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Surface and interface engineering of CoNi layered double hydroxides for efficient methanol oxidation reaction

机译：CoNi层状双氢氧化物的表面和界面工程可有效进行甲醇氧化反应

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In this report, surface atomic engineering (P doping) and interface molecular engineering (coupling with reduced graphene oxide) were adopted to adjusting the chemical compositions, morphological structure, electronic properties and methanol oxidation reaction (MOR) activity of CoNi layered double hydroxides (CoNi LDHs). Low-electronegative P atom doping can improve the conductivity and induce a synergistic effect to increase MOR activity. Coupling P doped CoNi LDHs (P-CoNi LDHs) with reduced graphene oxide (rGO) to produce composite structures (rGO/P-CoNi LDHs) can impart novel electronic and morphological properties, thereby boosting the MOR activity even further. The P-CoNi LDHs with different morphology and the rGO/P-CoNi LDHs composite were prepared by a cyclic voltammetry (CV) deposition method, which can be directly used as a binder free electrode for MOR. Morphology characterization and electrochemical results indicate that the uniform red-bayberry like P-CoNi LDHs, which were prepared in water solvent, exhibit the highest MOR activity compared with those prepared in alcohol–water component electrolyte, which was 2 times higher than the undoped CoNi LDHs. The introduction of rGO enhance the MOR activity and stability even further, the MOR activity of ball flower like rGO/P-CoNi LDHs was 1.7 times higher than P-CoNi LDHs, the current density retention is 97% after 1000 s at 0.6 V, which is higher than that of P-CoNi LDHs (87%), but the long-term stability still remains to rise. This report may provide a new insight into design and prepare high electrochemical performance LDHs.
机译：在本报告中，采用了表面原子工程（P掺杂）和界面分子工程（与还原的氧化石墨烯偶联）来调节CoNi层状双氢氧化物（CoNi）的化学组成，形态结构，电子性质和甲醇氧化反应（MOR）活性。 LDHs）。低电负P原子掺杂可以提高电导率并产生协同效应，从而提高MOR活性。将P掺杂的CoNi LDHs（P-CoNi LDHs）与氧化石墨烯（rGO）偶联生成复合结构（rGO / P-CoNi LDHs），可以赋予新型的电子和形态学性质，从而进一步提高MOR活性。通过循环伏安法（CV）沉积法制备了形态不同的P-CoNi LDHs和rGO / P-CoNi LDHs复合材料，该方法可直接用作MOR的无粘结剂电极。形态表征和电化学结果表明，与在醇-水组分电解质中制备的相比，在水溶剂中制备的均匀的杨梅样P-CoNi LDHs显示出最高的MOR活性，而在醇-水组分电解质中制备的则为未掺杂的CoNi。 LDHs。 rGO的引入进一步增强了MOR的活性和稳定性，球形花样rGO / P-CoNi LDHs的MOR活性是P-CoNi LDHs的1.7倍，在0.6 V电压下1000 s后，电流密度保持率为97％，高于P-CoNi LDH（87％），但长期稳定性仍然有待提高。该报告可能为设计和制备高电化学性能的LDH提供新的见解。

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