Novel hetero-bimetallic coordination polymer as a single source of highly dispersed Cu/Ni nanoparticles for efficient photocatalytic water splitting†,Inorganic Chemistry Frontiers

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Novel hetero-bimetallic coordination polymer as a single source of highly dispersed Cu/Ni nanoparticles for efficient photocatalytic water splitting†
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2018-06-04 00:00:00 , DOI: 10.1039/c8qi00355f
Shaista Ibrahim _{1,

2,

3,

4,

5} , Imran Majeed _{1,

2,

3,

4,

5} , Yuhong Qian _{6,

7,

8} , Azhar Iqbal _{1,

2,

3,

4,

5} , Dan Zhao _{6,

7,

8} , David R. Turner _{9,

10,

11,

12} , Muhammad Arif Nadeem _{1,

2,

3,

4,

5}

Affiliation

A new strategy for depositing highly dispersed Cu and Ni nanoparticles on the surface of TiO₂ from a single source is demonstrated for photocatalytic hydrogen production. We used a newly synthesized cyanide-bridged hetero-bimetallic coordination polymer [{Cu^II(4,4′-dipy)₂}{Ni(CN)₄}]_n·0.7(C₂H₆O₂).1.6(H₂O) (CP-1) (4,4′-dipy = 1,3-di(4-pyridyl)propane) as a single-source precursor of Cu–Ni nanoparticles. The structure of CP-1 was established by single-crystal X-ray diffraction analysis; CP-1 crystallizes in the monoclinic space group C2/c with β = 111.67(3)°. CP-1/TiO₂ composites containing different weight percentages of CP-1 were achieved by hydrolyzing titanium isopropoxide in the presence of CP-1. Highly dispersed Cu and Ni nanoparticles were deposited on TiO₂ by the calcination of the CP-1/TiO₂ composites at different temperatures (420 °C, 470 °C and 520 °C) in air followed by reduction in H₂/Ar atmosphere at 470 °C for 2 h. XRD, DRS/UV–Vis, TEM, Cu/Ni 2p XPS, and photoluminescence spectroscopy demonstrated the presence of CuO/Cu⁰ and NiO/Ni⁰ as active co-catalysts on the surface of TiO₂. The 1 wt% Cu–Ni/TiO₂-470 photocatalyst showed the maximum H₂ production activity of 8.5 mmol h⁻¹ g⁻¹ in a glycerol/water mixture (20 vol%). The results are anticipated to direct the future development of efficient, low-cost and noble metal-free semiconductor photocatalysts for solar H₂ production.

中文翻译：

新型异质双金属配位聚合物可作为单一来源的高度分散的Cu / Ni纳米粒子，可实现有效的光催化水分解†

展示了一种从单一来源在TiO ₂表面上沉积高度分散的Cu和Ni纳米颗粒的新策略，用于光催化制氢。我们使用了新合成的氰化物桥联的异双金属配位聚合物[{Cu ^II（4,4'-dipy）₂ } {Ni（CN）₄ }] _n ·0.7（C ₂ H ₆ O ₂）.1.6（H ₂ O）（CP-1）（4,4'-dipy = 1,3-di（4-吡啶基）丙烷）作为Cu-Ni纳米粒子的单源前体。CP-1的结构通过单晶X射线衍射分析确定。CP-1结晶单斜空间群C ^ 2 / C ^与β = 111.67（3）°。通过在CP-1存在下水解异丙氧基钛，可以得到含有不同重量百分比CP-1的CP-1 / TiO ₂复合材料。通过在不同温度（420°C，470°C和520°C）下在空气中煅烧CP-1 / TiO ₂复合材料，然后在H ₂ / Ar气氛中还原，将高度分散的Cu和Ni纳米颗粒沉积在TiO ₂上在470°C下放置2小时。XRD，DRS / UV-Vis，TEM，Cu / Ni 2p XPS和光致发光光谱表明存在CuO / CuTiO₂表面上的活性助催化剂包括⁰和NiO / Ni⁰。1％（重量）的Cu-Ni / TiO₂ -470光催化剂在甘油/水混合物（20％（体积））中显示出最大的H₂产生活性，为8.5 mmol h^-1 g^-1。预期结果将指导用于太阳能H₂生产的高效，低成本和无贵金属半导体光催化剂的未来发展。

更新日期：2018-06-04

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