A precious metal-free solar water splitting cell with a bifunctional cobalt phosphide electrocatalyst and doubly promoted bismuth vanadate photoanode†,Journal of Materials Chemistry A

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A precious metal-free solar water splitting cell with a bifunctional cobalt phosphide electrocatalyst and doubly promoted bismuth vanadate photoanode†
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2017-12-13 00:00:00 , DOI: 10.1039/c7ta09134f
Jin Hyun Kim _{1,

2,

3,

4,

5} , Suenghoon Han _{1,

2,

3,

4,

5} , Yim Hyun Jo _{6,

7,

8,

9} , Yunji Bak _{5,

10,

11,

12} , Jae Sung Lee _{5,

10,

11,

12}

Affiliation

A bifunctional cobalt phosphide (CoP) electrocatalyst is applied to a doubly promoted BiVO₄ photoanode as an oxygen evolution as well as to a cathode as a hydrogen evolution reaction (HER) catalyst to establish a photoelectrochemical (PEC) water splitting cell made of only earth abundant elements without any precious metals. Although the intrinsic HER activity of CoP is lower than Pt/C, CoP can replace Pt as the cathode of PEC water splitting cells without any significant loss in performance. During the water splitting reaction, the cathode remains as CoP, but CoP loaded on the BiVO₄ photoanode turns into amorphous CoO_x–HPO_y with its chemical state and performance very similar to those of well-known cobalt phosphate electrocatalysts. A tandem cell composed of CoP/hydrogen-treated, 1% Mo-doped BiVO₄ as the photoanode, a CoP/Ni foam as the cathode and a 2-piece, series connected crystalline Si solar cell as the bias power generator demonstrates stable unassisted water splitting with a solar-to-hydrogen conversion efficiency of 5.3% under simulated solar light, which represents the highest among reported precious metal-free unassisted solar water splitting devices.

中文翻译：

不含贵金属的太阳能分水槽，具有双功能磷化钴电催化剂和双倍促进型钒酸铋光阳极†

将双功能磷化钴（CoP）电催化剂应用于双促进的BiVO _4光阳极，以作为氧的释放，并应用于阴极，作为氢释放反应（HER）的催化剂，以建立仅由土壤制成的光电化学（PEC）分水槽元素丰富，不含任何贵金属。尽管CoP的固有HER活性低于Pt / C，但CoP可以代替Pt作为PEC分水池的阴极，而不会显着降低性能。在水分解反应中，阴极保留为CoP，但负载在BiVO ₄光电阳极上的CoP变成非晶CoO _x –HPO _y其化学状态和性能与众所周知的磷酸钴电催化剂非常相似。串联电池由CoP /氢处理，1％Mo掺杂的BiVO ₄作为光阳极，CoP / Ni泡沫作为阴极以及2件串联晶体硅太阳能电池作为偏置发电机组成，显示出稳定的无辅助在模拟太阳光下进行水分解，太阳能到氢的转换效率为5.3％，在报道的无贵金属无辅助太阳能分水装置中是最高的。

更新日期：2017-12-13

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