universal method can be extensively applied to fabricate well-defined monometal or bimetal encapsulated into N-CNTs for various electrochemical applications.
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