氢氧燃料电池以H2为还原剂，O2为氧化剂，电极为多孔镍，电解

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氢氧燃料电池以H₂为还原剂，O₂为氧化剂，电极为多孔镍，电解液为30％的KOH溶
液，下列有关叙述正确的是（）
①负极反应为4OH^--4e^- =O₂↑+2H₂O
②负极反应H₂+2OH^- - 2e^- =2H₂O
③工作时正极区pH升高，负极区pH降低
④工作时溶液中阴离子移向正极

A．③④

B．②③

C．②④

D．①④

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