The development of non-precious metal electrocatalysts is an effective approach to achieving environmentally friendly electrolytic water for hydrogen production. In this paper, we report a method for the rapid preparation of excellent HER activity and durable WC thin-film electrodes using one-pot electrolysis with K₂CO₃ − Na₂CO₃ molten salts. During the electrolysis, soluble carbonate anions reduced and in situ formed WC nanoparticles on a tungsten cathode, which become firmly immobilized on the surface of the tungsten cathode, resulting in the formation of the WC/W electrode. The WC/W electrode exhibited efficient electrocatalytic HER activity, good reaction kinetics and long-term stability. In particular, the WC/W-3.1 V catalysts exhibited low overpotentials (127 mV and 221 mV) at current densities of 10 mA ${\mathrm{\text{cm}}}^{-2}$ and 50 mA ${\mathrm{\text{cm}}}^{-2}$, along with a small Tafel slopes (129.00 mV dec${}^{-1}$). The experimental results indicate that the WC/W electrode possesses more electrochemical active site, faster electron transfer rate and strong interfacial interaction and stability. This binder-free WC thin film electrode rapid preparation method via molten salts electrolysis provides a new approach for the development of highly active electrocatalysts.

开发非贵金属电催化剂是实现环保电解水制氢的有效途径。_{在本文中，我们报道了一种利用K 2} CO ₃ − Na ₂ CO ₃熔盐一锅电解快速制备优异的HER活性和耐用的WC薄膜电极的方法。在电解过程中，可溶性碳酸根阴离子还原并原位在钨阴极上形成 WC 纳米颗粒，这些纳米颗粒牢固地固定在钨阴极表面，从而形成 WC/W 电极。WC/W电极表现出高效的电催化HER活性、良好的反应动力学和长期稳定性。特别是，WC/W-3.1 V 催化剂在 10 mA 的电流密度下表现出较低的过电势（127 mV 和 221 mV）${\mathrm{\text{厘米}}}^{-2}$和 50 毫安${\mathrm{\text{厘米}}}^{-2}$，以及一个小的 Tafel 斜率（129.00 mV dec${}^{-1}$）。实验结果表明，WC/W电极具有更多的电化学活性位点、更快的电子转移速率以及较强的界面相互作用和稳定性。这种通过熔盐电解快速制备无粘合剂WC薄膜电极的方法为高活性电催化剂的开发提供了新途径。