Ni(OH)₂ nanosheet arrays are in situ prepared on Ni foam through very straightforward ultrasonication in HCl solution and the following rinsing and drying procedures. Value-added formate and hydrogen could be co-produced by selective oxidation of methanol without carbon dioxide emissions and water reduction over Ni(OH)₂ nanosheet arrays bifunctional electrocatalysts. Energy depletion for hydrogen evolution from water could be reduced by integrating with selective methanol oxidation rather than oxygen evolution. The prepared Ni(OH)₂ nanosheet arrays exhibits high activity for selective methanol oxidation in alkaline methanol-water solution. It gives a low potential of only 1.36 V (vs. reversible hydrogen electrode) to drive the current density of 100 mA cm⁻². The faradaic efficiencies of formate are approximately 100% with the current densities from 10 mA cm⁻² to 100 mA cm⁻². Moreover, it is easy to separate the anodic and cathodic products without help of any membrane, which greatly simplifies the electrolysis system.

通过在HCl溶液中非常直接的超声处理以及以下漂洗和干燥程序，在Ni泡沫上原位制备了Ni（OH）₂纳米片阵列。通过在Ni（OH）₂纳米片阵列双功能电催化剂上进行甲醇的选择性氧化而没有二氧化碳的排放和水的减少，可以共同生产增值的甲酸和氢。通过与选择性甲醇氧化而不是氧气释放相结合，可以减少从水中释放氢的能量消耗。制备的Ni（OH）₂纳米片阵列对碱性甲醇水溶液中的选择性甲醇氧化表现出高活性。它的低电位仅为1.36 V（vs。可逆氢电极）来驱动100 mA cm ^-2的电流密度。甲酸的法拉第效率在电流密度为10 mA cm ^-2至100 mA cm ^-2时约为100％。此外，无需任何膜即可轻松分离阳极和阴极产物，从而大大简化了电解系统。