Exploring highly efficient, robust, and stable catalysts for urea electrolysis is intensively desirable for hydrogen production but remains a challenging task. In this work, novel, well-aligned, self-supported NiS/Ni₃S₄ heteronanorod arrays deposited on graphitized carbonized wood (GCW) are designed (denoted as NiS/Ni₃S₄/GCW) and synthesized by a facile hydrothermal sulfidation strategy. Benefitting from the optimized surface hydrophilicity/aerophobicity, enhanced electrical conductivity, and 3D hierarchical directional porous architectures, the NiS/Ni₃S₄/GCW show excellent activity toward the urea oxidation reaction and hydrogen evolution reaction in alkaline electrolytes. The arrays achieved a low potential of 1.33 V (vs. RHE) and 91 mV (overpotential) at 10 mA cm⁻² as well as robust stability for 100 h. Significantly, when employed as anode and cathode simultaneously, the urea electrolyzer constructed by NiS/Ni₃S₄/GCW catalysts merely requires a low voltage of 1.44 V to drive 10 mA cm⁻² with superior stability for 50 h. This work not only demonstrates the application of heterogeneous sulfide for urea-assisted hydrogen production but also provides an effective guideline for using renewable wood for designing efficient catalysts in an economical way.

探索用于尿素电解的高效、稳健和稳定的催化剂是制氢的迫切需要，但仍然是一项具有挑战性的任务。在这项工作中，设计了沉积在石墨化碳化木材 (GCW) 上的新型、排列良好、自支撑的 NiS/Ni ₃ S ₄异质纳米棒阵列（表示为 NiS/Ni ₃ S ₄ /GCW）并通过简便的水热硫化合成战略。得益于优化的表面亲水性/疏气性、增强的导电性和 3D 分层定向多孔结构，NiS/Ni ₃ S ₄/GCW对碱性电解液中的尿素氧化反应和析氢反应表现出优异的活性。^{该阵列在 10 mA cm -2}下实现了 1.33 V（相对于 RHE）和 91 mV（过电势）的低电位以及100小时的稳健稳定性。值得注意的是，当同时用作阳极和阴极时，由 NiS/Ni ₃ S ₄ /GCW 催化剂构成的尿素电解槽仅需 1.44 V 的低电压即可驱动 10 mA cm ^-2并在 50 小时内具有出色的稳定性。这项工作不仅展示了多相硫化物在尿素辅助制氢中的应用，而且为使用可再生木材以经济的方式设计高效催化剂提供了有效的指导。