Co0.5Ni0.5P nanoparticles embedded in carbon layers for efficient electrochemical water splitting
Co0.5Ni0.5P nanoparticles embedded in carbon layers for efficient electrochemical water splitting
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DOI：
10.1016/j.jallcom.2018.06.008
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发表时间：
2018-10
影响因子：
6.2
通讯作者：
Chuanlai Jiao;Mehboob Hassan;X. Bo;Ming Zhou
中科院分区：
文献类型：
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作者：
Chuanlai Jiao;Mehboob Hassan;X. Bo;Ming Zhou
因此，人们迫切需要一种高效、低成本、资源丰富的水裂解电催化剂。在这项工作中，CoxNi 1-x-次氮基三乙酸配合物负载在商业泡沫镍通过一个简单的水热方法。在泡沫镍表面制备了CoxNi 1-xP纳米颗粒，并通过磷化处理将CoxNi 1-xP纳米颗粒嵌入到碳层中，制备了具有析氢和析氧双功能的碱性电催化剂。对于阴极析氢反应催化性能，嵌在泡沫镍（NF）上的碳层中的Co0.5Ni0.5P纳米颗粒（Co0.5Ni0.5P/NC/NF）需要90.0 mV的过电位以提供10 mA cm-2的电流密度，接近在NF（Pt/C/NF）催化剂上制造的商业Pt/C的电流密度。作为阳极析氧反应电催化剂，在低至1.56 V的电位下，电流密度响应为50 mA cm-2，显示出接近RuO 2/NF的上级性能。此外，在碱性电解槽中，CoxNi 1-xP纳米颗粒需要1.49 V的低电位才能达到20 mA cm− 2的电流密度，以实现完全的水分解。
Active, low-cost and abundant electrocatalysts for water splitting (i.e. both hydrogen evolution reaction and oxygen evolution reaction) with high efficiency is highly desired. In this work, CoxNi1-x-nitrilotriacetic acid complexes are supported on commercial nickel foam by a simple hydrothermal method. Followed by phosphorization, CoxNi1-xP nanoparticles embedded into by nitrogen-doped carbon layer are synthesized on nickel foam, serving as bifunctional alkaline electrocatalysts for both hydrogen evolution reaction and oxygen evolution reaction. For the cathodic hydrogen evolution reaction catalytic performance, Co0.5Ni0.5P nanoparticles embedded in carbon layers on nickel foam (NF) (Co0.5Ni0.5P/NC/NF) requires an overpotential of 90.0 mV to deliver current density of 10 mA cm−2, approaching that of commercial Pt/C which was fabricated on NF (Pt/C/NF) catalyst. As an anodic oxygen evolution reaction electrocatalyst, with a potential as low as 1.56 V, the current density response is 50 mA cm−2, showing superior performance close to RuO2/NF. Moreover, in the alkaline electrolyzer, CoxNi1-xP nanoparticles require a low potential of 1.49 V to achieve a current density of 20 mA cm−2for full water splitting.