Self-supported Al-doped cobalt phosphide nanosheets grown on three-dimensional Ni foam for highly efficient water reduction and oxidation†,Inorganic Chemistry Frontiers

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Self-supported Al-doped cobalt phosphide nanosheets grown on three-dimensional Ni foam for highly efficient water reduction and oxidation†
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2018-10-26 00:00:00 , DOI: 10.1039/c8qi01026a
Xianwei Lv _{1,

2,

3,

4,

5} , Zhongpan Hu _{1,

2,

3,

4,

5} , Jintao Ren _{1,

2,

3,

4,

5} , Yuping Liu _{1,

2,

3,

4,

5} , Zheng Wang _{6,

7,

8,

9,

10} , Zhong-Yong Yuan _{1,

2,

3,

4,

5}

Affiliation

Developing efficient non-noble-metal electrocatalysts for overall water-splitting is still a great challenge for future renewable energy conversion and storage systems. Herein, cross-linked Al-doped CoP nanosheets on three-dimensional (3D) nickel foam (Al-CoP/NF) are synthesized by a simple low-temperature phosphidation method using a CoAl layer double hydroxide precursor and exhibit high activity and good stability towards the hydrogen evolution reaction (HER) at all pH values, with low overpotentials of 51 mV (0.5 M H₂SO₄, pH = 0), 66 mV (1.0 M KOH, pH = 14) and 83 mV (1.0 M PBS, pH = 7) to achieve a current density of 10 mA cm⁻². In addition, this self-supported electrode shows excellent activity towards the oxygen evolution reaction (OER) in alkaline media, affording an anodic current density of 10 mA cm⁻² at an overpotential of 330 mV. As a result, Al-CoP/NF as a bifunctional electrocatalyst can afford a current density of 10 mA cm⁻² at a cell voltage of 1.63 V over a long-term overall water splitting operation in 1.0 M KOH. The remarkable catalytic performance of the self-supported Al-CoP/NF is closely associated with its outstanding structural advantages such as a 3D conductive framework, fascinating porous characteristics and Al doping. This study might open up a new route to improve the activity and durability of self-supported electrocatalysts by heteroatom doping.

中文翻译：

在三维Ni泡沫上生长的自支撑Al掺杂的磷化钴纳米片，用于高效减水和氧化†

开发用于整体水分解的高效非贵金属电催化剂，对于未来的可再生能源转换和存储系统仍然是一个巨大的挑战。本文中，使用CoAl层双氢氧化物前体通过简单的低温磷酸化方法在三维（3D）泡沫镍（Al-CoP / NF）上合成了交联的Al掺杂CoP纳米片。在所有pH值下都朝着氢气析出反应（HER）的方向移动，低过电势分别为51 mV（0.5 MH ₂ SO ₄，pH = 0），66 mV（1.0 M KOH，pH = 14）和83 mV（1.0 M PBS）， pH = 7）以实现10 mA cm ^-2的电流密度。此外，该自支撑电极在碱性介质中对氧释放反应（OER）表现出出色的活性，在330 mV的超电势下提供10 mA cm ^-2的阳极电流密度。结果，在1.0M KOH中的长期总体水分解操作中，作为双功能电催化剂的Al-CoP / NF可以在1.63V的电池电压下提供10mA cm ^-2的电流密度。自支撑Al-CoP / NF的出色催化性能与其3D导电骨架，引人入胜的多孔特性和Al掺杂等突出的结构优势密切相关。这项研究可能会开辟一条新的途径，以通过杂原子掺杂来改善自支撑电催化剂的活性和耐久性。

更新日期：2018-10-26

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