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Operando Reconstruction toward Dual-Cation-Defects Co-Containing NiFe Oxyhydroxide for Ultralow Energy Consumption Industrial Water Splitting Electrolyzer
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2023-01-15 , DOI: 10.1002/aenm.202203595 Yingxia Zhao 1 , Qunlei Wen 2 , Danji Huang 3 , Chi Jiao 4 , Youwen Liu 2 , Yan Liu 4 , Jiakun Fang 3 , Ming Sun 1, 5 , Lin Yu 1, 5
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2023-01-15 , DOI: 10.1002/aenm.202203595 Yingxia Zhao 1 , Qunlei Wen 2 , Danji Huang 3 , Chi Jiao 4 , Youwen Liu 2 , Yan Liu 4 , Jiakun Fang 3 , Ming Sun 1, 5 , Lin Yu 1, 5
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Nickel–iron oxygen evolution catalysts have been under the spotlight as substitutes for precious metals, however, they rarely operate efficiently in practical industrial electrolyzers due to their moderate activity. Guided by density functional theory, the interaction of cation vacancies and dopants can manipulate d band centers, thus gaining near-optimal binding energies of the oxygenated intermediates and ultralow potentials. This principle is implemented experimentally by catalysis operando variations synthesis, more specifically, in situ Mo leaching from high-entropy Co, Mo co-doped NiFe hydroxide precursors form Co dopant and cation vacancy coexistent NiFe oxyhydroxide. Operando electrochemical spectroscopy uncovers that dual-cation-defects promote the readier oxidation transition of metal sites, thus contributing to a low overpotential of 255 mV at 100 mA cm−2. Furthermore, dual-regulated NiFe oxyhydroxide electrodes operate stably at 8 A in practical industrial electrolyzers with ultralow energy consumption of ≈4.6 kWh m−3 H2, verifying the feasibility of lab-constructed novel catalysts towards industrialization.
中文翻译：
用于超低能耗工业水分解电解槽的双阳离子缺陷共含 NiFe 羟基氧化物的原位重构
镍-铁析氧催化剂作为贵金属的替代品一直备受关注，然而，由于其活性适中，它们很少在实际的工业电解槽中有效运行。在密度泛函理论的指导下，阳离子空位和掺杂剂的相互作用可以操纵 d 带中心，从而获得含氧中间体和超低电位的近最佳结合能。该原理通过催化原位变化合成实验实现，更具体地说，从高熵 Co 原位浸出 Mo，Mo 共掺杂 NiFe 氢氧化物前体形成 Co 掺杂剂和阳离子空位共存的 NiFe 羟基氧化物。Operando 电化学光谱揭示双阳离子缺陷促进金属位点更容易氧化转变，-2。此外，双调节 NiFe 羟基氧化物电极在实际工业电解槽中可在 8 A 下稳定运行，超低能耗约为 4.6 kWh m −3 H 2，验证了实验室构建的新型催化剂实现工业化的可行性。
更新日期：2023-01-15
中文翻译：
用于超低能耗工业水分解电解槽的双阳离子缺陷共含 NiFe 羟基氧化物的原位重构
镍-铁析氧催化剂作为贵金属的替代品一直备受关注，然而，由于其活性适中，它们很少在实际的工业电解槽中有效运行。在密度泛函理论的指导下，阳离子空位和掺杂剂的相互作用可以操纵 d 带中心，从而获得含氧中间体和超低电位的近最佳结合能。该原理通过催化原位变化合成实验实现，更具体地说，从高熵 Co 原位浸出 Mo，Mo 共掺杂 NiFe 氢氧化物前体形成 Co 掺杂剂和阳离子空位共存的 NiFe 羟基氧化物。Operando 电化学光谱揭示双阳离子缺陷促进金属位点更容易氧化转变，-2。此外，双调节 NiFe 羟基氧化物电极在实际工业电解槽中可在 8 A 下稳定运行，超低能耗约为 4.6 kWh m −3 H 2，验证了实验室构建的新型催化剂实现工业化的可行性。
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