催化作用
电化学
材料科学
氢
无机化学
化学
电极
物理化学
生物化学
有机化学
作者
Sumanth Dongre S,Asif Iqbal,Ranjit Thapa,M. Pratheeksha,R. Shwetharani,R. Geetha Balakrishna
标识
DOI:10.1021/acsaenm.4c00027
摘要
Developing a cost-effective and earth-abundant electrocatalyst to produce green hydrogen is vital toward sustainable energy with a net-zero carbon emission. In this regard, abundantly available nanostructured transition metals with a tunable structure, high surface area, and high conductivity are considered to be suitable cathode materials for water splitting. Herein, we design a 3D/2D Fe2O3/MoS2/Ti3C2Tx MXene ternary composite through hydrothermal synthesis for electrochemical hydrogen evolution. The 3D/2D composite of Fe2O3 nanoparticles with MoS2 nanosheets showed exceptional electrocatalytic activity with an overpotential and a Tafel slope of 194.1 mV and 102 mV/dec, respectively, which outperforms pristine Fe2O3 nanoparticles and MoS2 nanosheets by a great margin of over 50 mV. To further enhance the electrical conductivity, exfoliated Ti3C2Tx MXene is introduced to form a ternary composite, and it is found that this composite electrocatalyst shows an impressive overpotential of 123 mV at a current density of 10 mA/cm2 in an acidic medium, with high durability over 12 h for hydrogen evolution. The smaller charge-transfer resistance (88.2 Ω) and larger double-layer capacitance (12 mF/cm2) values of the ternary composite with a low Tafel slope of 71 mV/dec indicate the role of enhanced interfacial charge transfer and specific surface area inducing enhanced HER activity.
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