Solar light driven hydrogen evolution is a prospective strategy to solve the energy problem. However, the poor photoresponse, low photocurrent density and easy electron-hole recombination remarkably restrict the HER activity of the conventional photocatalyst. Herein, we constructed a CdS@hexagonal boron nitride (h-BN) heterostructure on reduced graphene oxide (rGO) to synthesize a ternary CdS@h-BN/rGO catalyst via a structural reconstruction strategy. The CdS@h-BN heterointerface promoted the electrons transferring to the CdS active centers from the valence band of h-BN under photoinduction, overcoming the wide bandgap defect of pristine h-BN. The easily photoexcited property of CdS cocatalyst resulted in superhigh photocurrent density (2.7·μA cm⁻²) under simulated solar light, which was 3.3-fold greater of pristine CdS NPs. Meanwhile, the interfacial interactions of three components remarkably restrained the carriers recombination. Hence, the resultant ternary hybrid catalyst presented remarkably improved photoresponse and interfacial conductivity, thereby the optimal catalyst represented remarkably enhanced HER activity (6465.33 μmol h⁻¹ g⁻¹) under simulated solar light, which was about 10.9-fold greater of the pristine CdS NPs and 218.3-fold greater of the optimal h-BN/rGO hybrid. About 19.8 % of apparent quantum yield was achieved under illumination of λ =420 nm, and the excellent regenerability and durability were represented during six cycles and 20 h of continued illumination. Thereby, this study provides a prospective idea for constructing low-cost nonprecious metal based photocatalyst with highly efficient HER performance.

太阳光驱动的氢气释放是解决能源问题的一种前瞻性策略。然而，不良的光响应，低的光电流密度和容易的电子-空穴复合显着地限制了常规光催化剂的HER活性。本文中，我们在还原氧化石墨烯（rGO）上构建了CdS @六方氮化硼（h-BN）异质结构，以通过结构重建策略合成三元CdS @ h-BN / rGO催化剂。CdS @ h-BN异质界面促进了电子在光诱导下从h-BN的价带转移到CdS活性中心，克服了原始h-BN的宽带隙缺陷。CdS助催化剂的易光激发特性导致超高的光电流密度（2.7·μAcm ^-2）在模拟的太阳光下，是原始CdS NP的3.3倍。同时，三种组分的界面相互作用显着抑制了载流子的重组。因此，所得三元杂化催化剂表现出显着改善的光响应和界面电导率，从而最佳催化剂表现出显着增强的HER活性（6465.33μmolh ^-1  g ^-1）在模拟太阳光下，比原始CdS NP约大10.9倍，比最佳h-BN / rGO杂种高218.3倍。在λ= 420 nm的光照下可获得约19.8％的表观量子产率，并且在六个周期和20 h的连续光照下表现出优异的可再生性和耐久性。因此，本研究为构建具有高效HER性能的低成本非贵金属基光催化剂提供了前瞻性的想法。