Abstract：
Constructing a reliable and robust cobalt-based catalyst for hydrogen evolution via hydrolysis of sodium borohydride is appealing but challenging due to the deactivation caused by the metal leaching and re-oxidization of metallic cobalt. A unique core-shell-structured coronavirus-like Co@C microsphere was prepared via pyrolysis of Co-MOF. This special Co@C had a microporous carbon coating to retain the reduced state of cobalt and resist the metal leaching. Furthermore, several nano-bumps grown discretely on the surface afforded enriched active centers. Applied in the pyrolysis of NaBH4, the Co@C-650, carbonized at 650 °C, exhibited the best activity and reliable recyclability. This comparable performance is ascribed to the increased metallic active sites and robust stability.
摘要：
构建用于通过硼氢化钠的水解析氢的可靠且稳健的钴基催化剂是有吸引力的,但由于由金属浸出和金属钴的再氧化引起的失活而具有挑战性。通过Co-MOF的热解制备了独特的核壳结构冠状病毒样Co@C微球。这种特殊的Co@C具有微孔碳涂层以保持钴的还原状态并抵抗金属浸出。此外，在表面上离散生长的几个纳米凸块提供了富集的活性中心。应用于NaBH4的热解，Co@C-650，在650°C碳化，表现出最佳的活性和可靠的可回收性。这种可比较的性能归因于增加的金属活性位点和稳健的稳定性。
