Precision and correctness in the evaluation of electrocatalytic water splitting: revisiting activity parameters with a critical assessment,Energy & Environmental Science

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Precision and correctness in the evaluation of electrocatalytic water splitting: revisiting activity parameters with a critical assessment
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2018-02-21 00:00:00 , DOI: 10.1039/c7ee03457a
S. Anantharaj _{1,

2,

3,

4,

5} , S. R. Ede _{1,

2,

3,

4,

5} , K. Karthick _{1,

2,

3,

4,

5} , S. Sam Sankar _{1,

2,

3,

4,

5} , K. Sangeetha _{1,

2,

3,

4,

5} , P. E. Karthik _{4,

6,

7,

8} , Subrata Kundu _{1,

2,

3,

4,

5}

Affiliation

The number of research reports published in recent years on electrochemical water splitting for hydrogen generation is higher than for many other fields of energy research. In fact, electrochemical water splitting, which is conventionally known as water electrolysis, has the potential to meet primary energy requirements in the near future when coal and hydrocarbons are completely consumed. Due to the sudden and exponentially increasing attention on this field, many researchers across the world, including our group, have been exerting immense efforts to improve the electrocatalytic properties of the materials that catalyze the oxygen evolution reaction (OER) at the anode and the hydrogen evolution reaction (HER) at the cathode, aided by the recent revolutionary discovery of nanomaterials. However, the pressure on the researchers to publish their findings rapidly has caused them to make many unnoticed and unintentional errors, which is mainly due to lack of clear insight on the activity parameters. In this perspective, we have discussed the use and validity of ten important parameters, namely overpotential at a defined current density, iR-corrected overpotential at a defined current density, Tafel slope, exchange current density (j₀), mass activity, specific activity, faradaic efficiency (FE), turnover frequency (TOF), electrochemically active surface area (ECSA) and measurement of double layer capacitance (C_dl) for different electrocatalytic materials that are frequently employed in both OER and HER. Experimental results have also been provided in support of our discussions wherever required. Using our critical assessments of the activity parameters of water splitting electrocatalysis, researchers can ensure precision and correctness when presenting their data regarding the activity of an electrocatalyst.

中文翻译：

电催化水分解评估的准确性和正确性：通过严格评估重新评估活性参数

近年来发表的有关用于氢生成的电化学水分解的研究报告的数量高于许多其他能源研究领域。实际上，通常称为水电解的电化学水分解技术有可能在不久的将来完全消耗煤和碳氢化合物时满足一次能源的需求。由于对该领域的突然和成倍增长的关注，包括我们小组在内的世界各地的许多研究人员都在做出巨大的努力，以改善在阳极和氢气处催化氧释放反应（OER）的材料的电催化性能。最近，纳米材料有了革命性的发现，在阴极上发生了析出反应（HER）。然而，研究人员迅速发表研究结果的压力导致他们犯了许多不为人知和无意的错误，这主要是由于对活动参数缺乏清晰的认识。从这个角度出发，我们讨论了十个重要参数的使用和有效性，即在定义的电流密度下过电势，在定义的电流密度下iR校正的过电势，Tafel斜率，交换电流密度（j ₀），质量活性，比活，法拉第效率（FE），周转频率（TOF），电化学活性表面积（ECSA）以及两种OER中经常使用的不同电催化材料的双层电容（C _dl）的测量和她。如有需要，还提供了实验结果以支持我们的讨论。使用我们对水分解电催化活性参数的严格评估，研究人员在展示有关电催化剂活性的数据时可以确保准确性和正确性。

更新日期：2018-02-21

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