A mononuclear Ru aquo complex, [Ru(C₈Otpy)(H₂dcbpy)(OH₂)]²⁺ (C₈Otpy = 4′-octyloxy-2,2′:6′,2′′-terpyridine, H₂dcbpy = 4,4′-dicarboxy-2,2′-bipyridine) was stably adsorbed on a nanoporous TiO₂ surface to afford a TiO₂ electrode anchoring the complex. The adsorption isothermal of the complex on the TiO₂ surface was analyzed by the Langmuir adsorption model to provide a maximum coverage of Г_max = 4.4 × 10⁻⁸ mol cm⁻² and an adsorption equilibrium constant of K_ads = 1.1 × 10⁴ M⁻¹, suggesting that the monolayer of the complex is formed on the TiO₂ surface. The cyclic voltammetry measurement of the complex on the TiO₂ surface suggested the diffusion-controlled charge transport via electron hopping between the complexes through the TiO₂ layer. Pourbaix diagram showed that the complex undergoes a non-H⁺-coupled 1e- redox reaction of a Ru^IIOH/Ru^IIIOH pair of the complex on the TiO₂ electrode due to pH buffering ability of the TiO₂ surface in a range of pH 5−11. Bulk electrolysis at 1.7 V vs Ag/AgCl using the complex-anchoring TiO₂ electrode provided a high and steady catalytic current density of 0.39 mA cm⁻² with 83 % Faradaic efficiency for O₂ evolution during 1 h electrolysis. However, we presume that the complex is transformed to RuO_x nanoparticles on the TiO₂ electrode during the electrocatalysis, on the basis of our earlier report on the complex / mesoporous ITO electrode system (Dalton Trans., 2020, 49, 1416−1423.). The RuOH/TiO₂ electrode is the efficient anode for water oxidation under the acidic conditions, irrespective of the molecular catalyst of RuOH and the alternative catalysts formed via its oxidative transformation.

单核钌水络合物[Ru（C ₈ Otpy）（H ₂ dcbpy）（OH ₂）] ²⁺（C ₈ Otpy = 4'-辛氧基-2,2'：6'，2''-叔吡啶，H_将2 dcbpy = 4,4'-二羧基-2,2'-联吡啶稳定地吸附在纳米多孔TiO ₂表面上，从而得到固定复合物的TiO ₂电极。复在TiO上的吸附等温₂表面通过Langmuir吸附模型分析，以提供最大覆盖Г_最大 = 4.4×10 ^-8摩尔厘米^-2和的吸附平衡常数ķ_广告 = 1.1×10^在图4M ^-1中，表明在TiO ₂表面上形成了络合物的单层。在TiO ₂表面上对络合物进行的循环伏安法测量表明，络合物之间的电子跳跃通过TiO ₂层，通过电子跳跃实现了扩散控制的电荷传输。Pourbaix图显示，由于TiO ₂表面在一定范围内的pH缓冲能力，该络合物在TiO ₂电极上经历了络合物的Ru ^II OH / Ru ^III OH对的非H ⁺偶联的1e-氧化还原反应。 pH 5-11。1.7 V的本体电解vs使用固定复合物的TiO ₂电极的Ag / AgCl提供了0.39 mA cm ^-2的高且稳定的催化电流密度，在1 h电解中析出O _2的法拉第效率为83％。然而，我们推测该复合物转化成的RuO _X上的TiO 2纳米颗粒₂的电催化过程中电极，该复合物/孔ITO电极系统上（我们较早的报告的基础上道尔顿横贯。，2020，49，1416年至1423年。 ）。所述RuOH /的TiO ₂电极是用于在酸性条件下的水氧化的有效阳极，而不论分子催化剂的RuOH以及通过其氧化转化形成的替代催化剂。