3D‐Graphene Decorated with g‐C3N4/Cu3P Composite: A Noble Metal‐free Bifunctional Electrocatalyst for Overall Water Splitting,ChemCatChem

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3D‐Graphene Decorated with g‐C3N4/Cu3P Composite: A Noble Metal‐free Bifunctional Electrocatalyst for Overall Water Splitting
ChemCatChem ( IF 3.8 ) Pub Date : 2020-01-17 , DOI: 10.1002/cctc.201902065
Sk. Riyajuddin ₁ , S. K. Tarik Aziz ₂ , Sushil Kumar ₁ , Gilbert D. Nessim ₂ , Kaushik Ghosh ₁

Affiliation

Electrochemical water splitting, which generates both hydrogen and oxygen, using highly efficient and low‐cost noble metal‐free (Pt, Ru, Ir etc.) electrocatalyst is an economical and green approach for the alternative energy source. Due to their conductivity, durability and long‐term stability, carbonaceous containing hybrid materials are used as promising electrodes for total water splitting. Herein, the design of metal‐phosphide (Cu₃P) with graphitic carbon‐nitride (g‐C₃N₄) nanocomposite on 3D‐graphene is reported, a new model electrocatalyst that in turn, render superior electrocatalytic performance with long‐term stability. The excellent electrocatalytic performance is analyzed in terms of overpotentials of 67 mV and 255 mV at a current density of 10 mA/cm² with a small Tafel slope of 45 and 40 mV/dec for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), respectively. The overall water splitting performance has been tested in 1 M KOH electrolyte, and the catalyst exhibits a very low cell voltage of 1.54 V to achieve a current density of 10 mA/cm² with impressive stability of at least 35 hours with no loss of potential. This work sheds new insight into the design and synthesis of highly stable electrocatalyst that could be an apt choice for an attractive paradigm for commercial water electrolysis in renewable electrochemical energy conversion.

中文翻译：

用g-C3N4 / Cu3P复合材料装饰的3D-石墨烯：一种无贵金属的双功能电催化剂，可用于总水分解

使用高效且低成本的无贵金属（Pt，Ru，Ir等）电催化剂进行水分解产生氢和氧的电化学方法是替代能源的一种经济且绿色的方法。由于其导电性，耐用性和长期稳定性，含碳杂化材料被用作总水分解的有前途的电极。在此，设计了具有石墨化碳氮化物（g-C ₃ N ₄的金属磷化物（Cu ₃ P））报道了3D-石墨烯上的纳米复合材料，这是一种新型的电催化剂，又可以提供出色的电催化性能和长期稳定性。在电流密度为10 mA / cm ²且Tafel斜率较小的45和40 mV / dec的Tafel斜率下，过电势分别为67 mV和255 mV，用于析氢反应（HER）和析氧反应（ OER）。已在1 M KOH电解质中测试了总的水分解性能，该催化剂的电池电压非常低，仅为1.54 V，电流密度为10 mA / cm ²具有至少35小时的出色稳定性，并且不会损失任何潜能。这项工作为高度稳定的电催化剂的设计和合成提供了新的见识，这可能是在可再生电化学能量转换中用于商业水电解的有吸引力的范例的合适选择。

更新日期：2020-01-17

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