A simple method for preparation of Pt, CQDs-coloaded graphene composite for hydrogen evolution reaction (HER) is established by electrolysis-solvothermal process. Graphene is obtained by electrochemical exfoliation of graphite in cathode, while carbon quantum dots (CQDs) and Pt nanoparticles (NPs) are in-situ generated in the electrolyte simultaneously. CQDs are evolved from propylene carbonate solvent and Pt NPs are derived from reduction of Pt intermediate species generated from anodic dissolution of Pt counter electrode during electrolysis process. Then Pt NPs and CQDs are well dispersed on graphene at subsequent solvothermal process. Work voltage and electrolyte type as the key electrolysis conditions are applied to control the concentration of CQDs and Pt NPs, which decides electrochemically active surface area and HER activity of obtained catalysts. Significantly, the obtained superior catalyst with trace amount of Pt (0.145 wt%), shows markedly enhanced catalytic HER activity with mass activity of 37.5 A mg⁻¹ at −50 mV in acidic solution, 68.2 times more active than Pt/C. This study provides a universal and promising methodology for synthesizing Pt, CQDs coloaded hybrid with the assistance of electric field as cost-effective catalysts for fuel cells.

通过电解-溶剂热法建立了一种简单的制备Pt，CQDs负载的石墨烯复合物用于放氢反应（HER）的简单方法。石墨烯是通过在阴极中对石墨进行电化学剥离而获得的，而碳量子点（CQDs）和Pt纳米颗粒（NPs）在电解质中同时就地生成。CQD是由碳酸亚丙酯溶剂演变而来的，而Pt NPs是由电解过程中Pt对电极的阳极溶解所产生的Pt中间物种的还原而衍生的。然后，在随后的溶剂热过程中，Pt NP和CQD很好地分散在石墨烯上。以工作电压和电解液类型为关键电解条件来控制CQDs和Pt NPs的浓度，它决定了所得催化剂的电化学活性表面积和HER活性。重要的是，所获得的具有痕量Pt（0.145 wt％）的优良催化剂显示出显着增强的HER催化活性，质量活性为37.5 A mg在-50 mV的酸性溶液中为^-1，活性是Pt / C的68.2倍。这项研究提供了一种通用且有前途的方法，可在电场的帮助下合成Pt，CQDs共载杂化体，作为燃料电池的经济高效催化剂。