Huang Dingwang, Li Lintao, Wang Kang, Li Yan, Feng Kuang, Jiang Feng
Institute of Semiconductor Science and Technology, South China Normal University, Guangzhou, P. R. China.
SCNU Qingyuan Institute of Science and Technology Innovation Co., Ltd., Qingyuan, China.
Nat Commun. 2021 Jun 18;12(1):3795. doi: 10.1038/s41467-021-24060-5.
A highly efficient, low-cost and environmentally friendly photocathode with long-term stability is the goal of practical solar hydrogen evolution applications. Here, we found that the CuBiS film-based photocathode meets the abovementioned requirements. The CuBiS-based photocathode presents a remarkable onset potential over 0.9 V with excellent photoelectrochemical current densities (~7 mA/cm under 0 V) and appreciable 10-hour long-term stability in neutral water solutions. This high onset potential of the CuBiS-based photocathode directly results in a good unbiased operating photocurrent of ~1.6 mA/cm assisted by the BiVO photoanode. A tandem device of CuBiS-BiVO with an unbiased solar-to-hydrogen conversion efficiency of 2.04% is presented. This tandem device also presents high stability over 20 hours. Ultimately, a 5 × 5 cm large CuBiS-BiVO tandem device module is fabricated for standalone overall solar water splitting with a long-term stability of 60 hours.
拥有长期稳定性的高效、低成本且环保的光阴极是实际太阳能制氢应用的目标。在此，我们发现基于CuBiS薄膜的光阴极满足上述要求。基于CuBiS的光阴极在0.9 V以上呈现出显著的起始电位，具有优异的光电化学电流密度（在0 V下约为7 mA/cm²），并且在中性水溶液中具有可观的10小时长期稳定性。基于CuBiS的光阴极的这种高起始电位直接导致在BiVO光阳极的辅助下产生约1.6 mA/cm²的良好无偏压工作光电流。展示了一种CuBiS - BiVO串联器件，其无偏压太阳能到氢能的转换效率为2.04%。该串联器件在20小时以上也呈现出高稳定性。最终，制造了一个5×5 cm的大型CuBiS - BiVO串联器件模块，用于独立的全太阳能水分解，具有60小时的长期稳定性。
