Xu You, Yu Shanshan, Ren Tianlun, Liu Songliang, Wang Ziqiang, Li Xiaonian, Wang Liang, Wang Hongjing
State Key Laboratory Breeding Base of Green-Chemical Synthesis Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, P. R. China.
ACS Appl Mater Interfaces. 2020 Aug 5;12(31):34728-34735. doi: 10.1021/acsami.0c03333. Epub 2020 Jul 23.
Electrocatalytic reduction of water via hydrogen evolution reaction (HER) is considered one of the most ideal avenues to produce high-purity hydrogen (H) in large quantities, which always requires active electrocatalysts to overcome the high energy barrier. It is of significance yet challenging to design and construct effective HER electrocatalysts of an acceptable cost. In this study, a highly efficient metal-organic framework (MOF)-based electrochemical HER system based on NiRu-based binary MOF (Ru-doped Ni(BDC)TED MOF, BDC = 1,4-benzenedicarboxylic acid; TED = triethylenediamine) nanosheets grown on conductive substrates (e.g., Ni foam, carbon cloth) is fabricated by a facile solvothermal method. The resultant NiRu-MOF-based composites possess enhanced electron transport ability and water stability, accompanied by increased electrochemically active areas and hydrophilic/aerophobic properties. With these advantages, the optimized NiRu-MOF nanosheet arrays on Ni foam substrate (NiRu-MOF/NF) with a Ru/Ni molar ratio of 6/94 in the MOF structure could exhibit efficient catalytic performance for HER in alkaline conditions, requiring a small overpotential of 51 mV at -10 mA cm. This study could provide a feasible way for the design and synthesis of two-dimensional (2D) MOF-based materials with controllable interface properties for energy catalysis and beyond.
通过析氢反应（HER）进行水的电催化还原被认为是大量生产高纯度氢气（H）的最理想途径之一，这始终需要活性电催化剂来克服高能量势垒。设计和构建成本可接受的高效HER电催化剂具有重要意义，但也具有挑战性。在本研究中，通过简便的溶剂热法制备了一种基于镍钌二元金属有机框架（MOF）（Ru掺杂的Ni(BDC)TED MOF，BDC = 1,4-苯二甲酸；TED = 三亚乙基二胺）纳米片且生长在导电基底（如泡沫镍、碳布）上的高效基于MOF的电化学HER体系。所得的基于NiRu-MOF的复合材料具有增强的电子传输能力和水稳定性，同时电化学活性面积增加，且具有亲水性/憎气性。凭借这些优势，MOF结构中Ru/Ni摩尔比为6/94的泡沫镍基底上的优化NiRu-MOF纳米片阵列（NiRu-MOF/NF）在碱性条件下对HER可表现出高效的催化性能，在-10 mA cm时所需的过电位仅为51 mV。本研究可为设计和合成具有可控界面性质的二维（2D）基于MOF的材料用于能量催化及其他领域提供一条可行的途径。
