擁有世界級品牌豐田、HONDA等的汽車大國日本，為何還不大力發展電動車？

20-30% well to whell effciency係計用electrolysis去拎hydrogen出來, 但而家有大約50%既hydrogen係用natural gas經high temperature reforming生產

用700度以上既水蒸氣同CH4混合會出carbon monoxide同hydrgen, 再放carbon monoxide混合水會出carbon dioxide 同hydrogen, 個carbon dioide可以當係副產物

Alkaline fuel cell係做到62% 既system efficiency

又係靠排放co2去達到高efficiency 都仲係要同電車差一段距離. 咁一開始搞fuel cell vehicle 為乜.

大型fuel cell系統(e.g. 輪船, 潛艇)可以推到90%以上engine efficiency

做科研就係咁架啦, 一隻科技跑出後面大把廢棄技術

https://www.transportenvironment.org/wp-content/uploads/2021/07/2020_06_TE_comparison_hydrogen_battery_electric_trucks_methodology.pdf

搵到份做BEV同FCEV既拖車比較, 其實做regional同做long haul係兩邊要用唔同車, 長距離用FCEV係有價錢同refuel優勢, 但做市內物流都係用BEV好d

你講緊6成好 9成好都係氫變返能量的efficiency
如果轉返係電車即係90%. (only 10% loss)


呢幅圖已經好客觀咁講左條efficiency點計. 你剩係抽一part黎講.
仲要話9成重要係計埋化學反應的熱力去做(combined heat power). 潛艇/輪船的熱力唔係用黎推郁engine又唔提. 咁你一定啱架,law of conservation of energy麻. 一般汽車冇可能用到呢推熱能推郁架車. 連大型汽車都唔會咁做.

兩幅圖都係BEV 平過FCEV喎

咪話咗用electrolysis拎hydrogen個計法唔啱，要用chemical reforming由natural gas轉hydrogen先係主流做法

有無連登仔可以講下要淘汰油車到底係咩陰謀嚟？而家唔係消費者選擇，係各國政府都代大家揀咗將來唔可以存在油車

人人都係用電解計

"This has been a deliberate choice in order to provide for a level playing field and
compare two technologies which can ensure zero well-to-wheel GHG emissions"
全部計法都係假設100% 0排放+renewable source. 係你先話用natural gas有排放先係正確嘅.

當然現實冇可能100% 零排放+renewable resource. 但係所有FCEV對BEV要用呢個前設先有得比較.

唔係的話FCEV 用natural gas有CO2排放，同埋唔係renewable resource,點計.

有本事同所有做呢d研究的人叫佢地轉用你的"正確做法"