Photocatalytic visible water splitting is still impeded by slow kinetics of multi-electron-driven water oxidation, fast carrier recombination and insufficient light absorption of the photocatalyst. Herein, the core-shell heterojunction B_xGa_1−xAs/GaAs photocatalyst exhibited a remarkably promoted activity for hydrogen generation by direct dissociation of water molecule over boron site on catalyst surface due to redistributing electron density, as well as by promotion of visible absorption and acceleration of charge separation and transfer via a built-in electric field. B_0.25Ga_0.75As/GaAs photocatalyst exhibited hydrogen evolution rate of 8.4 μmol during 8 h from pure water without electron donor and applied bias.

光催化可见水分解仍然受到多电子驱动水氧化的缓慢动力学、快速的载流子复合和光催化剂的光吸收不足的阻碍。在此，核壳异质结 B _x Ga _1-x As/GaAs 光催化剂由于电子密度的重新分布以及可见光的促进，通过水分子在催化剂表面硼位点上的直接离解表现出显着促进的产氢活性。通过内置电场吸收和加速电荷分离和转移。B _0.25 Ga _0.75 As/GaAs 光催化剂在没有电子给体和施加偏压的情况下从纯水中在 8 小时内的析氢速率为 8.4 μmol。