Magnetic field-enhanced photoelectrochemical water splitting of Co_(3)O_(4)/TiO_(2)for efficient oxygen evolution  

磁场增强Co_(3)O_(4)/TiO_(2)光电化学水分解用于高效析氧

作　　者：Ze-En Zhou Yi Lu Yi-Xuan Liu Shang Cao Ge Tian Zhi-Yi Hu Ling Shen Si-Ming Wu Jie Ying Wei Geng Xiao-Yu Yang 周泽恩;卢毅;刘艺璇;曹尚;田歌;胡执一;沈凌;吴思明;应杰;耿伟;阳晓宇(State Key Laboratory of Advanced Technology for Materials Synthesis and Processing&Shenzhen Research Institute&Laoshan Laboratory,Wuhan University of Technology,Wuhan 430070,China;National Energy Key Laboratory for New Hydrogen-Ammonia Energy Technologies,Foshan Xianhu Laboratory,Foshan 528200,China;Nanostructure Research Centre(NRC),Wuhan University of Technology,Wuhan 430070,China;School of Chemical Engineering and Technology,Sun Yat-sen University,Zhuhai 519082,China)

机构地区：[1]State Key Laboratory of Advanced Technology for Materials Synthesis and Processing&Shenzhen Research Institute&Laoshan Laboratory,Wuhan University of Technology,Wuhan 430070,China [2]National Energy Key Laboratory for New Hydrogen-Ammonia Energy Technologies,Foshan Xianhu Laboratory,Foshan 528200,China [3]Nanostructure Research Centre(NRC),Wuhan University of Technology,Wuhan 430070,China [4]School of Chemical Engineering and Technology,Sun Yat-sen University,Zhuhai 519082,China

出　　处：《Science China Materials》2024年第10期3168-3175,共8页中国科学（材料科学）（英文版）

基　　金：supported by the National Key Research and Development Program of China(2022YFB3805600,2022YFB3805604);National Natural Science Foundation of China(52103285,22293020);Major Program(JD)of Hubei Province(2023BAA003);Natural Science Foundation of Hubei Province(2023AFB605);Dawning Program of Wuhan(2023020201020306);China Postdoctoral Science Foundation(2023M732722);National 111 Project(B20002);Jilin Province Science and Technology Development Plan(20220101248JC);Fundamental Research Funds for the Central Universities(WUT:2024IVA089).

摘　　要：Effective separation of photogenerated carriers plays a vital role in governing the efficiency of photo-electrocatalytic reactions.However,the advancement in enhancing the intrinsic carrier separation efficiency of semiconductors has shown limited progress.Herein,we reported the use of a magnetic field to improve the photoelectrochemical water splitting of a magnetic Co_(3)O_(4)/TiO_(2)photoanode by boosting the photogenerated carrier separation efficiency.In the presence of the magnetic field,oxygen evolution reaction occurs with a high photocurrent density of 0.86 mA cm^(−2)at 1.23 V versus VRHE,and an applied bias photon-to-current efficiency of 0.342%at 0.61 VRHE.Moreover,the photoanode maintains its oxygen evolution reaction for more than 400 h with photocurrent decays by ca.10%.Observations made in this effort show that the enhancement of photo-electrocatalytic efficiency by a magnetic field is a consequence of the effect of the Lorentz force generated by the magnetic field on photogenerated carriers and ions near the Co_(3)O_(4)/TiO_(2)photoanode,which improves the carrier separation efficiency and the bubble release rate.The results suggest that manipulating photoelectrode carriers by using a magnetic field is a promising strategy to design high-performance photoelectrochemical for water splitting.高效的光生载流子分离对光电催化反应效率起着至关重要的作用.然而,提高半导体本征载流子分离效率的相关研究进展有限.本文报道了通过磁场促进载流子分离来改善磁性Co_(3)O_(4)/TiO_(2)光阳极的光电催化水分解.在磁场存在下,1.23 VRHE(相对于标准氢电极)处光电流密度达到0.86 mA cm^(−2),0.61 VRHE时外加偏压光电转化效率为0.342%.此外,在光阳极上进行的析氧反应在400小时内光电流衰减仅10%.光电催化效率的提高是因为光生载流子和靠近Co_(3)O_(4)/TiO_(2)光阳极的离子受到磁场产生的洛伦兹力作用,提高了载流子分离效率和气泡释放速率.研究结果表明,通过磁场调控光电极载流子是设计高性能光电催化水分解的一种具有前景的策略.

关 键 词：photoelectrochemical water splitting Co_(3)O_(4)/TiO_(2) carrier separation efficiency stability 

分 类 号：TQ116.2[化学工程—无机化工] O643.36[理学—物理化学]