Chestnut-like copper cobalt phosphide catalyst for all-pH hydrogen evolution reaction and alkaline water electrolysis†,Journal of Materials Chemistry A

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Chestnut-like copper cobalt phosphide catalyst for all-pH hydrogen evolution reaction and alkaline water electrolysis†
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2019-05-16 00:00:00 , DOI: 10.1039/c9ta03686e
Liang Yan _{1,

2,

3,

4,

5} , Bing Zhang _{1,

2,

3,

4,

5} , Junlu Zhu _{1,

2,

3,

4,

5} , Shanzhi Zhao _{1,

2,

3,

4,

5} , Yunyong Li _{1,

2,

3,

4,

5} , Bao Zhang _{6,

7,

8,

9} , Jianjun Jiang _{6,

7,

8,

9} , Xiao Ji _{6,

7,

8,

9} , Haiyan Zhang _{1,

2,

3,

4,

5} , Pei Kang Shen _{9,

10,

11,

12}

Affiliation

A novel type of chestnut-like copper cobalt phosphide (Cu_xCo_1−xP) nanoarray on carbon fiber paper (CP) for the splitting of water was synthesized through a simple hydrothermal reaction followed by in situ phosphorization treatment. As a hydrogen evolution reaction (HER) catalyst, Cu_xCo_1−xP/CP showed high HER activity at all pH values. To drive a current density of 10 mA cm⁻², the optimized Cu_0.075Co_0.925P/CP required an overpotential of 47, 120, and 70 mV in acidic, neutral, and alkaline media, respectively. In addition, Cu_0.075Co_0.925P/CP exhibited excellent activity for the oxygen evolution reaction (OER) with a small overpotential of 221 mV to reach 10 mA cm⁻². Furthermore, when Cu_0.075Co_0.925P/CP was used as both the cathode and anode for overall water splitting in 1.0 M KOH, the two-electrode electrolyzer only needed a cell voltage of 1.55 V to achieve 10 mA cm⁻², which is superior to that of the noble metal-based Pt/C‖IrO₂ cell and most previously reported electrocatalysts. Moreover, this electrolyzer could be powered by a single AA battery with a voltage of 1.5 V. Density functional theory (DFT) calculations further proved that the good catalytic activity of Cu_xCo_1−xP/CP resulted from its smaller hydrogen adsorption free energy (ΔG_H*) and overpotential. This work provides a promising strategy to design high-performance and low-cost electrocatalysts for overall water splitting and other energy-related applications.

中文翻译：

板栗状磷化铜钴催化剂，用于全pH值氢气分解反应和碱性水电解†

通过简单的水热反应，然后进行原位磷化处理，在碳纤维纸（CP）上合成了一种新型的栗状磷化铜钴（Cu _x Co _{1- x} P）纳米阵列。作为放氢反应（HER）催化剂，Cu _x Co _1-_x P / CP在所有pH值下均显示出较高的HER活性。为了驱动10 mA cm ^-2的电流密度，优化的Cu _0.075 Co _0.925 P / CP在酸性，中性和碱性介质中分别需要47、120和70 mV的过电势。另外，Cu _0.075 Co _0.925P / CP对氧释放反应（OER）表现出出色的活性，其小电势为221 mV，达到10 mA cm ^-2。此外，当在1.0 M KOH中将Cu _0.075 Co _0.925 P / CP用作总水分解的阴极和阳极时，双电极电解槽仅需要1.55 V的电池电压即可达到10 mA cm ^-2，这是优于基于贵金属的Pt / C'IrO ₂电池和大多数以前报道的电催化剂。此外，该电解槽可以由单个AA电池供电，电压为1.5V。密度泛函理论（DFT）计算进一步证明，Cu _x Co _1-_x具有良好的催化活性。P / CP是由于其较小的氢吸附自由能（ΔG _{H *}）和超电势所致。这项工作为设计用于整体水分解和其他能源相关应用的高性能和低成本电催化剂提供了一种有前途的策略。

更新日期：2019-05-16

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