Dataset of "6R-TaS₂ Anchored on Mo Foil as a Robust Electrocatalyst for Hydrogen Evolution"

Affordable and durable HER catalysts are critical for sustainable hydrogen production. We report electrochemically exfoliated TaS2 nanosheets, predominantly in the metallic 6R phase, anchored on conductive Mo foil. The optimized hybrid (0.8 mg TaS2) initiates HER at −0.06 V vs RHE and reaches −10 mA cm⁻² at only 115 mV overpotential. Fast kinetics (Tafel 68 mV dec⁻¹), low charge transfer resistance, and high active surface area (~5.5 cm²) account for its superior activity and durability (22% loss after 40,000 s). Compared to TaS2 drop cast on glassy carbon, the Mo substrate boosts performance by facilitating electron transport and proton adsorption. This work demonstrates substrate engineering combined with metallic TMD phases as a scalable route to high performance, earth abundant HER catalysts. Beyond performance, this study highlights the largely unexplored potential of the 6R polymorph, whose intrinsic metallicity and distinct stacking offer new opportunities for interface engineering in 2D electrocatalysts.低成本且耐用的析氢反应（HER, Hydrogen Evolution Reaction）催化剂对于可持续制氢至关重要。本研究报道了一种负载于导电钼箔之上、以金属性6R相为主相的电化学剥离二硫化钽（TaS₂）纳米片催化剂。优化后的杂化催化体系（负载0.8 mg TaS₂）在相对于可逆氢电极（RHE, Reversible Hydrogen Electrode）的-0.06 V电位下即可启动析氢反应，仅需115 mV过电位即可达到10 mA cm⁻²的电流密度。快速的反应动力学（塔菲尔（Tafel）斜率为68 mV dec⁻¹）、低电荷转移电阻以及高活性比表面积（约5.5 cm²）是其优异催化活性与稳定性的核心原因：在40000秒的持续测试后，催化活性仅衰减22%。相较于滴涂于玻碳（glassy carbon）表面的TaS₂样品，钼基底通过促进电子传输与质子吸附，显著提升了整体催化性能。本研究证明，将基底工程策略与金属性过渡金属硫族化合物（TMD, Transition Metal Dichalcogenides）物相结合，是一条可规模化制备高性能、地球储量丰富的析氢反应催化剂的可行路径。除催化性能外，本研究还凸显了6R多晶型物尚未被充分开发的应用潜力：其本征金属性与独特的堆叠方式为二维电催化剂的界面工程提供了全新的研究方向。