随着全球能源需求的迅猛增长,氢能作为一种清洁、高效的能源,其重要性日益凸显。电解水作为制备氢气的理想方法,其效率的提升关键在于优化两个核心反应:析氧反应(OER)和析氢反应(HER)。然而,OER由于其复杂的四电子转移过程和缓慢的动力...随着全球能源需求的迅猛增长,氢能作为一种清洁、高效的能源,其重要性日益凸显。电解水作为制备氢气的理想方法,其效率的提升关键在于优化两个核心反应:析氧反应(OER)和析氢反应(HER)。然而,OER由于其复杂的四电子转移过程和缓慢的动力学特性,成为了限制电解水技术效率提升的关键瓶颈。为了深入研究OER的反应机制,本文借助沸石咪唑酯骨架(ZIF)材料的独特优势,将钴卟啉负载在ZIF材料上,制备了一系列以ZIF材料为基底的OER催化剂。电化学测试表明,钴卟啉@Ni/Co-ZIF复合材料在碱性条件下具有较好的析氧性能,在10 mA cm−2电流密度下的过电位为345 mV,Tafel斜率为95 mV dec−1,且拥有良好的稳定性。With the rapid growth of global energy demand, hydrogen energy as a clean and efficient energy carrier, its importance has become increasingly prominent. Water splitting is an ideal method for hydrogen production, and the key to improve its efficiency is to optimize two core reactions: Oxygen evolution (OER) and hydrogen evolution (HER). However, due to its complex four-electron transfer process and slow kinetic characteristics, OER has become a key bottleneck limiting the efficiency of electrolytic water technology. In order to further study the reaction mechanism of OER, a series of OER catalysts based on zeolite imidazolate framework (ZIF) were prepared by loading cobalt porphyrin on ZIF material with the advantage of ZIF. Electrochemical tests show that cobalt porphyrin@Ni/Co-ZIF material has good oxygen evolution performance with overpotential of 345 mV at 10mA cm−2 current density and Tafel slope of 95 mV dec−1, and good stability under alkaline conditions.展开更多
采用溶剂热方法合成了沸石咪唑酯骨架结构材料Co-ZIF-9,并将其用于非均相催化氨硼烷水解放氢实验.结果表明:配位的Co-ZIF-9在室温下能够有效地催化氨硼烷放出氢气,且其催化活性远高于Co纳米粒子,Co-ZIF-9的多孔结构在催化中起了很大的作...采用溶剂热方法合成了沸石咪唑酯骨架结构材料Co-ZIF-9,并将其用于非均相催化氨硼烷水解放氢实验.结果表明:配位的Co-ZIF-9在室温下能够有效地催化氨硼烷放出氢气,且其催化活性远高于Co纳米粒子,Co-ZIF-9的多孔结构在催化中起了很大的作用.另外,Co-ZIF-9催化水解氨硼烷的活化能约为40.8 k J mol-1,低于多数用于该催化实验的其他催化剂,表明所合成的沸石咪唑酯骨架结构材料Co-ZIF-9具有优越的催化性能.展开更多
文摘随着全球能源需求的迅猛增长,氢能作为一种清洁、高效的能源,其重要性日益凸显。电解水作为制备氢气的理想方法,其效率的提升关键在于优化两个核心反应:析氧反应(OER)和析氢反应(HER)。然而,OER由于其复杂的四电子转移过程和缓慢的动力学特性,成为了限制电解水技术效率提升的关键瓶颈。为了深入研究OER的反应机制,本文借助沸石咪唑酯骨架(ZIF)材料的独特优势,将钴卟啉负载在ZIF材料上,制备了一系列以ZIF材料为基底的OER催化剂。电化学测试表明,钴卟啉@Ni/Co-ZIF复合材料在碱性条件下具有较好的析氧性能,在10 mA cm−2电流密度下的过电位为345 mV,Tafel斜率为95 mV dec−1,且拥有良好的稳定性。With the rapid growth of global energy demand, hydrogen energy as a clean and efficient energy carrier, its importance has become increasingly prominent. Water splitting is an ideal method for hydrogen production, and the key to improve its efficiency is to optimize two core reactions: Oxygen evolution (OER) and hydrogen evolution (HER). However, due to its complex four-electron transfer process and slow kinetic characteristics, OER has become a key bottleneck limiting the efficiency of electrolytic water technology. In order to further study the reaction mechanism of OER, a series of OER catalysts based on zeolite imidazolate framework (ZIF) were prepared by loading cobalt porphyrin on ZIF material with the advantage of ZIF. Electrochemical tests show that cobalt porphyrin@Ni/Co-ZIF material has good oxygen evolution performance with overpotential of 345 mV at 10mA cm−2 current density and Tafel slope of 95 mV dec−1, and good stability under alkaline conditions.
文摘采用溶剂热方法合成了沸石咪唑酯骨架结构材料Co-ZIF-9,并将其用于非均相催化氨硼烷水解放氢实验.结果表明:配位的Co-ZIF-9在室温下能够有效地催化氨硼烷放出氢气,且其催化活性远高于Co纳米粒子,Co-ZIF-9的多孔结构在催化中起了很大的作用.另外,Co-ZIF-9催化水解氨硼烷的活化能约为40.8 k J mol-1,低于多数用于该催化实验的其他催化剂,表明所合成的沸石咪唑酯骨架结构材料Co-ZIF-9具有优越的催化性能.
