The solar-driven photoelectrocatalytic oxidation of urea is an efficient and costly way to produce hydrogen and purify wastewater synergistically. However, it is still a big challenge facing to the semiconductor-catalyst photoanode with high utilization of sunlight. Herein, we report a series of La-Ni-based Ruddlesden-Popper phases perovskite materials (La_n+1Ni_nO_3n+1, n = 1, 2 and 3) for photoelectrocatalytic oxidations of urea. Such La-Ni -based perovskite materials act simultaneously as a light-harvesting semiconductor and as the electrocatalyst for urea oxidation and all of La_n+1Ni_nO_3n+1 catalysts display a strong near-infrared (NIR) light absorption (≥ 800 nm). The La₄Ni₃O₁₀ catalyst exhibits the best activity towards urea oxidation reaction (UOR) with an applied potential of 1.54 V vs. RHE at 1 mA cm^-2, compared to that of 1.64 V and 1.56 V vs. RHE for La₂NiO₄ and La₃Ni₂O₇, respectively, and 44.7 μmol cm^-2h^-1 of N₂ generation rate under NIR light irradiation at the potential of 1.62 V vs. RHE, which is 2.5 times and 1.8 times of that for La₂NiO₄ and La₃Ni₂O₇, respectively. The unique structure of La₄Ni₃O₁₀ accelerates the separation and transport of electrons and holes, which is beneficial for the diffusion and adsorption of urea molecules in photoanode.

太阳能驱动的尿素光电催化氧化是一种高效且昂贵的协同生产氢气和净化废水的方法。然而，对于太阳光利用率高的半导体催化剂光阳极来说，这仍然是一个很大的挑战。在此，我们报告了一系列用于尿素光电催化氧化的 La-Ni 基 Ruddlesden-Popper 相钙钛矿材料（La _n+1 Ni _n O _3n+1，n = 1、2 和 3）。这种基于 La-Ni 的钙钛矿材料同时作为集光半导体和尿素氧化的电催化剂和所有的 La _n+1 Ni _n O _3n+1催化剂显示出强烈的近红外 (NIR) 光吸收 (≥ 800 nm)。La ₄ Ni ₃ O ₁₀催化剂对尿素氧化反应 (UOR) 表现出最佳活性，在 1 mA cm ^{-2下施加电位为 1.54 V} vs. RHE ，而 La 的施加电位为 1.64 V 和 1.56 V vs. RHE ₂ NiO ₄和La ₃ Ni ₂ O ₇分别为44.7 μmol cm ^-2 h ^-1在NIR光照射下的N ₂生成速率在1.62 V vs.RHE分别是La ₂ NiO ₄和La ₃ Ni ₂ O ₇的2.5倍和1.8倍。La ₄ Ni ₃ O ₁₀的独特结构加速了电子和空穴的分离和传输，有利于尿素分子在光电阳极中的扩散和吸附。