当前位置:首页>复习资料>【2026版化学高考步步高大二轮专题复习讲义广东专用版专题四微点突破1原电池工作原理及燃料电池

【2026版化学高考步步高大二轮专题复习讲义广东专用版专题四微点突破1原电池工作原理及燃料电池

  • 2026-03-21 02:33:28
【2026版化学高考步步高大二轮专题复习讲义广东专用版专题四微点突破1原电池工作原理及燃料电池

微点突破1 原电池工作原理及燃料电池

1.原电池的工作原理

2.燃料电池

以CH3OH燃料电池为例,体会不同介质对电极反应的影响。

电池类型

导电介质

反应式

酸性燃料电池

H+

总反应:2CH3OH+3O2===2CO2+4H2O

正极

O2+4e-+4H+===2H2O

负极

CH3OH-6e-+H2O===CO2+6H+

碱性燃料电池

OH-

总反应:2CH3OH+3O2+4OH-===2C+6H2O

正极

O2+4e-+2H2O===4OH-

负极

CH3OH-6e-+8OH-===C+6H2O

熔融碳酸盐燃料电池

C

总反应:2CH3OH+3O2===2CO2+4H2O

正极

O2+4e-+2CO2===2C

负极

CH3OH-6e-+3C===4CO2+2H2O

固态氧化物燃料电池

O2-

总反应:2CH3OH+3O2===2CO2+4H2O

正极

O2+4e-===2O2-

负极

CH3OH-6e-+3O2-===CO2+2H2O

质子交换膜燃料电池

H+

总反应:2CH3OH+3O2===2CO2+4H2O

正极

O2+4e-+4H+===2H2O

负极

CH3OH-6e-+H2O===CO2+6H+

1.(2025·广东,16)某理论研究认为:燃料电池(图b)的电极上所发生反应的催化机理示意图分别如图a和图c,其中O2获得第一个电子的过程最慢。由此可知,理论上(  )

A.负极反应的催化剂是

B.图a中,过程的活化能一定最低

C.电池工作过程中,负极室的溶液质量保持不变

D.相同时间内,电极和电极上的催化循环完成次数相同

答案 C

解析由图a知,电极发生的反应为O2+4H++4e-===2H2O,故电极作正极,由图c知,电极发生的反应为H2-2e-===2H+,故电极作负极。结合上述分析知,正极反应的催化剂是ⅰ,A错误;由O2获得第一个电子的过程最慢知,过程的活化能最高,B错误;H2进入负极失电子生成H+,为保持溶液呈电中性,H+通过质子交换膜向正极迁移,故负极室的溶液质量保持不变,C正确;根据正、负极的电极反应式及得失电子守恒知,相同时间内电极上催化循环完成次数为电极上的2倍,D错误。

2.(2023·广东,6)负载有Pt和Ag的活性炭,可选择性去除Cl-实现废酸的纯化,其工作原理如图。下列说法正确的是(  )

A.Ag作原电池正极

B.电子由Ag经活性炭流向Pt

C.Pt表面发生的电极反应:O2+2H2O+4e-===4OH-

D.每消耗标准状况下11.2 L的O2,最多去除1 mol Cl-

答案 B

解析由题图分析可知,Cl-Ag极失去电子发生氧化反应,Ag为负极,A错误;电子由负极Ag经活性炭流向正极Pt,B正确;溶液为酸性,故Pt表面发生的电极反应为O2+4H++4e-===2H2O,C错误;每消耗标准状况下11.2LO2,转移2mol电子,最多去除2molCl-,D错误。

3.(2021·广东,9)火星大气中含有大量CO2,一种有CO2参加反应的新型全固态电池有望为火星探测器供电。该电池以金属钠为负极,碳纳米管为正极,放电时(  )

A.负极上发生还原反应

B.CO2在正极上得电子

C.阳离子由正极移向负极

D.将电能转化为化学能

答案 B

解析根据题干信息可知,放电时总反应为4Na+3CO2===2Na2CO3+C。放电时负极上Na失去电子发生氧化反应生成Na+,故A错误;放电时正极上CO2得到电子生成C,故B正确;放电时阳离子移向正极,故C错误;放电时该装置为原电池,将化学能转化为电能,故D错误。

通过网盘分享的文件:word讲义【更新联系:lymsummers】等2个文件

链接: https://pan.baidu.com/s/1VcNxeHXgbJfoVMtA3SnQAg?pwd=4321 提取码: 4321 

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  1. CONNECT:[ UseTime:0.000862s ] mysql:host=127.0.0.1;port=3306;dbname=i_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001347s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.005608s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001330s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001466s ]
  6. SELECT * FROM `set` [ RunTime:0.001764s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001457s ]
  8. SELECT * FROM `article` WHERE `id` = 462624 LIMIT 1 [ RunTime:0.003190s ]
  9. UPDATE `article` SET `lasttime` = 1774759037 WHERE `id` = 462624 [ RunTime:0.003384s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.001003s ]
  11. SELECT * FROM `article` WHERE `id` < 462624 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001241s ]
  12. SELECT * FROM `article` WHERE `id` > 462624 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002895s ]
  13. SELECT * FROM `article` WHERE `id` < 462624 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.008436s ]
  14. SELECT * FROM `article` WHERE `id` < 462624 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001861s ]
  15. SELECT * FROM `article` WHERE `id` < 462624 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001892s ]
0.210293s