An ideal way to have the best of both worlds for environmental protection and energy conservation should be to juggle photocatalytic degrading pollutants and producing hydrogen from the pollutant solution synchronously. Herein, we have designed and synthesized a new 3D flower-like p-n-p heterostructure β-Ni(OH)₂/NiS/TiO₂ as a photocatalytic device, which is ideally suited for both removal of anionic dye methyl orange (MO), and release of hydrogen from the MO solution driven by photoelectric conversion without the need for using noble metals. The formation structure with optimal molar ratio 0.01-β-Ni(OH)₂/0.001-NiS/TiO₂ shows superior photocatalytic activity for removal of anionic dye MO and releasing hydrogen, its removal efficiency can reach as high as 98% in 15 min and the production of hydrogen is about 7.2 μmolh⁻¹ from the MO solution. Results and analyses show that the outstanding performances of the sample should be attributed to the synergistic effects on two aspects. One is the high efficient charge separation and transfer driven by the internal electric field at the interfaces of NiS/TiO₂ and the exposed high energy {001} facets of TiO₂. The other is the modifier β-Ni(OH)₂ as an assistant sacrificial agent can play an important role of the holes transfer for charge carriers transport balance in the oxidation-reduction process, and the generated active species NiOOH also has a beneficial effect on degrading MO and releasing hydrogen.

兼顾环境保护和节能两全其美的理想方法应该是兼顾光催化降解污染物并同时从污染物溶液中产生氢气。本文中，我们设计并合成了一种新型3D花状p- n -p异质结构β- Ni（OH）₂ / NiS / TiO ₂作为光催化装置，非常适合同时去除阴离子染料甲基橙（MO ），并通过光电转换从MO溶液中释放出氢气，而无需使用贵金属。最佳摩尔比0.01- β- Ni（OH）₂ /0.001-NiS/TiO ₂的形成结构在去除阴离子染料MO和释放氢方面表现出优异的光催化活性，在15分钟内去除率可以达到98％，并且从MO溶液产生的氢约为7.2μmolh ^-1。结果和分析表明，样品的优异性能应归因于两个方面的协同效应。一个是由内部电场在NIS / TiO 2的接口驱动的高效电荷分离和传输₂和暴露的高能{001}的TiO面₂。另一个是改性剂β- Ni（OH）₂ 作为辅助牺牲剂，在氧化还原过程中，可以起到空穴转移对电荷载流子输运平衡的重要作用，所产生的活性物种NiOOH对MO的降解和氢的释放也具有有益的作用。