纳米晶态硼化钴的合成及其催化氨硼烷高效制氢

Synthesis of Nanocrystalline Cobalt Boride for Efficient Catalytic Hydrogen Production via Ammonia Borane Hydrolysis

采用简单的煅烧工艺合成了纳米硼化钴(CoB)晶体,并首次研究了纳米CoB晶体在氨硼烷溶液水解制氢过程中的催化活性。研究发现,纳米CoB晶体具有较高的催化活性,在室温条件下其转换频率(TOF)为35.3 mol_(H_(2))·molcat^(-1)·min^(-1),优于同等条件下贵金属Pt催化剂(TOF=29.3 mol_(H_(2))·molcat^(-1)·min^(-1))。此外,循环测试8次后纳米硼化物晶体的催化制氢性能没有发生衰减。进一步研究发现CoB表面的Co0物种是催化制氢的活性位点,而表面的B物种位点能够有效辅助Co0位点实现协同催化氨硼烷制氢。

In this paper,a simple calcination process was used to synthesize nanocrystalline cobalt boride(CoB),which was employed to catalyze the hydrolysis of ammonia borane solution at room temperature.Specifically,it was found that the CoB exhibited high performance with a turnover frequency(TOF)of 35.3 mol_(H_(2))·molcat^(-1)·min^(-1),which is superior to platinum(TOF=29.3 mol_(H_(2))·molcat^(-1)·min^(-1)).It still possessed excellent catalytic hydrogen production performance after repeated testing for 8 times.We found that Co0 species on the surface of CoB is a possible catalytic active site,and the boron site on the surface can effectively assist the Co0 site to achieve the synergistic catalytic hydrogen production from ammonia borane.