Academy of Scientific and Innovative Research (AcSIR) , CSIR-Central Electrochemical Research Institute (CSIR-CECRI) Campus , New Delhi , India.
CSIR-Central Electrochemical Research Institute (CECRI) , Karaikudi 630003 , Tamil Nadu , India.
Inorg Chem. 2019 Feb 4;58(3):1895-1904. doi: 10.1021/acs.inorgchem.8b02680. Epub 2019 Jan 16.
Evaluation of unique catalysts of the iron group metals with activity in the OER region similar to that of scarce metals is of great importance to achieve sustainable production of H on a large scale. Herein, we report the unique nanosheets of nickel iron hydroxy carbonate hydrate (NiFeHCH) which were prepared through a wet-chemical route within 1 h of reaction time, acting as an efficient electrocatalyst for the oxygen evolution reaction (OER) in both alkaline and near-neutral media. The NiFeHCH was prepared with different concentrations of Fe in different ratios: 1:0.2, 1:0.4, 1:0.6, 1:0.8, and 1:1. Among them, nanosheets of NiFeHCH (1:0.2) were found to have superior OER activity, which required an overpotential of 250 mV to reach 20 mA cm with a very low Tafel slope value of 39 mV/decade in 1 M KOH. Nanosheets with other ratios also had comparable OER activity with overpotentials ranging from 256 to 290 mV with Tafel slope values from 39 to 49 mV/decade. Nanosheets of NiFeHCH electrocatalysts screened for the OER in 1 M NaHCO (pH ∼8.5) required overpotentials for all of the ratios ranging from 389 to 507 mV at 10 mA cm and Tafel slope values from 155 to 205 mV/decade, of which nanosheets of NiFeHCH (1:0.4) showed better activity by requiring an overpotential of 389 mV at 10 mA cm and Tafel slope value of 155 mV/decade. With these fruitful advantages, these prepared nanosheets of NiFeHCH can be a better alternative to scarce metals for industrial water electrolysis.
评估具有与稀缺金属相似的 OER 区域活性的铁族金属的独特催化剂对于大规模可持续生产 H 至关重要。在此，我们报告了独特的镍铁羟基碳酸盐水合物（NiFeHCH）纳米片，其通过在 1 小时的反应时间内通过湿化学途径制备，在碱性和近中性介质中作为高效的析氧反应（OER）电催化剂。NiFeHCH 是用不同浓度的 Fe 以不同的比例制备的：1:0.2、1:0.4、1:0.6、1:0.8 和 1:1。其中，发现 NiFeHCH（1:0.2）纳米片具有优异的 OER 活性，在 1 M KOH 中达到 20 mA cm 时需要 250 mV 的过电势，Tafel 斜率值非常低，为 39 mV/decade。其他比例的纳米片也具有可比的 OER 活性，过电势范围为 256 至 290 mV，Tafel 斜率值范围为 39 至 49 mV/decade。筛选用于 1 M NaHCO（pH∼8.5）中的 OER 的 NiFeHCH 纳米片电催化剂在所有比例下的过电势均为 389 至 507 mV，在 10 mA cm 时的 Tafel 斜率值为 155 至 205 mV/decade，其中 NiFeHCH（1:0.4）纳米片的活性更好，需要 389 mV 的过电势和 155 mV/decade 的 Tafel 斜率值。有了这些丰硕的优势，这些制备的 NiFeHCH 纳米片可以成为工业水电解中稀缺金属的更好替代品。
