Bioinspired hierarchical nanostructured CuBi_(2)O_(4)/CuO heterojunction photocathode for enhanced performance in photoelectrochemical water splittingOA
The development of high-performance photocathode materials is crucial for solar hydrogen production,but their efficiency is often limited by poor charge separation,inefficient interfacial transfer,and sluggish surface reactions.In this work,a coral-like hierarchical nanostructured CuBi_(2)O_(4)/CuO heterojunction photocathode was designed to simultaneously overcome these limitations by synergistically adjusting the morphology and bandgap alignment.The optimized photocathode,featuring finer nanoscale microtentacles,substantially enhances the number of reactive sites,resulting in a significantly enhanced interfacial electric field,which is 1.4 times greater than that of pure CuBi_(2)O_(4).The CuBi_(2)O_(4)/CuO heterojunction photocathode generates a photocurrent density of 2.88 mA cm^(-2) at 0.6 V versus RHE,which is 4.43 times higher than that of pure CuBi_(2)O_(4)photocathode,and the incident photocurrent efficiency reaches 18%at 400 nm.The charge transfer mechanism was elucidated using synchronous illumination X-ray photoelectron spectroscopy(SI-XPS),in-situ Kelvin probe force microscopy(SI-KPFM)and density functional theory(DFT)calculations,which directly observed the transfer of photogenerated electrons from CuBi_(2)O_(4)to CuO and confirmed the enhancement of the interfacial electric field intensity induced by the S-scheme heterojunction.This work integrates bionic strategies into PEC applications,offering a valuable reference for the structural design of photoelectrodes and potentially advancing the efficiency of photoelectrochemical systems.
Hao Xiu;Fan Fan;Pan An;Mengshen Zhang;Yuting Wang;Yongpeng Cui;Yajun Wang;Guiyuan Jiang;Chunming Xu
State Key Laboratory of Heavy Oil Processing,China University of Petroleum,Beijing,102249,ChinaState Key Laboratory of Heavy Oil Processing,China University of Petroleum,Beijing,102249,ChinaState Key Laboratory of Heavy Oil Processing,China University of Petroleum,Beijing,102249,ChinaState Key Laboratory of Heavy Oil Processing,China University of Petroleum,Beijing,102249,ChinaState Key Laboratory of Heavy Oil Processing,China University of Petroleum,Beijing,102249,ChinaState Key Laboratory of Heavy Oil Processing,China University of Petroleum,Beijing,102249,ChinaState Key Laboratory of Heavy Oil Processing,China University of Petroleum,Beijing,102249,ChinaState Key Laboratory of Heavy Oil Processing,China University of Petroleum,Beijing,102249,ChinaState Key Laboratory of Heavy Oil Processing,China University of Petroleum,Beijing,102249,China
化学化工
PhotoelectrochemicalHydrogen productionHierarchical nanostructureCuBi_(2)O_(4)photocathodeInterfacial electric field
《Green Energy & Environment》 2026 (4)
P.1146-1157,12
supported by the National Natural Science Foundation of China(52270115,52236003,22109178)National Key Research and Development Program of China(No.2021YFB4000405)Science Foundation of China University of Petroleum Beijing(No.2462023YJRC032,2462023YJRC022).
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