Chen Guoqiang, Wang Peng, Wu Yaqiang, Zhang Qianqian, Wu Qian, Wang Zeyan, Zheng Zhaoke, Liu Yuanyuan, Dai Ying, Huang Baibiao
State Key Laboratory of Crystal Materials, Shandong University, Shanda South Road 27#, Jinan, 250100, China.
School of Physics, Shandong University, Shanda South Road 27#, Jinan, 250100, China.
Adv Mater. 2020 Oct;32(39):e2001344. doi: 10.1002/adma.202001344. Epub 2020 Aug 25.
Lead-free perovskites Cs Bi Sb I (x = 0.1, 0.3, 0.5, 0.7, 0.9) are prepared by a co-precipitation method and their photocatalytic performance for hydrogen production is studied in aqueous HI solution. Compared with the lead-based perovskite (CH NH )PbI , Cs Bi Sb I has a better catalytic performance under air mass 1.5 G (AM 1.5 G) simulated sunlight (100 mW cm ), powders of Cs Bi Sb I (100 mg) loaded with Pt nanoparticles show < H evolution rate of 92.6 µmol h , which greatly exceeds that of (CH NH )PbI powders loaded with Pt nanoparticles (100 mg catalyst, 4 µmol h ). The Cs Bi Sb I has a high stability, with no apparent decrease in catalytic activity after five consecutive H evolution experiments. The doping of Sb in Cs Bi Sb I effectively reduces the contribution of Bi on the conduction band, attenuating the effect of Bi vacancy on band structure. Compared with pure Cs Bi I and Cs Sb I , Cs Bi Sb I has fewer midgap states and better optical absorption, which greatly enhances its performance for the hydrogen evolution reaction.
通过共沉淀法制备了无铅钙钛矿CsBiₓSb₁₋ₓI₃（x = 0.1、0.3、0.5、0.7、0.9），并研究了它们在HI水溶液中制氢的光催化性能。与铅基钙钛矿（CH₃NH₃）PbI₃相比，CsBiₓSb₁₋ₓI₃在空气质量1.5G（AM 1.5G）模拟太阳光（100 mW/cm²）下具有更好的催化性能，负载Pt纳米颗粒的CsBiₓSb₁₋ₓI₃（100 mg）粉末显示出92.6 μmol/h的析氢速率，大大超过了负载Pt纳米颗粒的（CH₃NH₃）PbI₃粉末（100 mg催化剂，4 μmol/h）。CsBiₓSb₁₋ₓI₃具有高稳定性，在连续五次析氢实验后催化活性没有明显下降。Sb掺杂到CsBiₓSb₁₋ₓI₃中有效地降低了Bi对导带的贡献，减弱了Bi空位对能带结构的影响。与纯CsBiI₃和CsSbI₃相比，CsBiₓSb₁₋ₓI₃具有更少的带隙中间态和更好的光吸收，这大大提高了其析氢反应性能。
