Bifunctionality from Synergy: CoP Nanoparticles Embedded in Amorphous CoOx Nanoplates with Heterostructures for Highly Efficient Water Electrolysis,Advanced Science

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Bifunctionality from Synergy: CoP Nanoparticles Embedded in Amorphous CoOx Nanoplates with Heterostructures for Highly Efficient Water Electrolysis
Advanced Science ( IF 14.3 ) Pub Date : 2018-07-13 , DOI: 10.1002/advs.201800514
Jie Yu ₁ , Yijun Zhong ₂ , Xinhao Wu ₁ , Jaka Sunarso ₃ , Meng Ni ₄ , Wei Zhou ₁ , Zongping Shao _{1,

2}

Affiliation

Hydrogen production from renewable electricity relies upon the development of an efficient alkaline water electrolysis device and, ultimately, upon the availability of low cost and stable electrocatalysts that can promote oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). Normally, different electrocatalysts are applied for HER and OER because of their different reaction intermediates and mechanisms. Here, the synthesis of a heterostructured CoP@a‐CoOx plate, which constitutes the embedded crystalline cobalt phosphide (CoP) nanoclusters and amorphous cobalt oxides (CoOx) nanoplates matrix, via a combined solvothermal and low temperature phosphidation route is reported. Due to the presence of synergistic effect between CoP nanoclusters and amorphous CoOx nanoplates in the catalyst, created from the strong nanointerfaces electronic interactions between CoP and CoOx phases in its heterostructure, this composite displays very high OER activity in addition to favorable HER activity that is comparable to the performance of the IrO₂ OER benchmark and approached that of the Pt/C HER benchmark. More importantly, an efficient and stable alkaline water electrolysis operation is achieved using CoP@a‐CoOx plate as both cathode and anode as evidenced by the obtainment of a relatively low potential of 1.660 V at a 10 mA cm⁻² current density and its marginal increase above 1.660 V over 30 h continuous operation.

中文翻译：

协同作用的双功能：嵌入具有异质结构的非晶 CoOx 纳米板中的 CoP 纳米颗粒可实现高效水电解

利用可再生电力生产氢气依赖于高效碱性水电解装置的开发，并最终依赖于能够促进析氧反应（OER）和析氢反应（HER）的低成本且稳定的电催化剂的可用性。通常，由于反应中间体和机理不同，HER和OER采用不同的电催化剂。在此，报道了通过溶剂热和低温磷化相结合的途径合成异质结构CoP@a-CoOx板，该板由嵌入的结晶磷化钴（CoP）纳米团簇和无定形氧化钴（CoOx）纳米板基质组成。由于催化剂中 CoP 纳米团簇和无定形 CoOx 纳米板之间存在协同效应，这是由其异质结构中 CoP 和 CoOx 相之间强纳米界面电子相互作用产生的，因此该复合材料除了具有可比的良好 HER 活性外，还表现出非常高的 OER 活性。达到 IrO ₂ OER 基准的性能并接近 Pt/C HER 基准的性能。^{更重要的是，使用CoP@a-CoOx板作为阴极和阳极实现了高效稳定的碱性水电解操作，在10 mA cm -2}电流密度下获得了1.660 V的相对较低电势及其边际证明连续运行 30 小时后电压升高至 1.660 V 以上。

更新日期：2018-07-13

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