摘要：To improve separation efficiency of the photogenerated electron-hole pairs,constructing a heterojunction is considered to be a promising ***,the fabrication of heterojunction via a facile route to achieve a substantial improvement in photocatalytic performance is still *** this work,a well-designed nanosheet-based rodlike step-scheme(S-scheme)heterojunction Bi_(4)O_(5)I_(2)/Bi_(4)O_(5)Br_(2) with rich oxygen vacancies(OVs)(Bi_(4)O_(5)I_(2)/Bi_(4)O_(5)Br_(2)-OV)was easily synthesized by calcining BiOAc0.6Br0.2I0.2(Ac-=CH3 COO-)*** as-prepared Bi4O5I2/Bi4O5Br2-OV exhibited excellent visible light photocatalytic performance towards antibiotic tetracycline(TC)and dye rhodamine B(Rh B)degradation and removal rate reached 90.2% and 97.0%within 120 min,respectively,which was higher than those of Bi4O5I2-OV(56.8% and 71.8%),Bi4O5Br2-OV(47.4%and 68.4%),solid solution BiOAc0.6Br0.2I0.2(67.0% and 84.0%)and Bi_(4)O_(5)I_(2)/Bi_(4)O_(5)Br_(2) with poor oxygen vacancies(Bi4O5I2/Bi4O5Br2-P)(30.6%and 40.4%).Owing to the release of heat and generation of reducing carbon during calcining the precursor with Ac-,it could not only reduce the generation temperature of Bi-rich bismuth oxyhalides,which thus decreased particle size and increased surface areas,but also introduce surface OVs,which could trap photoelectrons and inhibit the recombination of *** addition,the calcination of single solid solution precursor benefited to the formation of well-alloyed interfaces with larger contact areas between 2D/2D nanosheet-like materials,which facilitates charge carriers transfer at the *** Bi4O5I2/Bi4O5Br2-OV also shows the desirable removal rate for TC and Rh B in actual wastewater or in the presence of some *** study provides an effective and simple strategy for designing OVs modified Bi-rich oxyhalides heterojunctions.

摘要：酸性质子交换膜电解水(PEMWE)是一种电流密度高、动态响应快、产氢纯度高的电解水工艺,为实现其高效工业级应用,开发廉价、高效、稳定的析氧催化剂尤为关键。本文通过两步合成法将稀土元素钇(Y)掺杂到无定形的碳载体中修饰其表面的二氧化铱(IrO_(2))颗粒。制备得到的IrO_(2)/Y_(x)C具有优异的酸性析氧反应催化活性,在10mA/cm^(2)的电流密度下所需过电位仅为270mV,低于未掺杂Y的IrO_(2)/C(300mV)以及商用IrO_(2)(310mV)。Y的掺杂强化了碳载体与其表面二氧化铱颗粒之间的金属-载体相互作用,导致了Ir活性位点周围电子密度的变化,有利于调节反应中间体的吸附,优化反应速率。这一研究成果为PEMWE中析氧过程提供了新的催化剂设计思路,有望推动PEMWE技术在清洁能源领域更广泛的应用。