Integrating photocatalytic reduction of CO2 with selective oxidation of tetrahydroisoquinoline over InP-In2O3 Z-scheme p-n junction

• 来源期刊: 中国科学:化学（英文版）
• 年，卷（期）: 2020,（1）
• 页码范围: 28-34
• 页数: 7页
• 语种: 英文

摘要

The development of a facile strategy to construct stable hierarchal porous heterogeneous photocatalysts remains a great challenge for efficient CO2 reduction.Additionally,hole-trapping sacrificial agents (e.g.,triethanolamine,triethylamine,and methanol) are mostly necessary,which produce useless chemicals,and thus cause costs/environmental concerns.Therefore,utilizing oxidation ability of holes to develop an alternative photooxidation reaction to produce value-added chemicals,especially coupled with CO2 photoreduction,is highly desirable.Here,an in situ partial phosphating method of In2O3 is reported for synthesizing InP-In2O3 p-n junction.A highly selective photooxidation of tetrahydroisoquinoline (THIQ) into value-added dihydroisoquinoline (DHIQ) is to replace the hole driven oxidation of typical sacrificial agents.Meanwhile,the photoelectrons of InP-In2O3 p-n junction can induce the efficient photoreduction of CO2 to CO with high selectivity and stability.The evolution rates of DHIQ and CO are 2 and 3.8 times higher than those of the corresponding In2O3 n-type precursor,respectively.In situ irradiated X-ray photoelectron spectroscopy and electron spin resonance are utilized to confirm that the direct Z-scheme mechanism of InP-In2O3 p-n junction accelerate the efficient separation of photocarriers.